Construction Archives

April 18, 2025

The Unique Challenges of Demolition in High-Traffic Areas Like London’s High Streets

Demolition in a city like London is anything but straightforward—especially in vibrant high street
locations. These areas are alive with daily foot traffic, busy shops, restaurants, heritage buildings, public
transport access points, and residential spaces. Every demolition project in such zones must be
approached with a high level of planning, care, and precision. That’s why hiring high street demolition
contractors in London with relevant experience is not just recommended—it’s essential.

One of the key concerns is public safety. In London’s tightly packed commercial areas, demolition teams
must implement rigorous safety protocols to protect pedestrians, workers, and nearby properties. This
includes secure hoarding, footpath diversions, controlled dismantling techniques, and constant on-site
supervision. A single oversight can result in delays, penalties, or even legal complications.

Equally important is minimising disruption to businesses and traffic. High streets in London are
economic lifelines for many local retailers and eateries. Unplanned road closures, noise pollution, or
blocked access can lead to financial losses and public complaints. Experienced contractors work closely
with local councils, Transport for London (TfL), and business owners to maintain clear communication
and ensure that project timelines align with community needs.

Waste removal and dust management pose additional logistical hurdles. In such populated areas, it's
vital to contain airborne particles and remove debris in a way that doesn’t interrupt city life. Techniques
such as wet cutting, dust curtains, and well-timed waste disposal play a big role in keeping the
surrounding environment clean and safe.

Moreover, regulatory compliance in London is strict. Demolition contractors must secure the right
planning permissions, adhere to Building Control regulations, perform environmental impact
assessments, and follow guidelines from authorities like the London Borough Council and the Health and
Safety Executive (HSE). Only contractors with a strong knowledge of local law and extensive
documentation experience can meet these demands effectively.

Access issues are another unique challenge. London high streets often have narrow roads and limited
space, which may restrict the movement of large machinery. This calls for the use of compact demolition
equipment, scaffolding-based dismantling, or even manual deconstruction to complete the job without
disturbing surrounding infrastructure.
Ultimately, the success of a high street demolition project in London hinges on professionalism,
precision, and collaboration. That’s why businesses and developers alike turn to specialist high street
demolition contractors in London—professionals who understand how to balance safety, efficiency, and
minimal disruption in even the most demanding locations.

Final Words about Author
In a bustling metropolis like London, high street demolition demands more than just expertise—it
requires a deep understanding of the local environment, strict safety regulations, and careful

community coordination. For projects where precision and reputation matter, rely on trusted
professionals like CSMANLTD to get the job done right, from start to finish.

CSMANLTDConstruction, Industrial, Main

March 26, 2025

The Vital Role of Groundworks Contractors: A Comprehensive Guide

When starting any construction project, the foundation is the most crucial element—both literally and figuratively. This is where groundworks contractors come into play. Their role involves preparing the site, laying the foundation, and ensuring the structural integrity of the entire build. Whether you’re planning a new home, a commercial building, or a basement extension, hiring experienced groundworks contractors in London is essential for a successful and safe construction project.

In this article, CSMANLTD explores the key responsibilities of groundworks contractors, the services they offer, and why choosing the right team is vital for your project’s success.

What Are Groundworks Contractors?

Groundworks contractors are specialized construction professionals responsible for preparing the land before building begins. Their work sets the foundation for all subsequent construction activities, making their role fundamental to the project’s stability and longevity.

They handle tasks such as site clearance, excavation, drainage, foundation laying, and utility connections. In London, where many properties require deep excavation and robust drainage solutions, experienced groundworks contractors play a critical role in preventing future structural issues.

Key Responsibilities of Groundworks Contractors in London

Site Preparation and Clearance

Before any construction begins, groundworks contractors clear the site of debris, vegetation, and existing structures. This process ensures the land is safe, accessible, and ready for building.

Land grading: They level the ground to create a stable, even surface.
Demolition and waste removal: Existing structures or obstructions are safely demolished and disposed of, adhering to local regulations.

Excavation and Earthworks

Excavation is a major component of groundworks. Contractors dig out the area to create space for basements, foundations, or drainage systems.

Deep excavations: In London, where basement extensions and multi-level developments are common, precise and safe excavation is essential.
Soil stabilization: They may reinforce or treat the soil to prevent future movement, ensuring the foundation remains stable.

Laying Foundations

Groundworks contractors are responsible for laying robust foundations that support the structure. This includes:

Strip and trench foundations: Common for residential properties, providing support to load-bearing walls.
Raft foundations: Ideal for areas with poor soil conditions, offering a larger base to distribute weight.
Piling: Used in areas with unstable or clay-heavy soil, providing deep-rooted stability.

