Roof Insulation

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.

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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.

Savings

Roof insulation can typically save the average home £180 a year on their heating bills.

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FAQs

If my house was built with a cavity, surely it's there for a reason?
The purpose of the cavity is to prevent rain that soaks into the outside brickwork from crossing to the inside wall. The cavity interrupts any water that soaks through the brickwork and drains it to the bottom of the wall where it drains to the outside. Injecting mineral wool insulation into the cavity still allows water to drain to the bottom of the wall, so the cavity still works as intended.
What guarantee of workmanship should I look out for in a cavity wall insulation installer?
Cavity wall insulation installers can sign up to a professional code of practice, such as those provided by the Cavity Insulation Guarantee Agency, which guarantees the work for 25 years. The installer should carry out post-installation checks on both the inside and the outside of the property, and you will be asked to sign a form to show you are happy with the work.
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.
Is it true that everyone in the UK is entitled to subsidised insulation?
Yes, everyone is entitled to a subsidy and some people can even have free installation. Why? Because the UK Government is obligated to reduce greenhouse gas emissions by international environmental agreements. One of the easiest ways to achieve a large reduction in greenhouse gas emissions is through increased home energy efficiency. The Government has stated that cavity wall insulation and loft insulation are the most effective methods which is why they have legislated for power/energy utilities and power companies to provide subsidies.
I already have some loft insulation - do I need to install more?
If your loft insulation is 100mm or less you would certainly benefit by having it topped up with more insulation to make it up to a 270mm thickness. The Energy Saving Trust estimates that top-up loft insulation can save the average householder as much as £60 per year at current energy prices.
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