Underfloor heating on chipboards

[Andy Allen]

have you checked to make sure its not a floating floor?

 

[shogun rua]

Hi Andy,

How do i check that mate?

Cheers

Paul

 

[Andy Allen]

a floating floor is just chip board over insulation with no fixings, try lifting some of the flooring and look for fixings where its screwed to joists, if there are none then theres a good chance its a floater in which case i wouldn't touch it with a barge pole.

 

[shogun rua]

great tip Andy cheers, so dont tile on floating floors then to move movement

 

[Andy Allen]

imo there to unstable, with to much deflection.

 

[shogun rua]

what do you think of the list did i miss anything?

 

[Rich]

Your list seems good as long as you follow each stage to the installation instructions all the way through the project. It is vital to get a solid bed of adhesive under the cement boards and the tiles, you shouldnt ever "dot and dab" anything apart from plasterboard on walls (that I can think of). This shouldnt be hard with your floor, trowel the adhesive on the floor and press the boards down into it firmly and give them a bit of a twist making sure that the corners and edges are well and truly bedded down into the adhesive, then the screws do a good job of pulling the boards down into the adhesive bed.

 

[shogun rua]

thanks 12mm trowel

 

[Rich]

Not for the cement boards, I use a 6mm on most floors. Only use a bigger trowel if I dont get a good coverage with that. A half moon trowel for laying the tiles and you will want to back butter the back of the tiles with the flat edge of the trowel before laying them into the adhesive bed as well, this should give you a better chance of getting 100% coverage

 

[shogun rua]

do you always back butter your floor tiles aswell as lying addy on the floor?