UK Moisture in floor advice...please Page: 2

[sparkymarky78]

Yep, he said to use self levelling over the marmox multiboards and then paint a 2 part epoxy resin dpm.
He will tile over that he said.

 

[Tile Marble Granite]

Yep, he said to use self levelling over the marmox multiboards and then paint a 2 part epoxy resin dpm.
He will tile over that he said.

That is bad practice.

I noticed you have a shower enclosure there; did you check for any leakage? Those suspended shower trays tend to leak.

 

[sparkymarky78]

That is bad practice.

I noticed you have a shower enclosure there; did you check for any leakage? Those suspended shower trays t

Oh is it?

No I checked for leaks underneath the tray. All seems dry.

All rooms concrete floor read similar 75+ RH with the hygrometer, give or take a couple of percent so pretty sure its due to moisture/vapour coming up from ground but the carpeted rooms deal with it obviously the vinyl would let the moisture out into the room though

 

[sparkymarky78]

That is bad practice.

I noticed you have a shower enclosure there; did you check for any leakage? Those suspended shower trays tend to leak.

So you would, sbr the backer boards and then ditra mat? Would you use flexible tile adhesive to apply the mat or something else? Thankyou

 

[Tile Marble Granite]

That's right!
Flexible tile adhesive is fine

 

[sparkymarky78]

Ok thankyou. Do the channels in the underside of the ditra mat direct allow moisture to flow along their length? If so does that moisture end up going to the walls?

 

[Tile Marble Granite]

The backer boards are 100% moisture proof. That floor is ready to be tiled.

Uncoupling membrane speaking: if there are 2 sheets of Ditra on the floor, you may apply a polyethylene tape on the joint. If you are worried about any moisture getting to the walls, then you can apply tape to the walls as well.

Schluter KERDI KEBA Sealing Tape - Tiling Supplies Direct

Schluter KERDI KEBA Sealing Tape is a sealing band used to seal matting and board connections/joints and wall to floor connections.

www.tilingsuppliesdirect.co.uk

 

[sparkymarky78]

The backer boards are 100% moisture proof. That floor is ready to be tiled.

Uncoupling membrane speaking: if there are 2 sheets of Ditra on the floor, you may apply a polyethylene tape on the joint. If you are worried about any moisture getting to the walls, then you can apply tape to the walls as well.

Schluter KERDI KEBA Sealing Tape - Tiling Supplies Direct

Schluter KERDI KEBA Sealing Tape is a sealing band used to seal matting and board connections/joints and wall to floor connections.

www.tilingsuppliesdirect.co.uk

Thankyou.

That's what I don't get, marmox boards are water proof yet the floor hygrometer on top of them reads 80% RH today at 20 degrees....and the Relative humidity in the floor will be even higher in winter when the floor is colder.

Tempted to spend a day, cover the shower glass and walls with protective coverings and sds up the boards and tile adhesive and start again, lay a 1200g polythene dpm on the bare slab, self level and put down new marmox boards or ditra, but as I can't get under the shower done 100% with the dpm sheet thats likely pointless/fruitless I guess

 

[sparkymarky78]

So figure your option of the ditra mat is worth a shot ontop of the boards.

Oh and just noticed there are dips in the boards/not level. Ffs

 

[Tile Marble Granite]

Is it suspended floor or concrete?