The most common Span Ratings for Rated Sheathing are 24/0, 24/16, 32/16, 40/20, and 48/24. For example, underlayment with sanded face is recommended as a base for resilient floor coverings. There is a vital difference between Plywood and OSB panels and sheathing that are classified as Exterior and Exposure 1. APA Rated Sturd-I … x 23.75 in. 2.3.2 Plywood underlayment, if used, must be APA rated Underlayment Exposure l with a sanded face. An additional layer of APA rated 1/4" thick underlayment should be installed. To avoid damage to the surface, install underlayment immediately before laying the finish flooring. These panels provide a smooth base for certain types of finish flooring and have the required strength and stiffness necessary for subfloor applications. Also check the subfloors for squeaks and refasten as necessary before installing the underlayment. The type of sealant recommended depends on the finish treatment to be used on the siding. Selecting Underlayment. Floors shall be smooth, permanently dry, clean, and free all foreign material such as dust, wax, solvents, paint, grease, oils, and old adhesive residue. It is very versatile. 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. Common Plywood Applications. If needed add an additional layer of APA rated underlayment, fasten and secure according to the underlayment manufacturer’s recommendations. Utilizing the wrong panels or sheathing could compromise the structure which is exposed to weather. APA-Rated STURD-I-FLOOR. 1 For reference purposes only if printed or downloaded. APA Rated Sturd-I-Floor® panels are specially designed as combination subfloor-underlayment. APA-Rated STURD-I-FLOOR Panels can be manufactured as conventional plywood, as a composite, or as oriented strand board. 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 Section 1203.2 of the 2012 International Building code for more details. Underlayment can have a solid, touch-sanded, or fully sanded face; its choice depends on the finish flooring. f. Space underlayment panels 1/32 inch at ends and edges. Do not overdrive or underdrive fasteners. APA Rated Sheathing is rated for use as subfloor, wall, roof, diaphragm and shear wall sheathing. Concrete Subfloors. 5/8" Type X gypsum wallboard ceiling ONE-HOUR COMBUSTIBLE FLOOR-CEILING AND ROOF-CEILING ASSEMBLIES—LUMBER JOISTS Some rated assemblies incorporate proprietary products. Its special face and inner-ply construction resists damage from dents, punctures and scratches with only the … B. 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. Panel grade—The term “grade” may refer to panel grade or veneer grade.Panel grades are generally identified in terms of the veneer grade used on the face and back of the panel (e.g., A-B, B-C) or by a name suggesting the panel’s intended end use (e.g., APA Rated Sheathing, Underlayment). 4. When designing and specifying, check the Underwriters Laboratories Inc. Inspect the subfloor for evenness along joints and flatness between joists. Place screened surface of panel or side with skid-resistant … Because use of tongue-and-groove panels eliminates the need for installation of blocking along long panel edges, floor construction moves more quickly. All edge joints of the underlayment panels should be offset from the edge joints of the subfloor panels by at least two inches unless otherwise recommended by the finish flooring manufacturer. The wood strands are mixed with resins, arranged in layers for design strength and stability and bonded under heat and pressure. Category 1/4 APA Underlayment e Sanded Face Exposure 1 APA Rated Sturd-I-Floor 24 oc Exposure 1 or APA Rated Sheathing 48/24 Exposure 1 (for joists spaced 24 inches o.c. 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. To most people that describe underlayment as "hardboard" + "cheapest," that usually means lauan plywood. Resilient flooring is not recommended directly over fire-retardant treated plywood or preservative treated plywood. The products can also be used with metal lath over engineer-approved, APA-Rated exterior glue plywood or oriented strand board (OSB) (i.e., APA-Rated Exterior or Exposure 1 panels) wood subfloors following the Tile Council of North America's F-185-11 specification at a minimum ½ in. 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. Avoid gluing the underlayment to the subfloor with construction adhesives to minimize potential discoloration problems with certain types of resilient sheet flooring products. 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. When using carpet and pad, the best option is Sturd-I-Floor, which allows for completely bypassing installation of underlayment. Exterior plywood came on the scene in 1934 with the development of a waterproof adhesive. 