Why it is impossible to put plaster directly on polyfoam

Polyfoam is a porous substance that, to preserve its technical and visual characteristics, requires additional protection. Plaster can handle this function. The catch lies in the fact that it is impossible to apply the composition directly to the surface, because the materials do not have the proper level of adhesion to each other.

To ensure high-quality and durable coating, it is necessary to carry out work in stages and use additional elements.

Styrofoam plastering: stages of work

To begin with, it is worth saying that ordinary putty is not suitable for processing polystyrene foam. For these purposes, special compounds should be purchased, which can be found in the assortment of construction stores.

A strong reinforcing mesh is fixed on the surface of the installed insulation sheets. Its weight should be small, because otherwise it will be able to deform the structure.

After installing the fittings, you can begin to apply the first layer of putty. It should be uniform. After distributing the putty, you need to wait until it is completely dry and proceed to grinding.

Primer of the surface before applying the decorative coating - if this is provided by the project, occurs only after the surface is polished. Only in this case will it be uniform.

What to look for

In the process of performing work, it is necessary to use special mixtures that are suitable for processing polystyrene foam. Also, do not save on the purchase of fasteners and reinforcing mesh.

If you follow the established rules, plastering a wall insulated with foam sheets can be done without the help of professionals.

What you need to know when insulating walls with foam

Many consumers mistakenly refuse to insulate the walls with polystyrene foam, considering it toxic and combustible. It is combustible, but its ignition temperature is several times higher than the temperature at which the wood ignites.

Also, some consumers believe that this material is not a good option for insulation. Indeed, after installing the foam sheets on the walls, the room will not become warmer, however, it will not allow warm air to quickly go outside, which means that the rooms will warm up faster.