Durabase WP

[osmyth]

I've got this for my tiler to use on a wetroom.
I have emailed Dural about this question but not had a reply yet.

Which primer/adhesive would you recommend (is required) to use with it.

Is there any limitation on the weight of the wall tiles that can be used with it.

thanks, Owen.

 

[Gazzer]

What substrate are you fixing the Dural WP too?
What tiles are you using?
The limitation is usually defined by the substrate.

 

[osmyth]

It is skimmed plasterboard 12.5mm I think on blockwork. Tiles are 12mm travertine.
Thanks, Owen.

 

[Gazzer]

You will find that those tiles will be over the weight limit for skimmed plasterboard.

 

[osmyth]

Is there info somewhere on the weight limits for each substrate?
Thanks, Owen.

 

[Gazzer]

Is there info somewhere on the weight limits for each substrate?
Thanks, Owen.

http://www.tilersforums.com/tiling-forum/13313-all-questions-i-asked-when-i.html

http://www.tiles.org.uk/help/answer-weight.shtml

 

[osmyth]

Thanks very much.

Would putting the durabase wp inbetween have a significant affect on the limits.

Which adhesive/primer would you recommend, assuming the correct tile weight?

 

[doug boardley]

putting the durabase on will not affect the weight issues, the substrate cannot safely bear the weight of trav. If you change your tiles to ceramic they should be ok. A single part flexible (bagged) adhesive should be used. Make sure you prime the plaster with an acrylic primer too.

 

[osmyth]

Thanks.

Got through to Dural and they suggested that Durabase WP is only really designed to be used on the walls, with CI being used on the floor for waterproofing and decoupling.
They said that if the floor had no bounce then WP could be used.

Has anyone used WP on the floor?
Did you use flexible adhesive or a vinyl adhesive (Dural suggested this is possible)?

Just deliberating whether to buy some CI for the floor or use the WP I already have. It's a new floor of 22mm chip which will have 4/6mm ply over.

Thanks very much.

 

[diamondtiling]

6 mm ply on your floor is not sufficient as a tiling surface, 18mm is best. Your floor should be deflection free.

 

[osmyth]

Even if the 6mm ply is on top of 22mm t&g chip which is glued and screwed?
The floor is pretty solid as it is already, without the ply on yet. Oversized joists spanning 2.6m.

 

[grumpygrouter]

Even if the 6mm ply is on top of 22mm t&g chip which is glued and screwed?
The floor is pretty solid as it is already, without the ply on yet. Oversized joists spanning 2.6m.

6mm ply is not a suitable surface to tile onto, irrespective of the board size underneath. It is affected too much by the moisture in the adhesive and becomes unstable. Much better to use 6mm cement based backer board if your floor is solid. If the floor has bounce, it needs to be strengthened by overboarding with 18mm ply as a minimum.

 

[osmyth]

Thanks, I've just got the same answer after popping in to the tile shop (where i'm getting the tiles from, well their second shop anyway).
Fella seemed to know what he was talking about and recommended a 6mm cement board, which negates the need for the membrane (in the dry area at least). (The ply hasn't been put down yet, just the 22mm chip).

The tiles are 22kg per sq.m. and I was thinking of the durabase wp on the walls in the wet area, which would mean 2 lots of adhesive. The fella thought there would be no problem with the weight issue.

Do you think that weight is ok for skimmed plasterboard.

I suppose the other option would be to rip out the plasterboard and put cement boards up.

 

[osmyth]

...and is putting a backer board down on 22mm chip using adhesive ok, as the chip will be just as susceptible to water ingress as the ply, if not more. Is it because it's the depth of 22mm that makes it ok?
Should the chip be acrylic primed same as ply would be?

Thanks again.

 

[doug boardley]

Thanks, I've just got the same answer after popping in to the tile shop (where i'm getting the tiles from, well their second shop anyway).
Fella seemed to know what he was talking about and recommended a 6mm cement board, which negates the need for the membrane (in the dry area at least). (The ply hasn't been put down yet, just the 22mm chip).

The tiles are 22kg per sq.m. and I was thinking of the durabase wp on the walls in the wet area, which would mean 2 lots of adhesive. The fella thought there would be no problem with the weight issue.

Do you think that weight is ok for skimmed plasterboard.

I suppose the other option would be to rip out the plasterboard and put cement boards up.

and then factor in adhesive and grout at 4kg per m2, pushing it way over safe limits. However unskimmed plasterboard would bear this weight and the WP membrane safely.