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PostPosted: Fri Feb 08, 2019 1:14 pm 
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Hello everyone. I've got a cold flat roof which is closed on all four sides. It's on a garage/storeroom and is used as a non habitable room. Last year it was leaking, so I had it re-felted. It has a number of skylights, so a new warm roof wasn't possible. The question is - now I'm ready to re-board the ceiling I was wondering if I could insulated between the joists. The roof has loads of full height noggins, so is really a number of small unvented rectangular spaces. The depth of joists varies and is between 160-180mm. My plan is to board the ceiling with 50mm insulated plasterboard (with foil barrier included on it) and leave the roof space empty. As it's just a storeroom, I doubt I will bother to heat it. Family just pop in and out to grab things.

I was wondering - Could I push up a load of mineral wool to completely fill all of the voids, so there is no air space and then board over?
Ideally I'd like the room to last 5-10 years max, as I will get an extension once my finances allow. Until then, it's a useful storage room and has a fridge and freezer in it. Just want to get the chill off it. Mineral wool is cheap and seems something that might help. Any opinions or should I just leave the space empty and overboard, as originally planned?


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PostPosted: Mon Feb 11, 2019 9:01 pm 
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Insulation stops heat escaping but does not heat a room, therefore even if insulated, if you do not heat the room it will be cold.
If you are doing an extension in 5 years I wouldn't bother to much.
In answer tonyoir question, there needs to be a 50 mm air gap. The ideal roof in this circumstance would be 150mm joists with 100mm insulation board between the joist leaving 50mm air gap and 50mm insulation under the joists with plaster board over.

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