new member asks advice

[northerntile]

We are about to lay 100m2 floor tiles onto a tarmac semi dry fibre screed. This was laid in December and left to dry for 6 weeks. The heating was then turned on gradually over 3 weeks. Expansion joints were formed in the screed splitting the floor into approx 4 . Expansion joints also across doorways and around periphery. There are just a couple of hairline cracks. Part of floor is to be in porcelain rest in limestone. Have been advised by several tilers that uncoupling membrane is not necessary just expansion joints above joints in screed. Any help would be welcome. Finally how should expansion jointsbe formed?

Thanks in advance

 

[nybor62]

i would use uncoupling membrane, even more so because of the limestone tile
as for the expansion joint, what type of premises is this ,

oh and welcome to the forum

 

[White Room]

Hi and welcome

All to the above

 

[Ian]

Welcome along

 

[SandyFloor]

:welcome:

 

[Colour Republic]

uncoupling would be an insurance policy

 

[Max@ableskills]

Hi and welcome to the forum. Great advice already given by nybor62

 

[northerntile]

Thanks to all for welcome and advice.The this is a domestic tiling project. There is an expansion joint between the dark porcelain tiles in kitchen and the light limestone in the living. A further joint in the middle of the limestone tiles

 

[nybor62]

what about thickness of tiles are they the same , and what about grout are you thinking of grouting them all with the same colour

 

[northerntile]

All same thickness 10mm. Porcelain tiles grey grout. Limestone a light grout

 

[The Legend; Phil Hobson RIP]

Hi and:welcome:uncoupling for me.

 

[Spud]

have you considered the, cost/effect ratio, I am coming to the conclusion that spending an extra £1250 on uncoupling matting / labour for a job like this may be a waste of money,the expansion joints placed correctly will deal with the coeffiecient of expansion between the tile and substrate, your money would be better spent buying extra tiles so if you were unlucky enough for a tile to crack you have spares to replace them, a couple of spare boxes of each will cost less than £200 far cheaper than the cost of the uncoupling matting

 

[karlm98]

you should be able to get a better deal with 100m2 shop around for Dural as it is a lot cheaper than Schluter Ditra...try Diatech they are very competitive.

use a 4mm trowel and grey flex standard set, pre cut dural and snap lines to suit

 

[Derry]

Hi, welcome to the forums

 

[DHTiling]

Hello and welcome.