Hi all

I'm using Topps Trade Rapid-Set Flexible adhesive to secure 6mm Hardy cement boards onto floorboards, do I need to prime the floorboards with anything?

Many thanks

Forgot to add that I am also screwing them down......

you dont need to prime floorboards as the adh under cementsheet is only to fill voides so cementsheet is flat and sound screws hold it in place recomend you stagger c/s

Thanks for the quick reply, what type of screws do u recommend as the Hardy ones are to long @ 28mm. I got some external use screws from B&Q....!

best bet to go with the recomended ones or ones nearly identical external grade is better check around there are shorter ones

I would be using a 2 part superflex adhesive and 25mm stainless steel screws

Originally Posted by mmmadman

Thanks for the quick reply, what type of screws do u recommend as the Hardy ones are to long @ 28mm. I got some external use screws from B&Q....!

How thick are your floorboards?

I like to overlay t&g with ply 9mm in small, deflection free areas screwed at 6" centres, then glue and screw Hardie 6mm (or the like) cement board over this. I know it might not be exactly to the book, but I also know it works. I am now ready to receive the back lash. ( I always use Mapei Keraquick with latex plus) never had a problem I would like to hear anyones comments on this method.

In theory Phil, it is to spec .. 15mm over board but with double layer adhesive.. so OTT for some..

Originally Posted by Phil Hobson

I like to overlay t&g with ply 9mm in small, deflection free areas screwed at 6" centres, then glue and screw Hardie 6mm (or the like) cement board over this. I know it might not be exactly to the book, but I also know it works. I am now ready to receive the back lash. ( I always use Mapei Keraquick with latex plus) never had a problem I would like to hear anyones comments on this method.

do you mean the old style floorboards Phil, as opposed to t&g chipboard flooring?

Originally Posted by doug boardley

do you mean the old style floorboards Phil, as opposed to t&g chipboard flooring?

Doug, I use this method on small areas only, 9mm wpb ply screwed at 6" centres, then Hardie board 6mm glued and screwed using Keraquick with latex plus. Then tiles fixed with Keraquick with latex plus, on T&G floorboards or chipboard (providing no deflection)

Originally Posted by doug boardley

How thick are your floorboards?

They are 18mm T&G traditional floor boards, the area is less than 3sqm and I have screwed all the bords down in addition to the original nails.

Originally Posted by mmmadman

They are 18mm T&G traditional floor boards, the area is less than 3sqm and I have screwed all the bords down in addition to the original nails.

I see your reluctance to use 28mm screws then, they'd have been fine if you had 22mm T & G

hello,i cant seem to post is anyone having issues?

or pm anyone?

Nice method Phil. Bombproof mate!

Kilty - Having some problems posting too. Just intermittant.

Martin