How to Fix Drywall Wall Sheets After House Floods and caused damaged to the drywall and timber baseboards. How to Fix it? First you need to remove the old damaged sheets but cutting neatly at the joint line, which in our area is approximately 1200mm up the wall is where the top and bottom drywall sheets meet. We replaced the lower sheet on the walls and replaced the baseboards and architraves around the doors and windows. We also had to cut the metal external angles slightly above this joint and cut and install the angle to match seamlessly to the upper area of the existing angle. This part is important if you want a flawless finish when joining new to old drywall. A good undercoat over the and past the new drywall finish is also important to stop flashing and having any areas that stand out after painting top coats are applied. Its important to note that when applying compounds over drywall that has been previously painted, especially with a paint that has a sheen level, some “pin-holes” do occur. These pinholes will need to be further given a light skim and is very common.

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