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Cold Flat roof design and size of noggins if needed

Postby oillybob55 » Sat May 28, 2016 4:35 pm

Hi all

I am about to put a roof on my extension its 4.5mtrs long (with the 25mm over hang each end) and 6mtrs wide. I am using 200mm x 75mm timbers straight onto the block work with DPC between.
from the top down:
EPDM rubber
18mm OSB3 sheet
Vapor sheet
50mm air gap
150mm insulation
Plaster board

my questions are do I need noggins and if so where and how thick? do I do them 120mm and at the bottom to keep the 50mm air gap? Should I put timber around the top of the block work or rest the timbers straight on them?


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Postby welsh brickie » Sun May 29, 2016 12:15 pm

to keep the air gap free you can use galvanized straps instead
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