Decoupling membrane - TilersForums.com

[judge]

Ive a job to look at friday eve to tile in 600 polished porcs(15 m2) .My concern is that roughly half the floor is existing concrete screed layed on top of insulation board,and the other half is fresh(2 month) screed over insulation.Would a decoupling membrane and flexi addi suffice for any movement which will take place between the two screeds ?:smilewinkgrin: ta

 

[White Room]

No, I would use an expansion joint between the 2 surfaces....

 

[foggy34]

i would do as above,expansion where the 2 screeds meet

 

[judge]

with the expansion would you ,put a cut between the screeds and fill with silicone first ? and if possible would you run the tile grout line along the joint and fill with a matching silicone or install proper movement joint ?:smilewinkgrin: cheers

 

[Del W]

Go for a proper movement joint.Some customers dont like these in their floor,but tell them it really is the way to go.

 

[foggy34]

i would try for the grout joint to run along screed joint, then match silicon with grout! mapei especially good silicon and grout matches
altho this may not be possible but all gud advise above

 

[judge]

Went to look at the job and it was two concrete slabs joined that had the celotex on top then a 60mm screed layed over it ,so all was well :hurray:. apart from the fact that the screed is still to wet to tile on yet .