Tiles sound hollow under underfloor heating

[Alan Field]

Hi Guys,

I need help!! Basically I employed a cowboy and now there is a problem I can't contact him!

I had my floor tiled (over 200sqm) prior to turning the under floor heating on. Now the heating has been on and off for over a month the tiles sound hollow when I walk over them! I feel they will crack in time and I haven't moved in yet so need a quick solution!! Will i need to take all the tiles up? It's not all of them just 3/4.

Thanks in advance.

 

[J Sid]

the floor will need sand again when tiles are lifted to clean floor.
you need to lift some tiles to see if the adhesive is stuck to the floor or tile.
any expansion joints been put in ?

 

[Alan Field]

the floor will need sand again when tiles are lifted to clean floor.
you need to lift some tiles to see if the adhesive is stuck to the floor or tile.
any expansion joints been put in ?

I don't think expansion joints have been used? What happens if it's stuck to tile?

 

[WetSaw]

If the adhesive is on the tile and not the screed it tells you that either the floor wasn't prepared correctly and/or the wrong adhesive used.

 

[Bathfix Bob]

What makes you think he is a cowboy Alan? other than the tiles are loose?
I'm not saying he's not but what else has he done?
What is the quality like?

 

[Kyle Knowles]

I'm about 30 mins from chester

 

[Old Mod]

I'm about 30 mins from chester

C'mon Kyle, don't mince your words mate!

Lot of pressure on this job Kyle, with the forum watching your every move.

There we go Alan,
a free inspection on offer for you.

 

[Kyle Knowles]

C'mon Kyle, don't mince your words mate!

Lot of pressure on this job Kyle, with the forum watching your every move.

There we go Alan,
a free inspection on offer for you.

I eat preasure for breakfast I'm the Conor McGregor of tiling .... we're not here to take part we're here to take over

 

[One Day]

Good man Kyle, well volunteered!
Plenty of pics of the substrate and back of the tiles please.

 

[Kyle Knowles]

Good man Kyle, well volunteered!
Plenty of pics of the substrate and back of the tiles please.

That's Detective Inspector Knowles to you

 

[Flintstone]

That's the best thing this chap could do, let you round to determine exactly what's happening and give him the options, or option

 

[SJPurdy]

I don't think expansion joints have been used?

200m2 with no expansion/movement joints! Even if everything else was done correctly this is wrong and could be the cause of adhesive bond failing and the tiles becoming loose.

 

[Spacey]

Anhydrate catches alot of people out Knowledge is power
Can't count the amount I've had to replace due to failure from wrong preparation.
Those little crystals are a pain!

 

[Old Mod]

Those little crystals are a pain!

As is having to delete bad language!

 

[Spacey]

As is having to delete bad language!

Soz boss it just flows out

 

[Bathfix Bob]

Who knows what bad language lurks around the forum in previous posts, 3_fall had to delete a whole thread the other night that some idiot brought up from 10 years ago due to an appauling but funny story.

 

[Kyle Knowles]

I think we need a charity swear box

 

[Time's Ran Out]

No just a bit of respect for the Admin and moderators who have to delete it all!

 

[Spacey]

I think we need a charity swear box

I don't I'd be skint

 

[Qwerty]

I don't I'd be skint

No, you would be banned!

 

[Spacey]

Boxing's started man

 

[One Day]

200m2 with no expansion/movement joints! Even if everything else was done correctly this is wrong and could be the cause of adhesive bond failing and the tiles becoming loose.

Pretty sure that Ajax would say you don't need expansion joints actually. Anhydrite screed expands far less than usual. I'd still insist on ditra at that size though.
(yes, I know it's contrary to bs5385)

 

[J Sid]

but still need movement joints ? As the tiles would expand at a different rate to the screed but the Ditra may accommodate this movement

 

[Spacey]

Anhydrate isn't really a screed it's more related to plaster.
Its a bi product they needed to find a use for Builder's love as it's cheap pre mixed a great thermal conductor goes down smooth but most importantly for Builder's it dries quickly Randomly but quickly

 

[Old Mod]

yes, I know it's contrary

Not having that Mark, would never describe you as contrary!

 

[Spacey]

How do we deal with Anhydrate, Hemihrdyate subfloors?

 

[Kyle Knowles]

I don't I'd be skint

To be honest so would I I have a filthy mouth I'm trying to stop tho coz Mt 4 year old keeps copying me lol

 

[Simons70]

How do we deal with Anhydrate, Hemihrdyate subfloors?

Apply 2 coat of Kerakoll Primer A Eco Water-based surface primer that neutralizes the expansive chemical reaction of gypsum or anhydrite based plasters and screeds on contact with cement-based adhesives

 

[WetSaw]

Apply 2 coat of Kerakoll Primer A Eco Water-based surface primer that neutralizes the expansive chemical reaction of gypsum or anhydrite based plasters and screeds on contact with cement-based adhesives

...after removing the laitence of course!

 

[One Day]

The most bullet-proof method I know is
1 Remove laitence
2 Vac thoroughly
3 One coat chosen primer diluted (to reduce absorbtion)
4 Fix ditra with tm anhyfix adhesive
5 Fix tiles using whatever you like to use.
6 Good job, well done, sleep easy.

 

[Kyle Knowles]

The most bullet-proof method I know is
1 Remove laitence
2 Vac thoroughly
3 One coat chosen primer diluted (to reduce absorbtion)
4 Fix ditra with tm anhyfix adhesive
5 Fix tiles using whatever you like to use.
6 Good job, well done, sleep easy.

I wonder if this guy is ever gonna come back online I was actually looking forward to goin to represent the tilersforums and let him know what's what