Knowledge Base

What is PUR spray foam?

Spray polyurethane foam (a.k.a. spray, PUR foam) is a proven insulation material, mechanically applied to the insulated surface.

Spray foams are a modern insulation material with some of the best thermal insulation parameters. Crossin pur foam is a low-absorbing material that guarantees the maintenance of excellent thermal, moisture and acoustic insulation properties throughout the life of the house.

The spray application method of foam provides a seamless insulation layer, devoid of the so-called. thermal bridges.

Unlike traditional materials such as mineral wool, foam permanently bonds to the substrate during application and resists slipping and movement of the material over the years.

What are the types of spray foam?

Spray foams can have different structures. There are foams with closed-cell structure (otherwise rigid foam, hard foam) and pur foams with open-cell structure (otherwise semi-rigid foam, soft foam). With the structure of the foam is strongly related to the density. The more closed cells, the higher the density of the material. The structure has a significant impact on the application of the foam.

Open-cell pur foams are used in single-family housing, for insulating attics, ceilings, walls. They are excellent as insulation in frame houses.

Closed-cell foams are used for insulating warehouses, industrial buildings, agricultural buildings, halls and flat roofs.

In single-family housing, closed-cell foams are used as foundation insulation and floor insulation.

(according to EN 14315-1)

Class CCC1: < 20%
Class CCC2: Od 10% do 80%
Class CCC3: > 80% do 89%
Class CCC4: ≥ 90%

What is the typical use of spray insulation?

Spray insulation can be used both indoors and outdoors to insulate roofs, walls, floors and foundations.

In single-family housing, spray foam is an excellent material for insulating attics, walls, and ceilings.

Closed-cell foams are used to insulate foundations, floors, flat roofs, warehouses, industrial buildings and farms.

What are thermal bridges and how can they be located at home?

Thermal bridges (or thermal bridges) are places in the insulation layer where there is increased heat loss due to reduced thermal insulation properties due to, for example, joints. Thermal bridges arise, for example, as a result of the use of improper technology, incorrect installation or poor adhesion of one material to another (e.g., between the rafter and traditional insulation material, or as a result of flopping on the structural cords or slipping). The easiest way to observe the effects of thermal bridging is to unseal the window slightly in winter. Then you can feel with how much force the cold air enters the room. Thermal bridges can also be seen in the case of frozen rafters, which often give black vertical stripes on ceilings covered with plasterboard.

PUR foam insulation avoids thermal bridges. Spray foam allows it to be applied tightly even with complex roof structures. Permanently bonding with the substrate, it does not change its position over time, ensuring the tightness of the insulation throughout the life of the house.

Can spray insulation be used in old (historic) buildings?

The PUR foam spray method is widely used in renovation and insulation work, as well as in repair work. Due to the fact that it is an extremely airtight and durable solution that does not require the dismantling of the previous covering/material. In addition, the PU foam spray method is very popular for insulating brand-new buildings and spaces that rely on lightweight and durable solutions.

Does PUR spray foam absorb moisture?

The issue depends on the structure of the foam.

Open-cell foam absorbs moisture from the air, but also gives it back. It therefore performs well in rooms where moisture is relatively low, mainly pur foams are used as insulation in single-family housing.

In the case of Crossin Attic Soft foam, the short-term water absorption coefficient is one of the best on the market and is:

Wp ≤ 0,85 kg/m2

In the case of closed-cell foam, it absorbs very little moisture.

For example, the short-term soak factor for Crossin Wall foam is:
Wp ≤ 0,11 kg/m2

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