Procedures to Repair Drywall
When there are several repairs to do with a drywall in more than one room, just be aware that a sheet of regular drywall weighs about 1.7 pounds per square foot, which is about 54 pounds; therefore, you will be dealing with heavy weight drywall materials during the repair period.
In repairing drywall, there are two kinds of pre-mixed joint compounds that will be needed to coat cracks, holes, etc. on a drywall and they are the all-purpose joint compound and the lightweight joint compound. The all-purpose joint compound is applied as a first coating over paper tape on seams on a damaged drywall because it contains more glue agents than the lightweight compound. Containing less glue agents, the lightweight joint compound is mainly used as a second coating, but more as a finish coating over seams and corner bead of drywall areas.
Use a peel-and-stick patch which is an aluminium screen covered by a fiberglass mesh, in repairing a doorknob hole of a drywall, and press the patch over the doorknob hole using a 4 inch or 6 inch drywall knife to apply all-purpose joint compound over the mesh and make about three coatings of the compound over the mesh.
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Here are recommended steps in repairing battered corners of a drywall: first, cut away the metal corner bead with a hacksaw; second, use a nail bar to remove the damaged section of the corner bead; third, hold the new corner bead in place by marking its length; fourth, cut a new section of the corner bead to length and nail it and sand the surface of the bead if it is glossy; fifth, coat the bead with several coatings of lightweight joint compound using an 8 inch drywall knife.
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For creeping cracks on drywall that are often detected below a window or above a door, use an abrasive-coated foam block, like a sanding sponge, to smooth the cracks, followed by applying a thin coat of all-purpose joint compound to the smoothed, cracked areas, then sand the coated cracks again and apply a second coat of the all-purpose compound and finish the areas with a spray elastic crack coating.
To restore back popped nails and screws, which can happen when there is lumber shrinkage, apply these steps: twist a utility knife into the wall to carve away the joint compound that is embedding the popped nail or screw; tighten the screw or tap in the nail; use a small drywall knife to apply three coatings of lightweight joint compound over the screw or nail head.
The following steps are suggested to repair soggy, drywall ceilings: use a hand sander and coarse sanding mesh to remove out texture and smooth out the damaged ceiling area; if water is the cause of the drywall ceiling to sag, re-attach the ceiling along the seam, nailing the drywall to the joist; apply a coat of stain-sealing, shellac-based primer over the damaged ceiling; use a roller to apply a mixture of drywall compound with water over the ceiling; after the drywall compound has dried up, add texture back to the ceiling using a short-handled stomping brush.