wall material to enclose porch

8 Feb 2007
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United Kingdom
We have a detached bungalow with an open porch area approx 3m x 1.1m. The bungalow roof (and gable end) overhangs this porch supported by the property wall on 2 sides and a brick pillar in the far (front) corner which shall be retained.

I want to enclose the porch area. Others have done this by just using UPVC frame and glazing ( the walls are not load bearing) but we are not keen on this. We would like to brick up the 2 open sides (and have small windows) but the narrow width precludes using a cavity block wall. The 2 main alternatives would seem to be a stud wall with internal insulation (and vapour barrier etc) or a single block wall with external insulation like Kingspan ( the external finish will be stone cladding / internal finish to plaster).

Which method would allow the best insulation (u value)? Are there "special" lightweight insulated blocks for this type of job ( I read somewhere less dense blocks have better insulation values). Any better suggestions? The enclosed porch will be heated so the aim is best insulation value for a circa 200mm thick wall to allow a finished internal width of 0.9m
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If the heating is connected to the house system then building regulations will apply, and that will determine what walls to build.
I built my porch walls from 4x2 stud work, with 100mm Celotex type insulation within the studwork, and 25mm Celotex type insulation across the inside. 5" of Celotex is adequate for a roof, let alone a wall, and the foil provides a vapour barrier. I then used plasterboard on the inside, and OSB, breather membrane, battens and cedar cladding on the outside.
you obviously have a desire to heat it, but why? most porches aren't heated, and as woody says, it gets difficult regs wise.
Just enclosing it will make it seem very much warmer
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Thanks for replies.The heating will not be connected to the house. It will be a standalone electric rad switched on from the porch. I think that satisfies the regs (or use to). GTH's solution seems a good one, what thickness/grade OSB did you use? Would Marine Ply be better?
I used 11mm, I think. There's no need for anything more expensive than that; it's only to provide rigidity to the frame.

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