How do I install SureCav?

See the instructions on the ‘Products’ tab, for each product

Do you supply wall ties and wall tie clips with system?

No. The SureCav System comprises SureCav25 and SureCav50 panels and the joining strips (and seal washers for timber-frame). It is the customer’s responsibility to supply ancillary items and ensure that best building practice is maintained.

What fixings should be used with external timber framed walls?

SureCav Limited only supply the seal washers, not the fixing screws or wall-ties. To comply with Local Authority Planning Departments and NHBC Standards (6.2: External timber Framed Walls) M10 wall ties and their fixings should be of austenitic stainless steel, comply with the BS EN 845 and be capable of accommodating anticipated differential movement.

Does the cavity need to be ventilated?

Appropriate ventilation for the cavity must be provided by air bricks or perp/weep vents, providing a minimum of 1500mm2 per linear metre, venting at DPC and lintels as normal and high level if required – see BBA certificate section 9:2. Ensure a corresponding slot, matching the vent aperture, is cut in the SureCav panel to allow full ventilation.

What insulation type is recommended with use with SureCav?

SureCav must be installed against a robust surface, so ideally, a board PIR insulation is best suited. SureCav25 will allow an extra 25mm insulation in a designed 100mm cavity, helping to achieve a possible U-Value with 75mm insulation to 0.18W/m2K. SureCav25 helps to minimise the overall wall thickness with deeper insualtion, whilst still ensuring a 25mm residual cavity.

Is SureCav compatible with Rockwool partial-fill cavity insulation?

Rockwool can be used as a suitable partial-fill cavity insulation material as long as the type of rockwool used has a robust surface. It is especially important that the surface of the insulation does not compromise the moisture protection groove on the SureCav pod.
There are several products available that would be acceptable, e.g. dual density stone wool products that have a high-density outer layer and a lower-density sub-layer.

Can I use SureCav with SIPs panels?

Yes, SureCav still provides the best means of forming a cavity, an essential element in construction. The external leaf of stone, flint, brick or slate can then be completed with ease.
Structural Insulated Panels (SIPs) offer a modern, cost-effective, environmental and energy efficient solution to building construction. A SIPs building is constructed by assembling pre-manufactured panels which are heavily insulated, often eliminating the need for additional insulation. The panels are very strong and used in external and internal walls. The ties are fixed to the outer face of the SIP panel with a stainless steel screw.
The SureCav panels are fixed, as with timber frame, by a stainless steel screw and seal washer through the pods (recommended 5 per panel) see seal washers above. Install a row of SureCav, and along the top of each row, fix the frame ties at the specified centres. There are no studs in the SIPs so the tie can be fixed as needed. Trim the long joining strips at the tie and continue with the off-cut the other side.
For more information about SIPS panels and full SIPS building systems, see www.supersips.uk.com

Would the SureCav cavity system be suitable for use with an ICF (Insulated Concrete Former) construction such as Nudura?

SureCav25 and SureCav50 have both been successfully used on ICF structures. The SureCav panels will provide a suitable drainage membrane, designed to keep the residual cavity it forms completely mortar and moisture-free, with the pods in the sheets preventing any moisture from crossing the cavity. Wall-ties are screwed into the special vertical sections of the ICF wall and fit between the SureCav panels each 450mm vertically, at the local designers specified centres.

Can SureCav be used with flint construction?

SureCav has been specified on many flint projects and was also featured on Grand Designs (Newbury Christmas Cottage 2013). The flint being placed directly against the SureCav sheets, with the SureCav acting as an effective backing board, protecting the cavity from moisture and mortar.
Additional support for the flint can be achieved by fitting frame ties, with the SureCav seal washers through the pods, or helical ties where needed through the flat face of the SureCav panel only. Also, stainless steel EML can be set in the bed for support, cable tied to the wall ties.

Will SureCav support a natural rubble rag (limestone) stone 125-150mm thick outer leaf?

SureCav was designed for this scenario, with standard ties at 450mm vertical SureCav board intervals. Additional frame ties can be fixed through any of the pods using the SureCav seal washers.
For additional support, drill a pilot hole into the block inner leaf and fix a helical tie through any flat surface of the SureCav panel only, not through the pods.

Does the stonework have to be coursed, or can it be used with rubble stone walling as well?

Standard ties are installed each SureCav board coarse, 450mm vertically as normal. For random/rubble stone or flint, fix additional ties for extra support through the pods with the seal washers as required. Helical ties can be fixed through any flat surface of the SureCav sheet (not through the pods)

Can SureCav be used with raked joints?

Raked and semi-dry coursework are acceptable and often used. Some local authorities insist on a minimum 100mm mortar bed, but is down to the structural engineer/designer to confirm with the authority.

Are there any implications to using SureCav in a radon area and is it compatible with barriers by Visqueen etc?

If SureCav is required for stonework below DPC then trim the SureCav to the tray or Radon barrier and then continue with the SureCav above, ensuring the Radon barrier is kept intact.
Ensure proper ventilation to the cavity, as per BBA cert. (see BBA certificate) which requires 1500mm2 per linear metre run, achieved by air bricks/perp vents at low level, lintels and high level if needed.