Attic insulation

externally or internally

Almost half of the heat loss of a house occurs on the roof, so your roof space will be more livable in winter and summer with the purfoam protection! As a result, the new insulation will be felt throughout the house.


Closed-cell or open-cell foam


Up to 100-150 m2/day on a walkable attic


From 3 cm up to 20 cm


Closed cell: 35kg/m3, open cell: 12kg/m3

Roof insulation

The profession unanimously agrees that purfoam is the most modern thermal insulation available today. By way of comparison, it should be mentioned that closed-cell foam is half as thick as traditional insulating materials. This advantage is particularly important in an attic, primarily due to the low interior height and small rafter thickness.

The insulation is completely continuous, airtight, there are no breaks or junctions. Closed-cell foam also provides waterproofing, so your attic will be doubly protected against getting wet.

In addition to the fact that the foam provides excellent insulation, the hardness of the material is also an important advantage, or the fact that closed-cell polyurethane also statically strengthens the roof structure.

Purfoam doesn't slip off like cotton, it doesn't mold, so its lifespan is several times longer than that of traditional materials available on the market. Polyurethane insulation has been used throughout Europe for about 80 years.

Finally, we would like to note that if you will not live in the attic and only use it for storage, it is recommended to insulate the attic floor instead of the roof plane - if you are interested in this, Click here!

Attic thermal insulation on the roof plane, from the inside

In the case of an uninhabited attic, if the roof plane is not covered with plasterboard or wainscoting, we insulate between the rafters, working from the inside. The closed-cell material can be used on foil, OSB board, wainscoting, but also directly on tiles. We recommend the latter if the tiles covering the roof are in good condition and you do not plan to replace them.

Closed or open cell foam?

The first thing that needs to be answered in relation to attic thermal insulation is whether to work with closed or open cell material. The closed-cell material is the best thermal insulation available today, plus it also provides perfect waterproofing. You will never have to worry about leaks caused by moving tiles or other defects, thus saving on repair costs. Since the material is rigid and strong, it also strengthens the roof statically. Another important advantage is that, in addition to waterproofing, polyurethane foam is vapor diffusive - that is, the humidity of the air leaves the living space. If you want more information, you can read about the closed-cell material HERE. 

The light and soft open-cell foam insulates heat, but does not stop water. We especially recommend it for surfaces where soaking is impossible and large hollow spaces need to be filled at low cost. If you are interested in more information about open cell polyurethane foam, click here!

Attic thermal insulation from the outside

If the attic is already inhabited, it is not possible to insulate the attic from the inside. In this case, the only way is to insulate from the outside, since the roof plane is already covered, its removal would involve great expense and upheaval. In order to solve the task, we arrive with our own carpenters and demolish and rebuild the roof below market prices. Instead of coordinating two contractors, taking the risk that the building will get wet due to poor coordination or a delay, you can manage the roof renovation more easily.

How shall we do it?

In order to gain access to the old insulation, we move between the beams and break the roof shell. If there is no insulation in the roof, after the partial production of the tiles and, if necessary, the battens, the foam is blown onto the boundary layer under the outer skin (foil, plasterboard, wainscoting, OSB board).

If there is cotton under the tiles, we will consult with the Customer about the fate of the old insulating material. In most cases, the cotton insulation has slipped and thinned, so we remove it. If the cotton still fulfills its function, it can complement the foam insulation as an extra layer. After the attic thermal insulation is completed, we will finally rebuild the roof shell.



Over the years, wool insulation slips and collapses, which is why the insulation becomes gappy

Wooldoes not provide waterproofing, in fact, it gets moldy from the water that gets in (but also from moisture)

It is not seamless, it is not airtight - cold or hot air can pass through it

Difficult installation, if you also consider the cost of the work, you will see that SPF is more competitive




The insulation is rigid and non-shape-following, so the board material cannot be installed precisely and without gaps. Thermal bridges are formed.

The insulation is not airtight, so air can pass through the gaps.

Polystyrene insulation does not provide waterproofing, so it can mold.


Even half the thickness is enough to achieve the same thermal insulation. There are no limits to the thickness of the rafters or the height of the attic!

Purfoam not only provides excellent thermal insulation, but also 100% waterproofing.

Eternal attic thermal insulation? Yes, it is possible with us!


Other uses

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What do you want to insulate?


Euro-Ker-Szig Kft.

4251 Hajdúsámson 

Debreceni út 24.

Send a description of the building you want to insulate, as well as the dimensions of the surface and the planned thickness of the insulation. We won't wait long, we will send you our initial offer for insulation within one working day without delay. If you find our prices acceptable, we will assess the building free of charge upon your request. 

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