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Old 05-25-2010, 03:15 PM   #1
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Wonderboard installation

Hi all

I and definitly not a tile installer but I'm helping my daughter install a tile floor. I went to Home Depot and bought 1/2" wonderboard as an underlayment, I asked the salesman if I need to install anything under the wonderboard, he said no just screw it to the subfloor, I did purchase the correct screws and screwed to the subfloor on every black dot, now I am reading that I should have used a mastic under the wonderboard, what are the possiblities that I will have a problem and what type of problems can I expect. I will mud and tape the top seams per the directions before setting tile, I can't remove the wonderboard because the cabinets have been set already.

Thanks for your comments and help
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Old 05-25-2010, 04:41 PM   #2
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The only variable is how long? There can be cracked grout, broken tile, both,
loose tile. It would be dusty but you could use a toekick saw and remove wonderboard. Or do it later when not only cabinets on there but tile also. Below directions are direct for Customs data sheet for WB install you should show that to the HD dude maybe you can save someone else.
Using a 1/4" (6 mm) square notch trowel, apply a
setting bed of polymer modified mortar to the subfloor.
Immediately laminate the WonderBoard to the
subfloor, leaving a 1/8" 3/16" (3 5 mm) space
between the boards at all joints and corners. Stagger
joints so they do not line up with underlying substrate
joints. While the setting bed mortar is still workable,
fasten WonderBoard every 4" 6" (10 15 cm) o.c.
throughout the board field and around all edges.
Around the perimeter of each board, locate fasteners
within 1/2" 1" (1.3 2.5 cm) of the edge. Fill all
joints with polymer modified mortar. On all joints and
corners, pre-fill the gap with bonding material; then
embed 2" (5 cm) mesh tape and smooth material over
the joint and corner.
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Old 05-25-2010, 07:00 PM   #3
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Also~Sad to say, but you shouldn't have used Mastic. The proper stuff is Morter.....comes inna bag and is mixed with water.....

"Women and cats will do as they please, and men and dogs should relax and get used to the idea."
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