OF1010 rumor

[DeformedTree]

Sheet goods are in converted imperial measurements too here, that's why we have to calculate with dumb sizes like 2440 x 1220 mm.

Not everything. I can't think of what the 400x2000 gypsum boards are supposed to be in imperial?

We used to have 16" tall (400mm) drywall in the very early days of it, when it was a replacement for wooden lathe and then plastered over it. I don't think it was around very long  1940s-1950s.  Everything went to 4x8, 4x10, etc  blueboard and drywall.

One oddball we have is backerboard for tile, that is 3x5.  How they came to those dimensions I do not know.  A standard bathtub is 60" long and 32" wide.  So 4 sheets works well for prepping an alcove with just having to cut 2 sheets in half.  Not sure how close to 3x5 the stuff actually is.

 

[Cheese]

We used to have 16" tall (400mm) drywall in the very early days of it, when it was a replacement for wooden lathe and then plastered over it. I don't think it was around very long  1940s-1950s.

We have a ton of that stuff in our house that was built in 1952. Works great on vertical surfaces but on horizontal surfaces you sometimes see a plaster crack every 16” after 70 years of gravity and vibration doing her thing.

 

[AlexThePalex]

Sheet goods are in converted imperial measurements too here, that's why we have to calculate with dumb sizes like 2440 x 1220 mm.

Not everything. I can't think of what the 400x2000 gypsum boards are supposed to be in imperial?

Was talking about wood etc, all imported and regulated by the international market. Gypsum is produced locally in Europe.

 

[mino]

...
I have always wondered about the 5 x 5 sheets though? I just assumed that there was some reason, like maybe something as simple as the machines it is made on? or the application it was intended to be used for?

Thinking around, I now believe it would have to do with the wood type.
Birch is very twisty and in general is pretty small diameter. Making more than 5' size strips could have been too difficult and so eventually the size stuck as a standard. There was also no point "cutting to size" from such a small max size, so the symmetrical 5x5 was used with same length strips in both directions.

Never seen birch panels that would be have full-length birch strips longer than on the 1525 mm standard sheets.

Even the birch-laminated poplar core panels for veneering are in 1250 x 2500, but with the doubled birch layers always across, never length-wise.

 

[RobS888]

We used to have 16" tall (400mm) drywall in the very early days of it, when it was a replacement for wooden lathe and then plastered over it. I don't think it was around very long  1940s-1950s.

We have a ton of that stuff in our house that was built in 1952. Works great on vertical surfaces but on horizontal surfaces you sometimes see a plaster crack every 16” after 70 years of gravity and vibration doing her thing.

I live outside of Baltimore in a house built in 1942.  It has what is called wallboard, long narrow strips of drywall with 1/4 inch of browncoat (like stucco browncoat) covered with varying amounts of plaster to look flat. No cracks yet, but boy is it hard. I suspect the browncoat is fireproof. We have to use carbide tools. Just to cut 3 inch holes for pot lights I had to use a carbide hole cutter.

A normal ceiling hole cutter you can buy was ground down to a nub. 

 

[Packard]

I suspect the browncoat is fireproof

I suspect you should be wearing a mask and goggles when cutting this stuff.  Who knows what it is made of.

 

[Crazyraceguy]

Sheet goods are in converted imperial measurements too here, that's why we have to calculate with dumb sizes like 2440 x 1220 mm.

Not everything. I can't think of what the 400x2000 gypsum boards are supposed to be in imperial?

We used to have 16" tall (400mm) drywall in the very early days of it, when it was a replacement for wooden lathe and then plastered over it. I don't think it was around very long  1940s-1950s.  Everything went to 4x8, 4x10, etc  blueboard and drywall.

One oddball we have is backerboard for tile, that is 3x5.  How they came to those dimensions I do not know.  A standard bathtub is 60" long and 32" wide.  So 4 sheets works well for prepping an alcove with just having to cut 2 sheets in half.  Not sure how close to 3x5 the stuff actually is.

My house was built in 1929 and it used to have that, until a I did a major remodel in 2006. It was printed in the back with a logo that called it "Rock Lath". It is still there in the bedrooms upstairs, because nothing really changed in them. So many other walls were changed or moved that it was just easier to strip it all out , rather than try to patch back into it. Mine was hung with a gap between the strips to act as a key, like the wood lath does in a purely plaster wall.