Can I use hardwall as a backing to tile onto. I've been told by many u can and u can't. Many thanks

[Alex111]

Can I use hardwall as a backing to tile onto. I've been told by many u can and u can't. Many thanks

 

[White Room]

No you can't, it's not suitable like many other gypsum undercoats.

 

[Alex111]

Thistle dri coat would be advised

 

[White Room]

Thistle dri coat would be advised

Yes mate but like everything depends on your tile weights.

 

[Alex111]

I need to check the weights. It has said on the BG site that dri coat will take 20kg/m2. I know the tiles are not as heavy as that.

 

[Old Mod]

Add 4/5kg for adhesive and grout too!

 

[Alex111]

Thank you very much for ur help.

 

[Dumbo]

British gypsum say no as it is one part of a two part system

 

[Alex111]

I'm assuming I can tile onto multi finish then ??

 

[Old Mod]

After it's fully dried and primed with acrylic primer, not pva!

 

[Alex111]

Spot on. Many thanks

 

[Alex111]

What's everyone's views on bedding shower trays on to ply wood with sand and cement.

 

[Flintstone]

A Terrible idea! But it happens a lot. A tray will not bond to sand and cement and, neither will ply wood really

 

[Alex111]

I have been told alway use silicon to bed them down on. It's flexible and bonds to the tray and plywood. BUT......... Manufactures state sand and cement. Don't want to upset the warranty. But surely it's better to use silicon

 

[Flintstone]

I don't fit shower trays but if I did I would use an s2 tile adhesive.

 

[Alex111]

I have a little issue ATM with one I'm fitting at the mo. .900wide 1800long. I bedded it on flex tile adhesive. Not 3 days later the tray is moving.

 

[Dumbo]

If it has failed on Tile adhesive it would of failed on cement . We have had failures on Silicon random crack in tray . We stick lots of trays with flexi Tile adhesive much like tiling you have to make sure you have good coverage

 

[Flintstone]

I once had to re fit a tray that the plumber had stuck down with plasterboard adhesive

 

[Alex111]

There is very minimal movement in the ply wood. So I can't see it being this But maybe it is. It's very frustrating.

 

[Dumbo]

If its moving I would think that would be your problem

 

[Flintstone]

The bottom of the trays aren't usually a great surface to stick to hence using an s2 like ultimate that stick to all sorts of surfaces

 

[Alex111]

It hasn't stuck at all. I lifted the tray up no prob. I don't think u can ever make a ply wood floor non moveable.

 

[White Room]

British gypsum say no as it is one part of a two part system

BG change the goal posts to suit by the sound of it.

 

[Dumbo]

BG change the goal posts to suit by the sound of it.

I remember my chat with bg there was one under coat they would recommend but not hardwall . When I was trying to get an answer why it wasn't suitable and not just take because I said so I got accused of being aggressive.

 

[SJPurdy]

I remember my chat with bg there was one under coat they would recommend but not hardwall . When I was trying to get an answer why it wasn't suitable and not just take because I said so I got accused of being aggressive.

Which undercoat do they recommend?

 

[Dumbo]

Which undercoat do they recommend?

That I can't remember you will have to call bg

 

[Deane]

Light tile only is ok....seal it first..

 

[Deane]

What's everyone's views on bedding shower trays on to ply wood with sand and cement.

Bad bad idea...

 

[Bathfix Bob]

The sand and cement isnt meant to glue the tray down its just to bed it down, if you come in the next day and start yanking corners up it will move.
Think about the Mira flight leg kit...are the legs glued down?

 

[Dumbo]

Bad bad idea...

If you make a screed mix that is meant for 75mm plus so thin bedding under shower tray there should not really enough thickness for it to be strong enough . Have removed a few trays which were s+c bedded came away really easy. We always bed flexible tile adhesive , much better product to use at those thicknesses .

 

[Dumbo]

The sand and cement isnt meant to glue the tray down its just to bed it down, if you come in the next day and start yanking corners up it will move.
Think about the Mira flight leg kit...are the legs glued down?

Funny thing going slightly of topic . I know a plumber who had a cracked tray . Bedded without sufficient coverage so told by manufacturer his fault . This tray is also designed to sit on legs so far fewer points of contact compared to bedding on muck so how does that equate .