Cold Pitched Roof

5 Aug 2009
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United Kingdom
I am about to build a lean-to extension to the rear of my 1950's brick bulit house, 7.5m long x 4.5m wide. My plan is to have a 15 degree pitched roof to feature a single pitch vaulted ceiling. Will C24 250mm rafters @ 400mm centres span this 4.5m alone? Covering will be a Decra Oberon Metal tile. Will a 200mm Crown Fibre glass roll between rafters with an insulation backed plasterboard to underside meet Part L1 building regs?
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I'm no s.e. or designer but it sounds as though the joists may be overkill.

The insulation could be achieved using a combination of fibreglass and p.i.r. foam, but it will require venting.

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