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?

 

[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?

 

[White Room]

If your going to use ply 18mm would be my choice, British Standards recommend a minimum of 15mm....you could even rip up the old chipboard stick a few extra noggins in and use 22mm ply.

 

[zzr-matt]

Understood. Should I be tanking the shower area? 1 wall will be aquapanel, and 2 walls the render mentioned above. I was going to tape and cover all joints with single part flexi adhesive.

 

[White Room]

The aqua panel is not waterproof just water resistant, if your going to tank the shower area use 12.5mm plasterboard and tank that...should save you a few bob.

 

[zzr-matt]

Right my 18mm WBP ply and MR plaster board have been delivered. What should I be priming the edges and underside of my ply with?

 

[White Room]

Sbr would be my choice....

 

[zzr-matt]

Hi chaps, one of the rendered walls is savagely out of plumb. The top of the wall is around 30mm further in to the room than the bottom. I was going to plasterboard this with the board making contact at the top of the wall, and then varying thickness's of horizontal battens at 450mm spacing going down the wall. Is that the easiest way given that I probably cant dot and dab as there is nothing for the adhesive to bond to?

 

[BARRONBATHROOMS]

Why not dot and dab strips of plasterboard to the wall let the addy go off then dot and dab the plasterboard onto the strips. You can plug and screw as well if you wish. Be easier to keep the wall flat and plumb

 

[White Room]

As above, done that a few times....

 

[zzr-matt]

My 1 day a week glacial progress continutes.

All the skim is removed and the wonky wall has been d and d and mech fixed. Ive then applied a mapei tanking kit in the shower area so finally its time to buy the tiles and addy.

The tiles are from the tile depot and are 300 x 600 mm voranda porcelain.

Id like to buy adhesive and tiles from the same place so it seems to leave me either own brand ronnie or a granfix adhesive. Any recommendations on either of them?

Do i have to prime the tanked area before tiling or only the non tanked?

Cheers for all the help so far.

 

[macten]

Just prime the non tanked area