Hello,
There has been some writing about this lately. I am planning an extension at home and in connection with that, I intend to plaster the entire house.
The extension will be a timber frame while the existing building is a load-bearing plank wall with 45+45mm additional insulation on the outside.
How should I avoid the problems that are being written about?
My plan for the extension is:
- timber frame + wind barrier + standing 28x70 + outdoor gypsum board and then 50mm of EPS + plaster
And for the existing building:
- plank wall + 45+45 insulation + wind barrier + standing 28x70 + outdoor gypsum board and then 50mm of EPS + plaster
The idea is that the 28x70 should become an air gap behind the plaster.
Can one somehow regulate the air supply in the air gap so that it has an insulating effect? If not, then the EPS becomes completely worthless as insulation.
Grateful for answers!
Best regards,
Tobbe Gårdner
There has been some writing about this lately. I am planning an extension at home and in connection with that, I intend to plaster the entire house.
The extension will be a timber frame while the existing building is a load-bearing plank wall with 45+45mm additional insulation on the outside.
How should I avoid the problems that are being written about?
My plan for the extension is:
- timber frame + wind barrier + standing 28x70 + outdoor gypsum board and then 50mm of EPS + plaster
And for the existing building:
- plank wall + 45+45 insulation + wind barrier + standing 28x70 + outdoor gypsum board and then 50mm of EPS + plaster
The idea is that the 28x70 should become an air gap behind the plaster.
Can one somehow regulate the air supply in the air gap so that it has an insulating effect? If not, then the EPS becomes completely worthless as insulation.
Grateful for answers!
Best regards,
Tobbe Gårdner
Byggnadsingenjör
· Skåne
· 1 458 posts
Hello Tobbe Gårdner!
SP (Swedish National Testing and Research Institute) has published a study this year showing that many houses with wooden frames, cellular plastic, and stucco have been affected by mold.
Therefore, they now advise against this type of construction.
They recommend instead that cellular plastic be completely avoided in connection with wood.
If you want stucco, you should do this on a special load-bearing, hard board attached to battens so that it is ventilated behind.
Inside this board, you make a traditional wooden wall consisting of windproof paper on the outside, wooden studs with insulation in between, plastic foil, wallboard (gypsum or similar).
If you want better insulation, you do this in the usual way by building on a wooden frame and insulating with mineral wool.
SP (Swedish National Testing and Research Institute) has published a study this year showing that many houses with wooden frames, cellular plastic, and stucco have been affected by mold.
Therefore, they now advise against this type of construction.
They recommend instead that cellular plastic be completely avoided in connection with wood.
If you want stucco, you should do this on a special load-bearing, hard board attached to battens so that it is ventilated behind.
Inside this board, you make a traditional wooden wall consisting of windproof paper on the outside, wooden studs with insulation in between, plastic foil, wallboard (gypsum or similar).
If you want better insulation, you do this in the usual way by building on a wooden frame and insulating with mineral wool.