Loft Insulation

Insulating your loft, attic, or flat roof is a simple and effective way to reduce heat loss and reduce your heating bills. Whether you go for the roll or slab options, loft insulation products work essentially the same way as a puffer jacket would for you in the winter. The fibres in the insulation trap heat where you want it to stay reducing heat loss and adding a greener saving to your bills.

Depending on your loft space, you might also choose to place insulation within your walls or floor, to reduce heat loss through other parts of your loft. Some of our available products are specially designed to provide heat and acoustic insulation, like the Superglass Multiroll 44 and the Knauf Earthwool Loft Roll 44 Combi-Cut. Others are designed to provide one type of loft insulation – either acoustic or thermal - but will provide an element of the other despite not being specifically designed for that function.

Some of our loft insulation favourites are the Isover Spacesaver Combi-Cut and Knauf Universal Slab RS100 products, designed to be used for thermal insulation, however, the additional padding they provide in roofs, walls, or flooring will naturally reduce the amount of sound coming into the loft and overall building. Other items you might find useful are the various building board options we have available and the downlight protection hoods, which will assist in making your loft space a more functional and fire-safe area.

Browse our range of loft insulation below and if you have any questions please get in touch with one of our experts via Live Chat. Alternatively, to learn more about loft insulation, you can read our handy guide.

