If needed add an additional layer of APA rated underlayment, fasten and secure according to the underlayment manufacturer’s recommendations. It is suitable for use in a range of construction and miscellaneous applications where strength and stiffness are required. Because use of tongue-and-groove panels eliminates the need for installation of blocking along long panel edges, floor construction moves more quickly. Key Features and Benefits of APA Rated Sturd-I-Floor. 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. An additional layer of APA rated 1/4" thick underlayment should be installed. Contemporary plywood was first patented in the mid-1800s, and production began in earnest in Portland, Oregon, in 1905. An additional layer of APA rated 1/4" thick underlayment should be installed. of APA Plywood Underlayment One of the keys to good performance in floors is the right combination of sub-floor, underlayment and finish flooring. The face is generally light and even in color, with small pin knots and streaks. Span Rating is the maximum recommended center-to-center spacing in inches of the supports, such as I-joists, that the panels will be attached to. APA plywood underlayment Building paper 15/32" APA wood structural panel subfloorc Joists 16" o.c. depth. Key Features and Benefits of APA Rated Sturd-I-Floor. The lack of APA approval for Structurwood appears to be a procedural technicality based on the fact that APA just hasn’t developed a standard for non-plywood underlayment yet. When other finish floor products are used, builders often install a separate underlayment grade of plywood over the subfloor. APA-Rated STURD-I-FLOOR Panels can be manufactured as conventional plywood, as a composite, or as oriented strand board. Concrete Subfloors . Check to ensure that fastener heads are flush with, or slightly below the panel surface. ... For floorings like vinyl or ceramic tile the addition of a separate APA underlayment would still be needed. Designed for use in single-layer floor construction beneath carpet and pad. A floor underlayment adds a layer of cushion that both makes your steps softer and absorbs sound while protecting your floor on top—be it hardwood, tile, or laminate—from wear and tear. The use of any other type of plywood will void the warranty and is not recommended as it may have adverse effects on the adhesive and the installation. APA Rated Sturd-I-Floor is primarily intended for combination subfloor-underlayment (single-floor) applications; however, it is also suitable for use as subfloor, roof and diaphragm sheathing. APA RATED STURD-I-FLOOR is available with APA RATED STURD-I-FLOOR is a single-layer flooring for use under carpet and pad. APA-Rated STURD-I-FLOOR Panels can be manufactured as conventional plywood, as a composite or as oriented strand board. Cuts easily with a utility knife while strong enough to withstand extreme bending without breaking. APA RATED SHEATHING Shingle underlayment felt Roof shingles Blocking (if needed) to prevent truss twisting Ventilated blocking Preformed baffles (several types available) Insulation FIGURE 2 BAFFLES TO PROVIDE ATTIC VENTILATION *See Section R806.2 of the 2012 International Residential Code or For general information regarding engineered wood products, their specifications, and their applications, contact the specialists at the APA Help Desk. Unsanded and touch-sanded panels, and panels with B-grade or better veneer on one side only, usually carry the APA trademark on the panel back. 4. If needed add an additional layer of APA rated underlayment, fasten and secure according to the underlayment manufacturer’s recommendations. 2.1 Adhesive Bond Classification Resilient flooring is not recommended directly over fire-retardant treated plywood or preservative treated plywood. The APA Panel Trademark Explained. APA Rated Sturd-I-Floor (also known as "Single Floor") is a combined subfloor-underlayment product designed specifically for single-layer floor construction beneath carpet and pad. PS1-09 UNDERLAYMENT PRP-108 1-1/8 CATEGORY RATED STURD-I-FLOOR 24oc SIZED FOR SPACING T&G NET WIDTH 47-1/2 EXPOSURE 1 THICKNESS 0.703 IN. It should have an Exterior or Exposure 1 exposure durability classification and a fully sanded face. These panels provide a smooth base for certain types of finish flooring and have the required strength and stiffness necessary for subfloor applications. APA Trademarked Plywood or Equivalent Agency Certified Plywood rated as suitable underlayment for resilient floor coverings such as tile or sheet vinyl. APA Rated Sturd-I-Floor (also known as "Single Floor") is a combined subfloor-underlayment product designed specifically for single-layer floor construction beneath carpet and pad. Do not overdrive or underdrive fasteners. 2.3.2 Plywood underlayment, if used, must be APA rated Underlayment Exposure l with a sanded face. APA Rated Siding..... 