Worth adding more insulation to a warm deck roof?

[Sparky1979]

I have just had my flat roof relaid as a warm deck roof with EPDM.

Having now ripped down the ceiling underneath (after discovering it was in too bad a state to simply skim) is there any further benefit to chucking some insulation above the new boards? A kind of boots and braces approach!

Or do I risk problems with condensation and damp??

Cheers all,

 

[tony1851]

If you put extra insulation in, use the PIR/PUR board, push it up to the underside of the deck, and put a lesser thickness in than you have above the deck.

 

[noseall]

How thick is the warm deck insulation?

Our local BCO's insist on another 25mm of inso' pushed up tight against the roof deck insulation where 100mm has been fitted.

 

[Sparky1979]

90mm celotex boards on the roof. Was thinking of just stuffing some insulation into the void?

 

[noseall]

You may create a secondary cold spot if you don't push it up tight, though this is unlikely.

The idea is that the ceiling void is kept as the same temperature as the room below.

 

[Sparky1979]

Thanks for the responses. Much appreciated