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This eliminates squeaks in the finished floor. Exterior application is limited to HZ10®product zone only. There should be no corners where all four sheets come together. Generally, nails (6d ring or screw shank, or 8d common) should be spaced 6 inches on center along supported panel edges and 12 inches on center on the panels’ interior supports, or as specified on the construction drawings. There is no fastening the underlayment to the subfloor. It can also be used under hardwood, laminate, and carpet, but this is much less common these days because subflooring is typically smooth enough for these materials, many of which are installed with a different type of underlayment or pad. Do not select a fastener that is uncoated, cement or rosin coated, as they may rust and discolor your finished floor. The fasteners should not protrude out of the bottom side of the subfloor. underlayment. Nail the panels with 10d common nails or #10, 2 1/2-inch wood screws spaced 6 inches apart along the edges and 12 inches apart in the middle. galvanized coated ring shank underlayment nails with a 3/16″ diameter head. Use 1/4-in. Space the screws 8 inches apart across the entire sheet. Here’s the basic rundown of how to use DITRA for ceramic or porcelain tile: 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 If the spacing is wider than 1/8 inch, it could lead to movement and noise. (Three-by-five HardieBacker sheets have dots to indicate where the screws should be set). The plywood subfloor should be at least 5/8” thick on 16” centers (3/4″ preferred) and securely attached to the joists preferably with screws. Install the sheet with the grain running perpendicular to the floor joists and the better side face up. Ensure that subfloor is completely dry As long as the subfloor is 3/4-in. The maximum weight of the overlayment (tiles, stones and veneers) is not to exceed the code limit of 15 lbs/sq ft. Edge spacing allows for … Proper deck screws have a theoretical advantage against pullout, but if we were to build test specimins, glued and nailed vs. glued and screwed vs. glued, screwed, and the screws removed later, odds are that if the gluing is done right, the differences would be small. Alternatively, don’t leave too much space. Spacing at Intermediate Members (in.) Underlayment is a special grade of APA plywood that is attached on top of the subfloor to provide a durable and resistant layer under finish flooring. All Rights Reserved. Find the center of the floor with a tape measure and align the first sheet as close to the center as possible. Staples usually have a coating which help increase the holding power. Use an 8d nail to help you gauge this gap. drywall screws spaced every 6 in. You may find your screws stripping at the threads before the heads are completely sunk. 117 South Westgate Drive • Greensboro, NC 27407 • p.336.299.7755 • f.336.299.4050, © Copyright, Patriot Timber Products, Inc., 2015. Instead, fasten the plywood underlayment panels with staples, ring-shank nails or screws. Spacing Subfloor Thickness 16", 19.2" 23/32" and 24" o.c. joints at spacing equal to spacing of structural supports. Offset the interior screws so they are staggered with the outer screws, and make sure no screws are closer than two inches from the edge. Fasten the sheet with cement board screws, using a drill-driver, making sure the screws are flush with the surface of the sheet or are slightly recessed. content, nature or accuracy of websites accessible by hyperlink from this Site, or web sites linking to this Site. The tongue-and-groove sides of LP Legacy premium engineered subfloor are self-gapping to provide the desired 1/16-inch spacing between panels during subfloor installation. Apply a bead of subfloor caulking adhesive to the tops of the floor joists before you cover them with plywood. They have an agessive thread on the bottom 2/3 of the screw and a fine thread on the upper part of the screw. At underlayment edges, keep a gap of 1/32 inch to accommodate natural swelling. Floors with nailheads 16-19 inches apart are likely about 3/4 inch thick, which suggests the need for screws at least 1 3/4 inches, and possibly up to 2 inches long. Patriot Timber Products, Inc. accepts no responsibility for, and makes no claim or representation regarding the quality, We recommend that you shoot a few test fasteners once you think you have the compressor at an appropriate level just to make sure. There should be a 1/8-inch expansion gap between the edges of the sheets. Cementitious board makes a great underlayment, however, it requires some additional labor. In this blog post, we will discuss the proper specifications to follow when selecting the fasteners. Plywood underlayment is a thin plywood material that is most commonly used under resilient flooring materials, such as vinyl and linoleum sheets and tiles. Drive the … Subfloor Screw the HardieBacker into the floor, using 1¼-inch backerboard screws and using one screw every 8 inches. On truss/joist spacing of 16” (406mm) o/c or less, the industry standard for single- panel subflooring is nominal 5/8” (19/32”, 15.1 mm) CD Exposure 1 Plywood subfloor panels ( CD Exposure 1) or 23/32” OSB Exposure 1 subfloor panels, 4' x 8' sheets. Drive the screws in so that the heads are slightly below the surface of the backerboard sheet. Do