Basement wall with wood wool

[Gustaf_mfl]

Hello!

We live in a townhouse from 1954 and are starting to plan a basement renovation. The inside of the exterior wall/basement wall is insulated with träullit. Then there's 1-2cm of plaster. The samples I've taken do not indicate any rot/mold, but I know that wood in the basement is not preferable. Does anyone have experience with this?

I see three options:
1. Tear out all the interior träullit and replace it with some other suitable insulation (iso/pordrän?)
2. Leave it as is to save time/money
3. Remove the lowest decimeters and replace with suitable insulation/plaster carrier.

What do you think?

 

[Liteavvarje]

Is there something wrong with the rendering on the träulliten, if not leave it be, why tear it down below, reason?

 

[AndersS]

If there is no moisture in the walls, there is no reason to do anything; it's the combination of moisture and wood that can cause problems. And if there is moisture, that is what should be addressed first.

 

[Gustaf_mfl]

Is there something wrong with the plaster on the träullit, if not, leave it, why tear at the bottom, reason?

I think it might be smart to remove it closest to the foundation/slab because there's the greatest risk of moisture there, I think.

 

[Gustaf_mfl]

If you don't have any moisture in the walls, there's no reason to do anything. It's the combination of moisture and wood that can cause problems. And if there is moisture, that's what needs to be addressed first.

Planning to drain on the outside, but in the long run, I want to remodel the basement with, among other things, underfloor heating. Even if we dig out and insulate under the slab, I think there might be a difference in moisture movements in the future.

 

[Liteavvarje]

If you are going to drain the house, the drainage should be under the slab and then nothing should come in below, so wait to do anything until you have drained.
It is dry now and it won't get wetter after draining.

 

[AndersS]

The house has träullit in some basement walls from the '60s. There was some moisture in the basement in two corners but not on the floor when we moved in. The drainage was perfect with clay pipes; however, the concrete pipes for the roof water were completely clogged with soil from what ended up in the gutters, and it was the roof water that was pushed out and caused moisture in the basement walls. Today, the basement is dry and the träullit remains in the wall, but there is also a layer of podrän as insulation on the outside. The work was done in '87.

 

[Gustaf_mfl]

Have a house with träullit in some basement walls from the 60s. There was some moisture in the basement in two corners, but not on the floor when we moved in. The drainage was perfect with clay pipes, however, the concrete pipes for the roof water were completely clogged with soil that had come from what ended up in the gutters, and it was the roof water that had been pushed out and caused moisture in the basement walls. Today, the basement is dry and the träullit remains in the wall, but also a layer of podrän as insulation on the outside. The work was done in '87.

Thank you!
I probably have the exact same construction. We have disconnected the concrete pipes for the roof drainage and instead direct the water out onto the property. So we should be fine there. I'll probably leave the träullit in place.

 

[Oldboy]

I can add that träullit is a (surprisingly) very moisture-resistant mtrl. Therefore, it is used, for example, in swimming pools. I think I've seen it outdoors as well, exposed to the weather and wind. Like in a fence at Heden in Gtbg.

 

[Fred vom Jupiter]

According to what I have read, Träullit should not be able to mold, and it is often used in moisture-exposed places.
Don't get hung up on the fact that the name contains the word trä.