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How to Install Backer Board around a Tub
How to Create a Smooth Transition from the
Backer board to a Tub
By: Mark J. Donovan
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When installing backer board around a
tub, the best solution is to use furring strips attached to the wall studs.
Attach the furring strips perpendicular to the wall studs at a height where the
underside of the tub flange area rests on the top of the furring strips and the
bottom of the tub rests on the floor. Make sure to secure the furring strips to
the wall studs with either 2 inch screws or 8d penny framing nails.
Next apply an adhesive to the top edges of the furring strips and on the
subfloor where the tub will rest.
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Then slide the tub into place and let
the adhesive set up. Typically it will take 24 to 36 hours for the adhesive to
fully setup.
After the adhesive has fully setup install a vapor barrier over the wall studs.
Use either plastic or felt paper. Make sure to overlap the plastic or felt paper
sections by at least 6 inches if you need to use multiple pieces.
Installing Backer
Board around Tub
Next, fasten the backer board to the wall studs, with the rough side facing
towards the tub.
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Fasten the backer board to the wall
studs with non-corrosive nails or screws, such as Rock-On screws. Place screws
or nails every 6 to 8 inches along the length of the wall studs. Then tape and
mud the backer board seams with a modified thinset mortar and an alkaline
resistant fiberglass mudding tape.
When attaching the backer board to the wall studs bring the backer board down
nearly even with the tub flange lip. You can then apply a bead of waterproof
caulk between the tub lip and the backer board. Then, when tiling the backer
board you can bring the tiles down over the tub lip and apply a sealant between
the tub edge and the ceramic tiles.
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If you prefer to overlap the tub lip
with the backer board a little, then back cut the bottom back edge of the backer
board so that you maintain a smooth transition from the backer board to the tub.
This will prevent the backer board from bowing inwards near the tub edge.
Make sure when installing ceramic tile above a tub or shower enclosure to use a
modified thinset mortar. Do not use mastic for fastening the tiles to the
backerboard. Over time the mastic will loosen and the tiles will begin to fall
off into your tub, and potentially crack or damage it.
Alternative Methods for
Installing backer board around a Tub
Another method for installing backer board around a tub is to first notch the
wall studs where the tub flange will intersect the wall studs, before installing
the tub. This way the backer board can be fastened to the wall studs and over
the tub flange without causing the backer board to bow inwards.
Another alternative approach for installing backer board around a tub is to
first fasten thin shims to the wall studs before attaching the backerboard.
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