Hardiebacker or marmox

[kaharrison9]

Evening.

Any thoughts on which is the most rigid surface to overboard with.

6mm hardie screwed and on adhesive or 6 or 10mm marmox screwed and on adhesive

Cheers.

Kevin

 

[thompsonbrown]

Not a big fan of Hardie and can't think of a reason to choose it over Marmox.
(probably get shot for saying that on here)
Hardys a bit more rigid and can take a bit more weight, So if I ever have to fit tiles that weigh over 62kg I might consider it.
Might have to underpinn the house for that job:lol:

 

[SJPurdy]

if over-boarding timber floor then I think that it must be 10mm insulation board (not 6mm) so floor height raised more. The 6mm insulation board can be used to provide some insulation over concrete floors where the thicker/better insulating 10mm board can't be fitted due to height restrictions

 

[One Day]

How big is the floor? I doubt either would do much to overcome excessive deflection which would be best sorted by strengthening the structure or overboarding with 15/18mm wbp in line with BS5385.

If it's just to provide a suitable tile surface though - i'd go with marmox (although I use Wedi) everytime.
Hardi is too messy, heavy, full of silica

 

[RealEarth]

much better product than either of those mentioned above is the Dukkaboard XL. 6mm cement board giving the equivalent strength (or thereabouts) of tiling onto 18mm ply. Feedback has been great from the tilers who've used it so far.