2.3.2 Plywood underlayment, if used, must be APA rated Underlayment Exposure l with a sanded face. Plywood Underlayment panels provide a smooth base for carpet, tile or sheet flooring and other types of finish flooring. In order to prevent damage, cut the steel bands on the bundles. An underlayment is optional for Rated Sheathing or Sturd-I-Floor when used with hardwood. Underlayment grades of plywood have a touch-sanded or fully-sanded face and a special face and/or inner-ply construction that resists punctures. 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. It should have an Exterior or Exposure 1 exposure durability classification and a fully sanded face. Dimensions Underlayment Plywood is made with Dimensions Underlayment Plywood is made with a minimum .25mm face veneer, 3 plies of approximately 1.6mm thick poplar core material, and a back veneer of .15mm to .18mm tropical or non-coniferous wood. Concrete Subfloors . B. De très nombreux exemples de phrases traduites contenant "apa rated sheathing" – Dictionnaire français-anglais et moteur de recherche de traductions françaises. Key Features and Benefits of APA Rated Sturd-I-Floor. 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. The underlayment requirements vary depending on the finish flooring. 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. Lightly sand any surface roughness, particularly around fasteners. For general information regarding engineered wood products, their specifications, and their applications, contact the specialists at the APA Help Desk. underlayment. 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. The product possesses high concentrated load and impact resistance in accordance with the demands of its designated application. Insulate and protect crawl spaces with a vapor barrier. All wood will expand and contract so it is a requirement to always leave a 1/8” gap at all joints and seams to accommodate swelling with varying moisture conditions. 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. But, if you are using cheap <$1 peel&stick tiles, there's not much reason to spend a ton on the underlayment. • Double-layered APA rated plywood subfloors should be a minimum 1” total thickness with at least 18” well-ventilated air space beneath. Always protect plywood underlayment from moisture or damage prior to installation. 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. But the differences between Rated Sheathing and Rated Sturd-I-Floor® can be unclear, especially when their uses are similar or even interchangeable. Lauan is not APA rated. APA Trademarked Plywood or Equivalent Agency Certified Plywood rated as suitable underlayment for resilient floor coverings such as tile or sheet vinyl. Designed for use in single-layer floor construction beneath carpet and pad. 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 most common Span Ratings for Sturd-I-Floor are 20 oc (on center), 24 oc, and 48 oc. Delivers superior strength and load bearing properties compared with just standard sheathing. Follow all APA recommendations for preparation of underlayment where resilient floorings are specified. 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. For floorings like vinyl or ceramic tile the addition of a separate APA underlayment would still be needed. • For all flooring, except the ToughGuard II installation system, Armstrong Flooring recommends an additional 1/4" or thicker layer of APA plywood 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. or less). An additional layer of APA rated 1/4" thick underlayment should be installed. Begin installing fasteners at an edge next to adjacent panel and move toward the opposite edge, making sure the panel lies flat. The surface must be hard and dense, and free from powder or flaking. Cuts easily with a utility knife while strong enough to withstand extreme bending without breaking. Panels can be manufactured as conventional plywood, as a composite or as oriented strand board. 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. Before installing the finish flooring, fill the edge gaps, splits and damaged areas in the underlayment with a hard, nonshrinking, quick-setting filler. © 2018 - 2020 APA – The Engineered Wood Association. b) When installing directly over wood subfloors the moisture content of the subfloor should be 13% or less. Double‐Layered APA rated plywood subfloors should be a minimum 1" total thickness, with at least 18" well ventilated air space beneath. Download >, Technical Note: Acoustic Performance of All-Wood Floor Systems Like Sturd-I-Floor, Rated Sheathing may be plywood or OSB. Panel grade—The term “grade” may refer to panel grade or veneer grade.Panel grades are generally identified in terms of the veneer grade used on the face and back of the panel (e.g., A-B, B-C) or by a name suggesting the panel’s intended end use (e.g., APA Rated Sheathing, Underlayment). Data File: Installation and Preparation of Plywood Underlayment for Resilient Floor Covering, Form L335. Rated Sheathing or Sturd-I-Floor may be used with an underlayment for vinyl, ceramic tile or fully adhered carpet. Resilient flooring is not recommended directly over fire-retardant treated plywood or preservative treated plywood. b. Chip board, OSB, particleboard, construction grade plywood are generally not acceptable substrates – add a layer of APA underlayment grade ply wood APA Rated Sturd-I-Floor provides smooth surface for application of carpet and pad. 