Discuss Expansion joints, cracks and Pecilastic in the UK Tiling Forum area at TilersForums.com.

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I've a largish stone floor to tile that I've mentioned on here before. The largest area being about 10m x 5m. It has UFH and I'm thinking it may well need expansion joints. Although it's a new build there's no way of contacting the architect, so no discussing with him. I think I'll have to write a disclaimer on this one as there's no info on the screed etc.
My question is, can I simply tile as normal but fill joints with silicone where exp. joint is required? I think this might look less offensive running through natural stone than a Schluter strip.
Also, the tiles come in varying sizes so I'll have straight lines running one way but a staggered joint in the other direction, so how do I put an expansion joint in? Would I have to "cut through" the pattern? Or would it be sufficent to only have a joint running across the 5m (in the direction of the straight line)thus breaking up the 10m run, or do I need expansion joint in both directions?
One more thing, there are some cracks in places so I was thinking of filling with expoxy and covering with Pecilastic. Does this sound suitable and does anyone know where I can buy Pecilastic? - I live near J1 of M3 if that helps. Sorry, there's about 5 threads rolled into one here!
 
B

brundlefly

I find customers hate expansion joints, when they have said definitely no to a break in the floor ive put 10mm around perimeter & skirts on top, joints at doorways, full coverage with pecilastic, Which is a lot thinner than ditra and no need to fill the doves

I did some repair work to a stone floor a while ago,
I spoke to a PCI rep about cracks & pecilastic, as a work around
Chop out the crack (check the depth of the UFH) & fill with flexible silicone and cover with the matt, About 200mm strips which ive done about 12 months ago with no problems

Any chance you can start from a main doorway and put joints on all door ways
& a perimeter expansion with full coverage with the matt

Pecilastic & nano lite adhesive from PCI I think CTD will order it in
 
Last edited by a moderator:
U

Uheat

I'd ask Aaron to see if the ufh acts as an uncoupling membrane in this case then you might not need the expansion joint.Grumpy seems right on but I don't know how the ditra would work with your ufh.


Wet or Electric UFH Paul


It sounds like a Wet system as it being a new build. I think David is right with the expansion joint but i think should be closer if using ufh.

I think Grumpy has given some sound advice
 
W

wetdec

Yes your right about the gap around the outside.

On the floor question you need to use a true uncoupling membrane, by that I mean one whos lower membrane actually fractures on the screed moving. This would mean as Grumps has said Schluter or Durabase.

Pecilastic and Dura-wp allow movement but are elastic based fleece tear membranes more suitable for wood substrate, not as suitable for your job in my opinion.


..
 
9
278
Sorry, yes it is wet UFH. The problem with dittra is the thickness and to cover all would be at such a cost. If i did a local, i would probably have to skim some off the screed - unless I try to lose the thickness difference with adhesive.
So can I use silicone as an expansion joint and is there a suggested joint thickness?

Cheers.
Oh yes, I will be leaving a joint around the outside beneath the skirts.
 

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