Timber size for 3m span suspended ceiling in conservatory

31 Mar 2016
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United Kingdom
I'm thinking of creating a suspended ceiling in my conservatory, something as light as possible and fairly easy to take down if need be.

Planning to use 3x2's or 4x2s for the 3m span - creating a rebate either side to sit on the conservatory frame. Then clad under with some sort of upvc - either t&g or plain boards. What size timber would suffice?

Also I'm a bit stuck for insulation. I was going to use loft roll or PIR boards for better thermal properties, just worried about possible condensation up there. So then I was thinking of multifoil because it negates the need for a vapour barrier, stapling that to the roof side of the joists.

Obviously this is a bit of a bodge job until we can afford a proper re-roof.

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