Underfloor Insulation

Over 20% of total building heat loss is through the floor. Choose from our range of underfloor insulation and start saving money on heating bills today!

Underfloor insulation - Temperature Control

Nowadays, homeowners are only starting to understand and appreciate the importance of home insulation. Insulation is one of the best ways to make your house comfortable and to control the indoor temperature. Whether you have chosen a cold or hot insulation system, the immediate results are hugely beneficial. From the tip of your roof right down to the underneath of your floor, you can insulate all the parts of your house. So now let’s discuss some of the benefits of Underfloor Insulation.

Prevents Heat Loss and Access of Cool Air

Up to 15% of heat has a chance of escaping through your floor. In this case, underfloor insulation boards help you to solve the issue. This insulation is effective in retaining heat during the winter months. Some buildings have a crawl space which is even more of a reason to install underfloor insulation. Cool air can pass through the crawl space meaning your room could be filled with unwanted cold air.

Why use a Vapour Barrier?

Moisture problems are very common in wooden floors. If wet, they become stained or warped. For these types of floors underfloor insulation is the right choice. It protects the floors against condensation build up.

Insulation - not only ideal for the Winter

Most of us think that the insulation products are useful for the winter season only. However, during hot summer days underfloor insulation can prove most beneficial to you. If your house has a basement, the rising heat can start accessing your living space. Installing underfloor insulation can prevent the access of this unwanted heat.

Foil Sheets

Foil sheet insulation is very common for insulating underfloor spaces. It is well known for its advanced abilities of trapping air and vapour.

The cheapest solution for you

When trying to more accurately control the heat of a room people often turn to the use of AC systems. These simply add to your monthly heating expenses. Installing Underfloor insulation provides more control over the temperature of a room and helps lowers annual heating bills drastically.

R-value - the higher the better right? no.

The R-value of insulation indicates its level of effectiveness. A Higher R-Value means the more powerful the insulation is. For underfloor insulation, the minimum R-value has to be R1.4. Your property condition, climate and the building type are all major factors that come into consideration when identifying the right R-value for your insulation product. You may think that it is best to have insulation with highest R-value. However, it is not always essential. It is best to get an expert opinion before commencing with the installation.

Insulation batts for underfloor insulation

This product has become a very popular choice in underfloor insulation. The insulation batts remain pressed together between joists. Best practice is to then slung the straps across these joists for the best backup and support. You can invest in high quality and high-performance polyester insulation products which prevents any sagging issues that may arise down the line.

What Best Suits your Floor Type?

There are a huge range of different Insulation types and it is important that you pick the right one for your floor type.

Suspended Floor / Suspended Timber Floor - If you have a suspended floor, made of timber, a suitable choice of underfloor insulation would be polyester sheets or glasswool. Fit the sheets between your floor joists and you strap them securely. For optimum results you may use lining material.
In most older buildings, you can find suspended timber flooring systems. You can insulate these timber floors by raising the floorboards and laying the mineral wool beneath.


Concrete Floors - In some houses, concrete floors are present. The most popular concrete underfloor insulation choice is polystyrene board.

Underfloor Insulation - Things to Know

Placing a continuous insulation layer (polystyrene board) over a damp-proof covering will result in an increase of R-value by R0.2. The slab edges are the major source of loss of heat. Thus, insulation of slab edge is much more important than that of the slab underside. It is possible that your house may have waffle or conventional slab base. Polystyrene insulation is best choice for insulating it. However, the use of uPVC sheet at the outer part of this insulation panel is highly essential.

Here at Insulation4Less we aim to provide you with the highest quality insulation at the lowest prices. We hope this guide has helped you make a more informed decision on your insulation purchase.

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