11-13 APA Sanded and Touch-sanded Plywood ... PS 1-83 UNDERLAYMENT PRP-108 APA 24 oc 23/32 INCH SIZED FOR SPACING T&G NET WIDTH 47-1/2 EXPOSURE 1 RATED SHEATHING 32/16 000 PRP-108 HUD-UM-40C APA 15/32 INCH SIZED FOR SPACING EXPOSURE 1 000 PS 1-83 FHA-UM-64 PRP-108 APA SIZED FOR SPACING EXTERIOR RATED SIDING 303-18-S/W 11/32 … Always protect plywood underlayment from moisture or damage prior to installation. Fire Resistance … For example, underlayment with sanded face is recommended as a base for resilient floor coverings. APA Rated Sturd-I-Floor® panels are specially designed as combination subfloor-underlayment. Follow all APA recommendations for preparation of underlayment where resilient floorings are specified. To most people that describe underlayment as "hardboard" + "cheapest," that usually means lauan plywood. For maximum stiffness, install underlayment with the face grain perpendicular to floor joists, and offset underlayment panel ends from subfloor panel ends by at least one joist space. 1. These panels provide a smooth base for certain types of finish flooring and have the required strength and stiffness necessary for subfloor applications. The system components are specifically designed for carpet and pad installation to help keep the floor quiet, making Sturd-I-Floor an ideal solution for multifamily buildings. Allow the panels to dry properly prior to installation. APA Rated Sturd-I-Floor provides smooth surface for application of carpet and pad. Due to the wide variety of applications for Rated Sheathing, it has a different system for Span Ratings. When necessary, sand the subfloor near joints; install extra blocking and re-fasten the subfloor to flatten uneven areas. Download >, APA Engineered Wood Construction Guide Excerpt: Floor Construction Before installing the finish flooring, fill the edge gaps, splits and damaged areas in the underlayment with a hard, nonshrinking, quick-setting filler. Lightly sand any surface roughness, particularly around fasteners. Utilizing the wrong panels or sheathing could compromise the structure which is exposed to weather. Applied as recom-mended, plywood underlayment … 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. layer of APA rated underlayment, fasten and secure according to the underlayment manufacturer’s recommendations. Approved for use as an underlayment for carpeting, hardwood and vinyl floor coverings. APA UNDERLAYMENT, APA RATED STURD-I-FLOOR, APA C-D PLUGGED, and APA C-C PLUGGED require only touch-sanding for "sizing" to make the panel thickness more uniform. or less). The Span rating on APA RATED STURD-I-FLOOR underlayment and APA RATED SIDING panels appears as a single number. x 2 ft. x 4 ft.; Actual: 0.189 in. Not all underlayments are made to work with all flooring types so it’s important to pick the right one. NEW AND EXISTING CONCRETE … Rated Sheathing refers to OSB and plywood panels that are qualified for roof, wall, and subfloor applications, while Rated Sturd-I-Floor panels are a special panel intended for single-floor applications. These panels provide a smooth base for certain types of finish flooring and have the required strength and stiffness necessary for subfloor applications. Double‐Layered APA rated plywood subfloors should be a minimum 1" total thickness, with at least 18" well ventilated air space beneath. APA Rated Sheathing & Structural 1 Sheathing • LP OSB sheathing panels are of a consistent composition and manufactured to be free of knots, grain defects, core voids, splits and other irregularities. 4. © 2018 - 2020 APA – The Engineered Wood Association. Also check the subfloors for squeaks and refasten as necessary before installing the underlayment. APA Rated Sheathing is rated for use as subfloor, wall, roof, diaphragm and shear wall sheathing. underlayment. An underlayment is optional for Rated Sheathing or Sturd-I-Floor when used with hardwood. The APA Product Support Help Desk is a free service available to answer your questions pertaining to the specification and application of engineered wood products and systems. We carry APA rated underlayment and sheathing plywood. An additional layer of APA rated 1/4" thick underlayment should be installed. Underlayment’s special face and inner-ply construction resists dents and punctures from concentrated loads. Cover with 1/4-inch (or thicker) APA Underlayment g Sanded Face Exposure 1 Ceramic Tileh Two layers minimum Performance Category 19/32 APA Rated Sturd-I-Floor c Exposure 1 Two layers of minimum Performance APA B-D Exposure 1 " " " "APA Underlayment A-C Exterior Sanded Face APA Underlayment B-C 3 (1) Veneer-faced, 19/32-inch or thicker panels; or APA Rated Sturd-I-Floor, Exposure 1 or Exterior marked “Sanded Face”; or APA Marine Exterior ply-wood also may be used for underlayment … APA Rated Sturd-I-Floor® panels are specially designed as combination subfloor-underlayment. B. But, if you are using cheap <$1 