TECHNICAL RESOURCE SHEET

­floor, roof and wall panel installation

Achieving optimum performance with Weyerhaeuser Edge™ and Edge Gold™ oriented strand board (OSB) flooring and Weyerhaeuser sheathing­ depends heavily on correct installation and panel choice. End-user complaints can be avoided by choosing an appropriate panel for the application, practicing quality work, and installing ­Weyerhaeuser panels according to the techniques recommended here.

Safety Add shims or blocking as necessary to create Always make safety a priority on the job site. a smooth, flat surface. Verify that the panel's Follow all OSHA requirements for proper per- span rating meets or exceeds job require- sonal protection equipment (PPE), fall protec- ments. Soft spots may occur if joist on-center tion, forklift safety, and the use of equipment. spacing exceeds panel span rating. Adhere to Weyerhaeuser installation details, including the installation of safety bracing on Panels should be installed with the 8' length unsheathed floors and roofs. perpendicular to support members. When laying out flooring, make certain that each Consider that wet and/or steeply pitched panel covers at least two spans and the sheathing may be slippery. Make sure work- panel edges fall at the center of the support. Minimize the chance for ers have clean, slip-resistant roofing shoes It may be necessary to trim some panels. ­accidents by installing and use all safety restraints required by Make sure that the “This side down” stamp panels with the OSHA. To help minimize the chance for is on the underside. Lay out rows of panels textured side up. accidents, install panels with the textured so that end joints are offset by at least one (or screen) side up. Weyerhaeuser sheathing on-center spacing of the supports. is stamped “This side down” on the smooth face to ­facilitate safe installation. Gapping Panels The panel industry recommends spacing Storage wood-based panels to allow for the expan- Like any wood product, wood-based panels sion that occurs when they are exposed to are at risk of fungal decay or rot if exposed moisture. When installing ­Weyerhaeuser to repeated wetting or high-moisture flooring, maintain a 1⁄8" gap at panel ends environments. Panels that are exposed to and edges. See Figure 3 on page 2. such conditions may deteriorate, lose strength, or support mold growth. For these ­Weyerhaeuser single-layer flooring is reasons, protection from these conditions manufactured with a self-gapping tongue- must be provided. and-groove (T&G) profile that automatically gaps the edges as the floor is assembled. Keep all building materials dry and out of See Figure 1. A 10d box nail can be used to standing water prior to installation. gauge the ⅛" gap between panel ends. Weyerhaeuser panels should be stored at least 4" off the ground. During transit These spacing recommendations may not and storage, make sure the panels are be adequate for buildings over 80' in length not damaged. or width. See the recommendations for installing temporary Expansion Joints for Floors Floors in Large Buildings on page 3. Laying Panels Before installing flooring, make sure the To help prevent standing water on flooring, framing underneath is level and not twisted. and minimize moisture issues, Weyerhaeuser

W oODBywy.com 1.888.453.8358 Space Weyerhaeuser panels with a minimum 1⁄8" gap at ends and edges. T&G ­profile automatically gaps the edges. Down Pore® drainage groove with Edge Gold™ flooring

Stagger panel end joints recommends using Edge Gold™ panels with self-draining Down Pore® drainage grooves. Patented Down Pore® technology channels water through the panel and off the joists Approved subfloor below without the need to plug or patch later. adhesive Alternatively, consider drilling drainage holes through floors to allow water to escape. Patch ® Edges supported by blocking TJI joist, sawn when T&G is not present the holes later with wood dowels or non- lumber, or trusses shrink grout and backer plates. See Figure 2 for detail. Nailing per code (6" on-center along 11⁄8" TJ® Rim Board, 11⁄4" TimberStrand® LSL supported panel edges; 12" on-center or TJI® rim joist If spacing recommendations are not fol- in panel interior is typical). lowed, the flooring may buckle as it expands. While buckling itself may not cause any loss Figure 3 of structural integrity, it can result in other problems, including cracks in tile work and squeaks under hardwood floors. See page 7 for additional information on panel buckling. required, careful selection is necessary due to Continue working in rows until the flooring a wide range of performance between brands. is completely fastened. This technique keeps internal stresses—which could Start by snapping chalk lines across joists contribute to buckling later—from building every 4' as a visual aid for aligning panels up inside the flooring. and spreading glue. Before gluing, make Self-gapping panel sure joists are dry and free of dirt. Apply a 1⁄4" Drive nails flush to the panel face. Avoid bead of adhesive to the top of the joists and over-driving nails through the panel Figure 1 blocking (if used); use a serpentine pattern surface, especially when using a power- on supports that are 3½" or wider. driven tool. Refer to the recommendations under Special Considerations for Power- Drainage hole through floor. Apply only enough adhesive to install one or Driven Fasteners below. While nailing Plug later (after building is two panels at a time. Use two beads of adhe- flooring, straddle the fastener location to Floor panel “closed in”) with wood dowel or non-shrink grout sive on joists where panels meet to ensure ensure contact between the flooring and that both panels will adhere to the framing. the framing.

