Gluing facing bricks, unheated calcium silicate stone

If you line an unheated room from the inside with Styrodur, you have actually already placed the dew point inside the wall and shifted it outward towards the plaster. You want it to be warmer inside than outside, otherwise you wouldn’t want to insulate from the inside. Where warm and cold meet, moisture forms. If it absolutely has to be bricks on the inside, I would lay them in unreinforced mortar in a thick bed (unreinforced = without plastic and resins), preferably natural stone and rough without grouting. If it’s about getting warmer, I would consider calcium silicate boards and treat them only mineral-based. Good luck Gabriele

Hello fach1werk

I did not express myself correctly.
The strips are supposed to go on the outside of the wall. The insulation is also not primarily intended as such. Simply to straighten the wall (without plastering) and to have an ideal base for the strips.

Steven