- 1). Insert wood shims if any studs aren't flush. This will ensure that the greenrock is perfectly flat when you install it.
- 2). Affix the shower stall to the studs by screwing drywall screws through the flange.
- 3). Measure the wall space around the shower stall and cut greenrock to fit, being sure to cut enough to cover the flanges. The easiest way to cut greenrock is to score the paper on the exterior side with a utility knife, break it along the score and then cut the paper on the back.
- 4). Spread plaster along the edge of the flange and lay fiberglass drywall tape over the it. Before the plaster has set, install the greenrock over the flange and screw it to the studs. This will create a watertight barrier around the edges of the greenrock where it meets the shower stall.
- 5). Finish the seams of the greenrock by spreading joint compound (mud) on them, laying fiberglass tape on top, and scraping away extra mud with a drywall blade. Let the mud dry, then spread two or more coats to flatten the wall and blend the seams.
- 6). Cover the heads of all screws with at least two coats of mud.
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