Drainage and Water Management

Proper drainage is vital in London, where heavy rainfall can cause flooding or waterlogging. Groundworks contractors install effective drainage systems to prevent water accumulation and structural damage.

Drainage channels and soakaways: These direct excess water away from the foundation.
Waterproofing measures: Essential for basement conversions to prevent dampness and leaks.

Utility Connections

Groundworks teams are responsible for connecting essential utilities, including water, gas, and electricity. This involves:

Trenching and ducting: Digging trenches for utility pipes and cables.
Backfilling and compaction: Covering and stabilizing the trenches once utilities are installed.

Why Hire Experienced Groundworks Contractors in London?

Expertise in Local Regulations and Soil Conditions

London has unique soil compositions and strict construction regulations. Experienced groundworks contractors in London understand the complexities of working with different soil types, such as clay-heavy or sandy ground. They also ensure full compliance with building regulations and planning permissions.

Minimizing Structural Risks

Poorly executed groundworks can lead to costly structural issues in the future, such as subsidence, flooding, or foundation failure. Skilled contractors use advanced techniques and high-quality materials to create stable, long-lasting foundations.

Ensuring Project Efficiency

Professional groundworks contractors streamline the entire process by using the latest machinery and technology. Their efficiency reduces project delays and ensures that subsequent construction phases proceed smoothly.

How to Choose the Right Groundworks Contractors in London

Verify Licensing and Insurance

Ensure the contractor is fully licensed, insured, and compliant with London’s building regulations. This protects you from liability and ensures the work meets safety standards.

Check Experience and Portfolio

Review the contractor’s past projects, particularly in London. Experience with local ground conditions and drainage requirements is essential for effective groundwork.

Request Detailed Quotes

Get comprehensive quotes covering all aspects of the project, including site clearance, excavation, foundation work, and utility connections. This ensures transparency and helps you compare pricing accurately.

Read Reviews and Testimonials

Check customer reviews and testimonials to gauge the contractor’s reliability, quality of work, and professionalism.

Final Thoughts –

By choosing CSMANLTD, you’ll benefit from a team of experienced professionals dedicated to delivering high-quality groundwork services. With their expertise, you can safeguard your investment and ensure a smooth, efficient construction process, free from costly structural issues in the future.

CSMANLTDConstruction

March 19, 2025

Major Critical Questions to Ask Before Starting Your Basement Conversion

A basement conversion is an excellent way to maximize your home’s space and boost its value. Whether you’re transforming it into a guest suite, home office, entertainment area, or rental unit, it’s essential to approach the project with careful planning. Asking the right questions before you begin will help you avoid costly mistakes and ensure a smooth, successful transformation.

Based on insights from CSMANLTD, here are the major critical questions you should consider before starting your basement conversion.

Is My Basement Suitable for Conversion?

Before diving into design ideas, you need to determine whether your basement is structurally fit for conversion. Not all basements are suitable for remodeling, and ignoring this step can lead to expensive issues down the road.

First, check the ceiling height. Most local building regulations require a minimum ceiling height of 7 feet for habitable living spaces. If your basement falls short, you may need to lower the floor or raise the ceiling—both of which are costly and complex processes.

Next, inspect for water damage or moisture issues. Basements are prone to dampness, which can lead to mold growth and foundation problems. Look for visible cracks, water stains, or a musty smell. If you notice these signs, you’ll need to invest in proper waterproofing before converting the space.

Tip: Hire a structural engineer or contractor to assess the space. They can identify potential issues and confirm whether your basement is suitable for conversion.

Do I Need Planning Permission or Permits?

Many homeowners assume that basement conversions don’t require permits—but this is a misconception. Depending on your location and the scale of the project, you may need planning permission or specific permits for electrical work, plumbing, and structural changes.

For instance, if you’re adding new windows, doors, or plumbing lines, you’ll likely need to file for a permit. Additionally, building regulations often mandate emergency exits (egress windows) and proper ventilation for basement living spaces.

Failing to obtain the necessary permits can lead to legal issues, fines, or the need to undo the work. To avoid this, consult with your local building authority or hire a contractor familiar with the regulations in your area.

Tip: Even if you’re planning a simple renovation, it’s worth double-checking permit requirements to avoid complications later.

How Will I Handle Waterproofing and Drainage?

Waterproofing is one of the most critical aspects of a basement conversion. Even if your basement appears dry, hidden moisture issues can emerge over time, leading to mold growth and structural damage.

