Decoupling Membrane

[Matt]

I see alot of mention of decoupling membranes on here (Never heard about them until this site). I know very little about them and wondered if someone could explain alittle about them

[doug boardley]

Dave will probably post a link Matt, before I've finished typing this!!

[doug boardley]

the romans used sand to the same effect....

[Matt]

Just realised I put uncoupling not decoupling! Glad I can edit

[doug boardley]

basicaly Matt, they act as a buffer between the substrate and the finshed floor, usually in the form of a fleece type sandwich that tears under stress from the substrate, thus stopping the tiles cracking

[whitebeam]

Dave put a great post on here about decoupling membranes http://www.tilersforums.co.uk/tiling...ing-shift.html

[doug boardley]

that's the one i was on about!!! (gonna have to learn to post links)

[whitebeam]

I thought I was bad with computers

[Matt]

Just read the link and also watched a video on youtube. Looks like a great product. Is it expensive?

[whitebeam]

Ditra at per m2 from some tile suppliers can cost £12-12.5 m2, buying a roll can be cheaper. Wetdecs does Durabase which does the same job but works out cheaper (off hand can't remember the price).

[Rob Z]

i Matt

One thing to note about using Ditra is that the waffles drink more thinset, so your coverage per bag will be down. Be sure to add that into your estimate if you end up using Ditra.

Also, they now have the super Ditra (I don't recall the name), which is much deeper and really hogs the setting material.

[wetdec]

Ditra at per m2 from some tile suppliers can cost £12-12.5 m2, buying a roll can be cheaper. Wetdecs does Durabase which does the same job but works out cheaper (off hand can't remember the price).

Here...............http://www.tilersforums.co.uk/tilers...at-prices.html

[wetdec]

Ditra at per m2 from some tile suppliers can cost £12-12.5 m2, buying a roll can be cheaper. Wetdecs does Durabase which does the same job but works out cheaper (off hand can't remember the price).

Here...............http://www.tilersforums.co.uk/tilers...at-prices.html


Different guys are on different rates so ALWAYS ask...............

[Dave]

i Matt

One thing to note about using Ditra is that the waffles drink more thinset, so your coverage per bag will be down. Be sure to add that into your estimate if you end up using Ditra.

Also, they now have the super Ditra (I don't recall the name), which is much deeper and really hogs the setting material.

I asked schluter uk if they were going to be doing the Ditra XL over here rob....no reply...

[Rob Z]

Dave

A couple guys I know here have used it and have told me that it works pretty well. I haven't had the need for it yet and continue using the regular Ditra.

[Dave]

Rob..what is the idea behind the thicker membrane then...?..what purpose would it have over standard ditra..?

[Rob Z]

Hi Dave

I think the Uber-Ditra (that's what it got nicknamed here-Sorry MG ) was originally brought on to be used over single layer ply or Beaver Barf, and to allow an even transition to adjoining hardwood floors. It supposedly tests out so that it can also be used on floor systems with single underlayment and 24" OC joist spacing.

It does seem incredible to me that this stuff will work over 24" OC, which is many times a very, very bouncy floor .

[Dave]

So it more for deflection and lateral expansion than the 3mm one...i asked schluter uk about it and got no reply..maybe they do not intand to introduce it here...

schluter uk have different advice about using ditra to what the usa gets..like you are told not to use a modified thinset to tile with , yet we are told it is fine...?

[Rob Z]

Hey Dave,

That modified/non-modified thing really bugs me. My experience with many, many rolls of Ditra and Kerdi installed, is exactly the opposite of what Schluter says.

I don't get it.

[Dave]

How i see it rob is that your guys say modified takes longer to set on ditra...?????? why..? A cement based adhesive dries hydrolicly...so as long as it bonds to the ditra then modified or not as long as it sticks..and surely if tiling on to timber substrates then modified for slight deflection is a must...even if using ditra because it combats lateral stress and not deflection.....i have tried as you know to get answers on jb before finally getting an answer from schluter uk...

So i use modified for timber and both modified or unmodified depending on ufh etc on concrete substrates.

[Matt]

Hoping to get the Ditra Matting instock at my store soon