Important: Please check that you have ordered the correct depth of SureCav!
The original SureCav50 was designed to form a lightweight alternative to backing blocks that would increase floor space and act as a rainscreen from wind driven rain, effectively providing a consistent mortar and moisture-free 50mm clear cavity. Now, SureCav25 forms a 25mm clear cavity, making extra room for insulation or for creating even more floor space.
Please note that due to the large rise in the cost of raw materials, SureCav prices will be inceasing approx. 15% from January 1st. 2022.
SureCav is available on both NBS Source and NBS Chorus – the most popular and comprehensive products for specifiers in the construction industry. Go to NBS Source here
For architects, designers and builders, both SureCav50 and SureCav25 are as easy to source as they are to work with.
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.
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.
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!
40 tonnes of 100mm concrete blocks
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.
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 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.
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.
• 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