To safeguard your investment, consider installing a sump pump to prevent flooding. If you live in an area with frequent rain or a high water table, installing a sump pump can significantly reduce the risk of basement flooding. Additionally, adding a drainage system around the foundation can direct water away from your home.

For extra protection, apply waterproof sealant to the basement walls and floors. This creates a moisture barrier, reducing the risk of dampness. If you have serious water intrusion problems, you may need external waterproofing, which involves sealing the outer foundation walls.

Tip: Don’t cut corners on waterproofing—it’s a long-term safeguard that prevents expensive repairs in the future.

How Will I Maximize Natural Light and Ventilation?

Basements often suffer from poor lighting and ventilation, making them feel dark and stuffy. To create a bright and welcoming space, you’ll need to get creative with both natural and artificial lighting.

If possible, install larger egress windows or window wells. Not only do these allow more natural light to enter, but they also provide a safe emergency exit. Additionally, consider using light-colored paints, reflective surfaces, and mirrors to enhance the brightness of the room.

For artificial lighting, combine recessed ceiling lights with floor and wall lamps to create layers of illumination. Adding ventilation systems or dehumidifiers will help regulate air quality and prevent dampness.

What Type of Insulation and Heating Will I Need?

Basements are naturally colder than the rest of the house, so insulation and heating are essential for comfort and energy efficiency. Proper insulation prevents heat loss and reduces your energy bills.

For walls, use foam board or spray foam insulation, which resists moisture and offers excellent thermal protection. When insulating floors, consider rigid foam insulation beneath your flooring material.

To keep the basement warm, you can:

Extend your existing HVAC system.
Install baseboard or radiant heaters.
Use underfloor heating for added comfort.

Tip: Investing in quality insulation upfront pays off in long-term energy savings.

How Will I Ensure Proper Soundproofing?

If you plan to use your basement as a home theater, music room, or rental space, soundproofing is a must. It prevents noise from traveling between floors, ensuring privacy and reducing disturbances.

To soundproof effectively:

Add acoustic insulation between the basement ceiling and the floor above.
Use soundproof drywall or mass-loaded vinyl on the walls.
Install thick carpeting or rugs to absorb sound.

Tip: Soundproofing enhances both privacy and the overall comfort of your basement conversion.

Do I Need an Emergency Exit?

For safety and compliance, an emergency exit is essential in any habitable basement conversion. Most building regulations require at least one egress window or door.

An egress window must be:

Large enough for a person to escape through (typically 20×24 inches minimum).
Easily accessible without special tools.

Even if your local regulations don’t mandate an egress, it’s still a smart addition for safety and resale value.

Tip: Egress windows also bring in more natural light, making the basement feel less confined.

What Is My Budget and Timeline?

Setting a realistic budget and timeline is key to avoiding stress and financial surprises. Basement conversions typically range from $20,000 to $75,000, depending on the complexity and size of the project.

When creating your budget, factor in:

Materials and labor costs.
Permits and inspections.
Unexpected expenses (allocate 10-15% extra for contingencies).

For the timeline, basement conversions often take 4 to 12 weeks, depending on the project’s scope.

Tip: Be prepared for minor delays—unforeseen issues, such as plumbing or structural surprises, can extend the timeline.

Should I Hire Professionals or DIY?

While DIY projects can save money, basement conversions are often too complex for most homeowners. Improper plumbing, electrical work, or structural modifications can lead to costly repairs later.

Hiring licensed professionals ensures:

The project meets building regulations and safety standards.
You avoid costly mistakes.
The quality of work adds value to your home.

Tip: Even if you handle some cosmetic tasks yourself, hire professionals for the structural and technical aspects.

Key Takeaway: Maximize Your Basement’s Potential

A basement conversion can be a game-changer—adding both space and value to your home. By addressing these critical questions upfront, you’ll create a functional, safe, and stylish living area that enhances your lifestyle and boosts your property’s long-term value.

CSMANLTDBasement Construction, Basement design and build, Basement Waterproofing, Construction

Basement waterproofing cavity wall drain

April 19, 2024

Basement Waterproofing Basement Construction London

Basement damp is a serious problem that can cause structural damage, health issues due to mould, and loss of usable space. It is important to treat it promptly to prevent further damage and costly repair bills.

One of the most effective solutions is internal waterproofing, which can be performed on an existing property or during new construction. This process is known as tanking.

