How to get boards straight on a wavy wall?

[seniorkonsult]

#30; I wrote in zone 1 and that I would never use plaster in wet areas at all. I know it is stated in the table that plaster is allowed under certain conditions, but the fact remains regarding vapor transport through the waterproofing layer. Only the new membranes meet the requirements. As for Boverket, they refer to the manufacturer's instructions, and thus it's usually type-approved products that are used if the control plan is to be fulfilled with associated documents. But why take a chance and use plaster even if the waterproofing cladding is okay, the mixer can come loose, children step on the water pipes to reach the shampoo bottle, etc.

 

[seniorkonsult]

#26 vctrex; It's frightening how much misinformation people spew left and right, it's no surprise that people are afraid to do their own wet rooms. In my opinion, it’s not more difficult than choosing BKR or GVK and then following their instructions to the letter.

Furthermore, I am 100% convinced that a liquid-based waterproofing system applied in the correct amount does not allow moisture in vapor form to penetrate to the extent that mold would start growing on gypsum board. There’s no chance. This would have to be in an extreme case where the gypsum is trapped in a poorly insulated exterior wall between a vapor barrier and a liquid-based waterproof membrane.

Lucky that there are experts who can completely dismiss experts and tests by just having an opinion and ignoring the conducted measurements and reports. Which liquid-based waterproofing systems have you tested? One should also consider that in the past, people showered (bathed) 2-3 times a week, and today it's not uncommon for someone to shower 2 hours a day in a shower room.

 

[injonil]

senior consultant, so it wasn't you who wrote this:

Stop!
No gypsum in wet rooms, i.e., regular gypsum. Additionally, do not screw gypsum so that the screw goes through the paper. The board will then be loose because it is the cardboard that holds the board. Mentioning this about gypsum because gypsum was mentioned above.
Read more in the attached link:
[link]

and this:

stoif: Of course, there are still those who use shrinking, loosening plastic mats as a waterproof layer in the shower today, and if you do that, you should probably glue the details that are to be mounted on the wall. GVK is constantly changing its regulations. A few years ago, it was completely banned by the National Board of Housing, Building and Planning to use cardboard-based gypsum in wet rooms.
I have seen numerous wet rooms with mold-infested gypsum, especially at fastenings.

 

[seniorkonsult]

Well, excuse me, sometimes things go too fast. However, it remains that there are a lot of requirements with the waterproofing. Clarifying here and in #32.

View attachment GVKs.pdf

 

[injonil]

It is not a clarification, it is completely different information that directly contradicts what you wrote earlier.

 

[Enk Projektet]

I think the original poster knows how the wall will become straight now.......

 

[Gabbe1]

I believe TS knows how to make the wall straight now.......

 

[kacke_]

Did the wall become straight? How did you do it?

 

[ronolo]

There are no shortcuts to the perfect sound. Just shim or regl. If the centimeters are important, then shimming is the only option. Straightening old walls is a pain.

 

[seniorkonsult]

The wall is probably straight now, but I return with a fool's persistence about drywall in wet rooms. It might be interesting for others. Read BBV; I am still talking about ceramic cladding.
http://www.bkr.se/fileArchive/branschregler/Branschregler_web_2010.pdf

5.7.1 Walls
Boards that are to be the base for ceramic waterproofing constructions on walls should be manufacturer-recommended and suitable as a base for waterproofing and tiling.
Boards in wet zone 1 should maintain stability after moisture exposure without losing their technical properties and be resistant to microbial growth.
Gypsum boards with a paper lining should not be used in wet zone 1 as a base for waterproofing and tiling or as a backing board.
Wood-based boards should not be used as a base for waterproofing and tiling.
Board walls should meet the tolerance requirements according to table 43.B/HSD-1 AMA Hus.

5.7 Board Constructions
Boards/board constructions in wet rooms should, according to the manufacturer, be documented as suitable/intended as a base for ceramic waterproofing systems in wet areas and be installed according to the board manufacturer's instructions.
Gypsum boards with a paper lining should not be used in wet zone 1 as a base for waterproofing or as a backing board. Applies to both floors and walls.

Mold Growth
The paper layer on gypsum boards is susceptible to the growth of toxic so-called paper mold (Stachybotrys chartarum) which can develop behind waterproofing. When intervening (renovating/ dismantling) wet room walls with paper-lined gypsum boards, protective equipment is required; protective clothing and particle filter 3. Normally, however, the mold poses no risk to residents as long as it is behind tiles and waterproofing.
Even very small amounts of moisture, such as leakage from faulty fittings and the like, can start the growth. Applies regardless of the type of waterproofing.
The industry guidelines' recommendation that paper-lined gypsum boards should not be used in the most exposed area of the wet room, wet zone 1, aims to contribute to healthier construction by following the precautionary principle according to the Environmental Code, Chapter 2, Section 3. It states the obligation to observe limitations and precautions so that measures do not harm health or the environment.
BBR 6:51:
"Buildings should be designed so that moisture does not cause damage, foul odors, or hygienic issues and microbial growth that can affect human health."
* All standards and norms referred to in the Building Ceramics Council's Industry Rules for Wet Rooms

 

[injonil]

What is it you want to say?

 

[seniorkonsult]

Well, read up. It's about paper-faced gypsum in wet rooms that many say is approved.

 

[Lolle]

Well, read up. It's about paper-covered gypsum in wet rooms that many say is approved.

Yes, but we were still talking about GVK and I have mentioned in many threads that cardboard gypsum is not allowed according to BKR.

The truth is that attempts have been made to reintroduce it since the damage statistics do not show any additional costs or problems as the remediation after water damage involves replacing the boards anyway. But the proposal is extremely opposed, which is not surprising when the board suppliers, who are a major source of income for BKR, profit greatly from wet room boards...

 

[seniorkonsult]

BBM is well bKR and references to industry regulations apply as I understand it. Now, I have not read up on GVK at the moment, but it is about wet room control and the requirements should be equivalent, right?

 

[injonil]

You referred to GVK's regulations in your first post where you claimed that plasterboard was prohibited in wet rooms. Read yourself in the link you refer to; plasterboard is allowed outside zone 1 under certain conditions (which are usually met).