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Where to insulate joists...

voodoo · 2010-04-23 12:52:59

Hi all, Just wondered if you can help. I am trying to figure out where we should insulate the joists - do I insulate undert he ceiling (between joists) or on the plywood, beneath the UFH - which will have a 50mm screed on it. From speaking to tradesmen, I am getting conflicting reports - 1) Insulating with…

23-04-2010 1:52pm

#1

voodoo

Registered Users, Registered Users 2 Posts: 786 ✭✭✭

Join Date: February 2002

Posts: 571

Hi all,

Just wondered if you can help. I am trying to figure out where we should insulate the joists - do I insulate undert he ceiling (between joists) or on the plywood, beneath the UFH - which will have a 50mm screed on it.

From speaking to tradesmen, I am getting conflicting reports -

1) Insulating with Rockwool/Fibreglass between the joists (under the ceiling) means that the heat remains in the downstairs

2) Insulating on the ply means that the heat remains upstairs

I am leaning towards 1, but maybe the best thing to do would be both...

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