Roof Insulation

The type of insulation you should choose will depend on the type of roof you have. Use our category filter or browse our huge selection of brands to find your product. We are available by Live Chat, phone 020 3582 6399 or by email at to help you find the perfect solution - Free Delivery on all orders over £300 - Hassle Free Return Policy

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Why Insulate your Roof?

It has now become very common to insulate a house to save on energy consumption. However, most house owners overlook the need of insulating the roof. Heat can escape through your roof, and to prevent this issue, you must not neglect to insulate your roof space. The roof space of every house is different, and you use it for various purposes. In some houses, it is just a space beneath the slates or tiles used for storage, while in others the space could even be used as an extra room in the house. Either way it is important to insulate the roof to prevent heat loss and condensation build-up. Choosing the correct Insulation and using the right materials and techniques will help reduce the leakage of air from your loft. Preventing Condensation build-up saves your possessions from severe water damage.

Incorporating ventilation into your insulation system is also very beneficial in preventing condensation, caused due to water vapor. The condensation may also damage the timbers of the structure which over time can be very serious and expensive to repair.

Roof Insulation Thermal Performance

K-value is the major indicator of thermal performance level of your chosen insulation component. While this K-value is lower, your insulation product has better capability of retaining heat. U-value is another factor which indicates the heat flow through insulating materials. This U-value can be a minimum of 0.16 W/m²K, and you may try to optimize this U-value in various ways. For instance, you may look for Sheep’s wool insulation, and its K value is also 0.038 W/mK.

To have the right K-value, you have to apply multiple insulating material layers with batts or quilts. Each of the layers can be at a right angle to each other for the reduction of gaps. You may also insulate the pipes present in your loft. Continue this insulation layer over your water tanks also. For better thermal efficiency, you can lay several insulation layers upon each other. Also do not forget to use downlighter covers over your downlighters if you have them. Laying insulation over your light fittings can cause the light fittings to overheat and possibly go on fire.

There are various ways, in which heat passes through your roof. Conduction is one of the ways for heat transmission. To controlling it, you can raise the R-value of the insulation element and roof assembly. Extruded polystyrene and polysio have a very high thermal value per inch. With convectional style heat transfer, you can remove any insulation air gaps.

Identify your Roof Type and Choose the Correct Insulation Product

The presence or absence of a roof slope is one of the major aspects to consider when choosing insulation products. Your house may have a flat roof or a pitched roofing structure. The insulation type for these two roofs can to be different.

Flat Roofing

With flat roofing, you have two major options - Cold Deck and Warm Deck insulation.

Cold Deck - The insulation has to be just below the joists and the deck. Make sure that there is a gap available for ventilation and for preventing condensation.

Warm Deck - The insulation board is present above the deck. You can choose this option in the cold and damp sites.

Pitched Roofing

With pitched style roofing, you have two major options - Cold loft and Warm Loft insulation.

Cold Loft - this is one of the lower-priced roof insulation options. This involves placing the insulation right above your home’s ceiling. This prevents the escape of heat from your living space but does not protect the attic space.

Warm Loft - This is another insulation option for pitched roofing which involves installing insulation directly beneath the roof. This insulation protects the entire building including the attic space. You can buy insulation rolls for insulating pitched roofs. However, ventilation is a must for warm loft insulation.

Insulating the Rafters

Some homeowners focus on rafter insulation. For this style of insulation, you have to take the measurement of space available between your rafters. Then you cut your insulation panel to fit. You can insulate the pitched roof above or below the rafters. Permeable insulation is the right option for the older houses. However, If you have appropriate ventilation, you can invest in the non-breathable version.

Insulating the Ceiling of your House

This is the most common insulation solution for homes with a pitched roof and an attic space. It involves laying insulation across the attic floor. The amount of insulation needed for ceiling insulation depends on the climatic factors of the region.

Here at Insulation4Less, we hope this has aided you in making a more informed decision on what roofing insulation is right for you!

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