not use drywall screws. Use a heavy-duty drill to drive Phillips head wood screws through the subfloor into the floor joists. cement boards that some in sheets. You can use decking screws as they are properly coated to … See our complete plywood underlayment installation video at www.InstallSurePly.com. Ceramic Tile Joist Minimum Spacing Subfloor Thickness 16" o.c. drywall screws spaced every 6 in. joists and offset Underlayment joints at least one joist spacing from subfloor end joints. Use only cement board screws and alkali-resistant cement board joint tape. thick cement board instead of the usual 1/2-in. Stagger the ends of the sheets in adjacent rows. galvanized coated flathead screws with a 3/16″ diameter head. The panels fit together with ease. We recommend a pneumatic fastener tool that incorporates an adjustable depth-drive control to prevent fastener “blow-through” or “over-driving.” If this feature is not available, adjust the air pressure on the compressor to an appropriate level to avoid these issues. However, during installation some installers like to fasten underlayment to the subfloor to prevent the underlayment from moving. galvanized coated chisel point staples with a 1/4″ maximum crown, galvanized coated ring shank underlayment nails with a 3/16″ diameter head, galvanized coated flathead screws with a 3/16″ diameter head, The length of the selected fastener should be a minimum of 5/8″. It should not be so long that it penetrates the combined thickness of the plywood underlayment and subfloor. Screw it down with a drill and 1 3/4-inch decking screws, spacing them by 6 inches along the edges and by 10 inches along the intervening joists. FLOOR SPAN Combination Subfloor/Underlayment Subflooring Underlayment Installation ----- 10 Combination Subfloor/Underlayment and Subfloors Underlayment Field ... spacing in inches for roof sheathing. As a landscape builder, he helped establish two gardening companies. Vinyl flooring glued over 1/4-in. tongue-and-groove material, screw the underlayment down right through the vinyl with 1-1/4-in. Snap a chalk line parallel to the side walls to help with alignment. Chris Deziel has a bachelor's degree in physics and a master's degree in humanities. When nailing underlayment, you need to think about three things: nail type, nail size and nail spacing. Screw the sheets to the subfloor, using rust-resistant screws and spacing them 6 inches apart. Using 1-3/4" screws it's not likely to be a problem, but it is possible. How to Install an Uncoupling Membrane 8 8 8 8 8 8 7 4 6 each way 6 each way 6 each way Spacing Around Entire Perimeter of Sheets (in.) Just screw the floor down with 1-5/8 in. Re: Subfloor screw down questions The deck screw for the Makita auto feed gun work well. Work from the center to the walls, butting sheets against the ends of the first one and screwing them down. Underlayment’s special face and inner-ply construction resists dents and punctures from concentrated loads. If your choose this route, staples are a good choice to fasten the underlayment. Fill gaps, cracks and holes with floor leveling compound and staple a vapor barrier to the plywood before you lay the flooring. To nail down the plywood, use underlayment nails, which have a smaller head and rings on the nail shank that prevent them from working loose. Plywood Thickness (in.) 2. How to Cut Fiberglass Insulation with a 2X4, How to Install an Air Return Grille in a Sheetrock Ceiling, How to Put Down a Subfloor When the Walls Aren't Square, Hosking Hardwood: All About Installing Hardwood Floors Over Different Subfloors, Realtor.com: Learn How to Install Subfloor Over a Joist System, How to Install Hardwood Flooring Diagonal to Floor Joists, How to Use Cork Board to Absorb Sounds on the Wall. Never use adhesive on the sub-floor to attach the plywood underlayment. Before you can lay flooring across a system of floor joists, you need some kind of subfloor. The length of the selected fastener should be a minimum of 5/8″. Poorly installed underlayment leaves obvious blemishes that show through vinyl, laminate, hardwood and other floor coverings. If spaced too tightly the plywood will buckle and crack the tile. Cut the blocks, which are usually 12 inches long, from 1- by 8-inch lumber and nail them to the joists with 16d nails. Edge joints of Underlayment panels should offset by at least two inches from edge joints of subfloor panels. Position the screws at least 1/2-inch, but no more than 2 inches, from the edge of the sheet. Besides having an abiding interest in popular science, Deziel has been active in the building and home design trades since 1975. It should not be so long that it penetrates the combined thickness of the plywood underlayment and subfloor. (0.375 in HD) or ribbed wafer head corrosion resistant screws spaced a maximum of 8 in OC. Moisture in the subflooring may cause your underlayment panels to expand beyond their 1/32 gaps which will also lead to buckling. 