As a sibling thread to "Tools that should never have been made," I'm starting this one.
First up is:
All windproof fabrics in water resistance class W2, W3, or worse.
Pure junk that should never have been invented. Their only function is to protect against wind, but they don't protect against moisture particularly well and are often not as vapor-permeable as the higher water resistance class W1 (paradoxically enough).
Useless for protecting construction during building time, as the frame gets wet underneath if it rains on the fabric, leading to black mold. Equally useless to have behind an air gap where insulation ends up behind, which might be the most common placement of it. Precisely because condensation water, after a short time, goes through the fabric, right into the frame and insulation.
Another placement could be behind, for example, west coast panels or similar facade panels, which means it is protected from rain directly on the fabric, so it possibly works for that.
The only advantage is that it's cheaper than fabrics in class W1. I believe it should never have been made since it doesn't protect against moisture as it should, and is less vapor-permeable.
First up is:
All windproof fabrics in water resistance class W2, W3, or worse.
Pure junk that should never have been invented. Their only function is to protect against wind, but they don't protect against moisture particularly well and are often not as vapor-permeable as the higher water resistance class W1 (paradoxically enough).
Useless for protecting construction during building time, as the frame gets wet underneath if it rains on the fabric, leading to black mold. Equally useless to have behind an air gap where insulation ends up behind, which might be the most common placement of it. Precisely because condensation water, after a short time, goes through the fabric, right into the frame and insulation.
Another placement could be behind, for example, west coast panels or similar facade panels, which means it is protected from rain directly on the fabric, so it possibly works for that.
The only advantage is that it's cheaper than fabrics in class W1. I believe it should never have been made since it doesn't protect against moisture as it should, and is less vapor-permeable.
I also want to mention another material, which is one of the most common building materials today.
It is a good material from several viewpoints, such as being smooth and good for wallpapering, easy to work with, and also from a fire safety standpoint. I am of course writing about drywall panels, not hard to guess, right?
But using it in unreinforced form, as a standalone wall panel without wood behind it, is utterly worthless if you intend to attach things to it. Once you've made a hole, it just gets bigger and bigger. You can't secure a nail that holds. The material is terrible in terms of fastening (i.e., fastening in the material to attach things to it). Screwing regular screws is just a no-go either.
To attach things, you need special tools, which cause more damage to the wall than "necessary" (though it becomes necessary because gypsum is - gypsum).
From that point of view, the material should never have been invented/manufactured.
I felt I wanted to include this material, despite having several positive aspects, precisely because gypsum has nonetheless caused many, many headaches for a lot of people over the years. People have been angry and cursed... etc. ...so gypsum still deserves to be listed here, with the reservation that it is actually a very good material if you supplement it with wooden boards behind. Then they work perfectly!
It is a good material from several viewpoints, such as being smooth and good for wallpapering, easy to work with, and also from a fire safety standpoint. I am of course writing about drywall panels, not hard to guess, right?
But using it in unreinforced form, as a standalone wall panel without wood behind it, is utterly worthless if you intend to attach things to it. Once you've made a hole, it just gets bigger and bigger. You can't secure a nail that holds. The material is terrible in terms of fastening (i.e., fastening in the material to attach things to it). Screwing regular screws is just a no-go either.
To attach things, you need special tools, which cause more damage to the wall than "necessary" (though it becomes necessary because gypsum is - gypsum).
From that point of view, the material should never have been invented/manufactured.
I felt I wanted to include this material, despite having several positive aspects, precisely because gypsum has nonetheless caused many, many headaches for a lot of people over the years. People have been angry and cursed... etc. ...so gypsum still deserves to be listed here, with the reservation that it is actually a very good material if you supplement it with wooden boards behind. Then they work perfectly!
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· Västerbottens län
· 18 048 posts
Chipboard and MDF in our wet rooms, kitchens, and bathrooms.
Protte
Protte
On top of that, when it has been used in pitched roofs, I have seen where the roof battens have been completely black with black mold, with several centimeters of space between the roof battens and the insulation foam that has sunk down. I suspect that this insulation somehow trapped moisture under the roof battens, hence the black mold. Although it could certainly have been due to other factors as well. But it was bad in any case!H heimlaga said:
YAL was even worse than YAM.
Stylish modern interior doors with paper filling that barely soundproof and just slam shut and cause trouble with the slightest draft. Ugh!
Plastic paint for facade painting - in all colors 
The problem is not the drywall but stingy contractors.Martin_B said:
Stickan
I have to defend YAM actually. It is preferably used when you are going to lay a surface felt on topmattiasp said:
But as an underlay for roof tiles and the like, I agree with you
Partially agree with you about drywall.
In my condo, there’s only single drywall on the non-load-bearing walls and 150mm really hard concrete on the load-bearing ones.
I’ve had to buy a number of molly plugs to hang all the pictures, coat rack, shelves, mirrors, etc.
At my dad's place, there's OSB behind the drywall, and there you can hang a 65” TV with 4 screws right into the OSB.
Then I hate concrete because I have to drag up the hammer drill from the basement, and it makes a mess with dust and everything. Ugh.
When we buy/build a house, it should be wood with at least OSB behind the drywall.
In my condo, there’s only single drywall on the non-load-bearing walls and 150mm really hard concrete on the load-bearing ones.
I’ve had to buy a number of molly plugs to hang all the pictures, coat rack, shelves, mirrors, etc.
At my dad's place, there's OSB behind the drywall, and there you can hang a 65” TV with 4 screws right into the OSB.
Then I hate concrete because I have to drag up the hammer drill from the basement, and it makes a mess with dust and everything. Ugh.
When we buy/build a house, it should be wood with at least OSB behind the drywall.
Eternit boards for houses and eternit in all forms as building material.
PCB in joints that now must be remediated.
Blåbetong.
Toxic leveling compound from the 80s.
PCB in joints that now must be remediated.
Blåbetong.
Toxic leveling compound from the 80s.
Do you mean there is any advantage to YAM over YAP? I got the impression that YAM is used by less scrupulous "craftsmen" to deceive ignorant clients.F frollic123 said:I probably need to defend YAM actually. It is advantageously used when laying a cap sheet on
I just went to Icopal.se and read up. You are absolutely right. YAM should be allowed. "Craftsmen" who trick clients into using YAM as an underlay for clay tiles should not be allowed.