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.
- How can I tell if my new home's previous owners have already insulated the cavity walls?
- If a house was built within the last ten years, it probably has cavity wall insulation installed as slabs when the walls were built. You can tell if previous owners have had it installed after the house was built by looking at the outside of the external walls under your windows. If there are small holes of about an inch diameter filled in with something, this indicates that your walls have been filled with insulation. Another way to tell is by looking at the tops of your external walls, which may be open under your roof. If you can look inside the tops of the walls you may be able to see whether there's any insulation in them.
- 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.
- I have lots of rubbish in my loft. Do I need to clear it out or will the installer do this for me?
- Yes, you will need to clear the roof of any rubbish or stored objects before the insulation is installed.
- How long would it take me to insulate my loft?
- Allow about half a day once you have bought the insulation. Remember - you will need one layer of 100mm between your roof joists if you don't have any insulation, then a second layer of 170mm on top (cross layered) to comply with current building regulations. Measure the area of your loft and look at the packaging label for the area contained in a roll.
- Why wasn't my house built with cavity wall insulation and the right amount of loft insulation?
- Houses comply with the building regulations that apply at the time the property is built. Since the oil crisis in the early 1970s, the insulation standards in the Building Regulations have been progressively upgraded.
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