Floor, Roof, and Wall Panel Installation Technical Resource Sheet OSB-4004 | May 2012 2 ±12" Gap in Wall Bottom Plate at Expansion Joint

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 Floors Always make safety a priority on the job site. Laying Panels Follow all OSHA requirements for proper per- Before installing flooring, make sure the sonal protection equipment (PPE), fall protec- framing underneath is level and not twisted. tion, forklift safety, and the use of equipment. Add shims or blocking as necessary to create Adhere to Weyerhaeuser installation details, a smooth, flat surface. Verify that the panel's including the installation of safety bracing on span rating meets or exceeds job require- unsheathed floors and roofs. ments. Soft spots may occur if joist on-center Minimize the chance for spacing exceeds panel span rating. accidents by installing panels Consider that wet and/or steeply pitched with the textured side up. sheathing may be slippery. Make sure work- Panels should be installed with the 8' length ers have clean, slip-resistant roofing shoes perpendicular to support members. When and use all safety restraints required by laying out flooring, make certain that each OSHA. To help minimize the chance for panel covers at least two spans and the accidents, install panels with the textured panel edges fall at the center of the support. (or screen) side up. Weyerhaeuser sheathing It may be necessary to trim some panels. is stamped “This side down” on the smooth Make sure that the “This side down” stamp face to facilitate safe installation. is on the underside. Lay out rows of panels so that end joints are offset by at least one Storage on-center spacing of the supports. Like any wood product, wood-based panels are at risk of fungal decay or rot if exposed Gapping Panels to repeated wetting or high-moisture The panel industry recommends spacing environments. Panels that are exposed to wood-based panels to allow for the expan- such conditions may deteriorate, lose sion that occurs when they are exposed to strength, or support mold growth. For these moisture. When installing Weyerhaeuser reasons, protection from these conditions flooring, maintain a 1⁄8" gap at panel ends must be provided. and edges. See Figure 1 on page 2.

Keep all building materials dry and out of Weyerhaeuser single-layer flooring is standing water prior to installation. manufactured with a self-gapping tongue- Weyerhaeuser panels should be stored and-groove (T&G) profile that automatically at least 4" off the ground. During transit gaps the edges as the floor is assembled. and storage, make sure the panels are See Figure 2. A 10d box nail can be used to not damaged. gauge the 1⁄8" gap between panel ends.