Install the first panel with the tongue edge Nailing schedules and types of fasteners will Wood structural panel backer plate; screw-glue toward the perimeter. This protects the vary depending upon the application and to underside of floor before plugging hole to support wood dowel or grout repair tongues on the remaining panels from being the thickness of the panel. See the table on damaged when they are slid into place. page 3 for Weyerhaeuser’s recommended Figure 2 schedules for single- and double-layer floors. Apply a thin 1⁄8" bead of glue in each groove Other code-approved fasteners may be and tap panels together. To reduce bumps used, but verify the spacing ­requirements. Gluing and Nailing in the finished floor, remove any excess glue Weyerhaeuser recommends gluing and nail- that may squeeze out. High-wind and seismic areas may require ing flooring to the joists and other applicable a different nailing schedule. In such cases, structural components. A glue-nailed floor Nail the flooring in place before the glue see section 2306.3 of the IBC for diaphragm assembly not only improves floor stiffness, sets; follow the adhesive manufacturer’s connection requirements, and check local especially with T&G panels, but also helps instructions for allowable cure time. building codes for requirements. eliminate nail pops, floor squeaks,­ vibrations, Remember that cure time is dependent on and bounce. Weyerhaeuser recommends temperature, climate, and other conditions. Special Considerations for Power-Driven using solvent-based subfloor adhesives that Fasteners meet ASTM D 3498 (AFG-01) performance Begin nailing by starting a row 3⁄8" from one Pneumatic staplers and nail guns are light- ­standards. When latex subfloor adhesive is edge and work across the flooring in rows. weight and do not provide enough force on

Weyerhaeuser Floor, Roof, and Wall Panel Installation Technical Resource Sheet OSB-4004 | December 2014 2 ±12" gap in wall bottom plate at expansion joint

Wall studs, typical 3⁄4" temporary expansion joint the panel to hold it tight to the framing as Plate filler at 80' intervals Doubler(1) block(1) it is nailed. Poor contact can cause the nail to pop or become loose enough to squeak Wall bottom plate, typical against the panel later on. Avoid this by After building is “closed in,” nail floor deck and fill having the operator stand on the flooring, or Wood structural panel floor deck expansion joint with wood strip or non-shrink grout apply hand pressure, next to the area being (provide a 1⁄8" gap at panel ends and edges) fastened as the nail is driven.

