28 Jan '12, 2pm

What wrap or spray insulation would be recommended for use on aluminum beams that will penetrate a building? #green

Martin as usual is spot-on. Cantilever penetrations of the building wall should be considered a no-no for several very good reasons - in any case aluminum would be a poor choice because of its high thermal conductivity and non-optimal structural performance. The trekhaus balconies are a good alternative to a cantilever, but if you have no building projections to take advantage of you could have your balcony designed as a self-supporting unit using the balustrades on each side as suspension brackets. Either way you'd still have minor structural fixings through the WRB but these would be no more than for a typical deck, and easily managed.

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