SureCav 25

£10.75
Total Price £107.50 ex VAT Price per item £10.75 ex VAT

Panel size: 1200x450x25. SureCav25 is a 25mm deep version of the popular SureCav50 Cavity Spacer Backing Board. It 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 fully BBA certificated. This cavity protection system ensures clean and moisture free cavities with either timber frame or traditional construction.

New product - order online now or through all Builders' Merchants!

SureCav25 is a BBA, LABC, and NHBC accepted construction system.

Include Washers (Bags of 50) For timber frame (if required): 5 washers per sheet
SureCav 25
+
Washers (Bags of 50)
Total price inc. Washers (Bags of 50): £112.50 ex VAT

Panel size: 1200mm (L) x 450mm (H) x 25mm wide

Yes! Just 25mm wide. This allows for more room in the cavity for insulation, enhancing the thermal performance of the building envelope.

SureCav25 Cavity Protection System

Experience the Future of Cavity Wall Construction!

SureCav25 Reduce Cavity Width - Reduce U Values

Now drive down U-Values! SureCav25 allows for more room in the cavity for insulation, thus enhancing the thermal performance of the wall.

All the properties of SureCav50 you’ve come to rely on… but now just 25mm deep, with a guaranteed 25mm clean and moisture free clear cavity.

Building on the success of SureCav50, the “wall” of plastic, formed by the SureCav25 panels not only provides an excellent surface for the construction of the outer masonry leaf but shields the cavity and inner leaf from water ingress. The unique shape of the SureCav25 pods directs any moisture to the outside leaf, thus protecting the fabric of the building with a 25mm clear cavity. The barrier formed by the panels, locked together by the joining strips, will protect the structure in even the most exposed weather conditions.

SureCav25 allows for more room in the cavity for insulation, enhances the thermal performance of the building envelope and ensures a 25mm cavity. Using the original external dimensions of the property, SureCav25 will create around 1.25% extra floor space in the dwelling, rising to 6% additional space in some cases. Consider this, with a 1.25% gain this is equivalent to the floor space of 1 extra house on an 80 house site!

  • Alternatively, SureCav25 makes more space in the cavity for insulation, making it possible to achieve a U-value of 0.18 W/m2K within a 100mm overall cavity
  • Removes the need for a backing block when building with natural/random stone
  • Guarantees a consistent clean, mortarfree and moisture-free 25mm clear cavity
  • BBA approved 25mm free cavity in very severe exposure zones
  • 100% recycled polypropylene
  • Durable and remains effective for the life of the building
  • SureCav25 will significantly reduce labour and material costs with a faster, cleaner build
  • Ensures no water penetration from wind driven rain
  • SureCav is now being used by architects, builders and developers nationwide!

Protect from wind driven rain

The trend being experienced towards wetter weather in the UK means greater consideration has to be given to protecting the building envelope against water penetration - especially in severe exposure zones.

Reasons to build with SureCav25 in severe exposure zones

  • Full BBA approval to form a 25mm clear cavity
  • Gives the option of more insulation
  • 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
  • Suitable for stone and all masonry finishes in severe exposure zones
  • Guarantee clean and moisture free cavities with SureCav25!

Consistent clear cavity.

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.

More information and instructional videos here

Fixing: Wall ties are used, as standard, vertically every 450mm mortar course. Helical ties are most useful where additional support is required between courses and can be fixed through the flat face of the sheet. For timber frame, it is recommended that sealing washers are screwed into the back of the pods, with or without additional timber frame ties to hold the system in place prior to the construction of the outer masonry leaf.

  • Example 1: 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.
  • Example 2: 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.

TIMBER-FRAME STEP BY STEP INSTALLATION

First, make the corner piece. Using the bend line on the sheet, bend the flat sides together. Now bend the sheet the other way until the pods are touching, repeating this a couple of times until you have the angle you require.

Place this corner piece directly against the breather membrane of the timber-frame structure and, using the joining strips, continue to build the panels along in each direction.

If you find you need extra ties for random stonework, screw the tie into the back of the SureCav pod using a seal-washer. If you simply wish to fix the panel in place – then just use the seal- washer without the tie.

Now, fit the horizontal joining strips before starting the next row, cutting them around the timber-frame ties. It is recommended that the joints of the panels are staggered to add strength to the system. Then continue to fix the panels along the row, trimming the length to meet the corner panel.

Please note: The 900mm joining strips are to be used for the horizontal joints. Cut a long joining strip up to a wall tie and use the off-cut to start the next section. The 400mm joining strips are designed to exactly fit the vertical joints of the SureCav panel.

If you find the cut coincides with the pods, then cut a shorter length and insert a new SureCav section.

The stone wall is built directly against the panels. These SureCav panels remain in the cavity for the lifetime of the building, providing an excellent air-flow system that ensures the cavity remains free from the build-up of moisture.

BLOCK INTERNAL LEAF STEP BY STEP INSTALLATION

You first need to create the corner panel. Locate the bend line on the sheet and bend the flat sides together. Now bend the sheet the other way until the pods are touching, repeating this a couple of times until you have the angle you require

The SureCav panels are placed directly against the insulation sheet, holding the insulation in place, enabling it to work to its full efficiency.

Using the joining strips, continue to build the panels along in each direction, trimming the panels around air vents and cavity trays as necessary.

Fit a horizontal joining strip before starting the next row. The SureCav panel is fixed in place using a wall tie clip on the wall ties that are fitted as standard at 900mm centres. Note that the horizontal joining strips are cut around the wall ties and if extra ties are required for random stonework, helical ties can be fitted through the sheets of SureCav but, of course, not through the pods.

Please note: The 900mm joining strips are to be used for the horizontal joints. Cut a long joining strip up to a wall tie and use the off-cut to start the next section. The 400mm joining strips are designed to exactly fit the vertical joints of the SureCav panel.

It is recommended to stagger the joints of the panels as this will add strength to the whole system. Then continue to fix the panels along the row, trimming the length to meet the corner panel. If the cut coincides with the pods, then cut a shorter length and insert a new SureCav section.

The stone wall can then be built directly against the panels.

When building up the inner skin of block-work, always ensure that a board is placed over the cavity. It is essential that the cavity is kept free of mortar during construction.

These SureCav panels remain in the cavity for the lifetime of the building, providing an excellent air-flow system that ensures the cavity remains free from the build-up of moisture.

  • SureCav25 Cavity Protection System.