Dot and Dab Plasterboard onto painted walls

[acaciaguy]

Hello all,

I know it's not best practice to tile onto painted walls especially when using large format tiles. My question is this - if you Dot and Dab onto painted walls does this not create a similar issue of the paint being behind the plasterboard adhesive - is this why mechanical fixings are good to use aswell. In the past when faced with a painted wall I tend to go at it with a wirebrush attachment on a grinder.

 

[Waluigi]

Try to remove as much paint as possible, score it and attack it with a scutch hammer. Then thistle bond it and then dot and dab as normal.

Then, once set, plug and screw it using the XPS board metal washers.

 

[acaciaguy]

thank you How long does the thistle bond it take to dry such that it can then be d and d'd? would using battons instead of d and d be acceptable. I use battons when using backer board and space allows

 

[Waluigi]

You don’t have to use Thistle bond it- PVA would work too. Thistle bond takes a while to dry.

 

[Waluigi]

Battens would be fine too. Dot and dabbing is quicker and easier to get perfectly flat and Plumb in my experience.

 

[acaciaguy]

As ever many thanks

 

[widler]

Wasye of time and money scratching it, thisle bonding it, just dot and dab and screw through the dabs.
If you battened it you wouldnt do all the above, its the same process

 

[acaciaguy]

Many thanks widler. do you think that dot and dab is better than battened? Also do you have to use thistle bond it? It's £60 a tub. If it's the best and does the job then fair enough

 

[Dumbo]

Many thanks widler. do you think that dot and dab is better than battened? Also do you have to use thistle bond it? It's £60 a tub. If it's the best and does the job then fair enough

What he is say is you don't thistle bond your battens you mechanically fix . So why not just mechanically fix through the dots. Same process .

 

[acaciaguy]

What he is say is you don't thistle bond your battens you mechanically fix . So why not just mechanically fix through the dots. Same process .

Thank you for that. I misread. Makes sense!

 

[Waluigi]

I think it depends how well fixed you want it. Swings and roundabouts. I like to rely on the bond of the driwall adhesive as well as the screws.

Best practice would be to remove the backing coat of plaster completely and D&D to the brick/block wall IMO. That way the depth is less too

Thistle bond is probably overkill though

 

[WetSaw]

What he is say is you don't thistle bond your battens you mechanically fix . So why not just mechanically fix through the dots. Same process .

I think there's some confusion going on with Thistle Bond ( bonding coat plaster) and Thistle Bond-it ( primer) although I may be wrong...

 

[acaciaguy]

I think it depends how well fixed you want it. Swings and roundabouts. I like to rely on the bond of the driwall adhesive as well as the screws.

Best practice would be to remove the backing coat of plaster completely and D&D to the brick/block wall IMO. That way the depth is less too

Thistle bond is probably overkill though

Is this something that you ever do? Or is that only if the plaster is in a bad way

 

[acaciaguy]

I think there's some confusion going on with Thistle Bond ( bonding coat plaster) and Thistle Bond-it ( primer) although I may be wrong...

I understood us to be talking about bond it - the primer type coating that is painted on.

 

[WetSaw]

I understood us to be talking about bond it - the primer type coating that is painted on.

Just me then!

 

[Waluigi]

Is this something that you ever do? Or is that only if the plaster is in a bad way

Do it all the time. Usually hack off the old plaster though.

 

[widler]

Sorry, was first thing in morning, and my grasp on the queens english is bad enough
No need to thisle bond it , either screw battens if you have the space or dot and dab boards and screw through dabs, the bond it will be doing nothing imo

 

[acaciaguy]

Thank you widler

 

[WetSaw]

Those little hyphens make all the difference..