A 4×8 sheet of a cement backing board covered with a mortar compound used to embed the covering of white quartz marble chips screwed into brick back sometime in 60s or 70s. One heavy dog. This 4×8 sheet was caulked to an adjoining piece of the same to cover the seam. Owner wants the brick exposed so take off the sheet. I finally remove the last screw and am expecting the sheet to drop the 2inches it is above the sidewalk. Nothing happens. Ah, a hidden screw. Where is it? I pry the side of the 4×8 to see where the connection is and the thing pulls from the brick. What? The rubber based caulk is still pliable and the whole 4×8 sheet swings open like a door on a hinge. I try to move it up and down. No movement. Open it all the way flush to the wall to try to crack the seam. Nothing. I get the ladder and with the sheet perpendicular to the wall I apply about half my weight to the top corner before she starts to give. Never seen such a thing. Sure wish I knew what caulk those guys used.
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