Need help please to stop the arguing

[Jonathan Campbell]

I'm about to tile a bathroom floor, with porcelain tiles 600x300 mm. It's on the first floor where the flooring is 22mm chipboard. I'm aware the building standards say 15mm plywood....so what are my options as the boy I work with says 6mm ply overboarding will be fine with a flexible adhesive and grout?? Also what size of spacers would you recommend on the floor?

 

[WetSaw]

As long as there's no deflection in the floor overboard with 6mm cement board.
Normally 3mm on floors but depends what your tiles are like for size.

 

[Andy Allen]

Is it a floating floor...??

 

[WetSaw]

Is it a floating floor...??

On the first floor?

 

[Andy Allen]

For some reason I thought it was a flat or something....... I'll shut up then...🙁

 

[Waluigi]

Ply still hasn’t filtered down to everyone that it shouldn’t be used anymore.

6mm ply was never OK to use to be fair. We used to use 12mm and 9mm at a push. Part of the reason that a lot of adhesive manufacturers recommended 15mm ply was (IMHO) because it wasn’t as widely available as the likes of 9mm and 12mm ply.

Nowadays it’s a tile backer board. Glued, screwed and taped and filled.

The older ply that we used to use had a thicker top veneer and was held together with a specific glue bond. Nowadays the market has been flooded with poor quality ‘general purpose ply’ which isn’t up to spec.

In fact some ply wood is still used in the flooring industry, notably for LVT flooring whereby there are only two types available that meet the criteria set out in the British standard- SP101 and FG1 ply wood. Generally these only come in 6 and 9mm.

 

[Just Rizzle]

sp 101 is a really brilliant ply twice the cost of any other, i use it by the ton for my lvt work and in several smaller bathrooms were i can put down 1 sheet have tiled on it using a flexi adhesive ie ultimate by tile master

 

[Glynn]

Fixing to 6mm SP 101 or Class 3 Flooring Grade Ply are the only ply-wood that we would recommend tiling to. Though British Standards have recently said not to, how can a product that as been recommended for donkeys years and worked, suddenly become un-tileable. So long has the substrate is strong, stable and inflexible, 6mm, GOOD quality ply-wood fixed at 150 centres is allowed with certain adhesives.