When installing greenboard around a tub with an integral "tiling flange," should I install the green board down to the top of the flange or extend it down over the flange to rest directly on the tub edge or shelf? The flange extends 7/8" up from the tub edge (or shelf), is 3/8" thick and is butted against the surrounding wall studs.

Also, the flange has some small holes in it that the original installer used to screw the flange into wall studs. Is that right? It seems that doing so might put undue strain on the flange if the tub settles and would also be a near-guaranteed source of leaks.

Thanks.
Blll

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Originally Posted by Blll

When installing greenboard around a tub with an integral "tiling flange," should I install the green board down to the top of the flange or extend it down over the flange to rest directly on the tub edge or shelf? The flange extends 7/8" up from the tub edge (or shelf), is 3/8" thick and is butted against the surrounding wall studs.

Also, the flange has some small holes in it that the original installer used to screw the flange into wall studs. Is that right? It seems that doing so might put undue strain on the flange if the tub settles and would also be a near-guaranteed source of leaks.

Thanks.
Blll

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Hey Bill,

This calls for a drywall guy to answer but all the tubs I've ever installed had the drywall over the lip and then tile down to the tubs edge.
If the tub sets on a runner or 2X4 jacks in the back wall then securing it to the stud to make certain it won't move makes good sense. If you have doubts about the tub flexing or giving when you step into it then you must bed under the floor of the tub with mortor or cement. Good luck, Tom