Drywall Screws What Are They?
Drywall or plasterboard is generally made up of a paper liner wrapped around a gypsum plaster inner core and is fixed to wall frameworks using nails, adhesives and of course screws.
Drywall screws are specifically designed for this application and have the following features :
Bugle head countersink which designed to hold the board tight without breaking through the paper liner which is what happens when a standard wood type screw with an angular countersink does.
The pitch of the screw can be classified as either coarse or fine. The more coarsely threaded the screw, the tighter it holds. Plus, since it contains fewer threads, it screws into place faster. On the other hand, although finely threaded screws take longer to insert, they have sharper points, making it easier to insert the screw in the first place. You’re meant to use coarsely threaded drywall screws when you’re attaching the drywall to softwood studs, while finely threaded drywall screws are meant to be used when you’re attaching the drywall to light metal studs.
They are always plated in either a black oxide finish or a zinc plate for corrosion protection as it’s likely they will be covered over with a wet skim of plaster to finish off the joints, driver types are mostly Phillips No2. They are also available in a self drilling form for fixing to heavier steel sections and in collated ribbons for use with auto feed systems.