Flat roof insulation

Flat roof waterproofing and flat roof thermal insulation can be solved in one step with sprayed foam. Purfoam roof insulation is unbeatable for modernizing old and new roofs 


Closed-cell foam + UV protection (Polyurea)


With one team 350 m2/day (3-5 cm)


between min 3 cm and max 20 cm


45-55 kg/m3 body density

Flat roof insulation

The use of closed-cell polyurethane foam in flat roof insulation is becoming more and more popular. Flat roof thermal insulation provides the highest efficiency, while also solving flat roof waterproofing. More and more architects are designing with purfoam roof insulation in connection with new construction projects. However, foam roof insulation is most often used on old, sagging flat roofs. A huge advantage of technology is that it is not necessary to dismantle and transport the old insulation (this would often be more expensive than making the insulation we offer). Purhab is versatile, and almost it can be used perfectly on any construction industry surface. Whether it is a bitumen, concrete or wooden closing slab, the foam roof insulation can be used effectively. The closed-cell foam is gap-free, which means that the risk of waterlogging and thermal bridges that weaken the energy of the building are eliminated. The material used flexibly follows the movements of the roof, it does not crack, so it is not necessary to install expansion strips.

If you would like to read more about closed-cell foam, click here!

If the foam layer is exposed to the sun for a long time, it is important to provide UV protection. We seal the insulation against the harmful effects of the sun with a polyurea-based paint. This top layer effectively protects the foam insulation and extends its life. If the Customer provides the purfoam with another covering layer (concrete, cold pavement, gravel bed, soil/green roof, flagstone), the flat roof insulation will be perfectly protected against the harmful effects of the sun. In this case, no separate protective layer is needed. 

Read more about the UV protective layer here!

Problems with traditional insulation materials 

Low-quality flat roof thermal insulation significantly increases heating and cooling costs.

Roofs often get wet due to outdated, tarry flat roof waterproofing.

Condensation may appear on the ceiling of the upper level.

Most traditional insulation materials cannot follow the movement of the building, which can lead to small irregularities and cracks.

The complicated layering system associated with traditional materials does not provide water and heat insulation at the same time. Tar roof insulation only ensures water tightness. An overcomplicated layering system contains more error possibilities. If the bituminous roof insulation fails, the dismantling and removal of the layers involves significant costs.

Rodents like to move into outdated insulation materials.


The best flat roof insulation is foam

Closed-cell polyurethane foam is twice as efficient as conventional insulating materials (0.023 λ [W/mK]). 

Applying even a minimum thickness of 3 cm guarantees 100% waterproofing.

Eliminates condensation and condensation problems.

Purfoam roof insulation can allow moisture to pass through to a certain extent, so the building remains breathable. 

The applied foam and the protective UV layer flexibly follow the movements of the building, so there are no dilatation problems.

Thanks to the simple layering, the chance of failure is reduced to a minimum.

It is not necessary to remove the old insulation during the insulation of the flat roof.

Rodents don't like foam roof insulation, and they can't find gaps where they can get in between the old insulation materials.

Flat roof insulation

Given that more than half of a building's heat loss is lost through the roof, flat roof insulation is of paramount importance. They often come to us just for the waterproofing/wetting of the flat roof, in which case we apply the foam roof insulation in the thinnest layer, 3 cm thick. Although this minimum thickness does not yet provide strong flat roof thermal insulation, even this 3 cm provides 100% waterproofing to the building. If flat roof thermal insulation is also a consideration, we will recommend a thicker layer. A 10 cm thick closed-cell foam insulation provides the same efficiency as a 20 cm thick traditional thermal insulation (e.g. cotton or step-resistant EPS).

Purfoam has been used for roof insulation in Europe for 60 years, and according to experts, it retains its effectiveness for up to 80 years. The polyurea UV protective coating that protects the foam is also extremely durable, if applied with proper expertise, it protects the flat roof insulation against environmental influences for decades. It is important to know that the protective layer is not recommended for long-term physical use. If the flat roof is used as a terrace, the Polyurea layer may be exposed to wear. In such a case, it is better to combine the foam with paving slabs, cold cover or protection with a gravel bed.

Are there any open questions? Click here to view the Frequently Asked Questions!

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Euro-Ker-Szig Kft.

Hajdúsámson, Debreceni út 24