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Flat roof design 101 from basics for the Suffolkian idiot….


G and J

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So, to restart my thinking I’ve gone back to basics.   
 

Here’s our flat roof. 
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My first question is:  Is there enough room to get a cold roof sufficiently ventilated using those little upstand vents and the fact that the skylight mucks up cross flow?

 

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I used 9x2 joists boarded with ply Then a layer of multi foil Then fairings Toped with OSB 3

Plywood on the top of the blockwork 

and returned the fibreglass over to make a watertight seal 

First attempt at fibreglass 

150 kingspan between the joists 

Then boarded with 15 mil duplex and then skimmed it over with a couple of coats of multifinish 

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