Drywall shims found around tub flange

[FlyByNight69]

Been reading posts here for awhile and have been getting alot of great tips from everybody here. Thanks

Got a question on the use of the cardboard drywall shims used behind concrete backer board. Found them today when I removed the drywall and tile from the shower/bath tub. It looks like they where using them to make up the diference between the tub flange and the backer board. There was no vapor barrier and not sure if the backer board was waterproofed or not.

Is this a good idea or not? Was going to put backer board back up over top of it with a vapor barrier but started thinking and read through posts here and did not see anything like that mentioned in any posts.

Thanks for your help

[TileArt1]

Hi Todd, Welcome to the forum.

You can use the cardboard shims, I do it. Just make sure they are behind your barrier. If you are using plastic behind your backerboard put up your shims, then plastic, then board. If you are using a sheet or liquid membrane just put your backerboard right over the top of the shims.

[FlyByNight69]

Thanks for the reply Roger or should I say neighbor I live up in Littleton. Sorry I did not get back to you sooner called called out on a trip shortly after posting. Just was not sure after every thing else I have had to fix around the house.

Todd