Quote:
Originally Posted by Paul Linley  Hi there.. you would be ok to use Bal Fast Flex staight on to your floorboards or alternatively you could use Hardi backer board 6mm, using a thin bed of adhesive between the backer board and floor board and screwing them down at 200mm/8" intervals. I hope this helps |
6mm hardiebacker does not add strength to the floor. It is only viable if the floor is solid in the first place and this is stated in the Hardie literature.
There is much written in the forums regarding this subject and it is worth doing a search through the forums to read and analyse te views.
My own view is that if the floor is solid it is fine to use the likes of Fasflex or Ardex-flex 7001. If the floor is not solid, then it should be overboarded in accordance with British Standards, i.e minimum 15mm wbp ply.
It has been stated in these forums that No More Ply correctly laid with the
correct adhesive adds sufficient strength to a floor but as yet we have seen no technical data to back this up.