Why does everyone use OSB behind drywall?

[Tomture61]

That's how they've been building since they started with plastic in the 60s-70s. As long as the screw stays in place, it's completely sealed. Removing the screw does nothing since the 4 square millimeter hole has no impact at all unless, for some strange reason, you have very high overpressure in the house.

I don't have FTX in the house, I have a FLVP. That means I can't balance the degree of underpressure in the house. When the house was new, you had to push hard on the front door to open it. Over time, the electrical installation and sealing strips for windows/doors have aged.

My stick-built garage is much better constructed than my residential house. Installation layer for electricity, OSB + drywall, roof decking, better insulation/construction in the corners of the exterior walls.

 

[useless]

I don't have FTX in the house, I have a FLVP. That is, I cannot balance the degree of negative pressure in the house.
When the house was new, you had to push hard on the front door to open it.
Over time, the electrical installation and sealing strips for windows/doors have aged.

In other words, it's completely risk-free to put some screws in the wall.

 

[Tomture61]

In other words, completely risk-free to drive some screws into the wall.

A guess, perhaps.

 

[droopy]

A standard interior door doesn't stop any smoke, anyone who thinks so simply doesn't know anything about construction or fires.

Took a look at the door to the kitchen.. it has A30 on it (should withstand fire for 30 minutes.)
Also have a fire damper in the kitchen fan that closes at 85-90 degrees with a fusible link.
I believe most interior doors can handle A15 and many A30. For A60, it requires some sturdier equipment..