Outdoor plasterboard

[spocks_beard]

My partner's brother has extended his house and the builders have set up exterior gypsum as protection until next year when the paneling will be installed.

 

[General_Failure]

I am currently building a garage and I don't think I will be able to put up the panel until after the winter. That is why I have put up exterior drywall and I think/hope it will be enough. If you want to be sure not to get any moisture on the inside, you should probably supplement with a tarp or something similar because the exterior drywall is not water-repellent (moisture goes through the board).

 

[General_Failure]

If it is not water-repellent, what is the difference from regular plaster?

I think it mostly doesn't break as easily when it gets wet.

There are probably different variants of exterior plaster with varying degrees of water-repellency. The ones I bought at ByggMax don't seem to be particularly repellent.

 

[sville]

I can report that NCC has completely removed outdoor gypsum from their constructions as mold spores develop after 2-3 weeks in its paper. Personally, I never use outdoor gypsum.

 

[Fasting65]

There is an outdoor plasterboard with improved protection. By coincidence, all three manufacturers are publishing it as news simultaneously....

Danogips:
http://www.danogips.se/Produktk/pro...27b62119b645cd61c1256fb20048f5a0?OpenDocument

Norgips:
http://www.norgips.no/se/X9/page1.html

Gyproc:
http://www.gyproc.se/gyproc/content...4A54FC1256FEF00267D08?OpenDocument&m=mdmd

 

[Fasting65]

Can inform you that NCC has completely removed outdoor gypsum from their constructions as mold fungi develop after 2-3 weeks in the paper on it. Personally, I never install outdoor gypsum.

And what do they use instead?

 

[MathiasS]

I can inform that NCC has completely removed outdoor gypsum from their constructions as mold fungi form after 2-3 weeks in the paper on it. I never use outdoor gypsum myself.

It's probably about how you handle the boards.....

Low houses are being built nearby, where gypsum is used but they are quite careful to cover with plastic to avoid exposure from rain.

 

[Pake]

An acquaintance had asfaboard without paneling an entire winter without problems...

 

[MathiasS]

So exterior drywall is not a good idea as a surface layer until next spring?
Can you use masonite instead?

I wouldn't hesitate to have exterior drywall over the winter. If it's an exposed location, I would put plastic over it as protection.

 

[phulden]

... because the outdoor gypsum is not water-repellent (moisture passes through the board).

Yes, the gypsum is water-repellent but not diffusion-tight. That's exactly how it should be. Otherwise, you would have material trapped between two diffusion-tight layers (gypsum and internal diffusion barrier), and that ends with mold...

 

[General_Failure]

Yes, the gypsum is water-repellent but not diffusion-tight. That's exactly how it should be. Otherwise, you would have material trapped between two diffusion-tight layers (gypsum and internal vapor barrier) and it would end with mold...

My boards (manufacturer Lafarge) clearly let through water in liquid form. If it rains on one side of the board, the other side also becomes visibly damp.

 

[phulden]

Seems to be very different experiences of this then.

 

[Bob_the_builder]

My outdoor plaster (also Lafarge, but purchased elsewhere than Byggmax) managed to withstand the forces of weather for nearly half a year. There were no problems, it turned out. I believe the key to success is allowing the plaster to dry thoroughly between rain showers. It probably wouldn't be a good idea to leave an insulated house without a facade, as the plaster could then only dry outward.

 

[MathiasS]

My experience is that Buildmax outdoor gypsum (Lafarge) loses color and looks a bit corroded after a few months outside. However, Danogips boards look the same after significantly longer exposure outdoors.

Regarding resistance to driving rain, I don't have an opinion - I would probably be quite careful to cover the gypsum if there was a risk of the board getting thoroughly wet...

 

[DanielByggare]

If the disk is used properly for what it is intended for, it works perfectly...