mastic problem

Name: Jim
Posted: Sat, Apr 3, 2010 at 2:35 am MST
The mastic I used to set my tiles wont dry. it's been 3 days and the tiles still move. I put down Schulters underlayment then the mastic then the tile. What's up with that?
Name: Stan
Posted: Sat, Apr 3, 2010 at 3:27 am MST
Reply: 1
You should have never used mastic. It's garbage. You have to rip it all out and start from scratch. The Schluter was the right way to go so you were at least off to a good start.
Name: Josh
Posted: Sat, Apr 3, 2010 at 7:34 am MST
Reply: 2
What's up with that?
You need to get a copy of schluters installation manual
It will explain it. You need to use an unmodified thin set over ditra. Ditra is plastic, Latex modified products need air to dry. With ditra below and tile above the grout joints are the only place for air to get into the mix.
Un-modified thinset depends on the presence of moisture to cure. This is hydration. Because ditra is impervious to moisture, this allows proper hydration and cure in about 24 hours.
Hopefully that gives you an explanation as to why it isn't drying. Then you probably need to follow Stan's advice or be prepared to wait 14 to 60+ days for it to cure.
Name: Rd Tile
Posted: Sat, Apr 3, 2010 at 7:46 am MST
Reply: 3
Mastic should never be used over anything on a floor, start over, sorry.sad
Name: Jazman
Posted: Sat, Apr 3, 2010 at 12:25 pm MST
Reply: 4

Please help us inform others how you decided to use mastic instead of the proper thin set mortar.

It's already been explained, but in short since there is plastic under it, and tile above it, the mastic thinks it's still in the bucket.

Name: Brian
Posted: Sat, Apr 3, 2010 at 5:27 pm MST
Reply: 5
Hi Jim,

Although Mastic most likely isn't right adhesive for you project, no one has explained why.

You'll find a nice explanation here.
Name: Bud Cline Tile
Posted: Sun, Apr 4, 2010 at 12:20 pm MST
Reply: 6
no one has explained why.

NONSENSE! Josh explained it! Jaz explained it!
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