Going to paint and replace some bad planks on the outside of our 70s house. I've noticed that under the planks there are masonite boards (!) with small mold spots - do we need to replace them? How have you, with the same type of house, handled this, left them as is or...? Is it common to have masonite boards under planks?? :-/
Do you mean that it's outer facade, masonite, plastic, and insulation? Seems strange, there shouldn't be any plastic on that side, it should be after the insulation facing the room.
The masonite is probably a type of wind paper, you can have paper or outdoor drywall or probably also masonite.
An air gap wouldn't hurt! if you put up a new facade, because you're probably doing that if you're going to start replacing the masonite?
The masonite is probably a type of wind paper, you can have paper or outdoor drywall or probably also masonite.
An air gap wouldn't hurt! if you put up a new facade, because you're probably doing that if you're going to start replacing the masonite?
Hmm, I'm not really sure if I understand, but I've seen quite a few 70s facades with vertical battens and something masonite-like behind them. From a bit of a distance, it looks like a regular batten panel (i.e., as if the masonite were actually boards).
However, I interpret you as actually having a real panel, with masonite directly behind it. Nowadays, care is taken to ensure that the panel has ventilation behind it (using a nail batten) so it can dry properly between rains. If the masonite is against the boards, they can't dry, and that's why it has molded.
Any plastic should, as que points out, be on the warm side of the wall. If it's on the outside next to the panel, there's a risk that humid air will condense at the outermost part of the insulation, with a risk of mold.
However, I interpret you as actually having a real panel, with masonite directly behind it. Nowadays, care is taken to ensure that the panel has ventilation behind it (using a nail batten) so it can dry properly between rains. If the masonite is against the boards, they can't dry, and that's why it has molded.
Any plastic should, as que points out, be on the warm side of the wall. If it's on the outside next to the panel, there's a risk that humid air will condense at the outermost part of the insulation, with a risk of mold.
Ahem, this is how it should be (I blame being misinformed by the partner):
Cladding panel, hardboard (masonite), mineral wool, framework, vapor-tight plastic, building board.
I have now copied from the Technical description of this house, so now it should be correct......
Yes, back to the question; what to do? Can the da**ed masonite stay? We don't really need to replace the entire facade, just partially, so.......what do people do?? :-/
Cladding panel, hardboard (masonite), mineral wool, framework, vapor-tight plastic, building board.
I have now copied from the Technical description of this house, so now it should be correct......
Yes, back to the question; what to do? Can the da**ed masonite stay? We don't really need to replace the entire facade, just partially, so.......what do people do?? :-/
To be completely sure, the sub-board on the cover panel is placed directly against the fiberboard? If so, it will be difficult to do anything about this unless you change the entire facade, to get an air gap.
What you should do about the moldy fiberboard; replace the worst parts, some minor parts you might be able to just sand away. I believe there is a product that can be applied to affected areas to stop further mold growth, you can probably ask at the paint store.
What you should do about the moldy fiberboard; replace the worst parts, some minor parts you might be able to just sand away. I believe there is a product that can be applied to affected areas to stop further mold growth, you can probably ask at the paint store.
