Water UFH Need help please - Tile Advice

[Alan Field]

hi Guys,

Please could you help.

I have employed a professional tiler and I'm a little concerned and don't know how to tackle it.
Basically I have had an area of 144sqm of underfloor heating installed and we haven't had the heating on yet. The screed was laid 3 months ago so should of fully cured by now.
When I was receiving quotes from the underfloor heating firms one told me I should be putting an expansion membrane between the tile and the screed if I wasn't turning the heat on before the tiles?? Also he said it would help with the expansion anyway as it was such a big area??
1. Is this correct? 2. What is it called and where can I get it from and the big one 3. Why hasn't the tiler asked me for this??? I don't want to just confront him as I am a tradesman and there is nothing worse when a customer tries to tell a professional how to do his job??

 

[WetSaw]

What type of screed? How thick? Type of heating? Type of tile?
So many questions!
Any expansion joints in the screed?

 

[hmtiling]

1 What type of tile?
2 What type of screed?
3 depth of screed?

Heating should have been commissioned. Moisture tested. As above

 

[Alan Field]

Hi,
1. Porcelain
2. Thermio
3. 50mm

Heating can't be commissioned as waiting on new gas line?

 

[Alan Field]

No expansion joints in the screed.

 

[WetSaw]

Has the laitance been removed from the screed?

 

[hmtiling]

If the tiler has sanded off the laitance, tested for moisture, using gypsum adhesive or a barrier primer, incorporated expansion joints and allowing for expansion around the perimeter then you've nothing to worry about.

 

[White Room]

I take it the tiles haven't been fixed yet ?

 

[Alan Field]

He hasn't started yet. What is the matting/barrier film called? Does the laitance always need to be removed? Sorry for the thick questions, I just need to have the answers when I speak to him.

 

[Alan Field]

I take it the tiles haven't been fixed yet ?

No not yet.

 

[White Room]

He hasn't started yet. What is the matting/barrier film called? Does the laitance always need to be removed? Sorry for the thick questions, I just need to have the answers when I speak to him.

Yes

 

[hmtiling]

He hasn't started yet. What is the matting/barrier film called? Does the laitance always need to be removed? Sorry for the thick questions, I just need to have the answers when I speak to him.

It's a decoupling membrane and whilst it's a very belt and braces approach to your job it's not imperative Imo. Also, it'll be another £2k ish on top.

 

[Alan Field]

It's a decoupling membrane and whilst it's a very belt and braces approach to your job it's not imperative Imo. Also, it'll be another £2k ish on top.

Even if the heating hasn't been on? Thank you for your replies

 

[hmtiling]

Even if the heating hasn't been on? Thank you for your replies

If the floor is dry

 

[Alan Field]

If the floor is dry

Brill. Thank you for you help. Much appreciated.