Prep underneath Hardibacker...?

[JoelyP]

Hi All,

I am tiling a wooden floor in my bathroom (joist span 40mm, board thickness 16mm - small 2m squared area). I am putting down 6mm Hardibacker boards in preparation for waterproof matting and tiles with bal rapidset flexible.

My local topps tiles told me to simply screw the board down to the floorboards with the special screws but the manufacturers instructions say to 'Apply a supporting bed of mortar or modified thinset to subfloor using a 1/4" square-notched trowel.' What is the general concensus on this mortar bed? Can i just use the bal rapidset flexible adhesive (not sure if this is classed as a mortar or modified thinset) or would i need to use something different?

Thanks in advance, any advice welcomed,

Joel.

 

[tictic]

screw boards down(no deflection)...prime boards with a sbr follow mfr inst..for mix ratio.

set/cut boards"staggered" postions.

then use a flexiable floor adhesive,onto boards spread with a 6mm serator,"thinset"..
then set boards out(brick affect)..
screw down.
fix tiles with flexxy addy,
leave to set, 3hrs if rapidset or 16hrs with single part flex.
then grout...wash..polish....


jobs a good one...