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

Stagger panel end joints These spacing recommendations may not be adequate for buildings over 80' in length or width. For these cases, consider installing temporary expansion joints and drilling Approved construction drainage holes through floors to allow water adhesive to escape. Patch the holes later with wood dowels or non-shrink grout and backer ® Edges supported by blocking TJI joist, sawn when T&G is not present plates. See Figure 3 for detail. Alternatively, lumber, or trusses use Weyerhaeuser's Edge Gold™ flooring panels with self-draining Down Pore™ Rim joist or 11⁄4" TimberStrand® LSL rim ™ Nailing per code (6" on-center along technology. The Down Pore drainage supported panel edges; 12" on-center board or Trus Joist® 11⁄8" rim board grooves in Edge Gold™ flooring do not in panel interior is typical). require plugs or patching later. Also, see the recommendations for Expansion Joints for Figure 1 Floors in Large Buildings on page 3. only solvent-based construction adhesives Begin nailing by starting a row 3⁄8" from one that meet ASTM D 3498 (AFG-01) perfor- edge and work across the flooring in rows. mance standards. Based on experience and Continue working in rows until the flooring customer feedback, Weyerhaeuser does not is completely fastened. This technique Self-gapping panel recommend using water-based or polyure- keeps internal stresses—which could thane adhesives. contribute to buckling later—from building Figure 2 up inside the flooring. Start by snapping chalk lines across joists Drainage hole through floor. every 4' as a visual aid for aligning panels Drive nails flush to the panel face. Avoid Plug later (after building is and spreading glue. Before gluing, make over-driving nails through the panel surface, Floor panel “closed in”) with wood dowel sure joists are dry and free of dirt. Apply a especially when using a power-driven tool. or non-shrink grout 1⁄4" bead of approved elastomeric adhesive Refer to the recommendations under to the top of the joists and blocking (if used); Special Considerations for Power-Driven use a serpentine pattern on supports that Fasteners below. While nailing flooring, Wood structural panel backer plate; screw-glue are 3½" or wider. straddle the fastener location to ensure to underside of floor before plugging hole to contact between the flooring and the support wood dowel or grout repair Apply only enough adhesive to install one or framing. Figure 3 two panels at a time. Use two beads of adhesive on joists where panels meet to ensure Nailing schedules and types of fasteners will that both panels will adhere to the framing. vary depending upon the application and If spacing recommendations are not fol- the thickness of the panel. See the table on lowed, the flooring may buckle as it expands. Install the first panel with the tongue edge page 3 for Weyerhaeuser’s recommended While buckling itself may not cause any loss toward the perimeter. This protects the schedules for single- and double-layer floors. of structural integrity, it can result in other tongues on the remaining panels from being Other code-approved fasteners may be problems, including cracks in tile work and damaged when they are slid into place. used, but verify the spacing requirements. squeaks under hardwood floors. See page 7 for additional information on panel buckling. Apply a thin 1⁄8" bead of glue in each groove High-wind and seismic areas may require and tap panels together. To reduce bumps a different nailing schedule. In such cases, Gluing and Nailing in the finished floor, remove any excess glue see section 2306.3 of the IBC for diaphragm Weyerhaeuser recommends gluing and nail- that may squeeze out. connection requirements, and check local ing flooring to the joists and other applicable building codes for requirements. structural components. A glue-nailed floor Nail the flooring in place before the glue assembly not only improves floor stiffness, sets; follow the adhesive manufacturer’s Special Considerations for Power-Driven especially with T&G panels, but also helps instructions for allowable cure time. Fasteners eliminate nail pops, floor squeaks, vibrations, Remember that cure time is dependent on Pneumatic staplers and nail guns are light- and bounce. Weyerhaeuser suggests using temperature, climate, and other conditions. weight and do not provide enough force on

Weyerhaeuser Floor, Roof, and Wall Panel Installation Technical Resource Sheet OSB-4004 | May 2012 2 ±12" gap in wall bottom plate at expansion joint

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

Weyerhaeuser Floor, Roof, and Wall Panel Installation Technical Resource Sheet OSB-4004 | May 2012 3 Maintain 1⁄8" gap Narrow width panels along all panel edges intersects with a joist. The optimal place- ment of non-load-bearing partitions that are Panel clips or Roofing felt or blocking as required shingle under- parallel to the joists is directly over a joist. layment When it is necessary to nail directly to the flooring, clinch all nails while they are still accessible. Placing a bead of construction adhesive between the bottom plate and the flooring will enhance the connection and help prevent squeaks. Weyerhaeuser sheathing Floor Performance Floor panels are an important component in creating a floor system that feels good to customers. The span rating shown on a panel represents a structurally acceptable Roof shingles performance level. Performance can be enhanced to meet higher customer expecta- Ventilated blocking tions in several ways. Consider using thicker panels for improved stiffness. Glue and nail Figure 5 flooring for improved connections that help resist vibrations, minimize nail pops, and transfer loads more evenly. Enhance overall floorper formance by using stiffer joists or Fastening Schedule(1) for Walls and Roofs narrower joist spacing. In Regions with Basic Wind Speed Below 100 mph(3)

Choosing the optimal combination of these Nail Spacing Sheathing ® Nail Type parameters is difficult. However, Trus Joist Application At Panel Edge Intermediate TJ-Pro™ Ratings provide a reliable method Support for accurately predicting floor performance. Walls 6d (0.113" x 2")(2) 6" o.c. 12" o.c. Contact your Weyerhaeuser representative for more information. Roofs(3) 8d (0.131" x 2½") 6" o.c. 12" o.c.

Roofs (1) Minimum per code. Tighter spacings may be specified by the design professional of Laying Sheathing record and/or contract drawings. Before installing sheathing, make sure the (2) 8d (0.131" x 2½") nails are required with sheathing thicker than 7⁄16" (3) In regions with a basic wind speed greater than 100 mph, roof sheathing must be framing underneath is level and not twisted. fastened to intermediate supports at 6" o.c. for a minimum of 48" from ridges, eaves Add shims or blocking as necessary to cre- and gable-end walls, and 4" o.c. for fastening to gable-end wall framing. ate a smooth, flat surface.

