Flat roof insulation

Water and heat insulation can be solved in one step with the sprayed foam. Equally unbeatable for saving old roofs, or for economical and quick insulation of newly built roofs. 


Closed-cell foam + UV protection (Polyurea)


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


between min 3 cm and max 20 cm


55 kg/m3 body density

Flat roof insulation

The use of closed-cell polyurethane foam during flat roof insulation is becoming more and more popular. It not only provides the highest efficiency in terms of thermal insulation, but also completely solves the waterproofing. All this can be done in one simple step, without the need for complicated layers, and yet economically.

Our most common task is to insulate old bitumen roofs. A huge advantage of the technology used is that it is not necessary to dismantle the old insulation, which would involve removing and transporting the insulation material (often the insulation itself would be more expensive).

More and more architects are planning with us for the insulation of newly built family and apartment buildings and office buildings. Closed-cell foam can be used without gaps and gaps, thus eliminating the risk of wetting and energetically weakening thermal bridges. The used foam material flexibly follows the movements of the roof and does not break, so it is not necessary to install expansion strips.

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

Thanks to the extraordinary adhesive power of the foam, it is perfectly fixed on almost any construction industry surface. Whether it is a bitumen, concrete or wooden closing slab, PU foam can be used effectively. Especially in the case of bitumen roofs, this solution means outstanding economy and efficiency.

If the foam is combined with a covering layer (for example, concrete, pavement, gravel bed, green roof, flagstone), the flat roof insulation will be perfectly protected without the need for a separate protective layer. However, if the foam layer is exposed to the sun for a longer period of time, it is important to provide UV protection. That is why we use a two-component Polyurea layer, which effectively protects against the harmful effects of the sun and extends the life of the insulation.

Read more about the UV protective layer here!

Problems with traditional insulation materials 

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

Due to outdated, tarry roof insulation, roofs often get wet.

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, also known as purfoam, provides extremely efficient thermal insulation compared to traditional insulation materials (0.023 λ [W/mK]).

Applying even a minimum thickness of 3 cm guarantees 100% waterproofing. Thanks to this, condensation and condensation problems are eliminated. The material is able to allow moisture to pass through to a certain extent, so the building remains breathable.

The foam creates an even surface without gaps or thermal bridges. Although it is a light material, it is still rigid and walkable. 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 purfoam, and they can't find gaps where they can get in between old insulation materials.

Flat roof insulation

Considering that more than half of the heat loss of a building is lost through the roof, the insulation of the flat roof is of paramount importance. They often come to us only with the problem of wetting, in which case we apply the foam in the thinnest layer, 3 cm thick. Although this minimum thickness does not yet provide strong thermal insulation, it already provides the building with 100% waterproofing. If thermal insulation is also a consideration, we recommend a thicker layer. For example, a 10 cm thick closed-cell foam insulation provides the same efficiency as a 20 cm thick traditional thermal insulation (e.g. cotton).

Purfoam has been used in Europe for 60 years, and according to experts, it retains its effectiveness for up to 80 years - it is no exaggeration to say that it is practically eternal. 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!

Flat Roof Closed Cell Purfoam Insulation

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Euro-Ker-Szig Kft.

Hajdúsámson, Debreceni út 24

1026 Budapest, Riadó u 2c