Knauf Earthwool Loft Roll 44 Combi-Cut - All Sizes
Vendor
Knauf Earthwool
Regular price
from £15.82 £18.98
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from £15.82 £18.98
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Knauf Earthwool Acoustic Roll - All Sizes
Knauf Earthwool Acoustic Roll - All Sizes - Knauf Earthwool Insulation
Vendor
Knauf Earthwool
Regular price
from £26.12 £31.34
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from £26.12 £31.34
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£0.00
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Knauf Earthwool RS60 (600mm x 1200mm) - All Sizes
Vendor
Knauf Earthwool
Regular price
from £311.36 £373.63
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from £311.36 £373.63
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Knauf Earthwool Flexible Slab (All Sizes) 1200mm x 600mm
Knauf Earthwool Flexible Slab 600mm x 1200mm - All Sizes - Knauf Earthwool Insulation
Vendor
Knauf Earthwool
Regular price
from £337.79 £405.35
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from £337.79 £405.35
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Knauf Frametherm Roll - All Sizes
Vendor
Knauf Earthwool
Regular price
from £1,080.51 £1,296.61
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from £1,080.51 £1,296.61
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Knauf Earthwool OmniFit Slabs (All Sizes)
Knauf Earthwool OmniFit Slabs (All Sizes) - Knauf Earthwool Insulation
Vendor
Knauf Earthwool
Regular price
from £24.71 £29.65
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from £24.71 £29.65
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£0.00
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Knauf Earthwool RS100 (600mm x 1200mm) - All Sizes
Vendor
Knauf Earthwool
Regular price
from £455.15 £546.18
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from £455.15 £546.18
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Knauf Earthwool RS45 (All Sizes) 600mm x 1200mm
Vendor
Knauf Earthwool
Regular price
from £275.11 £330.13
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from £275.11 £330.13
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Knauf Earthwool Timber Frame Party Wall Slab (All Sizes)
Vendor
Knauf Earthwool
Regular price
from £1,636.60 £1,963.92
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from £1,636.60 £1,963.92
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Knauf Earthwool SteelTherm Roll 40 (All Sizes)
Knauf Earthwool SteelTherm Roll 40 (All Sizes) - Knauf Earthwool Insulation
Vendor
Knauf Earthwool
Regular price
from £1,021.79 £1,226.15
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from £1,021.79 £1,226.15
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Knauf Earthwool RS140 (600mm x 1200mm) - All Sizes
Vendor
Knauf Earthwool
Regular price
from £348.83 £418.60
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from £348.83 £418.60
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Knauf Earthwool DriTherm 34 (All Sizes)
Vendor
Knauf Earthwool
Regular price
from £588.94 £706.73
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from £588.94 £706.73
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£0.00
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Knauf Frametherm Slab - All Sizes
Vendor
Knauf Earthwool
Regular price
from £809.53 £971.44
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from £809.53 £971.44
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Knauf Earthwool OmniFit Roll - All Sizes
Vendor
Knauf Earthwool
Regular price
from £944.68 £1,133.62
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from £944.68 £1,133.62
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Rockwool Roll 150mm (4.38m2)
Vendor
Rockwool
Regular price
£47.53 £57.04
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£47.53 £57.04
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Rockwool Roll 170mm
Vendor
Rockwool
Regular price
£753.47 £904.16
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£753.47 £904.16
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Rockwool Twin Roll 100mm (6.60m2)
Vendor
Rockwool
Regular price
£41.48 £49.78
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£41.48 £49.78
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100% Sheepwool Insulation Premium Roll (All Sizes)
100% Sheepwool Insulation Premium Roll (All Sizes) - Sheepwool Insulation
Vendor
Sheepwool
Regular price
from £70.79 £84.95
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from £70.79 £84.95
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£0.00
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100% Sheepwool Insulation Optimal Roll (All Sizes)
100% Sheepwool Insulation  Optimal Roll (All Sizes) - Sheepwool Insulation
Vendor
Sheepwool
Regular price
from £61.43 £73.72
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from £61.43 £73.72
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£0.00
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100% Sheepwool Insulation Comfort Roll (All Sizes)
100% Sheepwool Insulation  Comfort Roll (All Sizes) - Sheepwool Insulation
Vendor
Sheepwool
Regular price
from £48.56 £58.27
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from £48.56 £58.27
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£0.00
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Promat Masterboard 6mm x 1220mm x 2400mm (50 Boards)
Promat Masterboard 6mm x 1220mm x 2400mm - Promat
Vendor
Promat
Regular price
£2,253.00 £2,703.60
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£2,253.00 £2,703.60
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Promat Supalux 1.22m x 2.44m - All Sizes
Promat Supalux 1.22m x 2.4m - All Sizes - Promat
Vendor
Promat
Regular price
from £4,300.72 £5,160.86
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from £4,300.72 £5,160.86
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Isover Spacesaver Combi-Cut - All Sizes
Isover Spacesaver Combi-Cut
Vendor
Isover
Regular price
from £19.26 £23.11
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from £19.26 £23.11
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Danosa Danopren TR XPS Insulation 600mm x 1250mm - All Sizes
Vendor
Danosa
Regular price
from £34.12 £40.94
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from £34.12 £40.94
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Round Thermahood Downlight Cover
Vendor
Thermahood
Regular price
£5.75 £6.90
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£5.75 £6.90
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£0.00
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Rectangle Thermahood Downlight Cover
Vendor
Thermahood
Regular price
£6.50 £7.80
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£6.50 £7.80
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Square Thermahood Downlight Cover
Vendor
Thermahood
Regular price
£6.50 £7.80
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£6.50 £7.80
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£0.00
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Superglass Multiroll 44 - All Sizes
Superglass Multiroll 44
Vendor
Superglass
Regular price
from £15.97 £19.16
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from £15.97 £19.16
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£0.00
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MuteFoam Self-Adhesive Acoustic Foam - 2000mm x 1000mm x 25mm
Vendor
iKoustic
Regular price
£63.54 £76.25
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£63.54 £76.25
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£0.00
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Forgefix Loft Leg (Box of 12) - All Sizes
Forgefix Loft Leg (Box of 12) - All Sizes - Forgefix Building Materials
Vendor
Forgefix
Regular price
from £12.32 £14.78
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from £12.32 £14.78
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Forgefix Loft Light 125mm x 110mm x 80mm
Forgefix Loft Light 125mm x 110mm x 80mm
Vendor
Forgefix
Regular price
£17.40 £20.88
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£17.40 £20.88
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Forgefix Loft Ledge 530mm x 530mm
Forgefix Loft Ledge 530mm x 530mm - Forgefix Building Materials
Vendor
Forgefix
Regular price
£9.50 £11.40
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£9.50 £11.40
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A Guide to Loft Insulation

