Overboarding - Need a quick answer please!

[actionjackson]

I'm in the process of overboarding with 12mm ply and have screwed down at 200mm centres around the perimeter.

What spacing do i use for the rest of the board?

Brew time me thinks :drool5:

cheers

 

[Gazzer]

200mm but ply is supposed to be min 15mm

 

[actionjackson]

Thanks - i have 10mm marmox going over the top so should be ok.

 

[diamondtiling]

Thanks - i have 10mm marmox going over the top so should be ok.

Key word there is should , marmox will give you a tiling surface, it wont add strength in the way 15 or better still 18 mm wbp would.

Good luck.

 

[YourTiler]

Ive always spaced at 6" intervals (ish) That's 150mm in new money :smilewinkgrin:

Now then....😱fftopic:slightly....Plywood - surely you don't install18mm ply ON TOP of existing floorboards?? I know this may have been raised before but as I'm a newbie I thought I'd bring it up. I usually use 12/15mm depending on quality of floorboards.

Back to topic ................

 

[diamondtiling]

Ive always spaced at 6" intervals (ish) That's 150mm in new money :smilewinkgrin:

Now then....😱fftopic:slightly....Plywood - surely you don't install18mm ply ON TOP of existing floorboards?? I know this may have been raised before but as I'm a newbie I thought I'd bring it up. I usually use 12/15mm depending on quality of floorboards.

Back to topic ................

Remove the existing chipboard or T&G and replace with 18mm WBP, add extra noggins for strength and overboard with 6mm NMP.

 

[mikethetile]

12mm ply is inadequate, needs to be a minimum of 15mm wbp

 

[david campbell]

i would remove floor boards and replace with 25mm ply and extra noggins
ditto 12mm ply is not sufficient,the ply is not only for a suitable tiling surface but takes into account the moisture and drying out times of the adhesive,so if the ply is too thin then the adhesive won't dry out to spec and you become liable-read the instructions on the adhesive bags-all but webber's anti-dust recommend 15mm or more

 

[actionjackson]

i would remove floor boards and replace with 25mm ply and extra noggins
ditto 12mm ply is not sufficient,the ply is not only for a suitable tiling surface but takes into account the moisture and drying out times of the adhesive,so if the ply is too thin then the adhesive won't dry out to spec and you become liable-read the instructions on the adhesive bags-all but webber's anti-dust recommend 15mm or more

The instructions on my adhesive (Weber rapid SPF) says that 9mm ply can be used on floors with no notable deflection. My floor was sound but for peace of mind I screwed the boards down so using 12mm Ply and 10mm marmox board on top should be adequate.

 

[kilty55]

hi action,15mm ply is advised or abover however i have yet to find anywhere that sells 15mm ply,18mm ply being thelatter option, so i would reccommend removing boards as diamond suggests and adding noggins and laying 18mm .

i dont reccomend to customersd the 12mm route however im sure you may well be safe enough if the sub floor was solid , in regards to 9mm being advised and also may i poit out a local large tile company sells 5.5mm ply to tilers botht these thicknesses of ply are not suitable

hope it works out okay for you