BUILDING ENVELOPE (ROOFING & CLADDING)
these screw threads are designed to allow the best possible anchoring without causing the timber to split. They are also self-drilling so there’s no need to pre-drill (unless you’re using a dense hardwood).
A compensation strip can be used to aid ventilation, as it creates a gap between the timber elements of the facade, and can be applied to both vertical and horizontal cladding. For horizontal cladding, it is simply fixed to the vertical batten whilst for vertical it should be fixed on the upper edge of the horizontal batten to ensure that a water trap is not created.
stainless steel screws, is designed to be an ideal fixing system for rainscreen cladding. This type of ‘secret fix’ system creates a free flow of air between the back face of the cladding board and the vertical batten, enhancing ventilation and thereby increasing the durability of the timber. The secret fix element means the front face of the facade boards are left fully intact for a clean and contemporary look. We recommend leaving an 8 mm open shadow gap between boards and using a black,
unbranded, UV-resistant breather membrane to avoid the membrane showing through the gaps. This type of fixing system also provides the flexibility of allowing the cladding to be easily removed at the building’s end of life or repositioned, for example if you choose to extend.
For a neat way to deal with visible fixings, consider using a stainless steel screw such as SIHGA L-GoFix A2 – precision milled from hardened, A2 grade stainless steel. The sharp flanks of
Cost is inevitably a factor for self- builders, and can vary hugely between timber species and grades. Premium quality timber cladding is inherently durable, meaning no protective coating will be necessary if detailed and installed correctly so the decision to coat would purely be an aesthetic one. It might seem tempting to select a cheaper timber but bear in mind that cheaper, less durable timbers will require treatment and regular maintenance, which may prove more costly in the long run.
John Russell is managing director at Russwood
january 2020
www.sbhonline.co.uk
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