Dot and dab to brickwork

[rj1884]

Good afternoon.
Just started a bathroom which has resulted in the plaster/sand and cement falling away from the brickwork on the external wall in the walk in shower area as we removed the existing tiles. We've striped the wall back to the brickwork as the wall was so bad. We intend to dot and dab using a backerboard. My question is is there a specific adhesive I should be using to stick the boards or would any cement based adhesive do. Also would you guys mechanically fix the boards as well for extra security.
Thanks in advance

 

[CJ]

Not ideal hardi backer. You can dot/dab marmox and then screw when dot have dried.

 

[rj1884]

Sorry should have mentioned. We're using dukka board as oppose hardie. Would thickness would you use.

 

[diamondtiling]

You using hardi? if so driwall adhesive plus mechanical fittings, seal up the joins and internals and away you go. Knauf aqua panels say on the label not to fix using dot and dab system (used to anyway)

Here is one I did..

 

[rj1884]

Very nice mate. I've spoken to dukka board technical and they've mentioned you can dot and dab there boards but they're to be mechanically fixed as well.

 

[CJ]

They recommend 20mm if wall is rough.

[DLMURL]http://www.dukkaboard.com/pdf/Dukkaboard_06_solid_walls.pdf[/DLMURL]

 

[diamondtiling]

Used Dukka board a lot in commercial shower areas because its so quick to install, 100mm boards to use on the floor create instant falls to full length drains. 20mm on the walls as CJ says using the screws and washers that come with the boards.

 

[rj1884]

Thank you for your quick responses.

 

[rj1884]

What thickness would you use on a stud wall.

 

[diamondtiling]

I cant remember all the sizes but its incredibly strong material, 20 mm sounds right but if they do 12/15 mm these should be fine with plenty of timber behind them to eliminate bounce.

 

[CJ]

Min 12mm.

 

[IHB]

Fixing instructions etc in their [DLMURL="http://www.dukkaboard.com/Catalogue.php"]Dukkaboard[/DLMURL]

 

[thompsonbrown]

Used Dukka board a lot in commercial shower areas because its so quick to install, 100mm boards to use on the floor create instant falls to full length drains. 20mm on the walls as CJ says using the screws and washers that come with the boards.

Is that tile safe membrane on the walls? When I did my impey training we were taught to do it that way. Then the company sent out a letters asking us not to.

 

[diamondtiling]

Is that tile safe membrane on the walls? When I did my impey training we were taught to do it that way. Then the company sent out a letters asking us not to.

How else could you do it? It is a great product (expensive) but it did the job. When I fitted it I had reservations because after 3 hours I could still peel it back, the next day though it was stuck and was not coming off at all.
What were the reasons not to fit it this way?

 

[rj1884]

What would you recommend for priming the brick work.