Than to fix a mounting foam - why is it necessary?
The secret of popularity of this material lies in its composition, as well as in performance characteristics. Mounting foam is a polyurethane foam sealant, the main components of which are polyol, as well as isocyanate. Manufacturers also add a variety of auxiliary substances: a blowing agent, a stabilizer, a catalyst, etc.
The main characteristics of the foam are: adhesion, output volume, viscosity, primary and secondary expansion. The composition of this building material is divided into two-component and one-component mixtures. In addition, foam can be professional and household, summer, winter and all-season.
But few know that this multifunctional material itself requires protection. Sunblock and moisture have a harmful effect on the mounting foam. Manufacturers do not forget to specify this on cans with foam. Maybe users read these recommendations, but do not know what to fix the mounting foam.
The solution is simple, the processing of mounting foam with paint, sealant, putty or special materials will avoid future sad consequences. If the protection is not carried out, then it begins to crack and dye under the influence of moisture and sun.
Of course, this process also takes time, but rather short, about 4 years, and after this time the construction seams in your building will lose their thermal insulation properties. Under the influence of changes in temperature, moisture and sunlight, the porous body of the foam loses its thermal conductivity,does not possess hygroscopicity and eventually completely collapses.
How to protect the mounting foam?
Thus, protection of this material is vital, so that it retains its properties and does not have to do frequent repairs. Before coating the mounting foam with a sealant or putty, it is worth trying a specially produced PSUL for these purposes( pre-compressed sealing tape).
This tape is used to fill irregularities in the opening when installing new structures. The old constructions are better protected with a membrane-type diffusion waterproofing tape.
In addition, the protection of the mounting foam is carried out by :
- with the finishing plaster or the putty, the mandatory condition is resistance to negative temperatures;
- solution consisting of cement, sand and white grout;
- with polyurethane sealant;
- with acrylic paint;
- with liquid plastic;
- window putty and other.
Before puttingtying the mounting foam, you need to prepare tools: a knife, a container for mixing the solution, a trowel and gloves.
Some practical tips for the protection of
foam Before plastering the mounting foam, it is necessary to cut the excess of dried material from the outside of the window or door blocks, etc. .If the putty is used for protection, then the outer seam should be deepened a few millimeters, if the sealant, you can limit the cut without deepening. The surface of the frozen foam should be leveled.
Many novice masters often wonder, what to do with plastering the mounting foam? As already mentioned above, it can be any frost-resistant putty, which is sold in construction stores. It is sold as a dry mix, in which you need to add the right amount of water to obtain a special solution.
After preparation of the mortar, it should be applied to the surface to be repaired and leveled. If the putty is applied with a very thin layer, then when it dries it can crack, so it is desirable to apply this finishing material with a layer of at least 3 mm.
After complete drying of the finishing material, the working surface is rubbed with sandpaper or a construction mesh, to remove roughness and to give the seams aesthetic appearance.