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What is room in roof insulation?

Installing room in roof insulation could help you make huge savings on your annual heating bill and drastically reduce your CO2 emissions. Read more on exactly what it is, how it differs from loft insulation, and how you could get it for free.

What are the benefits of room in roof insulation?

Room in roof insulation is the perfect choice for those wanting to combine heat efficiency in their home with a new loft conversion project.

Rigid foam boards, usually made from polystyrene or polyurethane, are cut to size and fitted in between rafters and underneath plasterboard walls to trap the heat inside. This helps to cut your energy bills and CO2 emissions. 

If you’ve already converted your loft, you can still fit the boards afterwards. But this could mean removing the ceiling or removing re-roofing tiles. However, a much easier (and most likely cheaper) option is to add another plasterboard layer with the insulation underneath.

However, one negative with this option is that it may reduce too much headroom.

What’s the difference between loft insulation and room in roof insulation?

Room in roof insulation is often confused with loft insulation, when, in reality, it is a very different product and involves a very different installation process. 

Loft insulation involves laying insulation on the loft floor between the joists. This type of insulation, usually made from mineral wool, is the most common form of roofing insulation.

The downside of this type of insulation is that it is recommended to be around 270mm, which can make it difficult for the space to be used for storage or as an extra room, as the material may need to be left exposed.

Room in roof insulation solves this problem as it is inserted between the rafters and behind walls and plasterboard.

How does loft insulation work?

Can you install room in roof insulation yourself?

Unlike loft insulation, fitting room in roof insulation can prove to be a tricky undertaking, so it is recommended that a professional installer is appointed.

However, if you’re a dab hand at DIY, you may be able to tackle it yourself. It is important that you make sure that there aren’t any underlying issues before you start, such as damp, and that the space isn’t subject to any restrictions.

Are there any restrictions on room in roof insulation

There are a few restrictions to be aware of, which is why it could be worth carrying out a pre-installation survey.

Some of the specific requirements include:

  • The room must have fully accessible stairs leading to it. Attic ladders don’t count.
  • The room cannot be part of another storey as this doesn’t count as a room in a roof. 50% of the vertical walls shouldn’t be over 1.8 metres.
  • The room, particularly the rafters, needs to be adequately ventilated, to prevent condensation.
  • Your roof needs to be free from any damage including damp, mould, rot or flaking timbers. This could make it too weak to apply the insulation and could mean problems could be left to accumulate unseen underneath the plasterboard.

How much does room in roof insulation cost?

The cost of fitting room in roof insulation depends on the type of property, but usually falls between £1,500 and £2,700.

While this may be a little more expensive than other forms of insulation, it could well pay for itself when it comes to using it as part of an attic conversion, which will add value to your property.

A typical detached house will see annual savings of £225, while semi-detached properties can expect to save £135 each year.

Are there any room in roof insulation grants?

There are a number of room in roof insulation grants available that can cover either the total or partial cost of the fitting. The main ones are the Energy Company Obligation (ECO) grant, and the Green Homes Grant voucher scheme.

What are ECO Grants?

The Government’s Energy Company Obligation (ECO) is a government-backed energy efficiency scheme that obligates the UK’s big energy companies to help customers on certain benefits afford energy saving home improvements. As well as providing funding for a free boiler, it also covers a range of other energy saving measures. This includes room in roof insulation.

What is the Green Homes Grant Voucher Scheme?

The Green Homes Grant voucher scheme (GHGVS) provides vouchers for energy efficiency measures, including funding for room in roof insulation. It is split between those on low incomes and certain benefits, who can apply for vouchers that cover the total cost up to £10,000, and a general scheme that is open to everybody and provides grants that cover two thirds of the cost, up to £5,000.