For residential use, one form of underlayment the Tile Council of North America’s handbook allows is plywood over joists that are 16 in. The go-to product is 1/2-in. Void-free underlayment grade panels, which both stiffen the existing floor and provide uniform support to prevent cracks in the tile above. Installation is a little counterintuitive though. Carpenters are used to installing all sorts of panels, from subfloor to wall sheathing to drywall so that the panel edges fall on joists, rafters, or studs. That’s exactly what you don’t want to do when installing underlayment. The panel edges should fall between the floor joists, and avoid fastening into them. The idea is to isolate the underlayment from movement in the framing below. November 19th All good comments. In residential use, the Tile Council of North America specifically allows ceramic tile to be installed directly over 1/2 in. Plywood underlayment in dry locations. Wet locations such as bathrooms require the addition of a waterproofing layer. There's a caveat though. The TCNA refs ANSI A108, and neither of those documents provide details for installation over joists on 24 in. Alternatively, the APA publishes details for subfloor installation it says meets the same design spec (Max L/360 deflection) for a variety of joist spacings and subfloors. And yes, the subfloor is best glued and nailed. None of this is to say that cement board or a plastic underlayment such as Schluter makes aren't also acceptable, but either of them would benefit from underlayment below, if you have the height. ANSI A108 calls for 1/8 in. Spacing between the panels, and 1/4 in. Between the panels and plumbing fixtures or walls. As to gluing the underlayment down, I'm on the fence. A108 calls for it, but doesn't spec what kind of glue or how much to use. The APA document doesn't require it. I would use 1/2' cementitious tile backer under the tile and install the hardood over existing subfloor with rosin paper or 15# felt membrane. Wondering how to install a subfloor over concrete? These important guidelines will get you started. (with urethane or construction adhesive) the second layer to first layer on 12' interior grid pattern (6' on the perimeter). Installation - Subfloor Over Concrete. Installation - Parquet Flooring. Installation - Engineered Wood Flooring. Remove all of the existing flooring in the bath, down to subfloor or slab. Mark the entrance to the shower and set a 3’4” -1”” tall wood level marker (rip one out of scrap 2X lumber). If you must install over such surfaces, it is best to install a backer board over the old surface and install the tile on the backer board. If installing over an appropriate wood surface, sand the wood to make it smoother, and remember that the installation will work better over a subfloor at least 1-1/8 inches thick. I like the idea of making construction reversible when possible. Glue the underlayment down, and you've hideously complicated any future remodeling of that floor. I compensate for not using glue by increasing the fastening schedule, and by using screws instead of the ring-shanked nails allowed by all the standards. Finally, I wouldn't hesitate to install a hardwood floor over underlayment installed in this way. But the Wood Flooring Manufacturer's Association does allow hardwood to be installed directly over OSB subfloor. November 15th Two things in this video make me cringe. First, using 1/2 inch plywood underlayment is inadequate by my standards. Typically I'm replacing a previous 'mud job' in a bathroom and sometimes in a kitchen, which means I'm making up for much more thickness. More critically, I want to add strength and stiffness to what is often an inadequate subfloor. I aim for 3/4 inch underlayment when possible and I'll settle for 5/8 inch if the transition to another room will be trouble. Sharp aquos board pen software download. Secondly, I would never tile directly over the plywood as this video seems to imply is acceptable. I'll either use 1/4 inch cement backerboard or a proprietary product like Schluter Ditra. In my experience tile applied directly to plywood will be a short lived installation and more likely to encourage rot in areas near a tub or shower. In fact, when doing demolition I cheer if the tile was applied directly to plywood because I know it will come up easily in a few minutes. Cement backerboard or a proprietary decoupling mat provides a better bond and a means to prevent future rot. November 9th Does the plywood and the installation practice shown comply with ANSI A108/A118/A136.1 American National Specifications for the Installation of Ceramic Tile that is referenced in the 2012 and 2015 IRC for installation of tile? I didn't realize until recently that the building code had a section that covering tile installation. Rather than having prescriptive measures spelled out the code just references the ANSI standard. I haven't wanted to spend the $40 to buy a copy of the standard so I'm not sure what's in it. Member Exclusives • We follow a framing crew to learn the fundamentals of installing roof sheathing • This Texas house borrows from the ground and the sky to achieve net-zero energy use and complete water independence. • We caught up with VELUX at the 2015 International Builders' Show to learn more about their line of roof windows. Roof windows have been popular in Europe for decades, but • We stopped by DRIcore's booth at the 2015 International Builders' Show to learn more about their Smartwall system for finishing basement. Their product is the all-in-one, quick-to-install wall panel. Subfloor Options Plywood is the best subfloor choice to lay on top of the pine because it nails in securely and creates a flat, even surface for the new floor to adhere to. When laying it over an existing floor, a thinner plywood panel is acceptable; it should be at least 1/4 inch thick. Particle board can be used, but it's not as strong as plywood and is extremely susceptible to moisture damage. If you're planning to lay tile instead of more wood on top of the pine, use a cement backerboard. It's normally installed with mortar rather than being nailed into place. Direction Because the pine floor joints will continue to shrink and expand with humidity changes after you lay the new subfloor, lay the subfloor perpendicular to the direction of the pine floor. For example, if the pine floor runs parallel to the longest wall in the room, lay your subfloor panels so that their longest side runs parallel to the shortest wall in the room, across the floorboard planks. Not only does this create a stronger base for your floor, it also allows you to lay new flooring in the same direction as the original floor. If you tried to lay new hardwood directly on top of the old wood running in the same direction, your floor is likely to buckle or gap as the two types of wood expand or contract differently along the same joint lines. Height Before you decide to lay subfloor and new flooring over your old flooring, measure the distance from the bottom of the doors to the floor. Adding subfloor and flooring could raise the floor height 1 inch or more, depending on the type of flooring you choose. Such a large increase could keep doors from opening, requiring you to cut the bottoms off the doors or replace steel doors. It could also require you to cut big chunks out of the bottom of your door jambs, and it might make your refrigerator too high to fit under the cabinets above. Take the height of the floor into consideration before installing the new subfloor.
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