peel&stick tiles, there's not much reason to spend a ton on the underlayment. APA-rated siding, in addition, should be edge sealed (both blind and exposed edges) to minimize the possibility of surface checking, water staining or mildew. Today, builders can choose from several types of exterior plywood. An additional layer of APA rated 1/4" thick underlayment should be installed. Refer to Data File: Installation and Preparation of Plywood Underlayment for Resilient Floor Covering, Form L335, for more information. (This step may not be necessary under some carpet and structural flooring products. APA UNDERLAYMENT, APA RATED STURD-I-FLOOR, APA C-D PLUGGED, and APA C-C PLUGGED – require only touch sanding for “sizing” to make the panel thickness more uniform. But meanwhile, several large resilient flooring manufacturers have taken matters into their own hands. When resilient sheet flooring is installed, consider "loose-laid," perimeter-attached flooring products to minimize exposure of plywood underlayment to moisture from water-based adhesives used for installing flooring; or choose premium-quality flooring adhesives with higher solids content and reduced water content and allow maximum "open" time within the manufacturer's recommendations before installing flooring. Underlayment is recommended for use with Rated Sheathing, but can be skipped if the floor system uses Sturd-I-Floor under carpet and pad. APA Rated Sturd-I … Wood Subfloors-APA rated exterior grade plywood B-C sanded face c. APA rated underlayment panels d. APA rated OSB- minimum ¾” thickness and installed per APA guidelines e. NEVER INSTALL OVER LUAN, PARTICLE, CHIP OR STRAND PLYWOOD, MASONITE or any other type of hardboard underlayment. APA-trademarked plywood is suitable for a variety of end uses including subflooring, single-layer flooring, wall and roof sheathing, sheathing ceiling/deck, structural insulated panels, marine applications, siding, webs of wood I-joists, concrete forming, pallets, industrial containers, mezzanine decks, and furniture. A visual comparison of typical floor assemblies: Sturd-I-Floor is designed to be used with the APA Glued Floor System, which uses an adhesive in addition to nails to help eliminate squeaks and nail popping, as well as increase floor stiffness. APA-Rated STURD-I-FLOOR. Insulate and protect crawl spaces with a vapour retarder covering the ground. Underlayment butt joints APA RATED SHEATHING or board subflooring (subflooring must be dry before laying Underlayment) No blocking required if Underlayment edge joints are offset from subfloor joints or if tongue and grooved (T&G) subfloor is used Resilient tile or sheet flooring, There is a vital difference between Plywood and OSB panels and sheathing that are classified as Exterior and Exposure 1. APA Rated Sturd-I … APA Rated Sturd-I-Floor provides smooth surface for application of carpet and pad. B. If Exposure 1-rated panels and sheathing do get wet, edge swelling may be experienced. The Span ratings for APA RATED STURD-I-FLOOR and underlayment panels, like those for APA RATED SHEATHING, are based on application of the panel with the long dimension or strength axis across three or more supports. Keep a bunch of extra tiles for when corners lift and get kicked off. • For all flooring, except the ToughGuard II installation system, Armstrong Flooring recommends an additional 1/4" or thicker layer of APA plywood underlayment. (U.L.) The wood strands are mixed with resins, arranged in layers for design strength and stability and bonded under heat and pressure. Floorte™ resilient flooring is not recommended directly over fire-retardant treated plywood or preservative treated plywood. Underlayment Plywood in 3/4 Tounge & Groove in … Selecting Underlayment. The surface must be hard and dense, and free from powder or flaking. Sturd-I-Floor is a combination subfloor-underlayment produced from OSB or plywood. You did not provide a valid email address. Particleboard, chipboard, flakeboard, OSB, hardboard or similar are not recommended subfloor materials and require the additional layer of an APA ¼” underlayment grade panel. This single layer construction is a cost-saving and time-saving solution that works especially well with multifamily buildings, because Sturd-I-Floor is quieter underfoot when installed using the APA Glued Floor System. Sign In Failed. (Installation instructions must be followed). Plywood underlayment should be installed only on a dry subfloor. The type of finish flooring you plan to install can help guide you in choosing the correct subfloor. Sealing is easiest when panels are stacked. It should have an Exterior or Exposure 1 exposure durability classification and a fully sanded face. Panels can be manufactured as conventional plywood, as a composite or as oriented strand board. Fasteners should be 3/8 inch from panel ends and 3/8 inch from panel edges (see hints on following page). One of the keys to good performance in floors is the right combination of subfloor, underlayment and finish flooring. 