For most skillion roofs the amount of air movement in the roof cavity, although limited, is sufficient to remove small amounts of vapour. The trick is to keep those amounts of water vapour small.
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Although steel framing in domestic construction has only a small market share, there are signs it may be on the increase. Since steel is a good conductor, builders need to be aware of potential pitfalls, such as thermal bridges and condensation.
On the surface, profiled metal as a sheet wall cladding should be a straightforward option, after all it’s been used successfully on roofs for years. However, when used on walls it poses its own set of unique challenges.