Experiences with Fermacell in interior finishing

  • Erstellt am 2019-11-30 17:59:37

Winniefred

2019-11-30 17:59:37
  • #1
Hello dear forum community!

In 2017 we bought our old building built in 1921 and mostly renovated it. Unfortunately, at that time there was no time and no money to renew the interior plaster as well, so it was only repaired and the new electrical wiring was installed there. Now we want to catch up room by room on what we missed. The old plaster is still the original, following the motto "lots of water and sand also make a wall." It doesn't look bad, but also not good, and woe to anyone who wants to drill a hole in it, then half the wall comes towards you. The plaster is just too old.

The children's room of our younger daughter is to be done first. At the same time, the wooden beam ceiling (in this case: the floor) is to be leveled and made vibration-free with Fermacell dry screed panels. At the moment everything is still nicely moving when the kids jump around. Since we don't have an extra bedroom, the little one will sleep with the older one during this time and the conversion should therefore go as quickly as possible. Hence the dry options; also to avoid unnecessary dirt and to keep the whole thing as light as possible. The house is insulated from the outside with about 20cm plus approx. 2cm exterior plaster (around 1992), the brick walls are about 25cm thick plus approx. 2cm interior plaster (made of gravel, sand, water). So currently a total wall construction of 49cm. There are no mold problems, energy costs are very low. We want to remove the old plaster on the walls and the old slag in the floor structure, but that should be the only bigger dirt accumulation. The ceiling has already been suspended with new drywall.

We want to work on the 2 exterior walls with Fermacell composite panels and on the 2 inner interior walls with Fermacell gypsum boards. The electrical wiring is already new and will be reused. A radiator will be replaced and also the window sill (the window is already new). So more of an all-round job.

Who here already has concrete experience with these products? Especially in the Do-It-Yourself variant? What is your long-term experience especially on exterior walls regarding dew points, possible moisture, etc.? In the attic and in the bathroom and with a new interior wall we have fundamentally good experiences with drywall. We want to start the whole thing probably in spring. We want to re-lay the laminate then, I want to keep the door frame in place during the conversion and in the end the walls should be wallpapered again in a child-friendly way or with sprayed plaster, depending on the little girl's wishes. If all that goes well, the older girl's room is next.

Would be happy about experiences and tips!
 

Reudnitzer

2019-12-10 22:16:53
  • #2
I can't tell you anything about Fermacell on the walls, as we had a mold problem, so that was obviously out of the question for us. However, during the renovation of the veranda (which was long children’s room No. 2), we used Fermacell boards for the floor. Since it stands "on stilts," meaning it has no contact with the ground, we worked as follows there:
- Removed slag until it was a level surface (could not remove everything because the substructure is a barrel vault)
- Installed foil (you can omit this)
- Spread Fermacell filling on top
- Styrofoam insulation layer and underfloor heating elements on top (you can also omit this, for us under the veranda is the "outside world")
- Fermacell boards on top
- Finally, linoleum as floor covering
Apart from the linoleum floor, we were able to do everything ourselves without any problems

I can’t say anything about impact sound insulation; only cats live underneath, where they have their kittens, but as a floor, it has proven itself very well. Whether it will last 150 years like the original floor, I dare to doubt





 

Dr Hix

2019-12-14 19:56:36
  • #3
The plaster forms the airtight layer; if you remove it, you must install a vapor barrier.
 

Winniefred

2019-12-15 17:09:28
  • #4
Thank you for your answers! After much back and forth, we have now decided to go with plastering to be on the safe side on the exterior walls – and since I’m plastering 2 walls anyway, I might as well plaster all 4. It’s a bit too uncertain for us regarding moisture and such... even though plastering is initially more work. For the floor, however, we will still use Fermacell, as we have had good experiences with it in a small bathroom. Because vibration-free and more impact sound insulation are definitely needed on the floor.
 

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