I am about to tackle my kitchen/diner floor. 30m2 in total finished with pocelain tiles in a modified hopscotch pattern.

I am also installing 10mm Marmox boards and cable underfloor heating, i have already learnt from reading the posts that it is advisable to use slc over the ufh and my questions are to do with that.

Can i pour the slc directly onto the finished Marmox boards or do i have to seal it before laying the ufh.

With such a big area it is going to cost a bomb to self level it. I am guessing it will need atleast 10 bags (any estimates from those that have done this before). Does any one know of a good self leveller for around £20 a bag or does it not exist. I see that a lot of people rate the mapei fibreplan, any ideas how much or where i can get it. I live near Grimsby/S****horpe so somewhere local would be good.

Thanks for your help in advance.

Dan

It is always a good idea to SLC over your cables for a number of reasons...
1. It protects your cables from trowel damage
2. It gives a much better surface to tile onto
3. Subsequent tile removal (cracked or chipped tiles for instance) has more chance of NOT damaging your cabling.

Fiberplan is excellent stuff and you can get it from Tile Giant if you have one near you. Apparenty Weber do and excellent equivalent too.

Thanks Grumpy. Just spoke to the local Tile Giant. They only have the Mapei Latex Plan and said they could do it for £24 a bag. Would this one do the the job.

Did you tell them the QTY you need? You might get it a little cheaper still if you say you need so many bags.

Marmox shouldn't need to be sealed in any way. The boards have a cement backing. You can get exactly the same boards as marmox a lot cheaper from places such as uheat.co.uk by the way.

Underfloor Heating | Electric | Floor Insulation | Uheat- c'mon dan leave the links........
can't add much to the above

Thanks for letting me know about the marmox. I realise it it expensive but i got a right deal off ebay. £3.50 / sheet, they were supposed to be damaged slightly but when they arrived you could not even tell. Each one had the odd little dent on the edge or something like that.

I did tell her i needed 10 bags off slc but that was the very best price. She did say £23.50 to start with but the computer would not accept a quote as low as that. £240 i can cope with if it makes the job easier and a better finish, it is if i need 15 bags or so it starts to get into big money.

Anyone done an area of this size with latex plan that could give me an accurate 'guess' on what i am likely to need. It does say 5m2/bag on it but i know from experince you cant trust what the bag says when it comes to coverage.

the s.l.c depend on the variations in your floor heights,if it's only slight then it could be less but if there is say 50mm discrpencies then obviously it will be more, have you tried the sika s.l.c from b@q it can be very cheap when on offer at about £15 a bag

Originally Posted by david campbell

the s.l.c depend on the variations in your floor heights,if it's only slight then it could be less but if there is say 50mm discrpencies then obviously it will be more, have you tried the sika s.l.c from b@q it can be very cheap when on offer at about £15 a bag

No not tried any slc before. I know the one you mean and have a trade card for b an q so that would be good. I am just going on advice of others in the forum that really rate the mapei stuff.

If i did run out is it a problem just doing as much as you can, then getting some more the next day and starting from where you left off.

Originally Posted by david campbell

the s.l.c depend on the variations in your floor heights,if it's only slight then it could be less but if there is say 50mm discrpencies then obviously it will be more, have you tried the sika s.l.c from b@q it can be very cheap when on offer at about £15 a bag

i use the sika from builder centre, costs me £9 a bag here's one which may be near you Building Supplies Hull | Build Center

Originally Posted by mikefiesta

i use the sika from builder centre, costs me £9 a bag

thats a brilliant price and found out theres 2 stores in glasgow and 1 in hamilton all close to me

heres a link if anyones interested-
Build Center Home | Build Center

Originally Posted by david campbell

thats a brilliant price and found out theres 2 stores in glasgow and 1 in hamilton all close to me

heres a link if anyones interested-
Build Center Home | Build Center

Hull isn't too far away from me worth travelling to at only £9 a bag. Will it do the job just as well as the latexplan. I am a big beleiver in the saying you get what you pay for.

sika is a major player in th econtinental market just not really broke into the u.k tiling market

one of b&q's positive notes

Originally Posted by Dancuprar

Hull isn't too far away from me worth travelling to at only £9 a bag. Will it do the job just as well as the latexplan. I am a big beleiver in the saying you get what you pay for.

it's a latex based slc and i've used it a few times and it seems good to me.

Hi Fella,
I use Granfix Solo flexible slc when going over ufh. I pay £11 bag at my trade price. Put a call in to granfix and ask about a local stockist. they based in derbyshire, cant remember the town mate and its too late to be wandering out my van in my pj's to read the bag!!!

Is it a must to use a spiked roller. And while I am on the case what size notched trowel would you recommend.

Thanks for all the advice so far. I have done quite a few Walls before but am new to floors.

webber slc is 10.95 + vat at ctd at the moment on special, its a good product and designed for heated floors , you just need to work it a bit more , but highly recommend it, i use plastic float so no damage to element

Dancuprar, What did you go for in the end?
I'm planning of leveling a big area myself and know what you mean about the cost!!
For info I've also seen the Siki SLC at £15 bag in B&Q but I phoned Sika's technical helpline today they advised me it wasnt suitable for encasing UFH - even though it says "Suitable for underfloor heating" on the bag.
Something about it wont stick to the heating element or somesuch and will crack.

Best I can find SLC near me (Liverpool) is around £23 a bag so would love to find a cheaper option.

i pay £16 for polymer modded ultra, up to 50mm

I use the Ultra 2 for ufh