I tried sprayed insulation from a foam cylinder. My honest review
To insulate the ventilation ducts in the attic, I decided to purchase spray-on polyurethane insulation.
The thought was like this. I make a box from scraps of aerated concrete (I glue the elements with glue-foam) and spray thermal insulation inside the box. I know the consumption of foam in a bottle with real filling (more than one box used up glue-foam in the work). I thought that if it is a heater, then the foam from it will expand even more and the foam will be 2-3 times more in volume. Moreover, everything looks exactly like this in the store.
The foam comes out under high pressure, flies out of the nozzle at a distance of up to 20-30 cm. But the reality in terms of consumption turned out to be far from my assumptions.
I applied thermal insulation to the inside of two pass-through elements and to a small volume inside the box. And that's it, the balloon is over. Sprayed from the plastic spray that comes with the kit. An interesting alternative to a foam gun.
Perhaps due to the fact that I applied the foam cyclically, it did not turn out so airy and the resulting volume was less. I bought two cylinders. The second one was used for gluing a foam plastic shell when insulating ventilation ducts and for gluing a box of aerated concrete. Yes, the old method of insulating shells helps here too.
There is polyethylene foam insulation, but its thickness is insufficient. It is, in my opinion, designed to prevent condensation on the pipes.
With this foam I insulated the rest of the passages. The next day, I discovered that the aerated concrete in the box burst when this insulation expanded.
This is not critical for me, because boxes will be plastered. He froze the cracks and did not redo them.
In another store I met a sprayed insulation from another manufacturer. But there was no longer any need to experiment with him.
Only here the store decided to sell the spray nozzle separately.
My conclusion is this. The foam yield of this sprayed insulation is less than that of a conventional foam cylinder. The effect is achieved by a large expansion of the foam. Better to pay extra 100 rubles. and insulate with ordinary foam from a pistol. Which he did. For a report on the process of warming ventilation ducts, see the following articles.
If someone has used this sprayed insulation in cylinders - write your review. Maybe in my case, due to cyclic spraying, it is unprofitable to use a cylinder, but does it still have a decent foam output?
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