PUR foam insulation in which it exceeds the insulation with wool

PUR foam insulation in which it exceeds the insulation with wool

The most commonly used material for thermal insulation of the roof is mineral wool, but the PUR foam, applied by spraying, is becoming more and more popular. In what ways does it outperform wool?
Roof insulation
Steep roofs have the advantage that they must be insulated. This is achieved by using non-combustible, sound-absorbent and heat-resistant materials. Lightweight and quick to install materials, such as mineral wool, are very popular, especially in the construction of single-family houses. Recently, it has been increasingly replaced with PUR foam, which not only has the above mentioned features, but also has many other valuable properties.
Advantages of PUR foam
Polyurethane foam can be purchased in two forms: either as hard panels intended to insulate the roof slope from the outside, or as foam used for distribution by spraying from the inside. How does it differ from mineral wool? We will try to answer this question by recalling a few basic criteria on the basis of which we will be able to indicate the advantages of PUR foam.
Thermal insulation
In accordance with legal regulations, the thermal insulation layer of the roof should have a U-value not greater than 0.20 W/(m2K). Good quality mineral wool has a coefficient of 0.030 W/(mK), corresponding to 15 cm thickness. The same factor for closed-cell PUR foam is 0.021 to 0.024 W/(mK) and for open-cell PUR foam is 0.036 to 0.040 W/(mK), which corresponds to a thickness of 11.5 to 12 cm.
Weight and installation time
As for the weight, which is also important for the roof rafter framing load, PUR foam is much lighter than mineral wool, so it can be used even to protect less robust structures.
The installation time is also important. Applying PUR foam inside a building takes much less time than insulating a roof with wool.

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