Hello everyone,
We still need to make a decision about our interior walls at some point.
Our builder explained the (Q-)options for selecting the interior walls as follows:
• 12.5 mm gypsum fiberboard + 12.5 mm gypsum plasterboard
or
• 13.0 mm wood-based panel (e.g., OSB) + 12.5 mm gypsum plasterboard
Both options should be similar in load-bearing capacity, do you think so? I have a gut feeling that the option with the OSB panel might be somewhat stronger. On the other hand, I’m not really sure what additional load capacity we would need. I think a hanging kitchen cabinet sets the benchmark here, and both options should easily support that (even the new desired TV weighs only 35 kg).
Since we are planning a mechanical ventilation system with heat recovery, and it’s sometimes said that the air can be a bit drier with this system, one might argue that the double gypsum boarding could store and release twice as much moisture. But that is just a speculative theory of mine...
What would you do?
I appreciate your opinions because we will have to decide eventually 🙂.
We still need to make a decision about our interior walls at some point.
Our builder explained the (Q-)options for selecting the interior walls as follows:
• 12.5 mm gypsum fiberboard + 12.5 mm gypsum plasterboard
or
• 13.0 mm wood-based panel (e.g., OSB) + 12.5 mm gypsum plasterboard
Both options should be similar in load-bearing capacity, do you think so? I have a gut feeling that the option with the OSB panel might be somewhat stronger. On the other hand, I’m not really sure what additional load capacity we would need. I think a hanging kitchen cabinet sets the benchmark here, and both options should easily support that (even the new desired TV weighs only 35 kg).
Since we are planning a mechanical ventilation system with heat recovery, and it’s sometimes said that the air can be a bit drier with this system, one might argue that the double gypsum boarding could store and release twice as much moisture. But that is just a speculative theory of mine...
What would you do?
I appreciate your opinions because we will have to decide eventually 🙂.
Oh man, somehow I completely forgot about my own thread here and totally missed your reply! Sorry and thanks for pointing it out!
I just read through the other thread... There are really some useful contributions, although there seems to be some disagreement specifically about the load capacity. So I didn’t fully understand it...
First this:
Then this:
And finally again this:
It kind of sounds healthier (although I still don’t fully understand the vapor-permeable part — in any case, we don’t have any foil in our wall build-up), but do you really have to worry about load capacity when installing wall cabinets? We are planning to hang some already (not only in the kitchen). I had used the expansion anchors described by hampshire once in an old apartment, which had double-layer drywall. Sure, the anchors are more expensive and a bit trickier to use, but you usually don’t do this every day, so from that perspective it’s manageable.
Back then, I always felt a bit uneasy about that cabinet and hoped it wouldn’t fall down. When I moved out, I removed those anchors and was impressed by how well they held! Of course, I’m not He-Man who can simulate the moment of the cabinet with an extra lever, but it definitely wasn’t easy to pull out the anchor, which had much less expansion...
Still, I’m wondering here how much less force gypsum fiberboard can handle compared to OSB...
I just read through the other thread... There are really some useful contributions, although there seems to be some disagreement specifically about the load capacity. So I didn’t fully understand it...
First this:
FoxMulder24 schrieb:
As far as I know, gypsum fiberboards are not as load-bearing as OSB boards. That means you have to keep this in mind or are limited when mounting tall cabinets and kitchens.
Then this:
Reltaw2021 schrieb:
By now, I actually see the advantages of the alternative and feel much more relaxed: vapor-permeable, equally load-bearing for hangings, non-combustible, no emissions, vertically load-bearing, so also structurally and statically stable, better sound insulation compared to OSB, more resistant to summer heat, possible to avoid using vapor barrier foil.
And finally again this:
Grundaus schrieb:
In addition, OSB is much easier when mounting shelves, pictures, or other items.
It kind of sounds healthier (although I still don’t fully understand the vapor-permeable part — in any case, we don’t have any foil in our wall build-up), but do you really have to worry about load capacity when installing wall cabinets? We are planning to hang some already (not only in the kitchen). I had used the expansion anchors described by hampshire once in an old apartment, which had double-layer drywall. Sure, the anchors are more expensive and a bit trickier to use, but you usually don’t do this every day, so from that perspective it’s manageable.
Back then, I always felt a bit uneasy about that cabinet and hoped it wouldn’t fall down. When I moved out, I removed those anchors and was impressed by how well they held! Of course, I’m not He-Man who can simulate the moment of the cabinet with an extra lever, but it definitely wasn’t easy to pull out the anchor, which had much less expansion...
Still, I’m wondering here how much less force gypsum fiberboard can handle compared to OSB...
Originally, I would have suggested using the option with a single layer of OSB. By now, I would prefer to use two layers of gypsum board instead, for consistency in materials. Different materials tend to expand differently, which can lead to cracking and possibly creaking...
But our interior walls are also insulated with 40mm (1.6 inches) insulation. However, my question still referred to the exterior wall (which would be lined on the inside with the same type of paneling; here, the exterior insulation is actually applied right after the two gypsum boards, which is why I asked…
Tolentino schrieb:Interesting point. Whether this really has any significant effect on the room-facing side of the walls, I cannot judge…
Originally, I would have recommended the option with one layer of OSB. By now, I would prefer two layers of gypsum board for material consistency. Different materials tend to expand differently, which can lead to cracks and possibly creaking...
Nixwill schrieb:
However, our interior walls will also be insulated with 40mm (1.6 inches) insulation. My question was still about the exterior wall (which is lined on the inside with the same type of board; here, after the two gypsum boards, the exterior insulation is actually applied, which is why I asked…)
An interesting point—whether this really has significant effects on the room side of the walls, I cannot assess… You can use ESB instead of OSB. It provides a certain level of vapor permeability.
I am not a fan of gypsum board lining for timber framing.
That’s just my personal opinion.
An 18mm (0.7 inches) wood panel can really withstand a lot!
TmMike_2 schrieb:
You can use ESB instead of OSB. It provides a certain level of vapor permeability.
I'm not a fan of drywall sheathing for stud frames.
That's just my personal opinion.
An 18mm (0.7 inch) wooden board is very durable! I just looked into it again. I found little information on vapor resistance.
ESB is supposed to handle moisture better, for sure.
For some reason, my energy consultant recommended it last year during the house construction.
I didn’t question it further. I ordered and installed the material. The cost was about the same, so it didn’t matter to me.
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