warm flat roof construction

10 Aug 2014
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United Kingdom
Hi all, my first post on DIYnot.
I am building a single storey, flat roof extension, and approaching finished wall height ( thermalite inner, 100mm full fill insulation with block outer skin.)
I would like to ask advice on the roof construction.

Do I need to use a wall plate on the inner leaf to attach the joists or sit directly onto the wall, fixing with straps. Or can I fix joists between walls using simpson safety fast joist hangers on the inner leaf with a wall plate on the house wall ?

Also do I need to close the wall cavity as there is full fill insulation ?

Many Thanks.
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