Hardibacker - no fixings, adhesive only?

[FreeD]

Went into a well known tile shop yesterday to buy hardibaackers 6mm for my job monday...I will be overlaying t&g chipboard with 6mm hardibacker, the member of staff told me that when overlaying t&g chipboard there is no need to use screws at 200 centres just a 2 part flexi adhesive?? I can't find any info on the hardibacker site to support his claims, but seems odd to me as boards may have voids underneath which over time could delaminate if not mechanically fixed also?

[Matt]

I spoke to Knauf about this the other week (About Aquapanel obviously ). The strange thing was they couldn't really give me an answer as to why you need to screw and use adhesive, but they said you MUST.

[pjc]

I dont know anything about hardibacker but the PCI board i use you dont have to use fixings on the floor but wouldent use 6mm at least 10mm I use on floors :Pete

[Dave]

The screws fasten the board down and the adhesive fills voids...So you 100% need to screw it down...on timber floors.

[FreeD]

chipboard is secured with screws...small area...using 6mm not to add strength but for a better surface to tile to and protect chipboard from contact with water.

[FreeD]

Thing is on a perfectly level floor with perfectly flat boards it would probably be ok to fix with adhesive only...but how often do we find that?!

[Dave]

You need to screw it down..the advice from the shop is wrong.....

[Dave]

Here is a step by step installation guide.....


Hardibacker250 installation.

[jay]

hi deffo screw it down as dave said adh is only to true voides screws are your anchor