backer boards

**aran** · 15-05-2008

evening all......does anyone know how many 6mm backer boards id need for a 23sq mtr room??never used them before,do you just lay onto spf or do they need screwing as well?the floors chipboard at the mo.what kind of price would i be looking for these at topps with a trade card?cheers for your help

**CLAYS TILES** · 15-05-2008

Originally Posted by aran

evening all......does anyone know how many 6mm backer boards id need for a 23sq mtr room??never used them before,do you just lay onto spf or do they need screwing as well?the floors chipboard at the mo.what kind of price would i be looking for these at topps with a trade card?cheers for your help

backer boards are 1sq metre each, you need to screw down to ensure a perfect balance (no movement!) every 300mm. £11.99 @ trade price! go for the thicker boards for floors thou!

**Dave** · 15-05-2008

The 6mm hardie boards from CTD are 1.35 sq'mtrs per board.....1500mm x 900mm

**aran** · 15-05-2008

cheers lads

**quick draw macgraw** · 15-05-2008

Hello Arun,

Just layed my first backers and you can get fitting techniques from the internet, it states that they have silica in them which is hazardous to health so use mask when cutting with knife. It also states that they are easy to cut and recommends using carbide tipped blade which i didn't have so used my normal blade and it took more than one score to get them to snap (quite a few actually). They sell screws specifically for backer with ribbed countersunks so they drive into boards but as i was laying 6mm onto 20mm floorboards and the crews were 30mm i had to draw line onto backer where the water pipes were running and use these screws where the pipes weren't and smaller zinc screws over pipes.
Using my wall trowel to lay i used up more addy than i thought but this was obviously down to floorboard height irregularities.
Still have little bit to go tomorrow but ones i have layed haven't cracked so far ( fingers crossed )

ATB Steve.

**aran** · 15-05-2008

so you lay with a wall trowel?i'll look into getting one of thoes blades then...dont think ive got the job now anyway..see my topic 'am i over charging'....