Most power-driven fasteners have adjust- (1) Install plate filler block and doubler to splice bottom plate after floor deck is nailed and building is “closed in.” ments for controlling pressure. If the pressure is set too high, it will countersink Figure 4 the fastener—something that should be avoided when installing flooring or sheathing. Adjust the pressure until the nails drive flush Fastening Schedule(1) for Flooring to the panel face. Nail Spacing Panel Thickness Nail Type At Panel Intermediate Expansion Joints for Floors in Edge(2) Supports(3) Large ­Buildings 19⁄ 32" – 1" 8d (0.131" x 2½") 6" o.c. 12" o.c. Dimensional changes in large buildings can Single-Layer Flooring be significant when the flooring absorbs 11⁄8" – 1¼" 10d (0.148" x 3") 6" o.c. 12" o.c. surrounding moisture and expands. The 6d deformed-shank ¾" and less (0.120" x 2") 6" o.c. 12" o.c. installation of temporary expansion joints Subflooring in can help reduce these problems. Double-Layer 7⁄8" – 1" 8d (0.131" x 2½") 6" o.c. 12" o.c. Flooring 11⁄8" – 1¼" 10d (0.148" x 3") 6" o.c. 12" o.c. The typical 1⁄8" panel gaps used in smaller structures may not be adequate for build- (1) Minimum per code. Tighter spacings may be required by the design professional of record. ings over 80' in length or width. In these (2) Nail spacing at panel edges applies to edges supported by framing members and edges at floor perimeters. buildings, add ¾" gaps at 80' intervals (or as (3) Nails must be spaced no more than 6" on-center at all supports where spans are 48" specified on the plan). Alternatively, do not or greater. nail the flooring at double joist locations until after the building has been dried in. After drying‑in, fill the expansion joints with a wood filler piece or non-shrink grout. Installing Finish Flooring construction. Do not fill nail holes, but do fill Make sure that the wall bottom plates do not Weyerhaeuser single-layer flooring does not and sand edge joints and any damaged cross expansion joints. After drying-in, splice require an additional underlayment beneath areas or gaps as necessary. the bottom plate of the wall together by adding a pad and carpet or hardwood flooring a filler block and a doubler between the wall finish. In all other applications such as tile, Installing Non-Load-Bearing studs. See Figure 4 for one framing possibility. fully adhered carpet, or sheet flooring, the Partition Walls floor panels should be supplemented with Due to the strength and stiffness of Subflooring an underlayment. Check the manufacturer’s ­Weyerhaeuser flooring, a typical partition ­Weyerhaeuser single-layer flooring is recommendations before installing. To wall can be supported anywhere along the designed and rated for use as a combination ensure tight joints and smooth appearance flooring without additional blocking when subfloor and underlayment in single-layer of the finish floor covering, be sure to glue the flooring is installed in accordance with floor construction, providing cost savings and the T&G joints. its labeled span rating (verify that the floor improved floor performance over multi-layer joists can carry the additional load). installations. ­Weyerhaeuser sheathing may Allow the flooring to dry before installing be used as a subfloor in flooring­ applications underlayment or finish flooring. Sand any For the best performance and to minimize where two layers of sheathing are used. uneven areas, making sure to check the squeaks, we recommend nailing the ­bottom ­Weyerhaeuser single-layer flooring is joints thoroughly. Inspect the fasteners, plate of the partition wall only where it manufactured to meet or exceed Voluntary making sure they are flush, and reset any intersects with a joist. The optimal place- Product Standard PS 2. nail pops that may have occurred during ment of non-load-bearing partitions that are

Weyerhaeuser Floor, Roof, and Wall Panel Installation Technical Resource Sheet OSB-4004 | December 2014 3 Maintain 1⁄8" gap Narrow width panels along all panel edges parallel to the joists is directly over a joist. When it is necessary to nail directly to the flooring, clinch all nails while they are Panel clips or Roofing felt or ­blocking as required shingle under- still accessible. Placing a bead of subfloor layment adhesive between the bottom plate and the flooring will enhance the connection and help prevent squeaks.

Floor Performance Floor panels are an important component in creating a floor system that feels good Weyerhaeuser sheathing to customers. The span rating shown on a panel represents a structurally acceptable ­performance level. Performance can be enhanced to meet higher customer expecta- tions in several ways. Consider u­ sing thicker Roof shingles panels for improved stiffness. Glue and nail flooring for improved connections that help Ventilated blocking resist vibrations, minimize nail pops, and transfer loads more evenly. Enhance overall Figure 5 floorp­ erformance by using stiffer joists or ­narrower joist spacing.

