Roof Insulation Cost UK: 2022 Price Comparison (per m2)

Roof insulation is really a prudently wise investment. A house loses 25% of its heat through a poorly insulated roof as heat rises. 

Roof insulation grants and the high cost of energy mean that you can quickly recover your investment.

You can select from a variety of roof insulation options based on the amount of space, your financial situation, and whether or not a roofing underlay is present. 

The most popular and the best roof insulation UK materials, their costs, and their qualities are listed below.

  • Fibreglass insulation
  • Spray foam insulation
  • Rock wool insulation

The simplest and most effective method for roof insulation is this one. It effortlessly seals any gaps, and you can even use it to insulate areas that are out of your reach. 

Spray foam insulation is made up of two parts that, when they combine, quickly expand and begin to produce foam. 

The cost of roof insulation UK is about £30 per square metre and must be done by qualified people.

Roof insulation is a luxury that will quickly pay for itself. 

When selecting the insulating material, don’t focus just on the purchasing price. 

Within a few years, you can already recoup the additional expense of improved roof insulation. 

It would be unfortunate to have to tear down the ceiling in a few years to add more insulation.

What are roof insulation costs in the UK?

Roof insulation frequently enables you to improve the energy efficiency of your home and lower your heating costs. Savings of up to £250 per year are possible with an additional layer of loft insulation. 

This indicates that it can be easily repaid within two years. Loft insulation cost UK sometimes involves applying different insulation product thicknesses in two separate layers. The second layer would be spread flat throughout the roof of the joists and insulation, with the first layer being positioned precisely in between joists in the roof space.

According to current standards, mineral wool or other blanket-type insulation should be installed in the loft at a thickness of at least 270mm.

Older installations of loft insulation would have utilised insulation no deeper than 100mm, whereas more recent installations have employed insulation up to a depth of 200mm.

Factors affecting roof insulation installation in the UK

A. Insulation Thickness 

Insulation should have a minimum thickness of 270mm for roof insulation. To surpass the 270mm limit, you might need to add one or two additional insulation layers, based on the depth of your existing insulation.

B. Access Problems

Small hatches or a lack of room are frequent features of lofts with limited access. Because of this, traditional loft insulation rolls aren’t as effective and must be replaced with a loose insulation material that is blown into the roof using specialised machinery. The roof insulation should be much simpler to operate in and ensure that all of the available space is covered by clearing out all of the clutter.

C. Location

The cost of labour is often higher for roof insulation in Britain and the southeast of England than it is in the rest of the UK. But, if you really want your loft to be a useful space, roof insulation is a sensible method to maintain heat in your house and reduce your energy costs. Depending on your specific needs, you can insulate your roof in a variety of methods at varying rates, so we have put together this article to provide you with an overview of the range of expenses you can anticipate.

Types of roof 

Roof insulation costs are influenced by a number of factors in addition to material selection. The surface, the depth of the insulating layer, and the degree of difficulty all play a role. 

The insulation can be installed either inside or outside. Insulation can be added to a flat or sloped roof using either method. 

The cost of insulating the roof’s exterior versus interior is higher.

Pitched roof

Insulation is typically laid on the inside of a slanted roof when one is present. The insulation can, however, occasionally be installed outdoors; this is known as a “sarking” system. Given that the interior finishing is unaltered, this alternative is particularly intriguing in the case of renovations.

Flat roof

When your roof is flat, you take a different strategy. A supposedly cold or hot flat roof is an option. Insulation is applied beneath the roof covering and the roof structure to insulate a cold flat roof from the inside. 

This approach is particularly used on existing flat roofs that are limited in height. Because a chilly roof has several drawbacks, many people choose for a warm roof. The insulation is then put on the exterior of the joint construction in that scenario.

Various materials for insulating roof

You can select from a variety of roof insulation options based on the amount of area, your financial situation, and whether or not a roofing underlay is present. The most popular materials, along with details about their costs and characteristics, are listed below:

  • Spray foam insulation

Polystyrene insulation panels with a foil backing that is trimmed to size, mineral or fibreglass lagging that is fixed in place with wooden slats, or expanded polystyrene products that unfold to fill the space are examples of materials that are frequently utilised. In many cases, a spray foam material can also be employed. 

Since spray foam roof insulation cost UK high in the UK and at least £30 per sq. meter plus the insulation panels, the most popular type of roof insulation, typically cost about £25 per square metre, the average cost of roof insulation for a property is roughly £400 to £500.

  • Fibreglass insulation

One of the most popular types of insulation for roofs is glass wool. It is inexpensive, lightweight, and has a high insulating value. Only a roofing underlay makes it possible to use glass wool insulation. Additionally, a vapour barrier should always be used to complete the interior. This will prevent the insulation from absorbing moisture from the room.

  • Insulation panels

If you wish to make the most of the area under the roof, insulation panels are the finest option. They already exist with a 1.5 inch thickness and have a great insulating value. You can also use specific boards that stop water and direct it to the below the roof when there isn’t an underlying roof. The vapour barrier can be quickly and easily sealed with specialised aluminium tape.

  • Rock wool

Rock wool is able to absorb sound better than glass wool since it has a little higher density. This kind of roof insulation is created by melting volcanic rocks and spinning them into a wool-like material. Rockwool is particularly well-known for its Delta boards, which, thanks to their triangular shape, fit the roof perfectly.

Additionally, a house would not be much of a house without the need for a roof to keep out the storms, but because they are the initial line of defence against pelting rain and rainstorms, they are particularly vulnerable and require special maintenance to remain in good condition. 

Before you begin creating preparations for roof insulation, you will want to understand how much it will cost to replace or fix your roof, whether you require a new flat roof for your garage or only a few tiles replaced. 

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