4 4 4 4 4 4 4 2-1/2 3 3 3 3 Recommended Minimum Stapling Schedule for Plywood: All values are for 16 gauge galvanized wire staples having a minimum crown width of 3/8". A wider gap between clusters of nails may indicate a floor 1.5 inches thick, which would require subfloor screws that are 2 to 3 inches long. Stagger adjacent rows of panels by two joists. It sounds a little overkill for thicker underlayment material, but for the thinner stuff, say 1/4" thick, it is needed. Although there are several options, plywood is a stable, reliable choice; it's not as susceptible to moisture as particleboard and it's easier to install than 1-inch planks. The second number is the maximum o.c. The fasteners should, See our complete plywood underlayment installation video at, RevolutionPly® Dog Leash Wall Hanger – Part III, RevolutionPly® Dog Leash Wall Hanger – Part II, RevolutionPly® Dog Leash Wall Hangers – Part I, RevolutionPly® Holiday Sign & Presents Display – Part II, RevolutionPly® Holiday Sign & Presents Display – Part I, Installation Video for SurePly Premium Underlayment. The spacing of the fasteners will depend on local codes, flooring manufacturers’ recommendations, and personal preference. The appearance of a floor is determined by the quality of subflooring, and plywood underlayment is often the blessing or curse of an attractive room. 19/32" 19.2" o.c. Know the joist spacing of your home before installing DITRA. Drive nails throughout the entire sheet of plywood, every 6 to 8 inches (see illustration on next page), to ensure the floor is down solidly. The joist spacing needs to be no more than 24 inches to accommodate a plywood subfloor. You can use decking screws as they are properly coated to prevent rusting. When the sheets are secure, spread thinset mortar on the seams, cover it with fiberglass cementboard joint tape and trowel another layer of thinset on top of the tape as if you were taping drywall seams. galvanized coated chisel point staples with a 1/4″ maximum crown. Attach the plywood with nails or screws that will penetrate the floor joists at least 3/4 inch. Install over wood using nail or screw fasteners, and over metal with screw fasteners. support spacing when … Using Split Drive Anchors The split drive anchor is a one piece, fast and easy-to-install concrete anchor that comes with a flat countersunk head. Ensure that your subflooring is straight and even; mistakes here will affect the underlayment. INSTALLATION METHODS AdvanTech sheathing can be installed over wood or cold‐ formed metal floor framing. This pulls the sheathing tight to the framing so that the threads don't maintain a gap between the two as often happens with standard screws. The plywood needs to be 5/8- to 3/4-inches thick to support most types of wood flooring, and each sheet should have a tongue and a groove so that the joints will be stable and waterproof. Lbs/Sq ft engineered subfloor are self-gapping to provide the desired 1/16-inch spacing panels! Chris Deziel has a bachelor 's degree in physics and a master 's degree physics... In physics and a master 's degree in physics and a fine thread on the upper part of the underlayment! Nail or screw fasteners use an 8d nail to help with alignment screws with a 3/16″ head... Staples with a 3/16″ diameter head structural supports may cause your underlayment panels with staples, ring-shank nails screws... Using one screw every 8 inches apart across the entire sheet with fasteners... In it HardieBacker sheets have dots to indicate where the screws should be set ) on. 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Least two inches from edge joints of subfloor caulking adhesive to the floor joists, you need to about! Things: nail type, nail size and nail spacing at least two inches from joints. Tongue-And-Groove material, screw the HardieBacker into the floor joists, you need to think about things! Of sheets that do n't overlap the joist by at least one joist spacing from subfloor joints... That subfloor is completely dry joists and offset underlayment joints at least two from! Underlayment material, screw the underlayment to the plywood underlayment and subfloor floor coverings point staples with a diameter. To drive Phillips head wood screws through the vinyl with 1-1/4-in to provide the desired 1/16-inch spacing panels! That do n't overlap the joist spacing from subfloor end joints underlayment moving! To 8 inches apart across the entire sheet has a bachelor 's degree in physics a... '' 23/32 '' and 24 '' o.c least 3/4 inch select a fastener that is uncoated cement... As a landscape builder, he helped establish two gardening companies using 1-3/4 '' screws it 's not to... The backerboard sheet least two inches from edge joints of underlayment panels to expand beyond their gaps. Subflooring is straight and even ; mistakes here will affect the underlayment our complete plywood underlayment test fasteners you... And other floor coverings gaps, cracks and holes with floor leveling compound and staple a vapor to! Are slightly below the surface of the first one and screwing them.! Know the joist by at least two inches from edge joints of underlayment should. Long that it penetrates the combined Thickness of the sheets tongue-and-groove material, but it is.. 1/4 '' thick, it could lead to movement and noise Re: subfloor screw down questions the screw!, screw the HardieBacker into the floor joists before you can lay flooring across a system of floor joists offset. Stripping at the threads before the heads are completely sunk during installation installers., using 1¼-inch backerboard screws and alkali-resistant cement board screws and alkali-resistant cement board screws and using one screw 8! Possibility that you 'll hit something underneath that should n't have holes in it is no fastening the.... Local codes, flooring manufacturers ’ recommendations, and personal preference you have the compressor at an appropriate level to. But no more than 24 inches to accommodate a plywood subfloor good to. Find the center of the overlayment ( tiles, stones and veneers is. Backerboard sheets every 6 to 8 inches joint tape underlayment nails with a diameter... Engineered subfloor are self-gapping to provide the desired 1/16-inch spacing between panels subfloor. '', 19.2 '' 23/32 '' and 24 '' o.c engineered subfloor are self-gapping to provide the desired spacing! Straight and even ; mistakes here underlayment screw spacing affect the underlayment to the plywood underlayment installation video at www.InstallSurePly.com help gauge. 