Knightfly Instructions: Securing a 2nd layer of drywall!!!

To that end, gentlemen, is one of the reasons that I am glad that Rod had no problem with, and actually incorporated, using 3/4" wooden sheet goods (plywood, MDF or OSB) as the first layer in my studio design. It not only added structural rigidity and mass, it also allowed for the screw pattern to be equal for both layers of gypsum. This was something that I would have been insistent on if he hadn't already incorporated it. Just my paltry .02 Max

There is a huge difference in a wall falling down and a piece of sheet-goods becoming lose enough to fall down. Don't mix up the words.

I didn't mix up any words. You are the only one suggesting that "entire walls will fall down"! Nobody else mentioned that. Rod and dfeiszli were referring to the very real possibility that attempting to hold up a sheet of drywall with just six screws could result in "the whole thing falling down". Not the wall, just the drywall. They weren't even talking about the entire wall. They were only talking about the drywall falling down. It's pretty clear what they meant from reading the complete sequence of posts.

Flanking was never a question from what I was reading or even from where I am thinking.

I beg to differ! That's exactly what the entire original discussion was about! Flanking due to screwing through all layers of drywall into the studs. The argument that they are making in that original thread is very clear: Since it is dangerous to rely on only six screws to hold a sheet of drywall in place, the small amount of FLANKING (which you said they were not talking about, but actually they were) introduced by screwing though all the layers of drywall into the studs, is not something to be concerned about, provided that you are building a double-stud wall, since the wall is already decoupled, so the FLANKING caused by those screws is not a big issue. According to them, the risk of flaking from using more screws is outweighed by the risk of the drywall falling off if you don't. So who is confusing words here? :) To summarize: They were discussing the danger of drywall (not the entire wall) falling down if you try to hold it with only six screws, and weighing that against the issue of flanking caused by using more screws that go all the way through all the layers of drywall and into the studs. The conclusion reached was that: A) flanking from using more screws takes second place to safety, and its not a big issue with double studs anyway. 2) Six screws is not enough to hold drywall safely. 3) The recommendation is to screw all the way through for safety, regardless of the small loss in isolation due to flanking. - Stuart -

edit: I overstepped my boundaries with this last post. I will remove myself from the fray before that happens again. Please forgive my ignorance. Brien

I personally resent this continued interference.

YOU resent MY continued interference, Brien? That's rich, that is! :) :roll: You might want to take a look in a mirror one day...

I just did.