Drywall Screws

• Coarse threaded drywall screws have wider and fewer threads, whereas fine threaded drywall screws have tighter threads.
• Coarse threaded screws are designed for screwing into wood while fine threaded screws are suitable for screwing into metal.

• Bugle head screws are ideal for drywall. They are countersunk & sit flush with plasterboards to provide an appealing finish.
• Wafer head screws are used for constructing ceiling frames or metal wall systems and are not used for securing plasterboards.

Collated screws are held together with a plastic strip designed to fit perfectly into an auto-feed screwdriver, while uncollated screws are comparatively loose and can be used without an auto-feed screwdriver.

• These screws pop out of drywall either because they were driven too deep or the studs have contracted / expanded.
• To prevent this, avoid installing screws too deep. The screw head should be fully exposed outside the surface paper covering drywall panels.
• Using a dehumidifier also prevents popping out of screws as it controls the amount of moisture in the air. By setting the dehumidifier at 40% to 50% relative humidity, the air won't be too dry or too humid, and thus, the studs will be less likely to contract and expand.

• Use a dedicated drywall screw gun with a drywall bit.
• Select the drywall screw of appropriate size and ensure that the screw length is nearly 10 mm more than the drywall thickness.
• Mark the stud locations.
• The screws should be approximately 6.5 mm from the wall edge.
• Use the sharp point of the screw for piercing the surface.
• Place the drill-driver bit over the screw, turn On the drill and let the screw drive itself into the stud & drywall.
• To prevent the screw from slipping, apply more force when it is inserted up to three-quarters.
• Stop when the surface and screw head touch each other.