Roof Insulation (not loft, not flat roof)
Discussion
The roof over our stairwell and hallway runs from the roofline of the main shell down to ground floor level, and this is the one part of the house that is always cold.
I've had a look and there is no insulation at all in it: the loft itself is insulated, but the sloping roof (about 10m2) is simple lathe and plaster ceiling, joist space, tiles.
Whats the best way to insulate this - tiles off and insulation, then re-tile, or ceiling down, insulate and new plasterboard cceiling? - or a MUCH bigger radiator and live with the heat loss??
I've had a look and there is no insulation at all in it: the loft itself is insulated, but the sloping roof (about 10m2) is simple lathe and plaster ceiling, joist space, tiles.
Whats the best way to insulate this - tiles off and insulation, then re-tile, or ceiling down, insulate and new plasterboard cceiling? - or a MUCH bigger radiator and live with the heat loss??
You'll need to think this out first.
Unlikely you'll have enough depth for 100mm insulation, whilst retaining an air gap. The aim is 130 (70 between rafters, remaining below?) overall insulation. This will mean lowering the ceiling height a fair bit , fine if it makes no odds.
There's also insulated plasterboard, 30mm overal & 22mm overall.
If you want the minimum fuss, thermal lining paper.
Unlikely you'll have enough depth for 100mm insulation, whilst retaining an air gap. The aim is 130 (70 between rafters, remaining below?) overall insulation. This will mean lowering the ceiling height a fair bit , fine if it makes no odds.
There's also insulated plasterboard, 30mm overal & 22mm overall.
If you want the minimum fuss, thermal lining paper.
mondeoman said:
Given that the tiles aren't exactly air tight, why bother with an air gap, and not just fill the void (its about 3") totally?
I'm assuming the area of roof in question has felt?The gap needs to be on the underside of the felt.
Is it breathable or regular felt?
You may be better looking at 'quilted/multifoil blanket' type insulation.
Well, you have a point! 
In theory, no it won't make any odds. If you don't want to lose ceiling height you'll need a vapour barrier, foil backed plasterboard will achieve this. As I've mentioned, insulated plasterboard could also be used in conjunction with kingspan between the rafters. 130mm is current requirements but whatever you can achieve will be a big improvement.
In theory, no it won't make any odds. If you don't want to lose ceiling height you'll need a vapour barrier, foil backed plasterboard will achieve this. As I've mentioned, insulated plasterboard could also be used in conjunction with kingspan between the rafters. 130mm is current requirements but whatever you can achieve will be a big improvement.
We had a similar problem.
I cut some 50mm Celotex to the width of the rafters so it was a loose fit and then pushed it down from the loft space.
Let's face it, any insulation will make a big difference.
130mm is overkill on a building that age, which probably has wooden suspended floors and solid walls.
I cut some 50mm Celotex to the width of the rafters so it was a loose fit and then pushed it down from the loft space.
Let's face it, any insulation will make a big difference.
130mm is overkill on a building that age, which probably has wooden suspended floors and solid walls.
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