Heat Loss through Uninsulated House

A quarter of heat is lost through the roof in an uninsulated home. Insulating your loft, attic or flat roof is a simple and effective way to reduce heat loss and reduce your heating bills. Our loft areas are always empty or sometimes used for storage purposes, but birds only sit on the insulated roofs where they can find the heat from below. The most important things about lofts are that they can be quickly turned into a space for use. Therefore, insulation is the only way that one can make it happen. The insulated house has a very warm and cosy environment as there is no loss of heat and one can live in comfort. Sustaining heat is one of the most important functions of Loft insulation. It is a very easy process to install loft insulation roll, and one can do it cost-effective as well.

Loft Insulation Roll

Why do we need loft insulation?

Most homes without insulation face problems such as heat loss and condensation. Without proper loft insulation, a lot of the warmth produced by your heating system escapes through the roof of your property; in fact, as much as 25% of the heat in an uninsulated house is lost in this way. Loft insulation acts as a barrier, slowing the movement of heat out of the property during the winter and into the property during the summer. It is an excellent way to save money and energy as Loft insulation is comparatively cheaper than other sorts of internal wall insulation. One can have a lot to do from the various designs, shapes and sizes to fit in the walls. The kind of insulation that you require will depend on the wall and space your house has. Loft insulation is necessary for houses in colder areas.

Signs of Under Insulated Loft

How to Install Loft Insulation Roll with Rockwool Thermal Insulation Roll?

Where should I fit the Insulation while insulating my Loft?

Insulating a Loft Between the Rafters

If insulation is placed exclusively between the rafters, they will have to be very deep to ensure you can fit the required depth of insulation (the very best phenolic foam insulation will have to be 125mm deep to meet Building Regulations requirements). With this installation method, there is a danger of minor condensation caused by cold bridges at the position of the rafters. This moisture could lead to discolouration of the internal decoration.

Fitting Insulation Over the Rafters

Fitting a continuous layer of insulation over the rafters will solve the issue of cold bridging, but is only an option on new builds or renovations where the roof tiles are being stripped and relaid. Even then, the depth of insulation now required to meet the Regulations means that very large fascia boards and wide soffits are required.

Insulating Beneath the Rafters

This loft insulation method also solves the issue of cold bridging but can restrict the headroom. This problem can usually be designed out in a new build but may cause an issue when an existing roof is to be converted.

What is the Difference between Cold Roof Insulation and Warm Roof Insulation?

You create a warm roof, or a cold roof, simply by applying the layers of Insulation to the roof in a different order.

Warm roof and Cold Roof
  • A cold loft is where you insulate immediately above the ceiling of the top storey, so no heat from your home gets into your loft.
  • The warm loft is where you insulate immediately under the roof, which means your loft space is warm as well.

What are the Types of Loft Insulation?

There are several different types of loft insulation to choose from and a variety of loft insulation materials available:

Batt or blanket loft Roll

The most common form of loft insulation, this comes in rolls of rock, glass or mineral fibre (we use Earthwool by Knauf which is a really good environmentally friendly option), or else foil-backed felt. It's generally the cheapest option and good all-purpose insulation, especially for between joists.

Sheep Wool Insulation

If you are using sheep wool insulation you will get the added benefits of the material being able to absorb moisture as well and is a perfect material for loft insulation.

Rigid Insulation Boards

Rigid Insulation Boards also are known as Sheet insulation and insulated boards are more expensive than the wool, however, they offer double the insulating capacity (therefore where you would normally use 270mm of wool, you would only require 135mm of the insulating board). They can be cut to size using a saw to fit between the joists and also drilled to allow room for light fittings.

Blown-fibre

Blown fibre insulation must be installed by a professional. An installer will use specialist equipment to blow insulation material into the gaps that require it. Blown Fiber is certainly the cheapest way to go, the loft space itself will be very cold in the winter.