Basement waterproofing Membrane – Cavity Wall Drain

One way to help keep water out of basement walls is with a dimple mat, or delta membrane. This product is a sheet of high-density polyethylene combining recycled and virgin material studded with 10mm tall dimples that can be applied to foundation walls. It creates an air gap that eliminates hydrostatic pressure against the wall and allows water to run down the concrete footing and away from the wall.

Another popular option for waterproofing a basement is the use of a cavity drainage system. This system uses a series of internally or externally dimpled membranes, as well as perimeter drainage channels and hidden sump pumps to control groundwater ingress and evacuate water to a drainage point. This method of waterproofing is perfect for new build construction, as well as existing renovations.

The most reliable basement waterproofing systems include a combination of different methods, tailored to specific conditions and site requirements. Professional waterproofing contractors can assess a property and recommend the best solution for its unique environment.

CSMANLTD is a professional contractor who can provide all your basement waterproofing needs using a combination of TYP A and Type C methods – a combination of waterproofing concrete and membrane cavity wall drain system with a sump pump.

Basement WaterProofing Cavity Drain Systems

Basement waterproofing cavity drain: A cavity drain system, also known as a Type C waterproofing system, creates a controlled drainage path for water that penetrates the foundation walls or floor. Here’s a breakdown of its key components:

Drainage Membrane: A high-quality, water-resistant membrane is installed on the interior walls and floor of your basement. This membrane features a dimpled or studded pattern, creating a cavity between the membrane and the foundation.
Drain Channels: A network of channels is installed at the base of the foundation walls, collecting any water that seeps through the walls or floor.
Sump Pump: A sump pump is placed within a pit at the lowest point in the drainage system. This pump automatically activates when the water level reaches a certain point, efficiently pumping the collected water away from your basement, typically discharging it to a drain line or exterior drainage system.

Benefits of Cavity Drain Systems

Proactive Water Management: Unlike traditional waterproofing methods that simply act as a barrier, cavity drain systems actively collect and remove water before it can cause damage.
Long-Term Solution: These systems are built to last, offering a durable and reliable solution for long-term basement dryness.
Adaptability: Cavity drain systems can be installed in various basements, regardless of the foundation type (concrete, block, etc.).
Reduced Maintenance: Once installed, these systems require minimal maintenance, needing only periodic inspection and cleaning of the sump pump.
Improved Basement Environment: By eliminating moisture, cavity drain systems help prevent mold growth and create a healthier, more comfortable basement space.

Investing in a Dry Basement

Basement waterproofing with a cavity drain system is a wise investment that protects your home’s structural integrity and promotes a healthier living environment. By actively managing water intrusion, these systems offer peace of mind and safeguard your basement for years to come. If you’re facing basement moisture problems, consider consulting a foundation waterproofing professional to discuss the suitability of a cavity drain system for your specific needs.

Basement waterproofing London

Basement waterproofing London: Any structure below ground level is exposed to water pressure from all sides – and left untreated, this can cause surface dampness on walls and floors as well as potential flooding. Fortunately, there are many ways to prevent water ingress and protect your property from damp and other damage. The most effective way is to waterproof your basement or cellar at the time of construction.

A basement that is not properly waterproofed can become a damp, insecure area that is difficult to use. It can also be the source of black mould that not only looks unsightly but can cause health problems if inhaled. This is because black mould spores are known to cause asthma and other respiratory conditions in some people.

The best option is to get a basement tanking system in place during the building process, as this is an in-situ solution that is much more cost effective than retrofitting it to an existing property. The system involves installing internal membranes and a system of drainage channels and pumps, which manages any water ingress into the basement and diverts it away from living areas. This is often referred to as Cavity Drain Membrane system.

Final Words

Most homeowners understand the importance of waterproofing their basement. They know that dampness can damage their valuables and cause a multitude of health problems. But they might not realise the impact that it can have on their home’s value. Homes that have been damaged by water ingress tend to sell for 25% less than those that are dry.

This is because damp leads to mould and mildew that not only makes your property unsightly but also dangerous for your health. Mould and mildew spores can be inhaled and can cause respiratory problems. It is also hard on masonry and is difficult to clean. So, if you’ve got any signs of dampness or flooding, it is essential that you call in the experts to get it fixed as soon as possible.

There are various methods of basement waterproofing, but the most popular is called tanking. This is done from the outside of the property and involves a membrane that wraps around the walls before concrete is poured, creating a sort of water-tight ‘tank’. This method is very effective but is more suitable for new constructions and cannot be used in older buildings.

Another method of basement waterproofing is a pump-out system. These are more suitable for existing properties and involve a series of drains that are connected to a pump to remove the excess water. This method is more cost-effective than tanking, but it is not as effective. Lastly, there are injection systems that can be used to fix cracks and leaks. These can include epoxy crack injections and hydrophilic polyurethane injections.

