For 5/8 or drywall.
Drywall Screws, Nail...
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Yes ,just add the thickness of the foam board to the screw length. Too long of a screw makes it harder to bury the screw just slightly below the paper level for maximum holding power.
Last edited by k-2 on Sat. Feb. 11, 2023 9:37 pm, edited 1 time in total.
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Do you do the 2 screws close together thing?k-2 wrote: ↑Sat. Feb. 11, 2023 1:13 pmCourse. I generally use no longer than 1- 1/4 for half in drywall. Longer for 5/8 drywall. And dont drive too deep and break the paper especially on ceilings. Deep seated screws essentially hold nothing. Drywall may come loose from sinking the screw in too deep breaking the paper. NOT from the screw tearing out of the wood. No drywall hanger uses 3in screws or anything close to that.
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No ,but if i sink one in too far i have to put a second nearby for support. I Put 5 across on ceilings and 4 on walls.
I think the key to putting in drywall screws is to get them just deep enough that they miss the knife when applying mud.k-2 wrote: ↑Sat. Feb. 11, 2023 1:13 pmCourse. I generally use no longer than 1- 1/4 for half in drywall. Longer for 5/8 drywall. And dont drive too deep and break the paper especially on ceilings. Deep seated screws essentially hold nothing. Drywall may come loose from sinking the screw in too deep breaking the paper. NOT from the screw tearing out of the wood. No drywall hanger uses 3in screws or anything close to that.
I never use 3" drywall screws for drywall. I have used them to anchor a 2x4 to a wall that already has drywall over it. The point wasn't specifically about 3 inch drywall screws but rather that a 25 pound pail of small screws costs the same as a 25 pound pail of large screws. IMHO it costs manufacturer more to produce more screws than less screws.
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Ahhhh, so THAT was the point!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
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More common lengths are cheaper to make. Once the machine is set up to run, it costs more to stop and change it then it does to let the machine run no matter the size.
I would think a screw company might have machines set up that always run the same size. If they need to change a machine to run a different size I would think they would make ample inventory that would render the set up time minimal. I know nothing about making screws but would think the head is the intricate and common part that would remain constant and changing the length would probably be a pretty simple adjustment. For the complexity of a screw, I would have to think it is pretty automated.waytomany?s wrote: ↑Sun. Feb. 12, 2023 4:14 pmMore common lengths are cheaper to make. Once the machine is set up to run, it costs more to stop and change it then it does to let the machine run no matter the size.