When is regular foam better than "untwisted" EPS? I take the first steps in roof insulation and explain my choice.

Maybe it seemed to me that way, but ordinary polystyrene is not in great demand these days. And in practice I will make sure that this is excellent material, of course, in specific cases ...

So the next stage of construction of my house begins. Having insulated the foundation and the blind area, it is time to move to the roof.

But, before throwing the insulation between the rafters, there is a lot of preparatory work to be done. And it often happens that preparation takes longer than the main work.

Let's start with the roof overhangs.

The challenge here was to seal up these gaps between the wall and the roof.

Of course, this entire volume will be covered with insulation, which will be inserted between the rafters. And the task was reduced simply to making a barrier that would not allow stone wool to fall out.

But I didn't want to nail some boards there.

• First, you need to cut a lot.
• The second is to nail or screw in an inconvenient place.

So I decided to use expanded polystyrene for this.

Only not extruded, but ordinary (in common people, foam).

Now EPPS is shoved wherever possible, but for my tasks it is redundant. And ordinary foam will cope with this "with a bang."

• First, I cut the pieces to the correct size.

• Then, I attached these pieces to glue-foam.

It turned out that the foam was glued to both the wall and the Mauerlat.

• And I filled the rest of the space with polyurethane foam.

She, as an excellent fastener, holds the foam "more reliably than nails".

• In this case, the strength of the foam will be sufficient to withstand the slight pressure of rock wool.
• Also, the polystyrene additionally closed all the cracks in the Mauerlat and insulated it.
• And the price of this foam is several times less than that of EPS.

Of course, I didn't save much on such a small amount, but still ...

And one more important point.

It turns out that this foam is non-flammable.

I didn’t even think that this could happen, but it turns out that the foam with the marking "PSB-S" (or rather the letter "C") does not support combustion. While the EPS burns, and yet at the same time releases toxic substances.

So I have no doubt about my choice! Write your opinion in the comments, I will be interested.

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