Filler or tile adhesive to fix cracked off Hardie backer cement boards

[Joe Fixit]

Hi, all, got a couple of areas where Hardiebacker cracker off (my fault I know). But wondered if it's best to:

A) use their scrim tape, and fill it it deeper when I go to to do the joints with tile adhesive

B) find small bits of board and patch fix it with adhesive/filler

C) just use toupret filler

 

[robinbanks]

I think A; you're tiling them anyway, and it's the tiles and grout that provide the waterproof layer, not the backer boards. Them being cementitious just means that unlike plasterboard they don't go soggy, drop to bits and ruin your tiling if the grouting fails and water gets past unnoticed for a while

 

[RandomGrinch]

A) use their scrim tape, and fill it it deeper when I go to to do the joints with tile adhesive

As per the Hardiebacker instructions...

Use alkaline resistant scrim and fill the gaps with tile adhesive.

 

[Joe Fixit]

Thanks both. @RandomGrinch yes, I have HB's fibatape and will be doing option A. Thanks both