Some Advice For Tiling Kitchen

[Tile Shop]

The SLC is to go over the electric heating cables, not the screed (unless its really wonky). It a) protects the cables while tiling, b) encases the cables to get full heat transfer, c) gives you a perfectly flat surface to tile onto and d) easier to lift the tiles if you fudge up or have to replace any in the future........ This will differ if you use a system like Ditra Heat as they recommend tiling it directly without SLC providing you hit 100% coverage. But double check with the heating manufacturer for their recommendations.

If its a new screed it should be pretty level to begin with. Any minor imperfections can be overcome with adhesive when laying the insulation boards (as an example, Tilemaster Rapid Setaflex can overcome 12mm) , but again ensuring you have a 100% solid bed and no voids. If your floor is out by more than what it says on your bag about maximum depth, then yes you will need to level it first, before laying your insulation. Or you could consider switching to a PTB adhesive.

 

[Swindiff]

OK so thinking as I will be getting a new screed laid, an in screed system will probably work out a lot cheaper. I have about 75-80mm to play with. So 25mm of Celotex laid on the concrete subfloor. Heating cable attached to the Celotex. I have found this kit online which seems reasonable.
In-screed Underfloor Heating System
Screed with a 50mm thick fibre screed. Tile directly onto the screed. Would this be a legitimate method?
Does the Celotex need fixing in any way to the concrete subfloor?

 

[J Sid]

water fed in screed heating not electric

 

[Swindiff]

I have ruled water fed out, the electric will be much easier and cheaper to install.

 

[J Sid]

but not to run

 

[Swindiff]

I know it would be cheaper to run, but for my situation just to much of a pita to install

 

[Old Mod]

Look into this Schluter system, it radically reduces height of required screed, it's a wet system as opposed to electric. So although initially more expensive, far more economical running costs.
Sounds ideal for your situation.

Underfloor Heating System | Schlüter-Systems

 

[Swindiff]

That does look interesting, cheers. I have emailed them to find out prices, am dreading what they will come up with lol

 

[Swindiff]

Electric it is then lol. Over 4 grand for that system. About 10 times the price of in screed electric heating. No way I could justify spending that sort of money on it. Cheers anyway.

 

[Swindiff]

So all the flooring is now up. I can manage to get in 50mm of insulation and 60mm of screed. Just wanted to check my plans with guys in the know that may have done this before. Floor is block and beam construction rather than a poured concrete base, see image.

20160610_160600.jpg

Lay a DPM over the block and beam concrete floor, leave plenty up the walls
http://www.screwfix.com/p/dmp-damp-proof-membrane-blue-1200ga-4-x-15m/98181

Lay Celotex 50mm insulation. Which should I use? The most common seems to be Ga4000, but I have also read that Celotex tuff-R GA3000 is suited to underfloor heating (fibres to give extra strength) is this necessary?

Tape all the joints in the Celotex, should I use the proper celotex tape, or are you just paying for the name, will general aluminium tape do?
http://www.screwfix.com/p/aluminium-foil-tape-silver-aluminium-50mm-x-45m/35529?kpid=35529&cm_mmc=Google-_-Product Listing Ads-_-Sales Tracking-_-sales tracking url&cm_mmc=Google-_-Shopping - Sealants and Adhesives (New)-_-Shopping - Sealants and Adhesives-_-all\sealants & adhesives\building tape\other_0b0f1183-7209-23c9-8a5c-00002313f16a&gclid=CjwKEAjwkPS6BRD2ioKR7K245jASJAD1ZqHOwglYCwBthe_QmnNWDnuyPa-DmMD9uiwBIE3sBtEq0xoCblTw_wcB

Should I have another sheet of plastic here. I have read a 500ga seperation later on top of the insulation is a good idea?

Install the in screed heating system. I have come across a few (3 links here), which is best, or are they all much the same?
In Screed Underfloor Heating | Underfloor Heating
Warmup Inscreed Heating
In Screed Underfloor heating Cable Kits

Install expansion foam around the walls to allow the screed to expand when heated
http://www.screwfix.com/p/jg-speedfit-jgufhedge-edge-insulation-roll-25-x-0-15m/87019?kpid=KINASEKPID&cm_mmc=GoogleLocal-_-Datafeed-_-Heating and Plumbing&cm_mmc=Google-_-Shopping - Heating and Plumbing-_-Shopping - Heating and Plumbing-_-all\heating & plumbing\underfloor heating\jg speedfit_0b0f1183-7209-23c9-8a5c-00002313f16a&gclid=CjwKEAjwkPS6BRD2ioKR7K245jASJAD1ZqHOpfLRoCrQPy8A9imbo_FBMaDvSlz_--hDk3nuQ1euJRoCyw_w_wcB

Screed over up to a level of 60mm. I will be installing a fiber screed for added strength for expansion and contraction of the heated floor.

Am I missing anything, any tips?

Cheers

 

[Swindiff]

Don't know why my photo links are not working. Tried one from google drive and facebook

Edit: Posted as a link rather than an image seems to work

 

[Swindiff]

Also considering something like this, really depends on what the guy who is changing my boiler says. Wondering if the pump will fit in same cupboard as the boiler and if it will how quiet it is.

ProWarm™ Standard Output Water Underfloor Heating Kit - Standard Output Kits - Water Underfloor Heating

Polypipe standard output single zone kit

 

[Swindiff]

This is what I have come up with for the Polypipe system. Any obvious errors?

Kitchen Area (Screed and UFH Radius).jpg

 

[Swindiff]

Should I post this in a different forum, its more underfloor heating at the minute rather than tiling?