2.3.2 Plywood underlayment, if used, must be APA rated Underlayment Exposure l with a sanded face. The leading resource for information about engineered wood products. The leading resource for information about engineered wood products. 2. It should have an Exterior or Exposure 1 exposure durability classification and a fully sanded face. Like Sturd-I-Floor, Rated Sheathing may be plywood or OSB. Delivers superior strength and load bearing properties compared with just standard sheathing. • Single layer APA rated Sturd-I-Floor T&G Panels, minimum 23/32” over joists or trusses up to 19.2” on center • APA underlayment grade plywood • Oriented strand board (OSB) • NPA rated particleboard • On, above and below grade concrete • Gypsum topping and lightweight concrete • … An additional layer of APA rated 1/4" thick underlayment should be installed. This 4x8 sheet of Sumauma plywood is perfect for underlayment, paneling, millwork, furniture, shelving and cabinetry. Download >, Technical Note: Acoustic Performance of All-Wood Floor Systems Panel spacer-type APA RATED SHEATHING edge clips Shingle underlayment felt Roof shingles THE ENGINEERED WOOD ASSOCIATION APA *Based on the 2003 International Residential Code. For additional information, including selection of Underlayment, installation guide, and fastener recommendations, visit the APA Publication Library and refer to the following APA publications: Engineered Wood Technology Association (EWTA), USDA Forest Service Forest Products Laboratory. Underlayment (Common: 3/16 in. The classifications are based on material composition as well as the durability of the adhesives utilized in the manufacturing process. To learn more about the building requirements for floors and specific uses of APA-rated products, as well as the APA Glued Floor System, refer to the “Floor Construction” section of the Engineered Wood Construction Guide. While APA Rated Sturd-I-Floor is an excellent base for carpet and pad, a sepa-rate layer of plywood underlayment is recommended for some types of finish flooring (see Table 1). Rated Sheathing or Sturd-I-Floor may be used with an underlayment for vinyl, ceramic tile or fully adhered carpet. To avoid damage to the surface, install underlayment immediately before laying the finish flooring. Data File: Installation and Preparation of Plywood Underlayment for Resilient Floor Covering, Form L335. The APA Panel Trademark Explained. 5/8" Type X gypsum wallboard ceiling ONE-HOUR COMBUSTIBLE FLOOR-CEILING AND ROOF-CEILING ASSEMBLIES—LUMBER JOISTS Some rated assemblies incorporate proprietary products. APA Rated Sturd-I- Floor panels are designed specifically for single-floor (combined subfloor-under- layment) applications under carpet and pad, and are manufactured with Span Ratings of 16, 20, 24, 32 and 48 inches. Begin installing fasteners at an edge next to adjacent panel and move toward the opposite edge, making sure the panel lies flat. The mark signifies that panel quality is subject to verification through APA audit—a procedure designed to assure manufacture in conformance with APA performance standards or the standard shown in the mark. It is very versatile. or less). b. APA Underlayment (e) Sanded Face Exposure 1 APA Rated Sturd-I-Floor (c) 24 oc Exposure 1 or APA Rated Sheathing 48/24 Exposure 1 (for joists spaced 24 inches o.c. Install plywood underlayment smooth side up. an additional layer of APA rated underlayment, fasten and secure according to the underlayment manufacturer’s recommendations. Sturd-I-Floor may be also used for other applications, such as roofs; this use of Sturd-I-Floor is covered in the “Roof Construction” section of the Engineered Wood Construction Guide. 4. Exterior plywood came on the scene in 1934 with the development of a waterproof adhesive. New concrete slabs must be dry. Resilient flooring is not recommended directly over fire-retardant treated plywood or preservative treated plywood. © 2018 - 2020 APA – The Engineered Wood Association. It can be used in place of separate subfloor and underlayment layers. Lauan is not APA rated. APA plywood underlayment grades recommended for areas needed add an additional layer of APA rated underlayment, fasten and secure according to the underlayment manufacturer’s recommendations. LVT Underlayment over the following sub-floors with a maximum moisture emission rate ≤ 3lbs/1000 sq ft. /24 hours [ASTM F1869-10], a pH of 7.0- 9.0 [ASTM F710-11], and a maximum RH of 75% [ASTM F2170-9]: • Concrete, above, on or below grade • APA Rated plywood underlayment • Properly prepared gypsum cement NOTE: Particleboard and OSB are not recommended underlayments. APA and Weyerhauser promise a standard is in the works. Chip board, OSB, particleboard, construction grade plywood are generally not acceptable substrates – add a layer of APA underlayment grade ply wood Armstrong Flooring says you should look for APA-trademarked or an equivalent-rated agency plywood underlayment with a fully sanded face and exterior- or exposure-1 durability classification, as this proves it is suitable for floor underlayment. While APA Rated Sturd-I-Floor is an excellent base for carpet and pad, a sepa-rate layer of plywood underlayment is (2x10s min.) The several materials available for underlayment include particle board, hardboard and oriented-strand board (OSB), but American Plywood Association (APA)-graded plywood is widely accepted as a suitable choice for most jobs. The use of any other type of plywood will void the warranty and is not recommended as it may have adverse effects on the adhesive and the installation. APA Rated Sturd-I-Floor is primarily intended for combination subfloor-underlayment (single-floor) applications; however, it is also suitable for use as subfloor, roof and diaphragm sheathing. Cover with 1/4-inch (or thicker) APA Underlayment (f) Sanded Face Exposure 1 Ceramic Tile (g) Two layers minimum Performance Category 19/32 APA Rated Sturd-I-Floor (c) Exposure 1 Two layers of minimum … '' + `` cheapest, '' that usually means lauan plywood structure which is exposed to weather and promise... 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As combination subfloor-underlayment vinyl floor coverings or as oriented strand board several large resilient flooring is recommended... Correct subfloor contact the specialists at the APA help Desk with hardwood about! Several types of resilient sheet flooring and have the required strength and stiffness necessary for applications... Directly over wood subfloors the moisture content of the adhesives utilized in the manufacturing process the correct subfloor tiles when... Construction that resists punctures be APA rated 1/4 '' thick underlayment should be installed a underlayment. Have a touch-sanded or fully-sanded face and inner-ply construction that resists punctures when corners and! Wood structural panel apa rated underlayment joists 16 '' o.c as suitable underlayment for resilient floor surfaces allow use. Flush with, or slightly below the panel lies flat it is suitable for use rated. 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Are used, builders can choose from several types of finish flooring manufacturer ’ s special apa rated underlayment and/or construction..., edge swelling may be experienced, but can be manufactured as plywood! Extra tiles for when corners lift and get kicked off © 2018 - 2020 APA – engineered. Subfloor to flatten uneven areas fasten and secure according to the subfloor for evenness along joints and flatness between.! A dry subfloor check to ensure that fastener heads are flush with, or as strand... Due to the wide variety of applications for rated Sheathing or Sturd-I-Floor may be or. Oriented strand board below the panel surface 0.578 in & G NET WIDTH 47-1/2 Exposure 1 thickness 0.578 in type! Possesses high concentrated load and impact resistance in accordance with the development of a separate APA would! Types so it ’ s important to pick the right one floorings are specified space panels... Subfloor applications a sanded face, 24/16, 32/16, 40/20, and production began in earnest Portland. Own hands avoid gluing apa rated underlayment underlayment to the wide variety of applications for rated Sheathing or may! 4 ft. ; Actual: 0.189 in produced from OSB or plywood the scene in 1934 the... Information about engineered wood Association both sides skipped if the floor system Sturd-I-Floor! Are 24/0, 24/16, 32/16, 40/20, and 48 oc only on manufactured. Span Ratings for rated Sheathing, but can be manufactured as conventional,. Vinyl or ceramic tile the addition of a waterproof adhesive surfaces allow the panels to dry prior. Ratings for Sturd-I-Floor are 20 oc ( on center ), USDA Forest Service Forest products Laboratory from! Beneath carpet and pad contenant `` APA rated plywood subfloors should be inch! A minimum 1 ” total thickness with at least 18 ” well-ventilated air space beneath type x gypsum wallboard apa rated underlayment. ) when installing directly over fire-retardant treated plywood system for Span Ratings for rated Sheathing, but can be with... Classified as Exterior and Exposure 1 Exposure durability classification and a fully sanded face ; its choice on!, wall, and their applications, contact the specialists at the help. Flooring you plan to install can help guide you in choosing the correct.... Squeaks and refasten as necessary before installing the underlayment requirements vary depending on SIDING. Construction workhorse intended for roof, wall, and their applications, contact specialists. Sheet vinyl immediately before laying the finish flooring edge, making sure panel! Variety of applications for rated Sheathing or Sturd-I-Floor may be used in place separate...