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Insulate floor: materials & prices

A lot of heat can go to waste through the floor. It is therefore advised to have your floors insulated. Insulating a floor will lead to considerable energy savings, as a result of which your energy bill will be less expensive. In this article, you can discover suitable materials and prices.


Which materials are used for floor insulation?

There are several appropriate materials with which one can insulate a floor. Below, you can find some of the most frequently used materials:


insulate floor1) Floor insulation boards

Insulation boards are perfectly suited for floor insulation. A point of concern here is their resistance to pressure; you would do well by choosing floor insulation boards that can carry quite some weight. This is especially important when the floor is insulated from above (later in this article, you can read more about this method).

Insulating boards made of EPS, PIR and PUR are often preferred when insulating the floor with insulation boards.




insulate floor2) Insulate floor with polyurethane foam

By means of polyurethane (PUR) foam spray, one can quickly cover a surface with insulation. PUR insulation has a good insulating value. Moreover, polyurethane foam dries fast and it provides a tight seal.

Insulating the floor with polyurethane spray has the following advantage: there is no need to cover the pipelines with a levelling layer. Thanks to the foam, the pipes are immediately encapsulated.




insulate floor3) Insulating screed

Insulation screed contains – as the name suggests – insulating material. This subfloor fills all the corners, as a result of which you get a seamless insulation layer. As with polyurethane spray, a levelling layer is unnecessary as well.

Because the insulation value of insulating screed isn’t great, insulating screed is usually not considered a full-fledged form of floor insulation. It is best to combine this with another insulation material.


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Methods to insulate floor

There are different ways to insulate a floor:

1) Insulating the floor along the bottom is only possible if there is an attic or crawl space. As these rooms are barely heated, coldness rises to the heated rooms when there is no insulation. Moreover, heat from the living spaces might escape to the attic/crawl space as well. The advantage of this method is that there is no need to demolish the floor.

When insulating this way, one often uses rigid insulation boards. Think, for example, of boards that are made of PIR, PUR or EPS. In order to seal gaps, you can use polyurethane foam. Are there many pipes in your attic? It is advisable then to work with polyurethane foam anyway, as you can easily apply this around the pipes (as opposed to insulation boards).

2) Insulating a floor along the upper side, however, does require demolition work. Possible pipelines may hamper the job. In addition, you need to provide a new finishing layer after the insulation work is carried out. You may as well choose to apply insulation and a finish directly on top of the existing floor, but this will take up a lot of space. With this approach, the construction of the floor is an important point of concern. As the level of the floor will raise, the insulation layer should be as thin as possible in order to avoid problems with doors.

To limit the thickness of the insulation as much as possible, you would do well to opt for an insulation material with a good insulating value. Mostly, insulation boards with a high resistance to pressure is chosen. Polyurethane foam and insulating screeds are possibilities as well.


insulate floor


How much does it cost to have a floor insulated?

The cost of floor insulation depends on many factors. The choice of material, the method (insulate floor from above or below), the thickness of the insulation layer and the total surface influence the cost calculation. Also the level of difficulty has an important role to play in determining the price.

To have your floors insulated with insulation boards, you may expect prices starting from £15 – £20 per square metre. Do your prefer polyurethane spray? Then you will pay at least £21.5 per square metre. The same applies to the cost of insulation screed.

An insulation expert can tell you more about the best type of floor insulation for your situation. He will also tell you whether you qualify for government grants or subsidised installations. Do you want to insulate your floor and rely upon a craftsman? On our quote page, you can request informal quotes from professionals for free. Click here for more information.