Panels should be installed with the 8' length perpendicular to support members. When Gapping Panels With full panels, use a 10d box nail to laying out sheathing, make certain that each The panel industry recommends spacing gauge the 1⁄8" gap between panels. In roof panel covers at least two spans and panel wood-based panels to allow for the expan- applications, some panel clips are designed 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" gap the underside. Layout rows of panels so at panel ends and edges. See Figure 5. Use If spacing recommendations are not fol- that end joints are offset by at least one clips or blocking to support the roof sheath- lowed, sheathing may buckle as it expands. on-center spacing of the supports. ing edges. While buckling itself may not cause any loss

Weyerhaeuser Floor, Roof, and Wall Panel Installation Technical Resource Sheet OSB-4004 | May 2012 4 Full panel Full panel

Spacer clip Figure 6

of structural integrity, it can result in other problems, including ridging in roof shingles. See page 7 for additional information on panel buckling. Roof framing These spacing recommendations may not be adequate for buildings over 80' in length Omit roof sheathing panel in or width. See the recommendations for each course. Install “fill-in” Expansion Joints for Roofs in Large panel as roofing is applied. (Laterally brace roof framing.) Buildings.

Nailing Figure 7 In general, begin nailing by starting a row 3⁄8" from one edge and work across the sheathing in rows. Continue working in rows until the sheathing is completely fastened. This Cover with roofing felt or shingle underlay- that meets applicable building codes. Per the technique keeps internal stresses—which ment as soon as possible. See Figure 5 on 2006 IBC, Section 1203.2, install insulation could contribute to buckling later—from build- page 4 and the Roof Performance section with at least 1" of airspace between the insu- ing up inside the panel. Unlike flooring, DO on page 6. lation and the sheathing to provide adequate NOT glue roof sheathing. ventilation. Install baffles at the eaves to Expansion Joints for Roofs in Large ensure that the insulation does not block the Drive nails flush to the panel. Avoid over- Buildings ventilation paths. driving nails through the panel surface, es- Dimensional changes in large buildings pecially when using a power-driven tool. See can be significant when the roof absorbs The minimum net area of free ventilation Special Considerations for Power-driven surrounding moisture and expands. An space required is 1⁄150 of the area of the Fasteners on page 2. effective expansion joint in roofs can be cre- space ventilated. This works out to be 960 ated by omitting one panel in each course. square inches for every 1,000 square feet of Nailing schedules and types of fasteners will See Figure 7. Make sure adequate safety ceiling area. If an appropriate vapor retarder vary depending upon the application and precautions are in place to prevent workers is installed on the warm side of the attic the thickness of the panel. See the table on from falling through openings. insulation, the net area of free ventilation page 4 for Weyerhaeuser’s recommended may be reduced to a minimum of 1⁄300 of the schedules. Other code-approved fasteners Complete the sheathing process by area of the space ventilated, or 480 square may be used, but verify required spacing. installing cut-to-size panels in the gaps. inches per 1,000 square feet of ceiling area. Cover with roofing felt or shingle underlay- High-wind and seismic areas may require ment as soon as possible to minimize A minimum of 50% of the required vents a different nailing schedule. In such cases, moisture absorption. If the roof is very large, must be at least 3' above the eave vents. see Section 2306.3 of the IBC for diaphragm consider scheduling panel and underlay- When a ceiling is applied directly to the connection requirements. Panel clips may ment installation in sections. underside of the roof framing, unobstructed also be required depending on the sheath- ventilation paths from the eaves to the ridge ing’s span rating and the actual framing Ventilation are required between each rafter. Finally, spacing. Check local building codes for Avoid moisture accumulation under the roof install vent pipes with roof ventilators to avoid requirements. sheathing by providing adequate ventilation heat and humidity build up.