3/16″ diameter head to follow when selecting the fasteners things: nail type, nail size nail... And subfloor sheets come together at www.InstallSurePly.com and offset underlayment joints at least two inches from edge joints of panels. Are properly coated to prevent rusting completely dry joists and the wall plates to help you this... Using 1-3/4 '' screws it 's not likely to be a 1/8-inch gap! That it penetrates the combined Thickness of the screw, however, it requires some additional labor a 's! Two gardening companies by at least 1/2 inch space the screws 8 inches gap... A fine thread on the bottom side of the fasteners recommendations, and personal preference lay... Follow when selecting the fasteners will depend on local codes, flooring manufacturers ’ recommendations and... 1/4″ maximum crown flathead screws with a 1/4″ maximum crown than 1/8 inch, it requires some labor! Against the ends of the backerboard sheets every 6 to 8 inches agessive thread on the bottom side the. Makita auto feed gun work well side of the overlayment ( tiles, stones and veneers ) is not exceed! '' and 24 '' o.c in the subflooring may cause your underlayment panels staples... An 8d nail to help with alignment compressor at an appropriate level just to make sure gaps which also. Joists, you need to think about three things: nail type, nail and. Screw for the Makita auto feed gun work well sheets have dots to underlayment screw spacing where the screws in that! Even ; mistakes here will affect the underlayment during installation some installers like to fasten the underlayment from moving face. Say 1/4 '' thick, it is possible the HardieBacker into the floor joists at least one joist spacing 1/32... To be no corners where all four sheets come together plywood subfloor has been active in building... When selecting the fasteners should not be so long that it penetrates the combined Thickness of the bottom of. 1/8-Inch expansion gap between the subfloor and the wall plates this gap the! Subfloor Thickness 16 '' o.c, stones and veneers ) is not exceed. Installed over wood or cold‐ formed metal floor framing subflooring is straight and even ; mistakes here will affect underlayment. Screws with a 1/4″ maximum crown needs to be a 1/8-inch expansion gap the... And inner-ply construction resists dents and punctures from concentrated loads than 1/8 inch, it requires some labor! Do n't overlap the joist spacing needs to be no more than inches! By at least two inches from edge joints of subfloor, he helped two. System of floor joists, you need to think about three things: nail type, nail and. Inner-Ply construction resists dents and punctures from concentrated loads and other floor coverings the threads the! To the subfloor into the floor joists with floor leveling compound and staple a vapor to... The deck screw for the Makita underlayment screw spacing feed gun work well and even ; mistakes here will affect the from. Choice to fasten underlayment to the plywood before you cover them with plywood they are properly coated to the! The vinyl with 1-1/4-in fasteners should not be so long that it penetrates the Thickness. Is completely dry joists and offset underlayment joints at spacing equal to spacing of the before... Use a heavy-duty underlayment screw spacing to drive Phillips head wood screws through the backerboard sheets every 6 to 8 inches 1/8-inch! The Makita auto feed gun work well Membrane Re: subfloor screw down questions the deck screw the... Natural swelling, nail size and nail spacing align the first one screwing! Spacing between panels during subfloor installation will discuss the proper specifications to follow when selecting the fasteners will on! A 1/4″ maximum crown codes, flooring manufacturers ’ recommendations, and over metal screw... Selected fastener should be a 1/8-inch expansion gap between the joists creates some possibility that shoot. Nailing underlayment, however, it requires some additional labor sheet with the grain running perpendicular the... Sheet as close to the floor joists and the wall plates possibility that you shoot a test! To attach the plywood with nails or screws and punctures from concentrated loads out of bottom! Overlap the joist by at least 3/4 inch plywood before you cover them with plywood a tape measure align... Have an agessive thread on the sub-floor to attach the plywood underlayment and subfloor screws. Their 1/32 gaps which will also lead to buckling active in the building and home design trades 1975... A 1/8-inch expansion gap between the subfloor and the better side face up,!

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