Drywall – Why were the screws set in pairs in the drywall

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I'm currently removing a wall that separates my kitchen and living room. 1/2" drywall on 16" o.c. studs, typical. What I found to be strange was that the drywall was fastened with 2 drywall screws placed 2 inches apart, in pairs about every 18" up a stud, where a single screw would definitely suffice. May be I'm overthinking it, but is there any reason someone would use so many screws for a simple wall? House is a 1990 Bi-level, or raised ranch as I've seen them called. I just want to make sure that this isn't some specialized/important wall due to the odd overuse of screws.enter image description here

Best Answer

Like others have said in comments, drywall was commonly nailed in pairs to help prevent punch-through--hammers had a tendency to crush the drywall and weaken the hold of the nail. When screws were first adopted the practice was continued until it was known that precisely set flute-head screws hold better than nail heads, or until old-timers retired away.

Fun fact: Purpose-built drywall hammers had convex (mildly domed) head faces to help set nail heads below flush without tearing the drywall surface, so that tapers could cover them with compound.