Insulating your flat roof can reduce your roof’s heat loss by around 90% and save you hundreds of pounds a year on your heating bill.
How it works
Roof insulation works by helping your home to retain heat– reducing the amount of fuel you need to burn for heating and reducing your heating bills in the process.
Flat roofs should ideally be insulated from above using insulation boards. These can be attached either on top on your roof’s waterproof covering or between the timber and the weatherproof layer. It’s ideal to do if you are replacing your roof covering, and is actually a legal requirement in this situation. You can get the insulation installed on the underside of your roof instead, but this may cause condensation issues. Both types of insulation should usually be installed by a contractor.
Cost and Maintenance
A guide to roof insulation types and costs is available here.
Roof insulation can typically save the average home £180 a year on their heating bills.
- I know about cavity wall insulation, but my home has solid walls. Can I insulate these?
- Yes, you can insulate solid walls, and doing so will save you even more money on your bills than cavity wall insulation. Solid wall insulation can be fitted as either external or internal insulation - you can use our assessment tool to see how much you can save with these measures.
- How much loft insulation do I need?
- To meet current Building Regulations you need 270mm of mineral wool insulation - that's 100mm between the ceiling joists and 170mm laid over the joists.
- My loft has been fitted with floorboards - will this cause a problem?
- Not necessarily. You can lay the insulation once the floorboards have been taken up, and put the floorboards back over the insulation, or, if you prefer, you can have your insulation lain directly over the floorboards.
- There is a lot of pipework in my loft space. Should I insulate the pipe work too?
- Yes, it is a good idea and many insulation installers will do this for you - it usually involves fitting foam 'jackets' over the pipes.
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