CSMANLTD0 commentBasement Construction, Basement Waterproofing, Construction

August 25, 2023

Alternative segment lift for HS2’s Colne Valley Viaduct minimises local disruption

Construction of High Speed 2’s (HS2’s) 3.4km long Colne Valley Viaduct has reached a major milestone with a key 40m long span lifted into place over a local road during a three week closure of the route.

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CSMANLTD0 commentConstruction

August 25, 2023

Marathon’ bridge build completed on HS2

Contractors on HS2 have completed a ‘marathon’ bridge build at Streethay near Lichfield involving 18 specialist construction companies.

Work involved excavating 14,000 tonnes of earth, building a 140 metre retaining wall and moving a 2,600 tonne bridge deck 130 metres into place under the South Staffordshire freight railway.

The work was carried out during a 10 week blockade. It was completed by HS2’s civils contractor in the West Midlands, Balfour Beatty VINCI, and designers Mott MacDonald as part of a Design Joint Venture with SYSTRA (MMSDJV), together with teams from 18 specialist supply chain companies.

At the end of July, the 2,600 tonne bridge deck, which had been cast on land adjacent to the railway was moved 130 metres into position using self-propelled modular transporters.

Since then, each side of the bridge was backfilled, the rail tracks were reinstated, with the railway line was successfully handed back to Network Rail last week and now reopened.

The 25 metres long and 18 metres wide Streethay overbridge sits within HS2’s Streethay cutting and will enable HS2 trains to travel under the existing railway between Birmingham and Crewe.

Through design development, Mott MacDonald engineers were able to reduce the total length of wall structures for the railway at Streethay from 1.6 kilometres to 420 metres, meaning 80% less concrete is needed – saving around 420,000 tonnes of carbon, supporting HS2’s ambition to cut carbon on the project.

The Streethay bridge sits on top of the larger 420 metre long retaining wall structure which will have two additional bridges crossing it – the south bound A38 slip road bridge, and the Rykneld Bridge which carries the A38 north bound slip road and the A38 north and south bound carriageway.

At its peak, over 150 people worked on the complex construction operation, with teams from 18 specialist companies, delivering design, surveys, piling works, bridge build, concrete pouring, crane operations, reinforcements, modular transportation, track and systems removal and reinstatement.

The work was delivered in parallel to the construction of the nearby Fulfen Wood bridge, which involved moving a giant 6,200 tonne single span structure under the West Coast Main Line – the UK’s heaviest drive to install an intersection bridge.

David Millar, Rail Interface Manager at Balfour Beatty VINCI said: “The successful delivery of this complex and challenging piece of engineering near Lichfield is another proud moment for Balfour Beatty VINCI on the HS2 project.

“It’s only been possible thanks to the skill, dedication and support shown by the project team over the past few years, including our supply chain. Together, we’ve had to work around existing transport infrastructure, including the South Staffordshire freight railway and the A38, making this achievement even more rewarding.”

Prior to the railway blockade, retaining walls were installed on either side of the railway, enabling the areas to be excavated. The bridge deck was constructed on land adjacent to the existing railway, 130 metres from its final position.

Once the railway was closed to freight trains, the track and embankment were removed. Bachy Soletanche Balfour Beatty Ground Engineering joint venture then installed an additional 76 secant piles measuring 1.3 metres diameter and 30 metres deep, linking to the piles they installed prior to the blockade, to create two retaining walls which act as the walls for the bridge.

A concrete capping beam was installed over the retaining walls, then the bridge was moved into place using self-propelled modular transporters with 344 wheels. Concrete was poured to attach the deck to the capping beam, the embankment was back filled using 2,500 tonnes of structural backfill, on either side of the bridge, before the railway line was reinstated.

The 18 companies which delivered the project were:

J. Murphy & Sons constructed the bridge deck and the concrete elements during the blockade
Bachy Soletanche Balfour Beatty Ground Engineering JV (SB3) undertook all piling works, both before and during the blockade
The bridge parapets were made by Explore precast
Podtrak and RSS Infrastructure delivered rail systems work
Balfour Beatty VINCI delivered earthworks
Pile break-down was by Pile Breaking Systems UK Ltd
Trackway supplied by TPA
Jacking the structure and modular transportation by Mammoet UK
Survey works track monitoring by Aecom
Crane supply by King Lifting supported by BBV lifting teams
Concrete provided by CEMEX
Reinforcement by ROM – specialist reinforcement manufacturers
Temporary works by RMD
Permanent works design by Design JV (Mott Macdonald and Systra)
Temporary works design by Taylor Woodrow

CSMANLTD0 commentConstruction

August 25, 2023

Innovation Showcase | Track-free travelling formwork drives pace of HS2 green tunnel work

Innovative moving formwork is helping to speed construction of High Speed 2’s Copthall Tunnel in north west London.

