When Do You Uncouple?

[Dhtiling]

I agree with you totally. I was referring a bit to dhtiling saying he puts a mat on every wooden floor. - no need.

At the end of the day, I am charging the same price for cement board or membrane. It is cheap insurance in my mind since wood moves and tile moves at different rates. Also you guys have courses and trainings for tiling, many guys here don't and there are a lot of failures because of improper installation, people see why and it is usually cement board or hardi installed wrong, so customers who research things feel more comfortable paying for the mat.

 

[hmtiling]

I'd like to know how there can be lateral movement in nmp boards glued together

I've seen nmp split due to lateral movement and not deflection. If the sub floor moves enough nmp will go with it. Ditra and nmp would have worked on that job but like you say, who's gonna pay for both here!

 

[J Sid]

I've seen nmp split due to lateral movement and not deflection. If the sub floor moves enough nmp will go with it. Ditra and nmp would have worked on that job but like you say, who's gonna pay for both here!

as have I 🙁

 

[Flintstone]

Must have been a pretty shocking floor. I can't see there being much lateral movement in your average floor board or chipboard bathroom or kitchen.

 

[hmtiling]

Must have been a pretty shocking floor. I can't see there being much lateral movement in your average floor board or chipboard bathroom or kitchen.

That's the thing, it wasn't. No sign of deflection at all before or after the nmp and tiles split.

 

[MW Smith Ceramics]

Hi Hm,

That's a first,

I use nmp and hb all the time & never had any issues.......

Just out of interest what was the subfloor you layed nmp and tiles onto as I'm baffled by this??

Thanks

 

[hmtiling]

Green chipboard. It was a first and only for me too. Some cracks appeared in the decorated walls as well. Must have been some structural movement. Not a new build either. Used tons of nmp too.
Replaced cracked tiles and board for free and the customer didn't offer me anything. Not even a brew!

 

[MW Smith Ceramics]

Green chipboard. It was a first and only for me too. Some cracks appeared in the decorated walls as well. Must have been some structural movement. Not a new build either. Used tons of nmp too.
Replaced cracked tiles and board for free and the customer didn't offer me anything. Not even a brew!

Crikey mate,

Gotta have been structural movement then , so when you took up the area of tiles and nmp had the chipboard been affected??

 

[J Sid]

Hi Hm,

That's a first,

I use nmp and hb all the time & never had any issues.......

Just out of interest what was the subfloor you layed nmp and tiles onto as I'm baffled by this??

Thanks

not a first, happened to me. 🙁

 

[MW Smith Ceramics]

Green chipboard. It was a first and only for me too. Some cracks appeared in the decorated walls as well. Must have been some structural movement. Not a new build either. Used tons of nmp too.
Replaced cracked tiles and board for free and the customer didn't offer me anything. Not even a brew!

ot

I've seen nmp split due to lateral movement and not deflection. If the sub floor moves enough nmp will go with it. Ditra and nmp would have worked on that job but like you say, who's gonna pay for both here!

It's defo a fail safe if we could nmp or hb and also decouple with real problematic floors but when the next fixer comes in at half your price you lose the job......oh man!....can't win!......I have suggested this on numerous occasions and I just get the raised eyebrow or 'no that's going too far'.........so I just quoted for a 60m2 floor kitchen diner, ....very expensive tiles had been purchased, so at present half or the area has been tiled and its failed - ( cracks , debonding, etc ) & half laminate which is also not great, very loose & a lot of movement there......so I've took a few tiles up and not surprising it looks as tho the previous fixers have used a 2 part adhesive onto the floorboards & it's gone **** up.....took some of the laminate up too & everywhere is floorboards.......so I suggested over boarding with 9mm nmp stuck down staggered glued with polyurethane adhesive under and where boards butt together and screwed and also just to be safe Bal rapid Matt.......I didn't get the job , another tiler came in £1500 cheaper than me..........