Tile Installation: Backer Board Around a Bathtub

Finally – the tile backer/tub lip problem resolved

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Tile Installation: Backer Board Around a Bathtub

Does tile backer board lap over the bathtub lip, or sit on top of it? It’s a question that’s puzzled first-time bathroom remodelers for years. This article explains the correct method.

By the DIY experts of The Family Handyman Magazine: October 2009

Cement board detail

The best approach when installing cement board or other tile backer around a tub is to keep the cement board out of the lip area. Apply it to the wall with the bottom edge about 1/4 in. above the lip of the tub. Then apply a generous amount of thin-set to the bottom tile and position it 1/8 in. above the tub. Fill the gap between the tile and the tub with caulk.
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Required Tools for this Project

Have the necessary tools for this DIY project lined up before you start—you’ll save time and frustration.

    • Hammer
    • Cordless drill
    • Caulk gun
    • Notched trowel

Required Materials for this Project

Avoid last-minute shopping trips by having all your materials ready ahead of time. Here's a list.

    • Thinset mortar
    • Caulk
    • Tile backer

Shopping List

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Comments from DIY Community Members

Share what's on your mind and see what other DIYers are thinking about.

1 - 6 of 6 comments
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lpruitt

April 25, 12:56 PM [GMT -5]

This is exactly what I've been looking for. Thank you Handyman

mi

September 20, 9:52 PM [GMT -5]

this picture is awesome. that's exactly what i was looking for. the whole time i am wondering how in the world would the backer board be on top of the lip of the tub?? if you put the backer board all the way to the L lip on the tub, then the bottom of the tile would bulge outboard and look ugly.

thanks so much for the cutaway view. that's awesome.

Rtist4u

August 08, 3:32 PM [GMT -5]

The tiles in my shower/tub have come loose and fallen out around the faucet for the tub. I need some advice on how to replace them without having to tear apart the entire wall, if possible. The cement board behind the old tile has disenegrated and will need to be replaced. How do I find the proper materials to repair it?

bhgedeon

July 25, 9:44 PM [GMT -5]

Got it, but what if the lip for your tub surround measures over 3 inches? Should the backerboard overhang the fiberglass lip? Related - how should I affix the lip to the studs? On one side, I have a good 1/4 in. gap between lip and stud. Thanks!

TeXan

April 23, 12:13 PM [GMT -5]

Consider adding a vinyl membrane behind the cement backer board.
when setting the tile leave a little gap between the tub and the tile to allow a space for the silicon caulk.

whoozatt

December 15, 7:53 PM [GMT -5]

KOOL!

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Tile Installation: Backer Board Around a Bathtub

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