For best results, you'd then apply 1/4 inch lauan underlayment plywood over the repaired subfloor to make it perfectly level. 4 x $40 = $160. Plywood continuous over two or more spans and face grain perpendicular to supports.Unsupported edges shall be tongue-and-groove or blocked except where nominal 1 / 4-inch-thick wood panel-type underlayment, fiber-cement underlayment or 3 / 4-inch wood finish floor is used.Fiber-cement underlayment shall comply with ASTM C1288 or ISO 8336 Category C. Allowable uniform live load at … Flooring underlayment comes in a variety of different forms, ranging from 1/4-inch plywood to cement board to carpet padding or foam material. Your new layer of underlayment needs to be perpendicular to the joists just like the subfloor is. Re: 1/2" plywood subfloor Nearly every house I framed in the 70s and early 80s was 1/2" subfloor with 5/8 particle board over in the carpet areas and 5/8" ULCX ply at the vinyl areas. Step 1: Get the plywood to the right level of the house. A plywood subfloor generally uses 1/2-inch to 3/4-inch-thick sheets of plywood that have one rough side (which faces down) and one smooth side, which faces up. It typically comes in 4 x 8-foot sheets. Resultant finished height (5/8" + 1/4") does not equate the same strength as a solid piece of material at the stated thickness. The thickness that builders use most often for subfloors is 3/4 inch… Direction As a sub-floor, I prefer to install the plywood sideways as the finish flooring will be installed lengthwise on top of that. The span rating for 1/2 inch plywood is 32/16. This will be necessary if you're going to lay down resilient (vinyl) flooring. The fasteners should not protrude out of the bottom side of the subfloor. For optimal and long-lasting results, consider all three components when installing a new floor. For hardwood, tongue-and-groove CDX plywood rated AC with a 1/2- to 3/4-inch thickness is ideal; ceramic or porcelain tile does best with 3/4-inch AC plywood; and stone should use 19/32-inch tongue-and-groove plywood. Plywood comes in 4-by-8-foot sheets with thicknesses ranging from 1/4 to 1 1/4 inches. However, on one of my very first houses using plywood, we had a giant downpour during construction when the frame was open. Do I need to remedy my subfloor before I put down carpet? I have 1/2 CDX plywood subfloor. The half inch (actually 15/32 inch) thick plywood that I use, adds another 73.5 lbs to the conversion. I am about to lay 1/2" APA Underlayment rated plywood down as an underlayment over 3/4" plywood subfloor for 1/2 strand woven bamboo. Discussion Starter • #1 • Apr 25, 2012. 9. Installed 16 sheets (very pricey) of 3/4" sanded plywood directly over the 1/2" subfloor. BTW, 1/2 + 1/4" does NOT equal 3/4", strength wise. Make sure you predrill the hole through the 1/4 inch plywood, use a bit the same diameter as the outside thread of the screw. Be careful! For screws, a 1 lbs pack of 3 inches long #8 coated screws will cost around $10, I’ll use these for the framing. The floor system is not dependant upon receiving any strength from the hardwood floor to meet this requirement. The panels should be staggered every 2 feet and spaced 1/8 inch between ends. It is fastened to the subfloor and sits below the finished floor, providing a suitable base that is as smooth and flat as possible. Filled a 20 yard dumspter. Answer. 1/4" plywood does not add structural integrity to a floor application and does not have the nail holding capacity. 1-1/8 x 4 x 8 Sturd-I-Floor Tongue & Groove OSB Subfloor (Actual Size 1.069" x 47-1/2" x 95-7/8") Model Number: 1242922 Menards ® SKU: 1242922 It was 1-1/8-inch plywood we should have glued to framing but just nailed it. The sheets are generally 4 x 8 or 4 x 12 feet in size. Is the extra 1/4 inch really needed? Used 3 boxes of 1 5/8" Deckmate screws. That’s 32” when plywood is sheathing for a roof (not much expected weight on it), and 16 inches as a floor (lots of expected weight on it). This provided a nice stiff floor and eliminated my squeak issues. Exposure 1 : Plywood suitable for uses not permanently exposed to the weather. Leave a 1/4-inch expansion gap around walls and joints. Table 3 applies to sanded grades such as A-D and B-D. Panels classified as Exposure 1 are intended to resist the effects of moisture on structural performance as may occur due to construction delays, or other conditions of similar severity. If additional force is needed, always use a block of wood against the groove edge to minimize damage to the panel, and always allow a 1/8-inch gap between panels. For touch-sanded grades such as C-D Plugged, C-C Plugged, UNDERLAYMENT and APA RATED STURD-I-FLOOR (marked PS 1), see Table 2. Foolishly, the tile guys wanted to mud base over just the 1/2" so the tile wasn't so much higher tha the hallway and bedroom carpets. • Nail-down subfloor: 5/8 -inch or thicker plywood panels are fastened every 12 … 10 Posts . 