I installed 20mm backerboard to the side wall to bring the space to 171cm (to allow 1cm margin for installation and tiling). Now I realised the bath is 1cm shorter. Can I glue another set of 1cm backerboards to the existing one to close the gap?
Is it sufficient to glue it or do I need mechanical fixings?
The 20mm boards are dotted and dabbed + mechanical fixings, which where a nightmare to fix to the hollow blocks behind
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