expansion joints

[trm]

Hi all,

For the past year i have done alot of work for a shop fitter and i always use expansion joint every 5m. However on my travels i tend to some times see other tiler have not used them. Just wondering why not aprt from the obvious. or is it due to the fact they use a single part flexi adhesive?

[Phil Hobson]

Hi trm, no excuse for lack of expansion joints imo. flex adhesive or not

[blocko]

I think sometimes when one isnt used, that they have used an uncoupling membrane such as ditra instead. I have seen this done anyway. Not sure if it is good practice though to do that instead of a specific expansion joint/ profile

[Phil Hobson]

Uncoupling membrane goes hand in glove with expansion joints in my book, not one or the other

[TF Ed]

phil hits the nail on the head!!

expansion joints are for structural movement/settlement
de-coupling membrane is for lateral expansion/contraction

2 different impacts, 2 different solutions..

[chrisprendy]

yes i would agree with phil on this one ,they even make a larger edge tape for over exp joints (if memory serves)

[doug boardley]

yes i would agree with phil on this one ,they even make a larger edge tape for over exp joints (if memory serves)

I stop uncoupling membrane at expansion joints and start it again the other side of joint.

[Phil Hobson]

I stop uncoupling membrane at expansion joints and start it again the other side of joint.

Quite right Doug, uncoupling membrane should not span expansion joint. I break under the exp joint

[chrisprendy]

phil i meant the flex edge strip to bridge each side of the joint,(waterproofing) i didnt mean to just lay it right over M8