Tiling on floor boards & shower tray sealant

[iaincameron]

Jammy,

I was going to use Bal SPF, but following advice here I have ended up with Mapei Keraflex Maxi. I have floorboards, 12mm ply, wired underfloor heating which will have SLC over it (3-4mm) and then Keraflex Maxi and tiles.

The main reason for using the Mapei stuff was cost. Less than £14 (inc VAT) for a 20kg bag (white) from CTD in Warrington as opposed to £32 + VAT for Bal.

Cheers
Iain

 

[kingk]

alrite jimmy
trustilng kev

 

[Jammy]

Jammy,

I was going to use Bal SPF, but following advice here I have ended up with Mapei Keraflex Maxi. I have floorboards, 12mm ply, wired underfloor heating which will have SLC over it (3-4mm) and then Keraflex Maxi and tiles.

The main reason for using the Mapei stuff was cost. Less than £14 (inc VAT) for a 20kg bag (white) from CTD in Warrington as opposed to £32 + VAT for Bal.

Cheers
Iain

Iain thanks for your reply,

So you went for 12mm ply on top of floorboards but no thermal board on top of the PLY. Are you happy with the performance of the UHF i.e. does it warm-up quick enough ?. Were your floorboards in good condition or did they "bounce" which is why you went for ply.

I must admit I'm still not sure what I will do in my case, I was looking at WBP ply tonight in B&Q various thickness available 6, 9, 12, & 18mm. 6 looked a bit flimsy wereas 18 looked way too thick for my small room.

With regard to the adhesive looks like there are good deals available on the Mapei products, I went for Bal as it was available from the shop were I got the tiles from (don't know if they also do Mapei) and I didn't check all the advice from this forum first. However I got a really good deal on the tiles, the price tag on the tile display was £43 per m (and I needed 31 square meters walls and floor) but after some negotion they reduced them to £19 per m :hurray:. The Bal SPF though cost me £35.56 for 12.5Kg excl VAT 😳.

 

[iaincameron]

I've not got the floor down, so can't comment yet! The floorboards were fairly good (70's house), but I screwed down any bouncing ones first before the ply. The shower tray was also mounted on the ply and I didn't want that straight on floorboards so I had to overboard. We have UFH in the kitchen which was straight on concrete (not by me!) and it does seem to use quite a lot of power!

As far as ply goes Wickes is a LOT cheaper than B&Q and also does bigger sheets. If I was you I would take that Bal back to the shop at that price. You will need 2 or 3 bags I would guess, especially if covering UFH without using a SLC. No doubt one of the proper tilers, rather than a DIYer, can advise how much adhesive you will need.

 

[Jammy]

Iain
Thanks for the advice, I'll take a look and consider SLC.