Chipboard floor

[rj1884]

Hi. Thanks for your replies. The tiles are large format porcelain tiles. When you guys fix hardie to chipboard do you screw just into the chipboard or through to the joist due to the chipboard potentially breaking up due to movement or would put ditra to take the stress of the expansion and shrinkage in a new build.

 

[Mr Tiler]

I cant comment on the use of ditra but I don't 'think' it is necessary in this case. but with the screws you just want them to go into the chipboard no need to go through

 

[Stef]

As Bri says there are pre marked holes on the Hardie fix through those into the chipboard.
Use 25mm turbo gold screws & it will be sound.
I always use a flexi addy to stick down Hardie,
I know Hardie state a non flexi can be used but I have ripped Hardie back up & believe me the addy sticks the boards really really well.

 

[beanz]

According to shluter, you can Ditra straight onto a deflection free chipboard floor.. What's everyone'sthoughts on this? I've not tried it, so am just curious... 😉

 

[Andy Tiler]

According to shluter, you can Ditra straight onto a deflection free chipboard floor.. What's everyone'sthoughts on this? I've not tried it, so am just curious... 😉

You can do that but I would stick it with Ardex af 200 rather than a cement based adhesive

 

[beanz]

What's the reason for that Andy?

 

[Andy Tiler]

What's the reason for that Andy?

Sticks better!! More elastic.Evan Schluter recommend it?

 

[beanz]

Sticks better!! More elastic.Evan Schluter recommend it?

ok mate, cheers for that 😉

 

[thompsonbrown]

Good afternoon

went to look at a job this morning. 4 upstairs bathrooms including a loft extension bathroom and all of the floors are the wonderful 22mm moisture resistant chipboard straight onto the joists. All the floors are solid so no deflection issues. It's been explained that it needs overboarding which he understands. My question is, is if I use hardie backer or an insulation board like marmox glued and screwed am I right in thinking that it's really only the screws holding the board down as the adhesive doesn't adhere to the chipboard or am I way off the mark.
Also what would you guys recommend using in this situation.

Thanks in advance

The Glue or adhesive (dependent on board manufacture) is the main sorce of contact for the board. The screws will help but are also there to hold the board in place while the glue/adhesive set.
Prime the floor first as this will adhere to chipboard, then your glue/adhesive will adhere to your primer.
Hope this makes sence as i'm having a few beers repling to this, while the missis is out.:lol:

 

[Andy Tiler]

The Glue or adhesive (dependent on board manufacture) is the main sorce of contact for the board. The screws will help but are also there to hold the board in place while the glue/adhesive set.
Prime the floor first as this will adhere to chipboard, then your glue/adhesive will adhere to your primer.
Hope this makes sence as i'm having a few beers repling to this, while the missis is out.:lol:

A lot of adhesive company's don't recommend priming timber now!so always check with the adhesive manufacturer beforehand