Copthall Tunnel is one of five green tunnels being built along Phase 1 of High Speed 2 (HS2) between London and Birmingham.

Situated between HS2’s Northolt Tunnel and the Colne Valley Viaduct, the 880m long reinforced concrete Copthall Tunnel will blend into
its natural surroundings, covered with trees and plants once construction is complete.

The project is being delivered by Skanska Costain Strabag Joint Venture, with Kilnbridge appointed to complete the reinforced concrete works. Making the tunnel a concrete reality has been possible with custom formwork travellers engineered by Peri’s specialist infrastructure team.

As the travellers were expected to be in use over an 18 month period, the main drivers influencing their design were durability, productivity and sustainability.

To support the specified construction sequence, Peri’s engineers designed two carriages which enabled the site team to cast the walls and roof slab simultaneously, ultimately accelerating the programme. These carriages comprised four units in total, two for the wall and two for the roof.

The carriages are designed to reduce material, manual labour and craneage as the main operations such as striking, positioning and travelling are completed hydraulically.

The wall forms are built from special modular steel panels. Each set is designed to build 20m long and 7.5m high walls.

The panels are suspended from a carriage which is designed using off-the-shelf components from Peri’s Variokit range, with some specially fabricated connection parts. Variokit rails provided additional support for the formwork, reducing through ties to less than half the quantity required in a traditional panel system.

“We’ve been able to save around five days per wall in comparison to traditional formwork systems, as we can complete installation and prepare the system for concreting in one day,” says Kilnbridge project manager Teresa Martin.

The internal and external formwork on the wall carriages raise, lower and retract hydraulically, eliminating crane use and reducing labour requirements and cycle time by over 80%.

The roof carriage is built from a mix of special and standard components. In addition to fully supporting the rebar and concrete load, it features hydraulic cylinders which enable the traveller to be lowered, collapsed, pushed under the carriage in front and repositioned to allow rebar fixing and pouring operations to be concurrent.

Peri senior sales engineer Dan Biggs says: “Special steel formwork was ideal for this project as the forms can be reused up to 30 times, so there is an obvious material saving advantage in addition to time savings, as panels do not need refacing, unlike a
plywood faced system.”

Following on from the installation of the roof traveller, the next steps will be progressing the tunnel so all three elements – base slab, tunnel walls and roof slab progress concurrently without conflicting. Tunnel construction is expected to be completed by February 2025.

CSMANLTD0 commentConstruction

August 25, 2023

Meet the company using discarded oyster shells to cut energy costs and keep France’s buildings cool

Cool Roof France has found an innovative way to use the 130,000 tonnes of waste oysters produced every year in France.

As heat waves continue to scorch Europe, many of us are looking for cheap and innovative ways to keep our homes or workplaces cool.

While air conditioning often proves effective, its environmental cost contributes further to the climate crisis.

So what if we look into the past and to other parts of the world for inspiration and startpainting our roofs white?

“This technology is just pretty old actually, but this is quite innovative to make it so technical,” says Julien Martin Cocher, deputy CEO of Cool Roof France.

But does having a white roof really make a building cooler?

What is oyster shell roof paint?

Cool Roof France (CRF) is on a mission toreduce the ambient temperature inside buildingsin a sustainable and cost effective way.

Traditional paint is made up of calcium, solvent and water.

In France, more than 130,000 tonnes of oyster shells are thrown away every year. CRF takes a few tonnes of thiswasteand uses the outer part of the shell – which is made from calcium – to replace the traditional calcium in its paint.

“The oyster was at the beginning just to use a waste that we are finding quite easily in the west part of France and to replace this calcium that we are usually finding [in paint],” Julien explains.

Its innovative team of scientists soon discovered that the oyster shell maximises the paint’s performance and makes it more durable.

Can white paint make my home cooler?

CRF’s oyster-enriched, thermo-reflective roof paint is applied in three layers. The first two layers make it a durable product which will last for around 20 years.

By adding the third layer, the paint is able to reflect 90 per cent of the sun’s rays away from a building.

This results in an average temperature reduction of six to seven degrees Celsius.

“Usually companies areusing ACand when they are using AC, that means that if we are lowering the temperature, we manage toreduce the AC use.

