Remove old Styrofoam interior insulation? Alternative insulating plaster?

  • Erstellt am 2017-12-20 13:19:16

patrikmueller

2017-12-20 13:19:16
  • #1
Good day!

In short:

    [*]House from the 1950s (24cm exterior walls)
    [*]Renovated in 1999 with 14cm external Styrofoam insulation
    [*]Partial internal insulation with 4mm Styrofoam boards under wallpaper
    [*]and partially painted 1cm Styrofoam boards

There is practically no wall without this dreadful Styrofoam on the walls.
Now I am afraid of possible mold growth because the average humidity is around 65%. I opened up a corner, but at least in this spot no mold was found.

What would you do? Remove the Styrofoam or leave it?
I am thinking of a mineral rolling plaster, but of course I would forgo the (albeit slight) internal insulation.
Is there actually mineral insulating plaster for interiors that can be applied with a roller?
 

lastdrop

2017-12-20 14:17:23
  • #2
Is there already mold? Or why should there suddenly be mold after 18 years?
 

Joedreck

2017-12-20 14:39:01
  • #3
So in combination with external insulation, internal insulation is usually unproblematic. Without insulation on the outside, the dew point shifts into the wall. The problem does not exist with correctly installed external insulation. However, the cm is rather secondary. So you can hold it like a roofer.
 

patrikmueller

2017-12-20 14:39:17
  • #4
Whether there is actually any mold behind the Styrofoam, I cannot say, in any case, nothing of it is visible on the outside. And also the one corner that I uncovered is clean.
 

Joedreck

2017-12-20 15:05:13
  • #5
I left it as it is with me. I also have external and internal insulation. If you want to be 100% sure, remove it. Otherwise, only consistent airing helps to keep the humidity low.
 

patrikmueller

2017-12-20 16:25:44
  • #6
Thank you for your feedback. I think I will open another wall to be sure.. just don’t know where.
 

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