underfloor heating......do I have a potential problem ?

[DHTiling]

Too much lateral stress..( side ways movement) can cause them to heave.. are the loose ones or this creaking area towards the middle of the floor..?

 

[jonjo]

Not really no.. so 100 mtrs in a run might just add way too much lateral stress..

sorry if im not on topic here but its 100sqm accrued in 4 seperate areas but all are flowing into each other if you get me

 

[jonjo]

Too much lateral stress..( side ways movement) can cause them to heave.. are the loose ones or this creaking area towards the middle of the floor..?

no they seem to be here there and everywhere...no real pattern

 

[DHTiling]

So.. what is the largest separate area..? and i take it is doorways separating,.

 

[Dan]

You need expansion joints where different rooms meet, every 10 meters on large floors in length and width, and even if the rooms are knocked through, I'd still have one somewhere for the sake of each end of the room having slightly different heat-up and cool-down times due to all sorts of factors, oven at one end, patio doors at the other for example.

 

[DHTiling]

Less than 10 mtrs Dan with UFH.. Around 7 max i would say. and perimeter joints a must

 

[Dan]

Ta Dave. I'll remember that.

 

[DHTiling]

Even less with no matting....

 

[jonjo]

So.. what is the largest separate area..? and i take it is doorways separating,.

starting from the open plan kitchen it runs through to the hallway through what was a two seperate doors now knocked into one, then through the original doorway into the living room, from there through an open plan opening into what i call the sun room.

all was re screeded all be it the hallway was done seperatley to the kitchen and living room(sun room runs off living room) so the hall is in affect in the middle of the two large areas but tiles run smooth through the lot

clear or not ?

sorry i'm not builder / DIY'er !

the largest area if you like is the kitchen which is circa 50sqm but this does run through to the hall and living and sun room

 

[jonjo]

You need expansion joints where different rooms meet, every 10 meters on large floors in length and width, and even if the rooms are knocked through, I'd still have one somewhere for the sake of each end of the room having slightly different heat-up and cool-down times due to all sorts of factors, oven at one end, patio doors at the other for example.

i dont think i have these...i remember the tiler mentioning them but said ditra matting would eliminate the need for them ??

 

[Dan]

And did you say there's no UFH in the hallway?

That aside, sounds like you've found your problem. Two many rooms with different heat factors to cope with expansion with no expansion joints. Especially if tiles run from a heated floor, to one not heated, and then back to a heated floor the other side of the hallway (if I did read your earlier post correctly).

And you said the tiler said it's okay without strips when you have a de-coupling membrane, which isn't right. So you've got your culprit there too.

 

[jonjo]

And did you say there's no UFH in the hallway?

That aside, sounds like you've found your problem. Two many rooms with different heat factors to cope with expansion with no expansion joints. Especially if tiles run from a heated floor, to one not heated, and then back to a heated floor the other side of the hallway (if I did read your earlier post correctly).

And you said the tiler said it's okay without strips when you have a de-coupling membrane, which isn't right. So you've got your culprit there too.

yes he knew no ufh in hallway.....

i'm gutted, what should i do ?

he made it clear that he wanted to do the job properley and that he would not lay the floor without this ditra which as you know over 110sqm was a cost i was not expecting until he mentioned it (remember im no tiler) so i went the proper route or so i thought !

 

[DHTiling]

Have you contacted the tiler..?

 

[jonjo]

not yet

i want to get my facts stright or as best as poss so i dont get rolled over so to speak.

 

[DHTiling]

We appreciate that but this is deffo an installer error from what you have described..