Choosing the optimal combination of these Fastening Schedule(1) for Walls and Roofs parameters is difficult. However, Trus Joist® In Regions with Basic Wind Speed Below 100 mph(2) TJ-Pro™ Ratings provide a reliable method for accurately predicting floor performance. Nail Spacing Sheathing Nail Type Contact your Weyerhaeuser representative ­Application At Panel Edge Intermediate for more information. Support Walls 6d (0.113" x 2")(3) 6" o.c. 12" o.c. Roofs Laying Sheathing Roofs(3) 8d (0.131" x 2½") 6" o.c. 12" o.c. Before installing sheathing, make sure the ­framing underneath is level and not twisted. (1) Minimum per code. Tighter spacings may be specified by the design professional of Add shims or blocking as necessary to cre- record and/or contract drawings. ate a smooth, flat surface. (2) In regions with a basic wind speed greater than 100 mph, roof sheathing must be fastened to intermediate supports at 6" o.c. for a minimum of 48" from ridges, eaves and gable-end walls, and 4" o.c. for fastening to gable-end wall framing. Panels should be installed with the 8' length (3) 8d (0.131" x 2½") nails are required with sheathing thicker than 7⁄16" perpendicular to support members. When laying out sheathing, make certain that each panel covers at least two spans and panel edges fall at the center of a support. It may sion that occurs when they are exposed to to serve as spacers between panels. See be necessary to trim some panels. Make excessive moisture. When installing Figure 6 on page 5. sure that the “This side down” stamp is on Weyerhaeuser sheathing, maintain a 1 ⁄8" the underside. Layout rows of panels so gap at panel ends and edges. See Figure 5. If spacing recommendations are not fol- that end joints are offset by at least one Use clips or blocking to support the roof lowed, sheathing may buckle as it expands. on-center spacing of the supports. sheathing edges. While buckling itself may not cause any loss of structural integrity, it can result in other Gapping Panels — Square Edge Sheathing With full panels, use a 10d box nail to problems, including ridging in roof shingles. The panel industry recommends spacing gauge the 1⁄8" gap between panels. In roof See page 7 for additional information on wood-based panels to allow for the expan- ­applications, some panel clips are designed panel buckling.

Weyerhaeuser Floor, Roof, and Wall Panel Installation Technical Resource Sheet OSB-4004 | December 2014 4 Full panel Full panel

Spacer clip Figure 6

Roof framing These spacing recommendations may not be adequate for buildings over 80' in length Omit roof sheathing panel in each course. Install “fill-in” or width. See the recommendations below panel as roofing is applied. for Expansion Joints for Roofs in Large (Laterally brace roof framing.) Buildings.

Gapping Panels — Edge Gold™ Figure 7 Tongue-and-Groove Sheathing For Weyerhaeuser roofing with our easy fit tongue-and-groove (T&G) profile, do not use clips. Our T&G profile has been designed to be self-gapping along the 8’ edge. To prevent Nailing schedules and types of fasteners will Complete the sheathing process by install- damage, DO NOT use a sledgehammer or vary depending upon the application and ing cut-to-size panels in the gaps. Cover with any other driving instrument when placing the thickness of the panel. See the table on roofing felt or shingle underlayment as soon panels. page 4 for Weyerhaeuser’s recommended as possible to minimize moisture absorp- schedules. Other code-approved fasteners tion. If the roof is very large, consider Correct gapping procedures must still be may be used, but verify required spacing. scheduling panel and underlayment used on the 4’ side of the panel, and can installation in sections. be accomplished by using a 10d box nail to High-wind and seismic areas may require gauge the ⅛" gap. a different nailing schedule. In such cases, Ventilation see Section 2306.3 of the IBC for diaphragm Avoid moisture accumulation under the roof Weyerhaeuser Edge Gold™ roof sheathing connection requirements. Panel clips may sheathing by providing adequate ventilation meets APA Structural 1 rating requirements also be required depending on the sheath- that meets applicable building codes. Per the for greater resistance to wind and seismic ing’s span rating and the actual framing 2006 IBC, Section 1203.2, install insulation loads. spacing. Check local building codes for with at least 1" of airspace between the insu- requirements. lation and the sheathing to provide adequate Nailing ventilation. Install baffles at the eaves to In general, begin nailing by starting a row ⅜" Cover with roofing felt or shingle underlayment ensure that the insulation does not block the from one edge and work across the sheath- as soon as possible. See Figure 5 on page 4 ventilation paths. ing in rows. Continue working in rows until and the Roof Performance section on page 6. the sheathing is completely fastened. This The minimum net area of free ventilation technique keeps internal stresses—which Expansion Joints for Roofs in Large space required is 1⁄150 of the area of the could contribute to buckling later—from build- ­Buildings space ventilated. This works out to be 960 ing up inside the panel. Unlike flooring, DO Dimensional changes in large buildings square inches for every 1,000 square feet of NOT glue roof sheathing. can be significant when the roof absorbs ceiling area. If an appropriate vapor retarder ­surrounding moisture and expands. An is installed on the warm side of the attic Drive nails flush to the panel. Avoid over- effective expansion joint in roofs can be cre- insulation, the net area of free ventilation driving nails through the panel surface, es- ated by omitting one panel in each course. may be reduced to a minimum of 1⁄300 of the pecially when using a power-driven tool. See See ­Figure 7. Make sure adequate safety area of the space ventilated, or 480 square Special Considerations for Power-driven precautions are in place to prevent workers inches per 1,000 square feet of ceiling area. Fasteners on page 2. from falling through openings.

