Concrete floor-ufh-porcelain tiles

[dziqs]

Hi
In my bathroom I have a concrete floor, on the top of it is coming ufh (uniprom/unipipe) and porcelain tiles. Question is what should be used betwen ufh and porcelain tiles?? only flexible adhesive or maybe some leveling compound and than adhesive?

[whitebeam]

How thick are the pipes on top of the screed floor

[dziqs]

I think around 10mm. why? for what do you need it?

[whitebeam]

Not one I've come across on top of the screed, 10mm,s quite a thickness

[dziqs]

? what do you mean

[nybor62]

surely it should be laid on top of insulation boards first then screed over

[Dontiler]

I would sugest to use UFH electic 1 if it's only in the bathroom, you floor will come really high if you fit uniprom pipes

[jay]

www.unipipe.ie/ -

this the one as mentioned above it needs to be bedded in a screed

[andy8758]

Hi dziqs.

I see you intend to lay underfloor water heating pipes on top of concrete? I think that such pipes should normally be laid as part of a new screed floor, with a floating insulation layer, then pipes and screed covering the pipes. Then tile on top.

If you are not replacing the floor electric ufh is the best solution, it still needs to be laid on an insulation layer (usually 6mm boards e.g. Marmox boards) then best course is to cover the cables with self levelling compound, then tiles on top.

Have you had anyone with prior experience of ufh come and assess your needs? I strongly recommend that you do so before you part with any cash and definitely before anything is laid and set in concrete or adhesive!

[dziqs]

the thing is that I have that ufh in whole flat (1 bed) in the hallway and lounge is intalled laminate flooring but in bathrooms will go porcelain tiles.Builder who didn't finish the job fixed a thin plywood on the top of ufh but it doesn't make a sense does it?

[jay]

www.unipipe.ie/ - Cached - Similar might pay to read the specs

[whitebeam]

Thin ply on ufh don't sound right, how thick was the ply

[dziqs]

I think 9mm

[jay]

so they put the heating down then ply over the top is that all

[whitebeam]

What area do you live

[dziqs]

I live in london

Yes that's all what I have in the bathroom but I think will have to remove the ply and scred it,then tile it, right?

[jay]

hows the ply fastened

[whitebeam]

You will be bringing the floor up so high, could you not get electric ufh

[dziqs]

ply is in some places screwed but in some loose

[jay]

ply is in some places screwed but in some loose

does floor spring and sag when walked on in areas were floating floor used

[dziqs]

does floor spring and sag when walked on in areas were floating floor used

yes, it's loose

[whitebeam]

This is'nt going to work with that amount of bounce with the tiles laid, they will crack with that movement

[whitebeam]

What area of London is that mate

[jay]

from the sounds of what you have told us you might have a problem which you are not aware of

[jay]

the ufh needs to be screeded to protect pipes then floor coverings applied over (after the correct drying time and commissioning of floor heating )

the way you have described it there is every chance that the pipes will get damaged from constant abrasion from ply causing the pipes to rupture and leak causing a lot of damage
i recommend you ask for someone to have a look at what has been done as i think you are sitting on a time bomb
prob not the answer you were looking for but its a concern hope this helps

jay

[whitebeam]

Were here to help, as jay says

[Dave]

Have you got any pics..?

Are the pipes laid in channels..?

[jay]

http://www.unipipe.ie/technical-down..._catalogue.pdf

like in the last part of this file

[dziqs]

http://www.unipipe.ie/technical-down..._catalogue.pdf

like in the last part of this file

Jay my pipes are going in a metal plates (like on the picture from part 6- Suspended wood floor) but underneth I have concrete floor, no joist. Do you think that ply can be screwed to the concrete through that metal plate? Will metal plate protect those pipes? And how thick should ply be?

[jay]

Jay my pipes are going in a metal plates (like on the picture from part 6- Suspended wood floor) but underneth I have concrete floor, no joist. Do you think that ply can be screwed to the concrete through that metal plate? Will metal plate protect those pipes? And how thick should ply be?

how do you support the metal plates as there designed for timber
yes pipes are protected
i recomend screeding pipes in then theres no chance of any movement
and the manufacture does to if you could fasten with no movement at all no bounce then you would need to go up to a min of 18mm ply but i think screeding would be cheaper hope this helps