Plywood is extremely versatile, very stable, has a high strength to weight ratio and does not corrode. Plywood used for subflooring panels is at least 3/4 inch thick. For the kitchen, bathroom and toilet is suitable plywood brand FK. That usually means the underlayment and the subfloor also get wet. 2. What’s the thickness I should use, 15/32”, 19/32” or 23/32”? Install a layer of 5/8-in. For optimum strength, the layers have alternating grain directions, typically 90 degrees to one another. I HAVE BOUGHT A SECOND HAND WOODEN CONSERVATORY THAT AT PRESENT IS SITTING ON TWO LAYERS OF BRICKS - DO I NEED TO DO THE SAME OR CAN WE PUT IT ON TO THE FLOOR, How to lay vinyl floor in bathroom with floorboards. Chris, Manchester • Member since 17 Jul 2010 • No extra layers of underlayment are required. For joist spans 16 inches or less, NWFA recommends minimum panel thickness of 5⁄8-inch plywood or 23⁄32-inch OSB; the building code requires 5⁄8-inch plywood or OSB. The installation guide for 1/4 inch HardieBacker recommends having wood subfloors made of 5/8 inch exterior grade plywood or OSB (oriented strand board) that is 23/32 inches thick. One of the big considerations when installing different types of flooring in the home is getting the finished elevations to match. Burnley • Member since 4 Jun 2011 • feedback, Yes you need to ply the floor before tiling. No feedback, I would recommend getting correct advise from a qualified & experienced Tiler to answer any questions regarding tiling & tiling floor preperation, Broadstairs • Member since 28 Feb 2011 • Discussion in 'Carpenters' Talk' started by JustTheDab, Jun 26, 2016. I need your advice on the plywood subfloor first: 1. feedback, hi ..you can buy adhesive to tile straight on to floorboards ...but they have to be perfectly flat and the gaps not to wide ...i would recommend putting ply down ..at least 9mm and make sure you screw it down well ...make sure screws are not to long { dont want to pop any pipes } then use a primer and a good flexible adhesive ....good luck, Colne • Member since 6 Nov 2008 • 100% positive What is there now is a 3/4" OSB sub-floor … If the spacing is greater than 19.2 inches, the minimum plywood thickness is 7/8 inches, and that for OSB is 1 inch. Hope this helps before laying the new vinyl? Plywood. Leeds • Member since 20 Jan 2009 • If the joists are spaced 16 inches on centers or less, the minimum required thicknesses are 5/8 inches for plywood and 23/32 inches for OSB. Thanks for the info. drywall screws spaced every 4 in. I FEEL IF WE PUT IT ON THE FLOOR IT WILL ROT FROM THE WET - I THINK AT LEAST 1 LAYER OF BRICKS WILL LIFT IT AWAY FROM THE RAIN. Please make sure the screws are flush to the plywood or better still a bit in!. jobs, is any excess movement in it . HI I have over forty years as a tiler and M W Tiling is right,as some of the above advice is incorrect. Besides having an abiding interest in popular science, Deziel has been active in the building and home design trades since 1975. The level of humidity. CDX plywood (¾”) in particular is used often because it has a high level of resistance to moisture and humidity. Common Plywood Thickness. This subflooring comes in a vast range of thickness. should have this , we also pva the floor before Particleboard is suitable only for interlocking floating floors. What Size Plywood Do I Use for a Subfloor? 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