My 1st Job Hardiebacker confusion - TilersForums.com

[Dan Fitchie]

Hi, my first post and as the title suggests my first attempt at renovating a bathroom.
I bought some hardiebacker 500 for boarding around the shower area with the intention of using the fixing to masonry instructions given by hardiebacker ie high strength gap fill adhesive and screws into the wall. However after stripping off the old blown plaster and render down to brick have found the brick work to be very uneven, and maybe I'm thinking about it wrong but I can't figure how I'm going to get the boards level before mechanical fixing using just a small amount of gunned adhesive. Does anyone have any ideas?
Thanks

 

[Bond]

You could strap the wall with pre-treated timber battens,e.g. 25 x 50mm. And fix board to that.

or glue -on packing pieces to straighten wall, prior to boarding.

 

[Blunt Tool]

You would be better to prime/stabilise brickwork and get some powder bagged flexible tile adhesive mixed and dot dab boards on plumb and level marking where you have put dabs on outer face of boards so when dry drill screw and mechanical fix thru boards and dabs securing onto brickwork.

 

[Dan Fitchie]

Thanks for the suggestion bond. It's a tight room and the battens would bring the tiles past the door frame on one of the walls. Forgive my ignorance but what do you mean by glue on packing pieces?

 

[Bond]

Thanks for the suggestion bond. It's a tight room and the battens would bring the tiles past the door frame on one of the walls. Forgive my ignorance but what do you mean by glue on packing pieces?

 

[Dan Fitchie]

You would be better to prime/stabilise brickwork and get some powder bagged flexible tile adhesive mixed and dot dab boards on plumb and level marking where you have put dabs on outer face of boards so when dry drill screw and mechanical fix thru boards and dabs securing onto brickwork.

I didn't think you could dot dab hardiebacker? It says not to on their faq or are they referring to solely using dot dab. Is it OK with the additional mechanical fix?

 

[Bond]

Would go with callatiler suggestion.
Packing pieces, of various thickness spaced to straighten wall, then glue and fix through these.

 

[Dumbo]

Take the hardi backer back . Get some wedi / Marmox or jackoboard then dot and Dab and mechinacally fix when dry

 

[Blunt Tool]

Flexi tile adhesive dabs and mechanical fixed boards will be fine but you could have used tile insulation boards ie Wedi, marmox, Kerdi which are lighter easier to cut and more suited for walls. If you can get refund and swap over that’s what I would do. Same installation method only difference is you need a purpose made washer per screw that supplier of boards should have in stock.

 

[One Day]

A shame that you've got hard. It's so readily mis-sold. If you can return it, then do so and get 20mm wedi/marmox/jacko boards instead. These can be easily fixed to uneven brick using dabs of tile adhesive.
If you're stuck with hardi though, I'd fix it with dabs, but you'll need to also use mechanical fixings such as frame fixings.
Please also remember hardi isn't waterproof in a wet area. You'll need to tank it.