the outdoor gypsum gets wet

[Nisse51]

have put exterior plaster on the back of the house, planning to leave it like that over the winter, will put wooden paneling in the summer. but it gets all wet when it gets cold.. is that normal??

thank you in advance..

 

[Johan Gunverth]

The outdoor plaster can withstand moisture for a while. However, I don't know how long. Parts of my outdoor plaster were exposed to driving rain for a year. According to the carpenter, there were no problems, and upon inspection afterwards, it turned out to be true. The plaster was completely unaffected.

 

[Milkshaken]

The outdoor gypsum can withstand a lot, the paper is impregnated, and then there is good air exchange between the gypsum and the panel... so there's no danger.. However, there is a significant difference in handling the gypsum when it is wet and cold, compared to when it is warm and dry... But that's another matter.

 

[ByggaNytt]

My exterior plaster has been up unprotected for 4 years and it still works as a shell protection BUT it will naturally be replaced when the last panel is installed this summer!

 

[Bob_the_builder]

The manufacturers guarantee, if I remember correctly, a durability of three months in an unprotected state. Reality, however, allows for SIGNIFICANTLY longer periods (see above...). The key is that the plaster is allowed to dry out occasionally. Wet outdoor plaster on a pallet would probably not be able to be used after 4 years...

 

[Stringfellow Hawke]

A year, says Gyproc themselves.

 

[Bob_the_builder]

A year, according to Gyproc themselves.

The official information from Gyproc (Gyproc Handbook) states three months, and it's hardly something they would deviate from in the event of a complaint. However, it's interesting to know if anyone has actually had issues with the gypsum because it has been up unprotected for too long.

Edit:
You are absolutely right about 12 months when it comes to the Glasroc variant! However, it is about three times more expensive!