tiling over ufh

[glevans]

some of my ceramic tiles have lifted for a second time. i laid them over a concrete screed using flexible adesive and flexible grout.i coated both the floor and tile with pva and water mix.the room is 3 metres square and has underfloor heating.i do not think i needed an exspansion joint.please help garry

 

[DHTiling]

The PVA is the problem.

Someone will link to why as I am on mobile at present.

 

[Time's Ran Out]

:welcome: and good luck - if I had the knowledge to link I would but unfortunately I can just type!

 

[Waimzer]

From Daves Post...http://www.tilersforums.com/tile-adhesive-grout-substrate-preparation/2511-p-v-versus-primers.html

Some great info there! Take a good long read =)

 

[Rich]

P.V.A. Versus Primers


Ta Da!!

 

[kilty55]

oops...

 

[stu-180]

PVA is a BIG no no.

 

[RichieRich]

PVA's a no no. Primer always!!!

 

[northstar]

any pictures ?

 

[rambo2]

Such a nice one.Thanks for sharing.