Quick one on Hardibacker

[Bobbymoore66]

Hopefully a quick one. I’m laying 6mm hardibacker direct on floorboards, without wanting to screw through a waterpipe does anyone know roughly how thick floorboards will be ( I am not in a position to lift them between now and when the job starts). I’m hoping I can buy 16mm turbo screws and they will do the job. I’m spreading BAL pourable 1 as the adhesive to fill any voids.

Thanks.

 

[J Sid]

6mm hardie ?

 

[Qwerty]

Most floorboards are 22-25mm. If its the old non tongue and groove get a paperclip, straighten it out and then bend the last 5mm at a right angle. Slide it between the boards and twist until you feel the underside. Voila! You can work out the depth

 

[Time's Ran Out]

Play safe on 18mm boards.

 

[GoneGuy]

I usually use 20mm -25mm screws dependent on thickness of floor boards.

16mm seems to small as 6mm board and adhesive there might not be enough screw to bite into floorbords

 

[Flintstone]

25mm screws every time

 

[Bobbymoore66]

6mm hardie ?

I have to meet existing bathroom tiling so have to lay 6mm otherwise I’ll be too high.

 

[Bopster]

25mm turbo gold any day and everyday

 

[Boggs]

6mm Hardie glued and screwed with 25mm screws every time.
16mm won’t be long enough.

 

[Waluigi]

Some houses I’ve worked in have 15mm T&G. Average I work In is 18mm for T&G.

Usually it’s only above 18mm in the older floorboards.

25’s are the standard size screw used.

I’ve never worked in a house where I was unable to check the floorboard depth. There is always a way. Straight to the airing cupboard. Often loose boards there and always lots of pipes in holes.