Weyerhaeuser Floor, Roof, and Wall Panel Installation Technical Resource Sheet OSB-4004 | December 2014 5 Weyerhaeuser ­sheathing applied parallel or Stagger vertical ­perpendicular to wall studs joints

A minimum of 50% of the required vents must be at least 3' above the eave vents. When a ceiling is applied directly to the Provide underside of the roof framing, unobstructed blocking as ventilation paths from the eaves to the ridge required are required between each rafter. Finally, install vent pipes with roof ventilators to avoid heat and humidity build up.

Narrow Width Roof Sheathing Frequently when framing roofs, it is neces- sary to cut sheathing in narrow widths (24" wide or less) to accommodate ridges, hips, and valleys. In specialized construction, sheathing widths may even be 12" or less in Allow 1⁄8" gap at all sheathing ends and edges width. However, every effort should be made Figure 8 to ensure that no panel is less than 24" wide even if more than one row of panels must be cut. When narrow-width sheathing cannot be avoided, keep in mind the installation Support Recommendations for Narrow-Width Roof Panels recommendations that follow. Panel Width (PW) Support Recommendations Do not install narrow width sheathing at the ridge, which often experiences heavier foot Panel clips or blocking along the edge adjacent to the full width panel. An edge adjacent 16" ≤ PW < 24" traffic during construction and maintenance. to a ridge or valley does not require additional support unless required by code. Instead, locate them in intermediate rows in Lumber blocking along the edge adjacent to the full width panel. An edge adjacent to 12" ≤ PW < 16" the roof diaphragm. See Figure 5 on page 4. a ridge or valley does not require additional support unless required by code. Narrow-width sheathing should cover at Lumber blocking along both edges. A single piece of lumber may be considered blocking least two spans between rafters with the PW < 12" for both edges if both panel edges are 1" or less from the lumber edge. long dimension of the sheathing running perpendicular to the supports. One sheath- ing clip is required in a span of 16" or less and 2 clips—equally spaced—are required for spans over 16". reach ambient moisture conditions before ­perpendicular to the studs, blocking at the installing roof coverings. See page 7 for panel edges may be required. When sheath- Alternatively, lumber blocking may be used additional information on buckling. Use ing is installed horizontally, vertical joints either edgewise or flatwise along panel edg- heavyweight or laminated and textured should be staggered at least one on-center es. The minimum requirement is a 2x4, of shingles to help hide any imperfections in the stud space. Always leave a 1⁄8" gap around any grade except utility, attached per code. roof and to give the best appearance. all ends and edges of the sheathing, and See the table below for minimum ­support around windows and doors. Check local recommendations. Walls building codes for requirements on blocking Laying Panels edges with panels in either orientation. Roof Performance Weyerhaeuser sheathing is stamped “This Roof performance can be enhanced in several side down”. For wall applications, this stamp Do not exceed the approved spans stamped ways. Consider using thicker panels or panel has no relevance; it is intended for roof and on the sheathing. Even if the sheathing has clips, especially for low-slope or flat roofs. floor applications only. a roof span rating of 24" or greater, it should Minimize exposure to weather by applying not be used on walls with stud spacing shingle underlayment or #15 roofing felt (use Start the wall sheathing layout by placing greater than 24" on-center. #30 for extended exposures) that meets the 8' panel dimension either parallel or ASTM D 226 or ASTM D 4869 standards. perpendicular to the studs. See Figure 8. It is extremely important to fasten wall Minimize buckling by allowing the sheathing to However, when the 8' dimension is installed sheathing properly. Improper fastening of

