Grout coming out and crackling noise under some tiles

[Flintstone]

Best option here is to remove a tile and post a photo, if possible

 

[Rookery]

Bl@@dy anhydrite screeds

 

[Tile seller]

I had a situation recently where the screed hadn't been abraded well enough or the ensuing dust hadn't been hovered up causing a tanking membrane let go. White dust was all over the back of said membrane.
This customer just used a hand held sander to abrade and I believe that something more substantial is required.
I wonder how this screed was abraded.

 

[Andy Allen]

Not trying to be funny.... But are you sure your builder was qualified enough to prepare such a specialist screed ?
The fact it failed the first time due to some very basic errors wouldn't be giving me much confidence he's up to the job.
Unless these screeds are prepared absolutely spot on then they will fail, and saying the grout is cracking due to it not being pushed in enough to fill voids is absolutely ridiculous....... There shouldn't be any voids in the first place.

 

[Old Mod]

Removing laitence from the floor is not just a case of a quick skim over or using a scrapper.
What method did he use and what equipment?
This year I ripped out and refixed an anhydride floor, which I know 100% was sanded by the contractor.
The reason I know is the client made a point of asking what they were doing.
The Builder then continued to install the floor with his Tiler.
9 months later it failed, on inspection, laitence was still present, it failed.
So we had to start from scratch, including re sanding of the floor.

The moisture reading using the hygrometer, how long were they left in place before readings taken?

 

[Dave]

80 sqr mtrs ?
Where any expansion joints used ?

 

[Sachin Parab]

80 sqr mtrs ?
Where any expansion joints used ?

No none were used, that was my other query to the builder. Is there any way this can be added now.

 

[Sachin Parab]

Thanks all for all your input.

Is there any remedy through this which will avoid taking tiles off the third time as all my stuff is in or the best way would be to repeat the same again with suggested procedures.

 

[Dave]

No none were used, that was my other query to the builder. Is there any way this can be added now.

What is your biggest area , too large an area without expansion can cause delamination.
Just another thought on your issue.

As mentioned , you need to lift a tile and see whats going on underneath.

Are any expansion joints in the screed ? Ie doorways etc ?

 

[Sachin Parab]

The largest area is around 20 square meter. No expansion joints on the doorway or any other areas