In the old days the edges of the unfinished drywall curved gently inwards. When plastering, you had to build up the indented area. But the drywall I got from Rona (think Home Depot with a Quebec accent) has a sharply recessed edge, forming a shallow flat-bottomed valley for the tape. Does this type of drywall require a different technique?
Anyway, I did the old, slightly angled buildup of compound in three widening layers, and now I have a slight, gradual bulge between the panels, about 14 inches across. I can't see it, but I can feel it when I pass my hand across the joint. Is there supposed to be a very slight bulge? How slight, and over what width (say, 1/16 inch over 14 inches?)
Or for this kind of drywall, should I sand back to the valley? I believe this would leave a narrow vertical band of plaster, flush to the drywall surface, but I don't know that for sure.
-- "For it is only of the new one grows tired. Of the old one never tires." -- Kierkegaard, _Repetition_
James Owens, Ottawa, Canada