Leca blocks and foam sealant

[midvinter]

A builder has constructed an exterior wall and installed a window.
The question is, there is no exterior plaster on the concrete blocks yet; it will be done by next summer at the latest.
However, we will insulate with stone wool on the inside in the coming weeks and build an interior wall.
Can the concrete blocks withstand the winter and spring without exterior plaster, and most importantly, is there a risk of moisture in the internal insulation?

The window frame is insulated with foam sealant. Foam sealant is not UV-resistant, and we won't install any trim until the exterior plaster is done, i.e., by next summer at the latest. Can it remain unprotected until then? Or how can one make a temporary solution?

Midvinter

 

[andersmc]

You need to protect the fogskum in some way. It becomes very brittle and crumbly if exposed to sunlight for such a long time. In the worst-case scenario, you can just tape it with duct tape or staple up strips of vindpapp.

 

[P-J]

Hang up a tarp, or do you want to be able to look through the window in winter?

 

[ktm250]

A lecablock has a very open structure, which means that if it is not plastered, air can blow straight through it. This implies that it has poor properties concerning: fire rating, U-value, sealing against moisture penetration.

 

[midvinter]

Ok thanks for all the answers.

I have talked to the builder, and he will plaster an exterior layer on the leca before we start with the internal insulation.

What do you think about this method:

leca, wind paper, 50 mm rock wool, plastic, and gypsum

It's regular lecablocks, not "insulated" lecablocks.

 

[midvinter]

No one knows how to build up the inner wall?
It is an uninsulated slab. Is it best to put a spacer between the bottom wooden stud and the outer wall? (Of course, the stud is a few cm up from the concrete floor.)