Weyerhaeuser Floor, Roof, and Wall Panel Installation Technical Resource Sheet OSB-4004 | May 2012 5 Weyerhaeuser sheathing applied parallel or Stagger vertical perpendicular to wall studs joints

Narrow Width Roof Sheathing Frequently when framing roofs, it is neces- Provide sary to cut sheathing in narrow widths (24" blocking as wide or less) to accommodate ridges, hips, required and valleys. In specialized construction, sheathing widths may even be 12" or less in width. However, every effort should be made 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 recommendations that follow.

Do not install narrow width sheathing at the Allow 1⁄8" gap at all sheathing ends and edges ridge, which often experiences heavier foot Figure 8 traffic during construction and maintenance. Instead, locate them in intermediate rows in the roof diaphragm. See Figure 5 on page 4. Support Recommendations for Narrow-Width Roof Panels Narrow-width sheathing should cover at least two spans between rafters with the long Panel Width Support Recommendations dimension of the sheathing running perpen- (PW) dicular to the supports. One sheathing clip Panel clips or blocking along the edge adjacent to the full width panel. An edge adjacent 16" ≤ PW < 24" is required in a span of 16" or less and 2 to a ridge or valley does not require additional support unless required by code. clips—equally spaced—are required for spans Lumber blocking along the edge adjacent to the full width panel. An edge adjacent to over 16". 12" ≤ PW < 16" a ridge or valley does not require additional support unless required by code.

Lumber blocking along both edges. A single piece of lumber may be considered blocking Alternatively, lumber blocking may be used PW < 12" for both edges if both panel edges are 1" or less from the lumber edge. either edgewise or flatwise along panel edges. The minimum requirement is a 2x4, of any grade except utility, attached per code. See the table below for minimum support recommendations. Walls Laying Panels requirements on blocking edges with panels Roof Performance Weyerhaeuser sheathing is stamped “This in either orientation. Roof performance can be enhanced in side down.” For wall applications, this stamp several ways. Consider using thicker panels has no relevance; it is intended for roof and Do not exceed the approved spans stamped or panel clips, especially for low-slope or flat floor applications only. on the sheathing. Even if the sheathing has roofs. Minimize exposure to weather by a roof span rating of 24" or greater, it should applying shingle underlayment or #15 roofing Start the wall sheathing layout by placing the not be used on walls with stud spacing felt (use #30 for extended exposures) that 8' panel dimension either parallel or perpen- greater than 24" on-center. meets ASTM D 226 or ASTM D 4869 dicular to the studs. See Figure 8. However, standards. Minimize buckling by allowing the when the 8' dimension is installed perpen- It is extremely important to fasten wall sheathing to reach ambient moisture dicular to the studs, blocking at the panel sheathing properly. Improper fastening of conditions before installing roof coverings. edges may be required. When sheathing is wall and roof sheathing and their coverings See page 7 for additional information on installed horizontally, vertical joints should be is the primary cause of failure in high-wind buckling. Use heavyweight or laminated and staggered at least one on-center stud space. events. See the table on page 4 for textured shingles to help hide any imperfec- Always leave a 1⁄8" gap around all ends and Weyerhaeuser's recommended fastening tions in the roof and to give the best edges of the sheathing, and around windows schedules. Check with local building codes appearance. and doors. Check local building codes for for any allowable fastener substitutions.

Weyerhaeuser Floor, Roof, and Wall Panel Installation Technical Resource Sheet OSB-4004 | May 2012 6 Gapping Panels Panel Dimensions If buckling is the problem, one or more of the The panel industry recommends spacing On Weyerhaeuser square-edge, span- following methods may help restore buckled wood-based panels to allow for the expan- rated panels, both the length and width panels to a more satisfactory condition or sion that occurs when they are exposed to dimensions are sized for spacing. Panels make the problem less noticeable: excessive moisture. When installing sheath- are manufactured to a nominal length of ing, maintain a 1⁄8" gap at panel ends and 96" and a nominal width of 48". The PS 2 • Begin with moisture control. Find out edges. See Figure 8 on page 6. Use clips or standard sets dimensional requirements for what caused, or is still causing, the high blocking to support the panel edges. panels and allows a tolerance of +/− 1⁄16" moisture condition and takes steps to on the manufactured length and width. This eliminate it. Address ventilation problems, With full panels, use a 10d box nail to gauge tolerance enables panel manufacturers examine where moisture may be coming the 1⁄8" gap between panels. Additionally, to cut panels that fit common support from within the building and redirect it to some panel clips are designed to serve as spacing yet still allow for the required 1⁄8" the outside. spacers between panels. See Figure 6 on gap between panels. All Weyerhaeuser OSB 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- Weyerhaeuser panels are rated for Exposure els at the specified nailing schedule after the 1 bond performance under Voluntary Product panels have adjusted to moisture conditions, Standard PS 2. Exposure 1 panels are or just before covering the panels. intended to resist the effects of moisture on structural performance due to construction Troubleshooting and Repair of Panel Panel joint Cleat delays or other conditions of similar sever- Buckling Screws ity. Panels must be covered with a code- Before attempting to repair or correct for approved exterior roof or wall covering. sheathing unevenness, make sure that the problem is actually caused by buckling. Make Weyerhaeuser sheathing, like all wood build- a thorough inspection of the structure and ing materials, should be allowed to reach framing supports. Often, what appears at ambient moisture conditions before installa- first glance to be a case of buckling turns out tion and before application of water-resistant to be the result of faulty framing (warping, coverings. misalignment, etc.). Figure 9

