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Unread 04-16-2020, 06:35 AM   #13
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Join Date: Jul 2005
Location: Fairfax, Va
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If you can find the screw heads there's a good chance you'll be able to force the driver bit through the mortar in the screw head and remove the screw. The use of an impact drill/driver might help. Removing them would be preferable to having the heads snap off - which drywall screws might do in this situation, leaving a bunch of drywall screw nubs that you'll have to deal with.

Yes, just set the blade depth to be the same as the subfloor thickness. Use a blade you don't care about.
If I recall correctly my memory is excellent, but my ability to access it is intermittent.
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