Wrong Adhesive/Thinset over Kerdi? Panic mode
gbsim1
15 years ago
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MongoCT
15 years agoRelated Discussions
fully Kerdi'd
Comments (47)For Kerdi over Hardie, I'd use either an unmodified thinset or a lightly modified thinset. Remember, the more modified the thinset is, the more free air it need access to so that it can dry. The portland cement part of thinset is a chemical cure, it needs no air. The latex modifier needs access to air to dry. With air unable to pass through Kerdi, it can't dry really well, that's why you don't want to use a heavily modified thinset. So unmodified or lightly modified. You're using Kerdi, so you don't want them putting 6-mil plastic behind the hardie, nor do you want him putting his mystery membrane on the hardie before the Kerdi goes up. Or over the Kerdi after the Kerdi is up. The Kerdi is all that you need. A membrane bonded to another membrane would still count as just one membrane. What you don't want is one membrane behind the hardie (like 6-mil poly) and another in front of the hardie (like Kerdi). That would be a double vapor barrier. The Kerdi is all you need. Note the repetition? How do you tell him to not use his mystery membrane? Say "Do not use your mystery membrane that you don't even know the name of in my bathroom." If he asks why, say "Because my unknown cyber-friend named Mongo, who I've never met, said so." And so it must be......See MoreAre all mastics created equal?
Comments (21)I would if I were you. You have two things going against you. First, mastic shouldn't be used in a wet area. The reason is that even after it's been dry for years, it can still reimulsify (become soft) from contact with moisture. Secondly, even in dry areas where mastic CAN be used, it's not supposed to be used for anything bigger than 8x8 tile. The reason for that is that if you apply mastic too heavily (as you would need to with the larger tiles-- anything bigger than 1/4x1/4 is too big for mastic) then it won't dry, and if you use a 1/4x1/4 notch then you're not getting the coverage you need to have. So now, either you don't have enough adhesive behind the tile, or it's going to stay soft, which means it'll wash out from behind the tiles all that much quicker. Take the tiles down....See MoreHelp, Kerdi did not stick, What happened ??
Comments (51)Kerdi board is my go-to product as it is the only one locally available in 4x8 sheets. Someday USG will have them. WHen that happens I will switch to the USG board. I use Noble seal for shower pans as they are the only ones who make 6 foot wide rolls. We use Hydroban to seal difficult areas to avoid too much buildup from the sheet membranes. We use GreenSkin for flooring. Its nice to have a selection of products for different applications. The tile itself, whether the drain is centered or linear, if there is a curb or not, curved walls.... each has its own factors when choosing waterproofing....See MoreShout out to Bill V. and other tile experts
Comments (15)numbers... we have a chipper tool with an attachment that is specifically used to chip tile. Professional tile installers use a VERY heavy duty one. Ours was heavy but not quite as heavy as the biggest pro models. It's a bear of a job. Just dusty, heavy, time consuming, and allow me to say dusty again. You will need two people. One for cleaning up the debris and the one using the tool. It took us several days to do about 1000 sq. ft. In the beginning , DH had to do the work alone because I was at work. THat meant stopping every 15 minutes to clean up the broken tile in the way. You'll also need a way/place/trash to dump the debris and get it taken away. It gets very heavy very fast. The tile we removed was at least 20 years old if not older. They are right... it's a huge amount of work. But it's doable, if you have help and just give yourself the time to do it. We are lucky in that we don't have to live there while the job is being done....See Moregbsim1
15 years agobill_vincent
15 years agogbsim1
15 years agoMongoCT
15 years agosombreuil_mongrel
15 years agoterezosa / terriks
15 years agoMongoCT
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13 years agoBernard0466
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11 years ago
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