Hi All, A bit of advice please.I have used UFH on wooden substrates many times including my own bathrooms.
I have been approached to do a floor approx 20m2 which at present has wooden floor boards on wooden joists.
The client would like UFH installed, and wants the belt & braces treatment for the floor.
So here's what i intend to do
1 - Remove floor boards
2 - Strenghten joists with dwangs
3 - Screw down 18mm WPB prime both sides and edges with Mapei primer G
4 - Stick down Wedi board 6mm with Mapei keraquick, then screw down @ 200mm centres with washers
5 - Tape joints with wedi joint reinforcement tape & fill then smooth over with keraquick
6 - install heat mat making sure all cables are sufficiently bonded to wedi board, if necessary using spray adhesive
7 - apply a coat of Mapei fibreplan SLC cant remember if wedi board requires priming prior to SLC???
8 - Fit decoupling mat ????? is this necessary ???? the client is willing to pay if it is???? if necessary do i use a flexible adhesive ????
9 - Fix the floor tiles. Again what is the correct adhesive to use ie flexible ???or non flexible ???
10 - Grout with flexible grout
So guys/girls have i left anything out can you answer the ???questions??? for me
Thanks in advance

What tiles are they.?

definitely flexible adhesive throughout

Originally Posted by Dave

What tiles are they.?

Hi Dave they are 200x200mm ceramic

IMO no need to uncouple as well..

Originally Posted by The hammer

Hi Dave they are 200x200mm ceramic

probs no need for de-coupler then.

Originally Posted by Dave

IMO no need to uncouple as well..

snap!!

Thanks Dave & Doug for your prompt replies do you know if you need to prime the wedi board prior to using the Mapei Fibreplan SLC ???

no need to prime, just make sure it's dust free

Originally Posted by doug boardley

no need to prime, just make sure it's dust free

Cheers Doug all my queries answered now thanks very much

Originally Posted by The hammer

Hi Dave they are 200x200mm ceramic

ceramics on the floor over ufh? they could damage easy and then risk damaging the cable whilst removing them. if the customer doesn't mind paying, advise him to buy porcelain.

Originally Posted by Mike

ceramics on the floor over ufh? they could damage easy and then risk damaging the cable whilst removing them. if the customer doesn't mind paying, advise him to buy porcelain.

Cheers Mike, the customer has ordered these from Miami, they have a geometric kind of pattern on them, i have only seen them on a website i'm assuming they are ceramic, they may well be porcelain but i dont think they'll be changing them.
Thanks anyway

UPDATE !

Just spoke to Mapei technical department they specified -:

No primer G required at any stage of the installation

Use latex plus with keraquick for sticking Wedi board & Tiles

Cheers