Countersinking screws and nails means to sink them equal to or below the surface of the material. This is a skill you must learn if you are trying to drywall a part of your home. The nails must be plastered over to hide them, and the more they stick out, the harder it is to plaster over them. On the other hand, countersinking too far can tear the dry wall.
Step 1 - Hang Drywall
Hang a piece of drywall so it covers one stud and half covers two studs.
Step 2 - Space Out
Use dry wall nails every seven inches along each stud. Be careful not to get too close to the edge of the dry wall because it will crumble apart.
Step 3 - Check Depth
Once you have finished putting up the dry wall you will need to double check that each screw is deep enough. Countersinking each nail makes sure that it will be easier to cover with plaster.
Step 4 - Plaster
Apply two coats of plaster over top of the nail heads and cracks.
Countersinking Nails and Screws
Sometimes countersinking is difficult in harder materials. Use a powerful drill or a nail gun to push nails and screws in as far as they can go.