I just started a 1/2 bath semi-renovation upgrade, and after removing the vanity and bowl to install a nice pedestal sink my wife and I really like, I noticed that I am unable to anchor the sink as the manufacturer recommends (2X6 between the wall studs) due to the fact that the contractor installed the drain line running vertically in the same wall space, and I can’t install the horizontal 2by. Also, one of the holes in the sink for the anchor studs will hit dead center on the existing vertical drain pvc pipe. Also, the existing waste line is 2″ low tee’d off the vertical drain line. I’m in a pickle and wonder if there are suitable methods to anchor the sink. The pedestal bears most the weight of the sink and I know the anchor is there too keep the sink from pulling away from the wall if someone leans on the front edge of the sink. Any suggestions?
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If the vent/drain line is in the way and the drain arm is 2" too low, there is no quick fix. Get a plumber to rework the lines to the correct positions.
I have done this when opening up the wall for blocking was not allowed. Set up the sink and outline what of the wall it'll cover. Note the mounting hole locations. If you have one framing member behind there, cut out the sheetrock that'll be covered and replace with 1/2" ply (if 1/2" sheetrock). Fasten the crap out of that ply and use it to mount to. Hilti makes a removable 1/4 x 20 toggler that is a toggle bolt that you slide mount in a hole, it won't fall down the wall. You then take a 1/4 x 20 mach. screw (included) and mount the sink. You need enough room behind the sheetrock to flip the wings. There's another anchor that's used to mount grab bars w/o blocking that someone here might mention. best of luck.
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Remodeling Contractor just outside the Glass City.
http://www.quittintime.com/
Did you ever try to rip out a lav that was silicon sealed in place? Its tough stuff. Make sure the wall board has been primed first and dry then put a bead around the entire contact area. I fit a 6" length of 3/8 clear hose to the caulk tip so a can form a continuous bead on the underside. Also consider using hard chromed brass supplies and waste since the will help the unit stay tight.