R
Realstokebloke
Hi, newbie, first big job, you know the drill...
I have extended a small, x3 sided sq. shower into a rectangular tray, so have taken out & replaced one (stud) walls & replaced the backing completely.
The facing / back wall needed to be ripped out to halfway on the line of a noggin (approx mtr high) & replaced below that.
So the top of that wall & the whole of the other side wall is the 'old' plasterboard with the old adhesive ridges in / on it. It does have a new panel of plaster board over a new mixing valve now seated behind tho'.
This is me to the plumber. Ref the 'new' backing board, which is just straight plasterboard:
"Will that be OK ? Don't i need that Aquapanel or similar?
"No, be fine".
Ref the 'old' plasterboard with the ridges:
"Will that be OK to tile over? & do i need to get rid of the ridges (it looks like old tub adhesive used on what were smaller tiles).
"No, be fine, just have a thick bed."
"Do i need to seal it with PVA or similar?"
"No be fine, straight on."
Now, by chance & 'cos i don't want to get it wrong as the new tiles, shower & screen all cost a bomb, i thought i'd check out that 'advice'.
So B4 anyone shouts "no PVA", i now understand that, thnx.
And for info, the adhesive i have used for the floor is Unibond Rapid set ultraflex (which is their best one they tell me) & was going to use this again on the walls.
I also understand that if i keep the 'new' plasterboard, i can seal it with an acrylic primer (like BAL'sAPD is it?)
I am also using 330 x 330 tiles, so know / think i need a cement based adhesive for the size & hence know / think i need an acrylic so it doesn't break down the plasterboard.
I then delved deeper and see you can tank it. As i understand it, this primes with an acrylic (APD-type) then uses a mesh to seal the base & sides & then has a thick gunky stuff over to waterproof it?
So (& if this is correct so far), my options ref the new stuff are to:
remove it & replace with Aquapanel or similar? (not ideal, as it's all "in" & snug & square & straight & will cost to replace)
to simply acrylic prime the new stuff and press on.
to tank it to be sure?
My options ref the 'old' stuff:
replace (aquapanel)
or will an acrylic seal-in the old adhesive to stop a reaction with the new? (or do i have to get it all off first - & if so, how? - so that it's flat al well (there are some small ridges in it nothing major & as the plumberman said, it will even out with a decent bed.)
Or will tanking over that seal it all it & "belt & braces" it as it were?
To me, it sounds like a tank kit - any particular one? The BAL looks OK but has only 5M of tape - the Mappei one OK?
I'm also boxing in a waste pipe run but can only fit in really thin ply (WPB). Would i be as well to use a gun adhesive to stick these as the mix adhesive above?
I hope i've averted a car-crash (if i did as 'advised') and be very grateful for your thoughts guys, cheers and sorry, it ended up like a play script at the top !
Advice too on telling the plumber gently, he's no tiler (he's a decent guy & an OK plumber so far).
I have extended a small, x3 sided sq. shower into a rectangular tray, so have taken out & replaced one (stud) walls & replaced the backing completely.
The facing / back wall needed to be ripped out to halfway on the line of a noggin (approx mtr high) & replaced below that.
So the top of that wall & the whole of the other side wall is the 'old' plasterboard with the old adhesive ridges in / on it. It does have a new panel of plaster board over a new mixing valve now seated behind tho'.
This is me to the plumber. Ref the 'new' backing board, which is just straight plasterboard:
"Will that be OK ? Don't i need that Aquapanel or similar?
"No, be fine".
Ref the 'old' plasterboard with the ridges:
"Will that be OK to tile over? & do i need to get rid of the ridges (it looks like old tub adhesive used on what were smaller tiles).
"No, be fine, just have a thick bed."
"Do i need to seal it with PVA or similar?"
"No be fine, straight on."
Now, by chance & 'cos i don't want to get it wrong as the new tiles, shower & screen all cost a bomb, i thought i'd check out that 'advice'.
So B4 anyone shouts "no PVA", i now understand that, thnx.
And for info, the adhesive i have used for the floor is Unibond Rapid set ultraflex (which is their best one they tell me) & was going to use this again on the walls.
I also understand that if i keep the 'new' plasterboard, i can seal it with an acrylic primer (like BAL'sAPD is it?)
I am also using 330 x 330 tiles, so know / think i need a cement based adhesive for the size & hence know / think i need an acrylic so it doesn't break down the plasterboard.
I then delved deeper and see you can tank it. As i understand it, this primes with an acrylic (APD-type) then uses a mesh to seal the base & sides & then has a thick gunky stuff over to waterproof it?
So (& if this is correct so far), my options ref the new stuff are to:
remove it & replace with Aquapanel or similar? (not ideal, as it's all "in" & snug & square & straight & will cost to replace)
to simply acrylic prime the new stuff and press on.
to tank it to be sure?
My options ref the 'old' stuff:
replace (aquapanel)
or will an acrylic seal-in the old adhesive to stop a reaction with the new? (or do i have to get it all off first - & if so, how? - so that it's flat al well (there are some small ridges in it nothing major & as the plumberman said, it will even out with a decent bed.)
Or will tanking over that seal it all it & "belt & braces" it as it were?
To me, it sounds like a tank kit - any particular one? The BAL looks OK but has only 5M of tape - the Mappei one OK?
I'm also boxing in a waste pipe run but can only fit in really thin ply (WPB). Would i be as well to use a gun adhesive to stick these as the mix adhesive above?
I hope i've averted a car-crash (if i did as 'advised') and be very grateful for your thoughts guys, cheers and sorry, it ended up like a play script at the top !
Advice too on telling the plumber gently, he's no tiler (he's a decent guy & an OK plumber so far).