Penoizol has several names. Scientific – urea-formaldehyde foam (UF). In addition, this insulation is called liquid or jellied polystyrene for its consistency during use, eco-insol; there are also brands Unipol, Mipora and Mettemplast on the Russian market. The manufacturer positions the latter option as an improved penoizol.
Penoizol technical characteristics:
- density from 5 to 35 kg / m3;
- thermal conductivity coefficient 0.028–0.047 W / m * K;
- flammability group G2, that is, the material is moderately flammable. After pouring, Penoizol is already considered as part of the entire structure of the building, does not support combustion on its own, slowly charring under the influence of flame;
- shrinkage does not exceed 5%, usually 3%;
- vapor permeability is 0.21–0.24 g / m * h * Pa;
- operating temperature range – from -50 to + 90 ° C;
- water absorption in 24 hours 6–8%;
- not afraid of insects and rodents.
In a liquid state, penoizol most of all resembles a white airy soufflé or shaving foam, completely solidifies after a few days, after which it has a fine-mesh structure.
If we compare the thermal insulation properties of penoizol, its 10 cm thick layer can replace a 2.5 m thick brick wall, 2.97 m thick concrete, 30 cm thick foam and 20 cm thick mineral wool.
The most important issue raised by penoizol is its safety. The scientific name of the insulation contains formaldehyde and this makes many homeowners wary. Disputes about this among scientists are still ongoing. Most experts are sure that with the correct production technology, penoizol is safe for the environment and humans..
Advice!When buying penoizol, ordering a house insulation service using this technology, be sure to ask for quality certificates and check the manufacturer’s honesty and reputation in the market. In this case, you can be sure of the safety of the material..
Three main advantages of penoizol over other heaters:
- Fast styling. Insulation of a house with an area of about 100 m2 takes one day;
- Low cost. Penoizol turns out to be a very economical insulation, its price is several times lower than that of mineral wool or expanded polystyrene;
- The ability to insulate an old building without destroying masonry and external walls.
Let’s talk about the insulation of old houses with penoizol in more detail. The technology looks like this: holes are drilled in the outer wall of the house in a checkerboard pattern, for example, with a perforator in the seams of the brickwork. The distance between the holes is up to 2 m. A hose is inserted into the hole through which the liquid foam is poured into the voids between the outer and inner walls. Pouring is carried out until the material begins to protrude from the hole, which is then sealed. As a result, there are no traces on the facade.
The convenience of the technology is that with penoizol it is possible to fill the voids left after another insulation, for example, glass wool, which was actively used in the past, has become unusable. It is possible to fill in insulation under siding, another facade finish, without destroying it.
In addition, penoizol can be used to insulate attic rooms, floors, directly on the construction site of a new house to fill voids in blocks or between brickwork, to fill the seams of partitions, to maintain the temperature in refrigerating chambers. Penoizol is also used in frame construction.
It is easy to check the quality of the penoizol offered to you: ask the manufacturer to blow a small amount of material as a sample. The composition should be white, homogeneous, not sediment, not decrease in volume. After 15 minutes, the primary solidification of penoizol should begin, after which you can slap it with your palm – it should not break through. After the sample has completely solidified, try to break it – in no case should it turn into dust, in the case of high-quality material you will have to make an effort, and a slight shedding is possible only along the edge. With light compression, the frozen penoizol should recover its shape.
As for the durability of this insulation, the manufacturers declare that it will last up to 50 years. The warranty is usually given for 25 years. However, there are reviews that after 5 years penoizol began to crumble into dust. In this regard, we again emphasize the need to contact trusted manufacturers, whose products have all the quality certificates..