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When is the introduction of a cement board required exteranlly on a timber framed extension? It is single skin, in its own grounds and no boundaries to consider. The rain screen is either render board or plastic cladding, no descision on that as yet, although if plastic cladding it will add an...

If I know the ratio and safe working load of a lintel from the manufacturer how can I work out the proposed lintel is up to the job. E.G. A window span of 1.8m with 2 courses of blocks over the top and a pitched 20 degree roof. 700mm returns each side. So a 2.1 lintel having a SWL of 23kn Dead...

Hello,first time poster long time lurker. Building a mono pitch/lean to garage,looking to cost the timbers. Is the span measured horizontally from the external of the wall plate to the wall? Then use Trada span table and the correct pitch. or is it measured along the pitch of the rafter. Thanks...