Attic conversion - use OSB / Rigips?

2023-02-03 17:23:59

Since we are already on the topic, fittingly related to the other topic

We are still undecided whether to use OSB boards for the expansion or to use drywall directly. Unfortunately, even after talks with various friends and acquaintances, we are still not much wiser :(

Can anyone say something about the advantages or disadvantages.....?

Thanks a thousand in advance :)

2023-02-03 19:57:11

For the attic conversion (walls, ceilings), Fermacell boards are used less often than OSB as an alternative to drywall panels.

Fermacell boards are not quite as smooth on the surface as drywall panels and usually have to be fully filled. With drywall, only the joints and screw holes need to be filled. Drywall panels are less dimensionally and surface stable than Fermacell or OSB. Drywall swells irreversibly under strong moisture exposure (unless the green boards are used). Drywall and Fermacell boards can be scored and bent during cutting. OSB boards have to be sawed. In terms of fire protection, drywall and Fermacell are about the same or there are special fire protection boards; OSB is less suitable for fire protection. Special anchors can only be partially secured in drywall and larger loads can only be attached to the stud framework. OSB is best suited for this.

That was what came to mind quickly.

2023-02-03 22:32:09

Rigips because I believe it is more vapor-permeable.

2023-02-03 23:06:00

Sorry I meant rough-sawn wood not drywall. Rough-sawn wood is optimal.

2023-02-04 17:42:10

For the attic conversion (walls, ceilings), Fermacell boards are used less often than OSB but as an alternative to plasterboard.

Fermacell is not quite as smooth on the surface as plasterboard and usually needs to be fully skimmed. With plasterboard, only the joints and screw holes are skimmed. Plasterboard is less dimensionally and surface stable than Fermacell or OSB. Plasterboard swells irreversibly when exposed to too much moisture (unless the green boards are used). Plasterboard and Fermacell boards can be scored and bent when cutting. OSB boards must be sawed. In terms of fire protection, plasterboard and Fermacell are roughly the same or there are special fire protection boards; OSB is less suitable for fire protection. Anchors (special ones) can only be partially secured in plasterboard and heavier loads can only be attached to the framework. OSB is best suited for this.

This is what came to mind quickly.

All right. Thanks for the great help & explanation

2023-02-04 17:47:57

oh yes one more thing I would consider: older pressboard is criticized today for its formaldehyde emissions. Unfortunately, I do not know if this is still the case today. I am sure something has been done about it, but the question is "what exactly". New types of drywall "ActiveAir" are said to even absorb formaldehyde from the room air and neutralize it. But even here one should skeptically question how that works / is supposed to work.

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Attic conversion - use OSB / Rigips?

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