Bathroom walls and floor and Granfix

[zzr-matt]

Its been a few years since I was last on here but I'm back as I have another bathroom to do 🙂 This time I'm using 300 x 600 porcelain tiles. The local tile place is a Granfix stockist. They used to be Mapei so previously I used Primer G, Keraflex Maxi and Keraquick with latex additive. Whats Granfix like compared to Mapei?

This one has a selection of issues:
1. The walls are 75mm light weight blocks with a 10mm render with a 3mm skim on top. Unfortunately the skim is not stuck to the render and just comes away. The render (not sure if thats the correct name) is hard but feels a bit dusty to the touch. Much like if someone had just blown a load of building dust over it. Once I have scraped all the skim off I assume I can prime this and tile straight on?

2. I need to build a small section of stud wall in a shower enclosure. I was going for aquapanel onto the studs, tape the joints then tank the area before tiling. Does that sound ok?

3. The flooring is a mixture of P4 / P5 chipboard on joists at 450 centres. I was going to go over this with 12mm ply screwed to the joists and chipboard below but from what I have now read on here no more ply 6mm may be the way to go? Does this need to be glued and screwed?

Can anyone recommend the best Granfix adhesive to use for the above?

 

[zzr-matt]

30m2 give or take.

 

[bugs183]

Where are you based???

 

[zzr-matt]

North Hampshire

 

[White Room]

You may have a couple of choices, one is to hack off the whole lot and dot and dab plasterboard to the walls...or perhaps mechanically/screw battons to the wall so you can screw plasterboard to the battons.

There are other methods but that means going into the realms of metal systems.

 

[zzr-matt]

Here's a massive picture of a cross section of the wall. You can see where the skim has blown off the face of the backing. Its hard to scratch the surface of the backing with a screwdriver. Does it look like render or browning?

 

[White Room]

Looks like render to me Matt.....

 

[zzr-matt]

So if I scrape off the blown skim and then prime with Primer G or similar then I should be good to tile?

Any advice on item 2 / 3 in my original post?

 

[White Room]

I would try and get as much of the skim off, if you have a wallpaper steamer use that and keep it on the plaster for a while and will loosen it off and prime.

 

[White Room]

Its been a few years since I was last on here but I'm back as I have another bathroom to do 🙂 This time I'm using 300 x 600 porcelain tiles. The local tile place is a Granfix stockist. They used to be Mapei so previously I used Primer G, Keraflex Maxi and Keraquick with latex additive. Whats Granfix like compared to Mapei?

This one has a selection of issues:
1. The walls are 75mm light weight blocks with a 10mm render with a 3mm skim on top. Unfortunately the skim is not stuck to the render and just comes away. The render (not sure if thats the correct name) is hard but feels a bit dusty to the touch. Much like if someone had just blown a load of building dust over it. Once I have scraped all the skim off I assume I can prime this and tile straight on?

2. I need to build a small section of stud wall in a shower enclosure. I was going for aquapanel onto the studs, tape the joints then tank the area before tiling. Does that sound ok?

Thats fine

3. The flooring is a mixture of P4 / P5 chipboard on joists at 450 centres. I was going to go over this with 12mm ply screwed to the joists and chipboard below but from what I have now read on here no more ply 6mm may be the way to go? Does this need to be glued and screwed?

Is the chipboard 22mm thick and you have no bounce on the floor

Can anyone recommend the best Granfix adhesive to use for the above?

The addy would be a single part flexible.

 

[zzr-matt]

Thanks whitebeam. Chipboard is only 18mm and is a right patchwork! Is 12mm ply a better bet?