01480 215 000


Residential Clayboard

Accredited by the British Board of Agrément

Residential Clayboard® has been accredited by the British Board of Agrément. Our void former products have achieved a mark of quality, safety and reliability that reassures specifiers, merchants and groundworkers that they’re choosing a product that has passed a series of regular comprehensive assessments.


Residential Clayboard® has a 100% recycled honeycomb core, which is set between lightweight polypropylene facings. Designed specifically for the residential market, this Clayboard® product creates a technically sound void to effectively protect a structure from clay heave damage as a result of ground movement.

When dry, Residential Clayboard® is strong enough to support the weight of wet concrete as well as steel reinforcements. Once water is introduced, it has the effect of switching off its compressive strength and leaves a technically sound space. Clay expansion can then be accommodated without exerting undue pressure on the structure above.

Benefits for you

BBA accredited to comply with NHBC standards
Offers a nominal compressive strength of 30kN/m2 when dry
Available in four different thicknesses depending on shrinkage levels
Thinner product saves soil excavation and muck away costs
Sustainable, cost-effective and simple to install on a sand blinding
Lightweight environmentally friendly material
Readily available through our extensive delivery network and preferred suppliers
Delivered to site in a weatherproof seal
No need to calculate safe and fail loads
When using our industry-leading product, clients also benefit as they have direct access to a dedicated account manager who will support their requirements from the first enquiry to long after the product has been installed.

Key Residential Clayboard Information


Clayboard 2_Sizes

Clayboard® is supplied in panels 2440mm long by 1000mm wide, by the specified thickness. Clayboard® is delivered to site on lightweight pads for easy unloading, and is polythene wrapped for protection.


The thickness required will be determined by the plasticity index, specified by the soil engineer. Varying thicknesses are available and a member of the Clayboard® team will be able to advise you on the best possible solution.



Clayboard® Residential (KN30) has a nominal compressive strength of 30kN/m2 when dry and is designed to support the weight of wet concrete up to 1m thick. When the core is made wet, KN30 Clayboard® will collapse under nominal compressive load of approximately 3kN/m2.

Additional Items

All of our Clayboard boards can be supplied pre-wrapped to site so they are ready to be laid with water protection. Our VoidPak Pipe system can be used in conjunction with Clayboard to effectively and easily introduce water to the Clayboard and start the honeycomb degeneration process.


Get In Touch

To speak with a member of our team about your Residential Clayboard® requirements, simply get in touch by calling us on 01480 215000 or by emailing clayboard@dufaylite.com.


I used Clayboard for the first time on a residential site last month. After ordering with Trisha from Travis Perkins, I was very impressed as the void former was on site in a few days. I have used other ground heave solutions before but none of them had delivered a true void, so I wanted to make sure I installed the product correctly. I had a quick look over the installation guidelines over a cuppa and I discovered the product was very easy to install. The product is lightweight and the fact it comes on weatherproofed pallets, makes my job easier when it arrives on site.

Groundworker, London

We like to deal with the market leading product manufacturers and the fact that we have been stocking and distributing Clayboard for as long as we have is testament to our relationship with Dufaylite. We always maintain healthy stocks of Clayboard, but there will be times when we need support from Dufaylite with a speedy replenishment. They are also quick to respond to quotation requests or questions about the product from our groundworks customers.

Tim Stubbs, Lemon Groundworks Solutions

I started to work with Clayboard on a number of sites about five years ago. I had been aware of other ground heave solutions previously, however after reading about the benefits of Clayboard on the website and getting to know Nigel at Clayboard, I realised Clayboard delivered numerous life cycle benefits to a project, plus it is technically a true void former.

I am often in contact with Nigel. He is reliable and extremely knowledgable of the product and the industry. Clayboard is competitively priced allowing the site to retain the cost benefits from less land excavation and ground prep, the level of service I receive from the team at Clayboard, the technical support of the product and the fast delivery times to site, help to ensure the site maintains its tight schedule.

Architect, Manchester

Find out More

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Our Products


Wrapping Solutions

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Waterproof Tape


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Residential Clayboard

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