Hardie backer screws

[Rudy45]

will these stainless screws be ok for hardie backer?

https://www.screwfix.com/p/ultra-sc...k-multipurpose-screws-4-x-40mm-200-pack/79985

Do you need to drill pilot holes?

 

[GoneGuy]

I use gold screws

 

[Andy Allen]

As above, turbo gold screws, no need to pilot drill, even without an impact driver.

 

[Spare Tool]

40mm is way to long, 25mm is sufficient for 6mm Hardi...or you may very well need an emergency plumber.

 

[Rudy45]

Is 4x40 ok to secure 12mm hardie to studs. I’m not sure

I would say 25mm is even too long for 6mm to the floor, there’s no need to come out beneath chipboard,

I have 16mm screws for floor, it will be put down with adhesive as well

 

[Dumbo]

25 mm fine for floor with 22mm t and g chipboard and 6mm Hardie . Personally I would use 4.5 by 50 for the walls

 

[Waluigi]

16mm screws for the floor?! will barely even bite.

 

[On one]

16mm screws for the floor?! will barely even bite.

My feeling would be that the head size on a 16mm screw is just going to pull through the Hardiebacker

 

[Bopster]

25mm turbo gold for 6mm hardie on floors is perfect. No risk of hitting unseen pipework and plenty of bite
35-40mm turbogold on stud walls

 

[Waluigi]

These bad boys if going into your Geberit wall frame.
Straight in, no drilling.

 

[Colo]

The heads snap off stainless screws as they are not as strong as steel. Follow the advice from the lads on here and use turbo gold. I have never had one snap.