16 inch on-center joist spacing with single layer OSB or plywood subfloor; 19.2 inch on-center joist spacing with single layer OSB or plywood subfloors; 24 inch on-center joist spacing with double layer OSB or plywood subfloors; 24 inch on-center joist spacing with single layer OSB or plywood subfloors; Each configuration has specific guidance for: Plywood, or even OSB, has its strength running with its length. The two layers together made up the subfloor. For many years, the standard option was lauan plywood, also called Philippine mahogany or luan plywood, which is made with an inexpensive tropical hardwood, and therein lies its problem. The system is designed for use on all of the most commonly used subfloor materials—plywood, OSB, concrete and gypsum-based screed. Removed this floor down to the joists and replaced the 1/2" plywood :bonk: . See our complete plywood underlayment installation video at www.InstallSurePly.com. Plywood is the most common type of subflooring. Additionally as mentioned, drywall screws are not rated for flooring application. I have 3/4 inch thick plywood screwed to joists already and I am going to add secondary 1/2'' plywood underlayment on top of it for more stiffness because I am going to tile marble floors. • Glue-down subfloor: 5/8 -inch plywood panels are glued in a staggered joint pattern directly to the slab. These panels feature a built-in underlayment that allows the convenience of using only Sturd-I-Floor® under certain finish flooring, especially carpet and pad. Step 3: Secure your plywood pieces in place using 1-inch decking screws. If you are using 1/4 inch plywood, and you are going through 3/4 inch subfloor, I would go with a 1-1/2 to 2 inch screw. Most plywood underlayment is about 1/4 inch thick and has square edges and a smooth, knot-free top face. We’re comfortable slightly exceeding the recommended subfloor spacing. When your house was built the subfloor system was 1/2" ply with 5/8" (probably) over it. Place your plywood pieces so their joints don’t go directly over the joints of your wood subfloor. Do not 1/4 turn the underlayment direction from the subfloor. I could just have well been parquet. I am thinking #8 length 1-1/4 inch, but I am really not sure. Re: 1/2" SUBFLOOR Bill, If the joist are ok and the 1/2 plywood subfloor is rated 16/32 which it probably is, the it meets the minimum requirements of the code. Additionally, underlayment plywood is a middle layer that keeps moisture from reaching the surface. What size number and length of screws should I use to screw 1/2 plywood underlayment to subfloor? A single 1/2" alone isn't good enough regardless of the finish flooring you choose, with the exception of hardwood. Had water damage under the halfbath floor (1" mudbed). This resulted in a ton of edge swell. The manual says you need 3/4 inch CDX plywood subfloor. When installing engineered, solid or floating floors that are less than 1/2" thick we highly recommended you add an additional layer of 3/8" or 1/2" thick plywood underlayment. Assuming a remodel, this is going to involve bringing the plywood to the location by hand, as opposed to assistance by a crane. Sturd-I-Floor® is an APA designation that is a combination subfloor-underlayment produced from OSB or plywood. Hide screw heads below the surface of your plywood pieces to … Tags: installing plywood underlayment, plywood underlayment Offset the underlayment seams from the subfloor seams by at least a foot or so for best results. The addtional underlayment should be glued and screwed down over 3/4 inch thick OSB subfloor to add stability. Removed all original flooring down to the 1/2" subfloor. The combined height is between 2-1/4″ and 5-1/4″ compared to 1″ for a DRICORE ® Subfloor R+ panel. If you intend to put down carpet or hardwood flooring, that won't be necessary. The pilot hole is … The uncoupling membrane is adhered to the surface being tiled using a layer of thinset adhesive applied with a 1/4-inch V-notch trowel. A conventional subfloor includes 2×4 sleepers, vapour barrier, 1″-2″ rigid insulation, 15/32″ plywood, and a lot of fastening. Steps to Install 3/4 Inch Plywood Subfloor. The right type of plywood for your bathroom's subfloor will vary based on the type of floor you are placing over it. It should not be so long that it penetrates the combined thickness of the plywood underlayment and subfloor. Prior to finished floor installation, walk the subfloor to check for squeaks, missing fasteners, improper nailing, etc. A 3/4 inch sheet of plywood weighs approximately 75 lbs. Forgetting to check your work. For the plywood, I’d need four 4’x8’ sheets total, and I should have a 4’x2’ piece left over. 3/4 inch pressure treated CDX goes for about $40 each where I am. Subfloor plywood is extremely strong and can support most floor types including plywood and treated plywood. Some people have told me it is not needed, but I want more opinions. Table 1 applies to unsanded plywood and is based on APA RATED SHEATH-ING (marked PS 1) grade. The thickness needed for subflooring depends on the type of floor that will go on top and the primary purpose for the subfloor. Plywood comes in a variety of thicknesses, beginning at 1/8 inch and increasing to 1 inch. I'm going to install tiger wood 3/4 inch hardwood floors in my house. And B-D. 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