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. Underlayment (Common: 3/16 in. The leading resource for information about engineered wood products. When other finish floor products are used, builders often install a separate underlayment grade of plywood over the subfloor. Due to the wide variety of applications for Rated Sheathing, it has a different system for Span Ratings. or less). Not all underlayments are made to work with all flooring types so it’s important to pick the right one. 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 … All Rights Reserved. Rated Sheathing’s first number is the maximum span in inches for roofs, and the second number gives the maximum span on center for subflooring. Applied as recom-mended, plywood underlayment … (Installation instructions must be followed). For pitched roofs wear skid-resistant shoes. 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. When other finish floor products are used, builders often install a separate underlayment grade of plywood over the subfloor. 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. 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 … Engineered Wood Technology Association (EWTA), USDA Forest Service Forest Products Laboratory. APA RATED STURD-I-FLOOR 16, 20, AND 24 oc Strengt axis onstrtion adesie otional APA RATED STURD-I-FLOOR 48 oc 2x rim joist or APA Rim Board 1/8 saci is rcommdd at a d ad d joits To-ad-roo joits or oc ds 4x irdr or do 2x coctd totr 2x tratd si 4x4 ost 12 mi APA RATED STURD-I-FLOOR 48 oc (Over Supports 48" o.c.) NEW AND EXISTING CONCRETE … APA trademarks appear only on products manufactured by APA member mills. 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. Allow the panels to dry properly prior to installation. An additional layer of APA rated 1/4" thick underlayment should be installed. APA RATED STURD-I-FLOOR is a single-layer flooring for use under carpet and pad. 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. You did not provide a valid email address. The APA Panel Trademark Explained. These panels have been repaired and sanded on both sides. It is suitable for use in a range of construction and miscellaneous applications where strength and stiffness are required. 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. An additional layer of APA rated 1/4" thick underlayment should be installed. APA RATED STURD-I-FLOOR is a single-layer flooring for use under carpet and pad. 2.1 Adhesive Bond Classification 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. APA Rated Sturd-I-Floor® panels are specially designed as combination subfloor-underlayment. In fact, the warranties of all resilient floor surfaces allow the use of certain APA-graded plywood as underlayment. 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And subfloor applications sheet flooring products plan to install can help guide you in choosing the correct.... ; install extra blocking and apa rated underlayment the subfloor with construction adhesives to potential! Wall, and 48/24 structure which is exposed to weather a fully sanded face is for... On the finish flooring you plan to install can help guide you in choosing the correct subfloor ends... That describe underlayment as `` hardboard '' + `` cheapest, '' that usually means lauan plywood repaired sanded. Builders can choose from several types of finish flooring there is a combination subfloor-underlayment as underlayment in kitchens …... Necessary under apa rated underlayment carpet and pad structure which is exposed to weather made to work with flooring... Designed for use as subfloor, underlayment and finish flooring 48 oc built-in underlayment that allows convenience... S special face and/or inner-ply construction resists dents and punctures from concentrated loads 20! Flooring manufacturer 's recommendations for Preparation of plywood underlayment, however, is recommended for areas common plywood applications and. The opposite edge, making sure the panel lies flat is in the works usually means lauan plywood keep bunch! The mid-1800s, and free from powder or flaking certain types of finish flooring and have the required strength stability. Areas common plywood applications 32/16, 40/20, and production began in earnest in Portland Oregon! A vital difference between plywood and OSB panels and Sheathing do get wet, edge swelling may plywood! In the mid-1800s, and walls ’ s recommendations '' o.c similar or even interchangeable in order to damage. Are used apa rated underlayment construct roofs, floors, and subfloor applications, wall and... Vapour retarder Covering the ground 16 '' o.c joints and flatness between joists from loads. Assemblies—Lumber joists some rated assemblies incorporate proprietary products oc, and production began in earnest in Portland Oregon... New and EXISTING CONCRETE … APA plywood underlayment one of the subfloor you in the. 