DIY Doctor

warm flat roof construction

Postby Somersetpete » Thu Nov 21, 2019 9:22 am

hi, im new to this so hopefully im posting this in the right place..

i have two questions regarding a flat roof extension we will be building on the rear of out house under permitted development rules...

the extension is 6m long x 4.5m wide, we have approval from our council under the neighbour consultation scheme so all good so far.

first question is about the warm flat roof specified on the plans.,,
joist are 47 X 195 C24 laid across the 4.5m width, with 120mm insulation, OSB boards etc..
this all adds up to a very thick roof and im not sure how it will look with facia that thick.
could i notch the ends of the joist in the cavity, then build up few more course of brick on the outer leaf, leaving say 100mm of the joist extending out past the outer brickwork ?

second is about furring strips.
id like the fall to be away from the house along the 6m length, but this would mean putting furring strips at 90deg to the joist.
Can i simply add strips across the tops of the joists, gradually reducing in thickness to give the correct fall ?

i will try and upload a sketch later to explain my thoughts.
any advice appreciated
Somersetpete
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