I've tried to clarify the difference (if any exists) between ASFA and ASFALT board!? Is it just an abbreviation or is there any difference between these two "products"?
Furthermore, I wonder if it is the best material to use as a blind floor for a self-ventilated crawl space?
Thanks in advance!
Furthermore, I wonder if it is the best material to use as a blind floor for a self-ventilated crawl space?
Thanks in advance!
As far as I know, it's the same thing.
I wouldn't recommend it for blindbottens. I don't have any real evidence for that other than it feels a bit too weak. I used trossbottenskivor. These are 6mm thick oil-hardened masonite boards. The width of these boards is 550mm to fit between floor joists cc60.
I wouldn't recommend it for blindbottens. I don't have any real evidence for that other than it feels a bit too weak. I used trossbottenskivor. These are 6mm thick oil-hardened masonite boards. The width of these boards is 550mm to fit between floor joists cc60.
No, it is not suitable, it is considered outright inappropriate. Asfaboard apparently has a tendency to mold when used as a subfloor. Use subfloor boards according to the post above.hanpatoppen said:
Thanks for the tips!
Is the following "layer division" sufficient from the top down:
1. 28mm råspont
2. Insulation
3. Trossbottenskiva
...or are boards also needed nailed to the floor joists to "support" the trossbottenskivor?
Is the following "layer division" sufficient from the top down:
1. 28mm råspont
2. Insulation
3. Trossbottenskiva
...or are boards also needed nailed to the floor joists to "support" the trossbottenskivor?
On the underside of the floor joists, you install a trossbottenbräda (22x95 or 22x120). This way, you get a shelf on each side of the gap to place the trossbottenskiva on. It's good if it's tight to reduce the risk of mice. At the joints, you place windproof paper.
I would say the following layers are "the usual" (from the top view):
Surface layer
22mm Floor chipboard
Moisture barrier
Insulation/floor joists
Windproof paper
Trossbottenskiva
Trossbottenbräda
This obviously depends on what you intend to use the space for.
Check out www.byggbeskrivningar.se The descriptions "Enkelstugan" and "Enkelboden" I think address this.
I would say the following layers are "the usual" (from the top view):
Surface layer
22mm Floor chipboard
Moisture barrier
Insulation/floor joists
Windproof paper
Trossbottenskiva
Trossbottenbräda
This obviously depends on what you intend to use the space for.
Check out www.byggbeskrivningar.se The descriptions "Enkelstugan" and "Enkelboden" I think address this.
I used asfaboard when I renovated one of my crawlspaces a few years ago, no signs of mold yet. In my other crawlspace, there is some form of asfabord too; it's been there since the 50s-60s, and there are no signs of mold there either! But, of course, it depends on how much moisture problems you have in your crawlspace.
I don't think a moisture barrier under the chipboard is a good idea as you can't glue the chipboard to the joists, which significantly increases the risk of the floor bouncing.
I don't think a moisture barrier under the chipboard is a good idea as you can't glue the chipboard to the joists, which significantly increases the risk of the floor bouncing.
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