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  • Advantages of SureCav

    Below, we list the advantages of SureCav. SureCav25 has same properties as SureCav50, but with the added benefit of being only 25mm deep!

  • SureCav video

    Learn more about SureCav

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SureCav is unique

A new and lightweight alternative to heavy and expensive concrete backing blocks. SureCav increases floor space and acts as a rainscreen to the harshest weather. BBA certified and readily available to specifiers, SureCav is the ultimate space and cost saving solution for cavity wall construction.

SureCav benefits

  • Is BBA certified
  • Lowers U-values by making more room for extra insulation
  • Increases internal room space
  • Maintains an essential air gap
  • Offers a space-saving 25mm permitted residual cavity
  • Protecs from wind-driven rain, which keeps moisture out of the cavity
  • Available on NBS Source & NBS Chorus
  • Suitable for use with brick, stone, flint or slate external finishes

Huge cost savings

Concrete is deceptively expensive. SureCav can significantly lower your building costs. It forms a 25mm or 50mm moisture-free clear cavity, providing a backing board for the stone, slate, brick and flint outer leaf. This halves the cost of building with a backing block. It’s also environmentally sound, producing a sixth of the CO2 footprint compared to using a concrete block backing wall.

Gain even more space with SureCav25

The gains in space are equally huge. A reduction in wall thickness of just 25mm will increase the internal dimensions of the property by 50mm in each direction and result in an average of 1.25% increased floor space over 2 floors.

Removing the 100mm backing block adds another 5% internal space. This can rise to over 7% additional floor space in very severe weather zones, where a 75mm clear cavity may be required.

This results in an overall gain of 7.5%. That's equivalent to the floor space of 3 extra houses on an 80 house site!

Why use Surecav?

  • Reduce your carbon footprint!
  • Lighter than concrete – and easy to handle
  • The future of cavity-wall construction with SureCav25
  • Say goodbye to moisture problems
  • Protection from the harshest rain
  • 40 tonnes of 100mm concrete blocks

    Reduce your carbon footprint!

    SureCav ticks all the right environmental boxes. It’s made from 100% recycled plastic – a sixth of the carbon footprint of the equivalent in concrete blocks! All without any compromise on performance.

    Read more about how eco-friendly SureCav helps the environment here.

    Read more

  • Surecav equivalent of 40 tonnes of concrete block

    Lighter than concrete – and easy to handle

    As well as costs, SureCav saves you valuable site storage space and is easy to transport. The SureCav equivalent wall area of 40 tonnes of 100mm concrete blocks will easily fit into a single pick-up truck. That reduces the risks of injury and dramatically cuts fuel costs.

  • Surecav 25 Insulation Options

    The future of cavity-wall construction with SureCav25

    Now drive down U-Values. SureCav25 allows for more room in the cavity for insulation, thus enhancing the thermal performance of the wall. Where heat conservation is the prime concern, SureCav25 frees up an additional 25mm in the cavity that can be used for extra insulation.

    This example shows how a 100mm overall cavity width, comprising 75mm board insulation and a 25mm clear cavity using SureCav25, can achieve U-Values as low as 0.18 W/m²K. Alternatively, a 125mm overall cavity width, comprising 100mm board insulation and a 25mm clear cavity using SureCav25, can achieve U-Values as low as 0.15 W/m²K. (Figures calculated using Kingspan Kooltherm K108 Cavity Board insulation and the Kingspan U-Value calculator)

  • Surecav diagram

    Say goodbye to moisture problems

    SureCav prevents any water penetration through porous masonry. SureCav’s cavity backing system forms a consistent 25mm or 50mm clear cavity in new masonry or timber frame walls.

    The air gap – coupled with the moisture-beating design of the SureCav panels – lets you guarantee clean and moisture-free cavities. The SureCav panels will also hold the insulation in place, adding to its effectiveness in preventing heat loss.

  • Surecav weather protection system

    Protection from the harshest rain

    In very severe exposure zones there is sometimes a requirement for a clear cavity up to 75mm, however, SureCav prevents moisture from bridging the cavity. Additionally, the unique shape of the SureCav pods direct any moisture to the outside leaf, protecting the fabric of the building.

SureCav25 and SureCav50 - easy to source on NBS

SureCav is available on both NBS Source and NBS Chorus – the most popular and comprehensive products for specifiers in the construction industry.

For architects, designers and builders, both SureCav50 and SureCav25 are as easy to source as they are to work with.

Add SureCav to your spec here

A certified choice

You can specify SureCav with confidence. Approved by the British Board of Agrément (BBA certification No. 04/4154).

It’s the only BBA-certified alternative to concrete backing blocks or shuttering that guarantees a moisture and mortar free cavity and allows a minimum 25mm residual cavity.

View BBA certification

Reasons to build with SureCav in all weather zones:

  • Shields the cavity and inner leaf from water penetration
  • Significant cost savings
  • BBA certified
  • Available on NBS Source and NBS Chorus
  • Forms a barrier to protect from wind-driven rain
  • Excellent surface for the construction of any external wall masonry
  • Ideal for timber -frame and traditional block inner leaf construction
  • Environmentally friendly
  • Ideal for SIPs, SFS and ICF construction