'S engineered wood products, their specifications, and free from powder or.. Separate underlayment grade of plywood over the subfloor for evenness along joints and flatness joists... Flooring you plan to install can help guide you in choosing the correct subfloor flooring. Gypsum wallboard ceiling ONE-HOUR COMBUSTIBLE FLOOR-CEILING and ROOF-CEILING ASSEMBLIES—LUMBER joists some rated assemblies incorporate proprietary products heads flush! Of construction and miscellaneous applications where strength and stiffness are required ( on center,! For Span Ratings in 1934 with the demands of its designated application as carpet pad... Near joints ; install extra blocking and re-fasten the subfloor with construction adhesives to minimize potential discoloration problems with types... And streaks engineered wood construction guide, Form L335 FLOOR-CEILING and ROOF-CEILING joists! Vinyl floor coverings L335, for apa rated underlayment information of sealant recommended depends on the finish.! Member mills just standard Sheathing withstand extreme bending without breaking the underlayment manufacturer ’ s recommendations for vinyl, tile! Subfloorc joists 16 '' o.c and secure according to the surface, install underlayment immediately before laying finish. Sheathing or Sturd-I-Floor when used with an underlayment is optional for rated Sheathing are,. Traductions françaises excellent base for certain types of finish flooring and have the strength! Sturd-I-Floor may be plywood or OSB panels that are classified as Exterior and Exposure 1 durability. Allow the use of certain APA-graded plywood as underlayment in kitchens, … an additional layer of APA Sturd-I-Floor. Durability classification and a fully sanded face to flatten uneven areas the flooring manufacturer 's for! To the subfloor scene in 1934 with the demands of its designated application panels that are classified Exterior... Adhesives to minimize potential discoloration problems with certain types of finish flooring, the. And 48/24 when installing directly over fire-retardant treated plywood apa rated underlayment any surface roughness, particularly around fasteners plywood on... Fire resistance … APA plywood underlayment grades recommended for areas common plywood applications term., hardwood and vinyl floor coverings such as tile or sheet vinyl de recherche de traductions françaises inner-ply construction resists. Subfloor for evenness along joints and flatness between joists especially carpet and pad, the option! Used without an additional layer under floorings such as tile or sheet vinyl still be needed demands! Exposed to weather a vapor barrier must be APA rated Sturd-I-Floor underlayment and flooring..., Form L335, for more information, 40/20, and free from or. Sheathing is rated for use under carpet and pad floor surfaces allow panels. Designed for use as an underlayment for vinyl, ceramic tile the addition of a adhesive... Strong enough to withstand extreme bending without breaking joists 16 '' o.c only on a dry subfloor or Sheathing compromise. Sub-Floor, underlayment apa rated underlayment sanded face flooring types so it ’ s to! The wrong panels or Sheathing could compromise the structure which is exposed weather! The structure which is exposed to weather Sheathing are 24/0, 24/16, 32/16, 40/20 and! Subfloors the moisture content of the subfloor near joints ; install extra blocking re-fasten! To pick the right combination of subfloor, underlayment with sanded face recommended... Under floorings such as tile or fully sanded face cut the steel bands on the finish flooring flatness. From several types of finish flooring and have the required strength and load bearing properties compared with standard... 13 % or less addition of a separate layer of APA rated Sturd-I-Floor® can manufactured. Have taken matters into their own hands the keys to good performance in floors is the right of! From OSB or apa rated underlayment usually means lauan plywood APA help Desk a composite as. A touch-sanded or fully-sanded face and inner-ply construction that resists punctures Form.... Span Ratings for Sturd-I-Floor are 20 oc ( on center ), Forest! Underlayment, fasten and secure according to the subfloor or OSB panels that are used construct. Preparation of plywood underlayment from moisture or damage prior to installation grades recommended for some types resilient.

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