Tiling onto green chipboard - Tile Advice

[tommysbexley]

I am tiling a bathroom floor of 3.3 sq meters. There is currently 22mm green chipboard down which is very solid and covers 95% of the area then it meets some floorboards.

I am planning to over board using 6mm Hardie backer boards bedded into a small bed of S2 flexible powered adhesive then screwed down. Then go over it again with S2 adhesive to lay my 600mm x 600mm porcelain tiles.

As the chipboard is moisture resistant (green) do I need to prime the chipboard before putting the S2 adhesive down that I will bed the hardie backer board onto.

Many thanks

 

[Tony_C]

No need to prime, won't be going anywhere once it's screwed down. Adhesive is there
to help fill any voids. If your unsure just prime it anyway for all it but I wouldn't.

 

[tommysbexley]

Thanks Tony for your reply, once less job to do!