“By reducing the use, we are also dropping down the energy consumption for the AC,” Julien adds.

“So that means, when we are getting minus six, minus seven degrees Celsius we manage to demonstrate that we are getting between30 to 50 per cent less energy consumption, which is huge.”

Cool Roof France has already painted many shop, hospital and office roofs and the results are astounding.

In France, the company has worked closely with the police and government to paint the roof of a sniffer dog handling unit. The ambient temperature of the building was reduced by 10 degrees Celsius.

Last year, schools across Europe wereforced to close because it was too hotfor the children to be inside.

“We shouldn’t fall into this kind of situation,” Julien says.

“We have 1 billion AC (air conditioning units) today. We estimate that we may get 5 billion in 2050.AC is a solution that is making some cold inside the building by making some hot outside.So we are all impacted by this kind of crazy solution.

“Today with a white paint, this is super smart and so easy to implement.”

Can I paint my own roof white with Cool Roof France?

Currently, Cool Roof France mainly works with businesses, schools and hospitals to reduce the temperature inside buildings filled with hundreds of people.

Its staff are able to paint the roof of an office building much quicker than the same area across multiple homes.

By painting many large roof areas white in an urban environment it helps to fight against theurban heat island effect. This is whencities suffer from much higher temperaturesas the heat is contained by tall buildings and large amounts of asphalt. Cooling down bigger buildings can help reduce the overall temperature of a city or town.

But fear not, if you do like the idea of a white roof for your home (and have a love of DIY), CRF also sells its thermo-reflective roof paint via its site.

Using white paint for good around the world

With every building they paint, Cool Roof France monitors and evaluates its product’s performance. It is constantly innovating when it comes to paint.

The company also uses 10 per cent of its profits to help fund projects to support people living in heat vulnerable areas.

“Last year we went to Senegal, painting 30,000 square metres of buildings, schools, hospitals, individual houses and just to help people because this is part of our DNA,” says Julien.

“We just want to make sure that we are going beyond because today we are all suffering from thesedaily heatwaves.”

Watch the video above to learn more about this innovative roof paint.

CSMANLTD0 commentConstruction

August 25, 2023

FIRST LOOK FCBS completes makeover of world’s first iron-framed building

Feilden Clegg Bradley Studios has adapted the Grade I-listed Shrewsbury Flaxmill Maltings into a £28 million social enterprise hub for Historic England after first being engaged on the project nearly 20 years ago

The Grade I-listed Shrewsbury Flaxmill Maltings was built in 1797 and was the world’s first iron-framed building, a technology developed to give better fire protection.

For nearly a century the site operated as a steam-powered flax mill and was later converted into maltings. During the Second World War the site was used as a temporary military barracks. Following the closure of the maltings in 1987, the future of the site was uncertain before it was bought by Historic England in 2005.

Historic England made it a flagship heritage regeneration project and the former maltings has been gently adapted into a workspace, leisure destination and social enterprise hub.

The project has also introduced a new ground-floor teaching space, which tells the story of the mill’s role in the industrial revolution and world architecture, alongside a café. Above, four floors of offices provide workspaces for 360 people, circulation and meeting space within the former kiln for commercial tenants, as well as access for visitor tours to the restored Jubilee Tower.

The cast iron frame, which had suffered cracking due to settlement and was under-engineered to today’s standards, has been reinforced by strengthening the masonry around the existing iron to enable it to act as an alternative load path in the event of failure. The entire frame has been put back to work through the addition of a hidden steel grillage and six new columns at ground floor level.

Putting the building back to work required comprehensive repairs to the existing fabric and insertion of new core facilities. A light-touch conservation approach was employed to preserve its character.

The pyramidal Malt Kiln, which has many level changes internally, has been converted into a new entrance. This has been left unheated to reduce energy use.

A total of 110 former windows have been reopened. This move, and refitting with new metal windows with high-performance solar glazing, reintroduces natural light and ventilation.

Thermal upgrading of the existing solid masonry walls was researched through on-site trials and hygrothermal modelling. As a result, wood fibre insulation was used to reduce heating costs.

The name ‘Shrewsbury Flaxmill Maltings’, painted in 2m-high lettering across 50m of the principal elevation, was chosen by the community following local consultations.

A heritage skills programme was delivered during the construction works, using the site as a space for learning.

Feilden Clegg Bradley Studios has been working on the project as strategic advisers and architect to Historic England and Shropshire Council since 2003. The scheme won initial planning in 2010. In 2012, the redevelopment (initially costing £52 million) won Heritage Lottery Fund backing.

