Remove wallpaper? [Archive] - Ceramic Tile Advice Forums - John Bridge Ceramic Tile

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lesaunders
02-17-2013, 06:35 PM
Should the wall paper be removed from the walls before we use the Kerdi?

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jadnashua
02-17-2013, 06:47 PM
Absolutely...and, you may find, depending on the glue used, before you use anything on the walls, they need to be well cleaned off, or in a worst case, the drywall replaced or new applied over it (they do make some 1/4" stuff for resurfacing, which might be easier than stripping and cleaning what's there).

lesaunders
02-17-2013, 06:56 PM
Our tile man said only the loose wall paper should be removed because the Kerdi barrier would adhere without any problem. Anyone agree?

Executive Flooring
02-17-2013, 07:33 PM
Larry, Like Jim said above, wallpaper MUST be removed. I personally wouldnt even trust doing Kerdi over the remaining glue/adhesive from the wallpaper. Drywall is cheap and easy to replace. Spending a few extra bucks now to do it right, saves a lot of time and money in the end. If your tile guy is saying to Kerdi right over the paper, it might be time to find a new tile guy...

Tool Guy - Kg
02-17-2013, 10:58 PM
...said only the loose wall paper should be removed because the Kerdi barrier would adhere...It will likely adhere. But that's NOT the issue...

Wallpaper glue is water soluble. There is a lot of water in the thinset that will be used to install the Kerdi. The moisture from the thinset will remain in contact with that wallpaper for quite some time before it dries away. The wallpaper glue will get wet and the bond between the paper and the drywall will potentially come loose.

Absolutely, positively get rid of the wallpaper and remaining glue before you install the Kerdi.

:)

lesaunders
02-18-2013, 07:22 AM
Thanks, guys. I will drywall over it.

ss3964spd
02-18-2013, 07:32 AM
Make sure you think the drywall over it idea all the way through, Larry. If there are doorways, windows, etc that you have to go around adding another layer of DW, even 1/4", will mess with your door/window jambs. The new DW will be proud - forcing the use of jamb extensions.