Discuss Expansion Joints in the UK Tiling Forum area at TilersForums.com.

M

mick7

Hi All

You are probably all in bed, I'm still up trying to sort out the bits and pieces that need doing in a new extension.

As per previous thread I have a 3.5 deep new extension( 6 week old screed) which leads out from a 3.5 deep existing build ( concrete floor). Where the back of the old house was knocked out to build the new extension there are 2 pillars ( supports) .

There is no expansion joint showing in the new floor where the new meets the old and none has been specified in the plans?

How do I run a 7m length of 60 x 60 porcelain tiles through this area ???

Any ideas please.
 
G

grumpygrouter

Hi Mick, without seeing your floor I am guessing a bit but can you use the join between the two screeds as your datum and tile out from either side of that? If not check out the Schluter site, they do an excellent range of joints that look the biz and wouldn't be out of place in a domestic environment.

Possibly, as both surfaces are concrete, once they have settled you may not even need an expansion joint. In fact you may well be ok to use Ditra matting - this is designed for this sort of thing - see attachment

Grumpy
 
Last edited by a moderator:
M

mick7

Thanks for reply.
I have had a look as Schulter, just did'nt realise I should have an expansion joint. Really woriied about the look in the middle of a new floor. Definitely cant afford to do 50 sq metres with Ditra.
What I cant understand is that none of the tilers that quoted mentioned an expansion joint. Dont really know what to do. Do I let one of them tile it and chance it.
 
G

grumpygrouter

Mick, a 7m run of tiles on a floor doesn't really need an expansion joint. BS states they should run every 8 -10 m on a large floor or if there are different substrates to bridge. The only reason I mentioned the schluter is that you have an old concrete slab abutted against a new one. There may still be some movement in the new one for sometime and if you bridge the join with a tile it i may crack. If you use a good flexi adhesive it may help but I am not sure as I don't have enough experience yet to give a difinative answer.

What I will say is if you are putting down 50m2 of porcelain tiles that in itself is not cheap and it would be a shame to have to start pulling it up to make repairs. You can get 30m rolls of Ditra for around £6.50 per mtr (£195 +vat) and if it was me, I would use it for the piece of mind.

Good luck what ever you decide.:thumbsup:

Grumpy
 
M

mick7

I dont know whether I need ditra or not, I'm just trying to avoid a horrible joint line showing right in the middle of the floor. Its not the 7m run that worries me it is that at 3.5m the new screed joins the old floor ( all nice and level and sound at the moment1) and you experienced guys say there might be some movement that will crack out the floor.
Dont know what do do, and know one that has quoted has even mentioned it !!
 
D

DHTiling

Ditra will not overcome this problem mick...it is a crack isolation membrane and vapour equalisation membrane .. It will not act as an expansion substitute...
The builders should have put an expansion point where the old meets the new..no other way around it, apart from if they had laid a complete new floor throughout...You need to determine where they join at and put an expansion joint at this point be it a profile trim or silicone joint....good luck...
 
P

Proper Job

dhceramics is spot on Who ever says you don't need expansion joints is talking ********. Your going to get some kind of movement in the floor over time. Some really good advice has been given here. Schluter make great systems and are top quality and you pay the price. I would leave the floor for 6 weeks from when it was laided by the builder, you could if you wanted make an expansion joint your self in the floor using an angle grinder and grinding a line where the two floors meet and place some silicon in there good qaulity silcon will go up to 25 - 30 % expansion, When you come to tile the floor make sure you well prime it and place either an expansion strip over the top of the exsisitng one or use silcon as suggested mapei do silicon to match the grout and you can't tell. Best of luck mate
 

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