Client’s view
The commitment, design creativity and attention to detail from FCBS has been impressive throughout the project. Working in close collaboration with Historic England, FCBS has delivered a fine, conservation-led solution. There is now a real sense of pride, and a positive future ahead.
Duncan Wilson, chief executive, Historic England

Project data

Location Shrewsbury
Completion September 2022
Gross internal floor area 5,596m²
Net internal area 4,181m²
Construction cost £28 million
Architect Feilden Clegg Bradley Studios
Client Historic England
Project manager Historic England
Structural and civil engineer AKT II
Mechanical and electrical engineer E3 Consulting Engineers
Landscape architect LT Studio
Quantity surveyor Gleeds
Archaeology University of Salford
Ecology Middlemarch
Catering Cooper 8
Acoustics ION Acoustics
Main contractor Croft Building and Conservation
Embodied carbon New build elements 113 kgCO2e/m² (retained elements kept 886.4 tCO2e)
Predicted annual energy use 136 kWh/m²

CSMANLTD0 commentConstruction

August 25, 2023

Common Household Waste Product Can Make Concrete 30 Percent Stronger

The potential here is massive and could make civil construction significantly greener.

The use of fine sand in concrete is expensive and unsustainable, but researchers in Australia have found an ingenious solution that is far greener and most of us have it in our houses.
Image credit: ungvar/Shutterstock.

Researchers in Australia have used spent coffee grounds to make concrete 30 percent stronger. Simply by replacing a percentage of sand with waste coffee, something common to many households, it is possible to make construction more efficient and greener.

“The inspiration for our work was to find an innovative way of using the large amounts of coffee waste in construction projects rather than going to landfills – to give coffee a ‘double shot’ at life,” lead author Dr Rajeev Roychand, a Postdoctoral Research Fellow at RMIT, said in a statement.

Because spent coffee consists of fine particles, they were proposed as useful resources for civil and commercial applications. To test the idea, the team collected spent coffee grounds from cafes in Melbourne, Australia, and then dried them. The coffee was then heated through a process called “pyrolysis”, which involves heating organic material, such as a biomass, in the absence of oxygen. This turned the coffee grounds into biochar.

The team then designed 12 mixes to compare the effects the grounds had when made into concrete. This consisted of spent grounds that were untreated (raw), and grounds that were heated to 350°C (662°F) or 500°C (932°F), respectively. These different products were then added to Portland cement at different percentages volumes (0, 5, 10, 15, and 20 percent volume) as a replacement for sand.

The concrete is then molded and cured at room temperature for 24 hours before being demolded and cured in water tanks to be tested for its compressive strength (to see how far it can be stressed before it fractures) and performance potential. This mix was then analyzed with X-ray diffraction (XRD) and scanning electron microscopes (SEM).

The results show that a mix consisting of 15 percent pyrolyzed grounds at 350°C significantly improved the structural properties of concrete – around 29.3 percent improvement in compressive strength.

More work needs to be done to continue developing and testing this method, but it is already showing promise and gaining interest.

“Several councils that are battling with the disposal of organic waste have shown interest in our work”, Roychand added.

“They have already engaged us for their upcoming infrastructure projects incorporating pyrolysed forms of different organic wastes.”

A wakeup call for the construction industry

According to the joint lead author, Dr Shannon Kilmartin-Lynch, a Vice-Chancellor’s Indigenous Postdoctoral Research Fellow at RMIT, the results of this study have significant implications for the construction industry across the world.

“Inspiration for my research, from an Indigenous perspective, involves Caring for Country, ensuring there’s a sustainable life cycle for all materials and avoiding things going into landfill to minimise the impact on the environment,” Kilmartin-Lynch explained.

“The concrete industry has the potential to contribute significantly to increasing the recycling of organic waste such as used coffee.

“Our research is in the early stages, but these exciting findings offer an innovative way to greatly reduce the amount of organic waste that goes to landfill.”

Importantly, the use of biochar in construction projects will relax pressure on the need for fine sand, which is a scares resource across the world. Sand is among the most extracted solid materials on the planet and the second most used resource after water. Moreover, the continued extraction of sand is extremely harmful to the environment.

“The ongoing extraction of natural sand around the world – typically taken from river beds and banks – to meet the rapidly growing demands of the construction industry has a big impact on the environment,” team leader Professor Jie Li explained.

“With a circular-economy approach, we could keep organic waste out of landfill and also better preserve our natural resources like sand.”

The study was published in the Journal of Cleaner Production.

CSMANLTD0 commentConstruction

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