SureCav 50

Sold in packs of 5 or 10 sheets (min. order 10 sheets)   ...

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SureCav 50

SureCav 25

IMPORTANT: Please check that you have ordered the correct depth of...

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SureCav 25


SOLD IN BAGS OF 50. It is recommended to fix each panel with 5 washers....

  • Total price


    Ex VAT


Advantages of SureCav


  • Lowers U-Values by making more room for extra insulation
  • Option to increase internal room space
  • 25mm permitted residual cavity
  • Maintains an essential air gap
  • Fully BBA certificated
  • Suitable for use with brick, stone, flint or slate external finishes
SureCav25 with Ashler stone


Significant cost savings

SureCav25 forms a 25mm clear cavity providing a backing board for the stone, slate, brick and flint outer leaf. It halves the cost of building with a backing block and produces a sixth the CO2 footprint, compared to using a concrete block backing wall and is fully BBA certified. 

Gain more space with SureCav25!

A reduction in wall thickness of 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. Already an additional 5% floor space will have been gained by removing the need for 100mm concrete backing blocks. This can rise to upwards of 7% additional floor space in cases where random stone is used in very severe weather zones, which may require a 75mm clear cavity.

Consider this, with an overall 7.5% gain, this is equivalent to the floor space of 6 extra houses on an 80 house site!

Reduce the width of the wall with SureCav25

SureCav is lightweight and easy to move around the site!

The equivalent wall area of SureCav panels, that would require 40 tonnes of 100mm concrete blocks, will easily fit into a pick-up truck.

Free up valuable space on site!

Avoids building an additional block construction wall which could require up to 40 tonnes of blocks, as shown. SureCav is the perfect cavity protection system when working with stone, slate, brick and flint.


Consistent clear cavity

Now guarantee clean and moisture free cavities with SureCav25! The SureCav25 cavity backing system is used to form a consistent 25mm clear cavity width in new masonry or timber frame constructed cavity walls of domestic and non domestic buildings and is fully BBA certified. It is our experience that a clear section of the cavity should always be present in the construction of the walls. The 25mm air gap between the outer layer of masonry and the insulation, coupled with the moisture beating design of the SureCav25 panels, will prevent any water penetration. The SureCav25 panels will also hold the insulation in place, adding to its effectiveness in preventing heat loss.

Experience the Future of Cavity Wall Construction!

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, by maintaining the original internal and external dimensions of the property, SureCav25 will release 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)

Protect from wind driven rain

In severe exposure zones there is a requirement for a clear cavity up to 75mm, however, you can use SureCav25 and save up to 50mm space. In any exposed zone, SureCav25 protects the building envelope against water penetration.  

Reasons to build with SureCav25 in all exposure zones:

  • BBA approval to form a 25mm clear cavity
  • Forms a barrier to protect from wind-driven rain
  • Excellent surface for the construction of any external wall masonry but shields the cavity and inner leaf from water ingress
  • Ideal for timber-frame and traditional block inner leaf, as well as SIPs, SFS and ICF construction





SureCav25 is a moulded, 100% recycled, polypropylene panel with spacer protrusions, forming a 25mm clear cavity and providing the perfect backing board for the stone, slate, brick and flint outer leaf. It is a sixth of the CO2 footprint, compared to using a concrete block backing wall and is fully BBA certificated. This cavity protection system ensures clean and moisture free cavities with either timber frame or traditional construction.

100% recycled plastic
A sixth of the CO2 footprint, weight for weight, when compared with concrete blocks
Half the cost of building a block supporting wall
Panel size: 1200mm (L) x 450mm (H) x 25mm deep. Yes! Just 25mm deep. This also gives the option for more room in the cavity for insulation, enhancing the thermal performance of the building envelope.


SureCav has many advantages over traditional systems.

Now available in 25mm or 50mm deep panels!

  • It saves money: SureCav effectively halves the cost of using a backing block support wall. Click here to see cost comparison
  • It guarantees a completely clean cavity as no mortar can penetrate the polypropylene barrier, ensuring the wall-ties remain free from contamination
  • Injection moulded from 100% recycled polypropylene
  • It results in an extra 5% internal floor area on a two storey house if the original external dimensions are used
  • SureCav is very light and takes up less than a quarter of the space of the concrete blocks it replaces
  • It is much more environmentally friendly, weight for weight, than concrete blocks that produce large amounts of CO2 in manufacture. See the Carbon Footprint Calculations
  • SureCav is easy to transport saving fuel (see below) and to move around a building site compared with concrete blocks.
  • Footings are 100mm narrower meaning there is less excavated material to dispose of and less concrete required in the foundations.
  • When installed, SureCav holds the insulation against the inner leaf, guaranteeing the insulation works to its full efficiency.
  • Using SureCav ensures no water penetration from wind driven rain with a 25mm or 50mm cavity not the usual 75mm demanded in some high exposure zones. Click here for more details

Natural stone is an outstanding building material.

It is both practical and durable, and can be cut to any shape or form. The great thing about natural stone is that the older it gets, the more beautiful it becomes. Using natural stone shows that you take seriously your responsibility to care for your surroundings by actively striving to preserve, restore or improve the natural environment.

Appreciation of the importance of flint.

Flint and its effects can produce stunning results, especially when laid in alternate bands in stone or with brick quoins. 

The beauty of slate.

Slate has been used as a natural building material for centuries. It is easy to shape and work with, making it a popular choice for wall construction. Slate is a long lasting material giving a beautiful effect, helping to promote your home as friendly to the environment.

Cotswold limestone block.

Limestone is commonly used in the production of natural building stone and masonry products. One option is to use a random rubble effect using sawed limestone blocks with a recessed mortar joint, normally laid as a 110mm facing or outer leaf with cavity. Broken blocks or a Bookleaf effect is acheived by laying the blocks horizontally to create a layered 'book leaf' appearance. This is for facing or cladding only - not to be used as a structural wall - but an excellent example of where SureCav provides the best backing surface whilst maintaining a clean and moisture free cavity.

The speed of build, easy storage and handling make SureCav an ideal system. We have found this especially to be the case where storage and working space on site is at a premium.