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In the enviable position to build an extension on my 30's semi-detatched house. We have a tame builder, a good friend of mine, and we were discussing SIP's with him (I first saw them/heard about them on Grand Designs) he seems pretty keen, any downsides to using SIPs?
The only thing I can think about is it will be harder to change things in years to come - but this unlikely to happen.
Also what about flat roofs, more aesthetically pleasing imo but would you? Possibly thinking green roof.
I can see the benefit of SIPS where you design custom panels and build the whole thing in a warehouse then ship to site and assemble in a day but it'll cost quite a bit. If you want to use standard panels then there'd be a lot of fiddling joints and windows and doors. Can't see any benefit over standard block and cavity. Maybe for a workshop/shed with longer runs and less openings.
I put a fibreglass roof on ours with a view to putting a sedum green roof over the top. Still haven't got round to that bit yet but the fibreglass bit was easy enough to do and has been fine. Took 2 days including some fiddly bits around the rooflights.
Allegedly
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Sips are not that expensive now a days. Especially if you know a man. Very simple construction method, many cladding options. Flat roofs have come a long way. Beauty of Sips is you can get plastering before the outside is even finished in theory...
Built my shed out of sips panels.
Went quite well.