Weyerhaeuser Floor, Roof, and Wall Panel Installation Technical Resource Sheet OSB-4004 | May 2012 7 THICKNESS 0.418 IN THICKNESS 0.703 IN How to Read a Weyerhaeuser Grade Stamp 1 Company logo. 1 1 2 Recognized certification agency logo. 3 Wood fiber sourcing certification 4 PS 2 performance category. 2 2 5 Panel grade. Single floor panels are intended for single-layer floor applications. Sheathing panels are intended for roof, subfloor, and wallapplications.

6 Span rating indicates the maximum single-layer floor support 3 3 spacing for floor panels or the maximum roof/subfloor support spacing for sheathing panels.

Certified Sourcing Certified Sourcing 7 PS 2 bond classification. Exposure 1 panels are suitable for www.sfiprogram.org www.sfiprogram.org uses not per manently exposed to weather. Panels classified S F I - 0 0 0 0 8 S F I - 0 0 0 0 8 as Exposure 1 are intended to resist the effects of moisture 4 7/16 CATEGORY 4 23/32 CATEGORY on structural performance due to construction delays or other 5 conditions of similar severity. 5 SINGLE FLOOR 8 The most recent version of U.S. Dept. of Commerce Voluntary 6 6 24˝ O.C. Product Standard PS 2. 7 7 9 HUD/FHA recognition. 8 9 8 9 10 Mill number. 10 2 10 2 11 Grade stamp information for Canadian markets. 11 1R24 / 2F16 11 1F24 1.0 mm CSA 18.0 mm CSA 0325 1 0325 12 Strength axis indicates the orientation direction of the face layers.

13 Sized for Spacing indicates the panel has been sized to allow for an expansion gap between panels. 13 12 13 12 14 Indicates which face of the panel should be placed down on the 14 14 THIS SIDE DOWN THIS SIDE DOWN surface of the supports. www.woodbywy.com15 www.woodbywy.com15 15 Weyerhaeuser website for more information. MADE IN USA MADE IN USA

Storing Weyerhaeuser OSB Products Drape plastic over top and Store and handle sides. Allow air circulation. WARNING: Drilling, sawing, sanding or machining wood Weyerhaeuser OSB products generates wood dust, a substance known DOWN PORE SELF-DRAINING in a flat orientation TECHNOLOGY to the State of California to cause cancer. For more

information on Proposition 65, woodbywy.com visit www.wy.com/inform. 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 ⁄ capacity. □ 47 □ 48" net width Weyerhaeuser floor, roof and Drape plastic over each end □ Other specs ______wall panels are intended for and hold down with 2x4 dry-use applications

1.888.453.8358 www.woodbywy.com [email protected]

May 2012 Reorder OSB-4004 , Weyerhaeuser, TimberStrand, TJ, TJI and Trus Joist are registered trademarks, and Down Pour, This document supersedes all previous versions. If this is more Edge and Edge Gold are trademarks of Weyerhaeuser NR. © 2012 Weyerhaeuser NR Company. than one year old, contact your dealer or Weyerhaeuser rep. All rights reserved.