Weyerhaeuser Floor, Roof, and Wall Panel Installation Technical Resource Sheet OSB-4004 | December 2014 6 wall and roof sheathing and their coverings Weyerhaeuser sheathing, like all wood problem is actually caused by buckling. Make is the primary cause of failure in high-wind building materials, should be allowed to a thorough inspection of the structure and events. See the table on page 4 for reach ambient moisture conditions before framing supports. Often, what appears at Weyerhaeuser's recommended fastening installation and before application of water- first glance to be a case of buckling turns out schedules. Check with local building codes resistant coverings. to be the result of faulty framing (warping, for any allowable fastener substitutions. misalignment, etc.). Panel Dimensions Gapping Panels On Weyerhaeuser square-edge, span- If buckling is the problem, one or more of the The panel industry recommends spacing rated panels, both the length and width following methods may help restore buckled wood-based panels to allow for the expansion dimensions are sized for spacing. Panels panels to a more satisfactory condition or that occurs when they are exposed to are manufactured to a nominal length of make the problem less noticeable: excessive moisture. When installing sheath- 96" and a nominal width of 48". The PS 2 ing, maintain a 1⁄8" gap at panel ends and standard sets dimensional requirements • Begin with moisture control. Find out what edges. See Figure 8. Use clips or blocking to for panels and allows a tolerance of ±1⁄16" caused, or is still causing, the high mois- support the panel edges. on the manufactured length and width. This ture condition and takes steps to eliminate tolerance enables panel manufacturers it. Address ventilation problems, examine With full panels, use a 10d box nail to gauge to cut panels that fit common support where moisture may be coming from within the 1⁄8" gap between panels. Additionally, some spacing yet still allow for the required 1⁄8" the building and redirect it to the outside. panel clips are designed to serve as spacers gap between panels. All Weyerhaeuser OSB between panels. See Figure 6 on page 5. panels are cut to allow for this 1⁄8" expansion • Try to speed up the drying process with gap, and their grade stamps include the fans or heaters to see whether sheathing If spacing recommendations are not fol- notation “Sized for Spacing” to verify that material recovers sufficiently. lowed, sheathing may buckle as it expands. fact. See page 8 for grade stamp examples. See Panel Buckling below. While buckling • Saw-kerf the edges of panels that have itself may not cause any loss of structural Panel Buckling been installed too tightly together to allow integrity, it can result in other problems, High-Risk Applications room for expansion and alleviate built-up including buckling of exterior siding. Certain field applications involve an in- pressure. creased potential for buckling and require General Roof and Wall Panel additional preventive measures. These • Install blocking under buckled areas and Considerations applications include diaphragm or shear wall flatten the sheathing to the blocking with Substitution for Plywood construction with edge nail spacing at 4" on- nails or screws. Weyerhaeuser sheathing is an acceptable center or less, oversized panels (larger than substitute for code-specified plywood sheath- 4' x 8'), and multiple panels installed with • If roofing is already installed and buckled ing. It also acts as conventional construction strength axis parallel to the framing. panel joint is only accessible from below, corner bracing ­so no additional bracing is screw in a cleat, as shown below in Figure 9. required. If the wall is a shear wall, additional In situations where shear wall or diaphragm considerations may apply. sheathing with a tight (4" on-center or less) • If sheathing buckles between fasteners, nailing schedule is likely to get wet during installing additional fasteners may help to Exposure Rating installation, temporarily fasten the sheathing level it out. The allowable exposure conditions for the at 12" on-center at ends, edges, and interme- panel are indicated in the grade stamp. diate supports. Then, finish nailing the pan- Panel joint Cleat Weyerhaeuser panels are rated for Expo- els at the specified nailing schedule after the sure 1 bond performance under Voluntary panels have adjusted to moisture conditions, Screws Product Standard PS 2. Exposure 1 panels or just before covering the panels. are intended to resist the effects of moisture on structural performance due to construc- Troubleshooting and Repair of Panel tion delays or other conditions of similar Buckling ­severity. Panels must be covered with a Before attempting to repair or correct for ­code-approved exterior roof or wall covering. sheathing unevenness, make sure that the Figure 9

Weyerhaeuser Floor, Roof, and Wall Panel Installation Technical Resource Sheet OSB-4004 | December 2014 7 How to Read a Weyerhaeuser Grade Stamp 1 1 1 Company logo 2 Recognized certification agency logo 3 Panel grade. Rated Sturd-I-Floor® panels are intended for 2 2 single-layer floor applications. Rated Sheathing panels are intended for roof, subfloor, and wall ­applications.