Loose Fill Loft Insulation

Insulating your loft floor using loose-fill is great as a top-up process for a pre-insulated space. It tends to be light material such as recycled newspapers and mineral wool, which can be spread to cover any gaps between the joists. You simply open the bags of insulating material and pour into any spaces that were previously lacking an adequate level of insulation. This process is a fairly simple do-it-yourself job.

Do I need to provide extra ventilation to my loft space if I insulate it?

That depends on whether it is adequately ventilated at the moment. Increasing the amount of insulation in the loft can lead to condensation of water vapour on any timber there. If your loft is not properly ventilated your installer will advise you and can install simple vents that will ensure adequate airflow through the loft.

What are the benefits of Loft insulation?

The heating and electricity bills will reduce to a minimum.

  1. Reduction in the Carbon footprint of your home.
  2. Constantly improves the energy efficiency of your home.
  3. It increases the value of your home.
  4. Preserve the warm temperature throughout.
  5. Easy to Install and has longevity.
  6. No matter how big your loft is, you can insulate it easily.

The installation cost of the loft varies according to the size and the material that is being used. The material is easily available in the market and you can easily insulate the loft by yourself. You can do it as long as you can easily get into your own space; there are no condensation, damp and leakage problems. If you are a DIY installer then it can take you more time than the professional, and you have to know the entire process thoroughly. There are many ways to set up your attics with insulators-

  • Firstly, you need to clear the old stuff and boxes out of the loft space.
  • Check for gaps and holes in any pipes and water tanks before.
  • Check for electrical wiring and whether it is a necessity and why you must take care of all the essential electrical points and wires that are stretched out.
  • You must get the right measurement for your loft and for that, you need the right amount of blanket insulation.
  • You have to unroll the loft insulation roll and make sure that that is laid down in between the joists. These rolls are usually 1140mm wide, and one needs to cut it. Use scissors and cut the material short for the appropriate length.
  • You have to create a second layer in the right angles. You will need 200mm wool if your first layer is 100 mm deep. This in total will bring the total layering to 300mm.

Can I Use my loft as a storage space?

This is a very common idea when one wants and plans to use their loft for storage space. Once you have insulated your loft correctly, you can literally store anything in there. Many times, we face the difficulty with things in the loft losing shape and turning bad. This can happen because of the weather and the environment of the attic. Too much cold and too much heat can affect the loft, and that may affect the things that were around. The idea is to turn the entire space to make sure that the room is productive, and one can easily make certain that all is done well. Keeping a check on the space while installing is the right thing to do because that is how one can make sure that how much material is required insulating.

How can one resist condensation in Loft?

Resisting condensation is one thing when you have a properly installed insulation. One must know that these insulators are just great when it comes to fireproofing and protection of sound. Condensation, on the other hand, leads to a certain loss of energy, and that is how one can make sure that frosting has a high possibility. One has to fix the right material against the condensation, and that is why they must make sure that all is done well and good. Wool, mineral and spray foam are the appropriate materials that can resist condensation. Condensation can majorly affect your houses and result in damps and leakages. Therefore, wall insulations are a very important solution against condensation build-up.

What is the Minimum requirement for Loft Insulation?

The actual regulations require that loft insulation should be at least 270 mm thick and must have good thermal properties. Building Regulations does not determine which material must be used but it stipulates what qualities it must possess.

How much does loft insulation cost?

Average Cost of Boarding and insulating a loft cost around £1500 and depending on the complexity of the job it will usually take around 3-4 days to complete. There are various other factors that you should consider will impact on the cost of insulation like the material you select, the size of the loft.

How Much money will Loft insulation Save?

Savings from Loft Insulation are significant. According to Energy Saving Trust, insulating your loft can knock around £225 a year off your energy bills in a detached house, and £135 in a semi. This means that in around two years, your insulation will have already paid for itself, and every year after, it’ll keep on saving you money.

If you are looking for internal wall insulation, acoustic or dry lining insulation, then you can choose from the options available at Build4less UK. All the products available are very reasonably priced, and the company has consistently kept it marked with quality services and products for the customers. If you are looking forward to getting the right insulation material for your homes, then this is where you must look for it.

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