3 3 4 Span rating indicates the maximum single-layer floor support spacing for floor panels or the maximum roof/subfloor support 4 4 spacing for sheathing panels 5 5 6 6 5 Sized for Spacing indicates the panel has been sized to allow 7 7 for a ⅛" expansion gap between panels

8 8 6 PS 2 bond classification. Exposure 1 panels are suitable for 9 9 uses not p­ ermanently exposed to weather. Panels classified 10 10 as Exposure 1 are intended to resist the effects of moisture 11 11 on structural performance due to construction delays or other conditions of similar severity. 12 12 7 Panel thickness 8 Mill number 9 The most recent version of U.S. Dept. of Commerce Voluntary Product Standard PS 2 13 13 10 HUD/FHA recognition 11 PS 2 performance category 12 Grade stamp information for Canadian markets 13 Wood fiber sourcing certification 14 S trength axis indicates the orientation ­direction of the face layers 14 14 15 Weyerhaeuser website for more information. 15 15 16 Indicates which face of the panel should be placed down on the surface of the supports 16 16

Storing Weyerhaeuser OSB Products

Store and handle WARNING: Drilling, sawing, sanding or machining wood products Drape plastic over top and Weyerhaeuser OSB generates wood dust. The paint and/or coatings on this product sides. Allow air circulation. in a flat orientation

may contain titanium dioxide. Wood dust and titanium dioxide are DOWN PORE SELF-DRAINING substances known to the State of California to cause cancer. TECHNOLOGY For more information on Proposition 65, visit wy.com/inform woodbywy.com Nail plastic to top

Installation

■ Floor should be installedInstru as a glue-nailed system, usingctions a construction adhesive that meets the requirements of ASTM D 3498 (AFG-01). ■ Apply a bead of adhesive along the top ¼ of the joist flange;" diameter use two(or larger) No sanding. No delamination. We guarantee it. beads where panel edges meet. – Max span 20" o.c. ■ Install panels with the long dimension across supports. If panels are cut, ensure that a minimum of two spans are 54 pcs covered. ■ Gap panel ends ⅛ – Max span 32" o.c. nail can be used to gauge the gap. Tongue and groove edges 5⁄8" panels – are self-gapping. ". A 10d box ■ Nail the floor in place before □ " panels – 48 pcs – Max span 24" o.c. the glue sets, following the 23⁄32 adhesive manufacturer's instructions for allowable cure □ 7 time. Locate nails ⅜ ⁄8" panels – 39 pcs panel e dges. □ 18" panels – 30 pcs – Max span 48" o.c. For ⁄ 23 6d (2")⁄32 deformed" panels, useshank " from or 1 8d (2 □ ½ For ⅞ ") common nails. 8d (2 " and 1⅛ 8d (2½½ ") deformed" panels, shank use or Screws may") common be substituted nails. for nails noted above if the 12" net width screws have equivalent ⁄ Weyerhaeuser floor, roof and capacity. □ 47 □ 48" net width wall panels are intended for Drape plastic over □ Other specs ______dry-use applications each end and hold down with 2x4

CONTACT US

1.888.453.8358 woodbywy.com [email protected]

December 2014 Reorder OSB-4004 , Weyerhaeuser, Down Pore, TimberStrand, TJI and Trus Joist are registered trademarks, and Edge and This document supersedes all previous versions. If this is more Edge Gold are trademarks of Weyerhaeuser NR. © 2014 Weyerhaeuser NR Company. All rights reserved. than one year old, contact your dealer or Weyerhaeuser rep. Sturd-I-Floor is a registered trademark of the APA, The Engineered Wood Association. Printed in the USA.