Page 13 of Wood Construction Connectors 2006 Catalog by Simpson Strong-Tie

14 Wood Construction Connectors IMPORTANT INFORMATION GENERAL NOTES a. Simpson Strong-Tie Co., Inc. reserves the right to change specifications, designs, and models without notice or liability for such changes. b. Steel used for each Simpson product is individually selected based on the products steel specifications, including strength, thickness, formability, finish, and weldability. Contact factory for steel information on specific products. c. Unless otherwise noted, dimensions are in inches, loads are in pounds. d. Unless otherwise noted, bolts and nails may not be combined to achieve highest load value. 8d (0.131"x2 "), 10d (0.148"x3"), and 16d (0.162"x3 specify common nails that meet the requirements of ASTM F1667. When a shorter nail is specified, it will be noted (for example 8dx1 ). Refer to page 16, 17, NDS (National Design Specification) and ASTM F1667 (American Society of Testing and Materials) for more nail info. e. Unless otherwise noted, allowable loads are for Douglas Fir-Larch under continuously dry conditions. Allowable loads for other species or conditions must be adjusted according to the code. In many cases, Simpson code reports will indicate loads derived from Doug Fir header material only. However under ICC-ES AC13, loads for Douglas Fir are the same as LVL, LSL, PSL, Glulams and Southern Pine, since the specific gravity of these wood species fall within the specific gravity range of the AC13 criteria. The chart below gives specific gravity for the different wood species as listed by NDS. For your convenience we have placed the section from the AC13 criteria indicating the range of specific gravity. 3.2.3 The species of lumber used shall have a specific gravity of 0.49 or greater, such as Douglas fir, but not greater than 0.55 as determined in accordance with the NDS. Species Fc^ Specific Gravity Douglas Fir-Larch (DF) 625 psi 0.50 Southern Pine (SP) 565 psi 0.55 Spruce-Pine-Fir (SPF) 425 psi 0.42 Hem Fir (HF) 405 psi 0.43 Glulam 560 psi 0.50 LVL (DF/SP) 750 psi 0.50 TimberStrand LSL (E=1.3x10 6) 680 psi 0.50 TimberStrand LSL (E 1.5x10 6) 880 psi 0.50 Parallam PSL 750 psi 0.50 f. For face-mount hangers straight straps, use 0.86 of table loads for Spruce-Pine-Fir. g. Simpson Strong-Tie Co., Inc. will manufacture non-catalog products provided prior approval is obtained and an engineering drawing is included with the order. Steel specified on the drawings as ", ", and will be 11 gauge (0.120"), 7 ga (0.179"), and 3 gauge (0.239"), respectively. The minimum yield and tensile strengths are 33 ksi and 52 ksi, respectively. h. All references to bolts or machine bolts (MBs) are for structural quality through bolts (not lag screws) equal to or better than ASTM Standard A307, Grade A. RFB is A307, Grade C; SSTB is ASTM A36. i. Unless otherwise noted, bending steel in the field may cause fractures at the bend line. Fractured steel will not carry load and must be replaced. j. A fastener that splits the wood will not take the design load. Evaluate splits to determine if the connection will perform as required. Dry wood may split more easily and should be evaluated as required. If wood tends to split, consider pre-boring holes with diameters not exceeding .75 of the nail diameter (2001 NDS 11.1.5.3). k. Wood shrinks and expands as it loses and gains moisture, particularly perpendicular to its grain. Take wood shrinkage into account when designing and installing connections. Simpson manufactures products to fit common dry lumber dimensions.If you need a connector with dimensions other than those listed in this catalog, Simpson may be able to vary connector dimensions; contact the factory. The effects of wood shrinkage are increased in multiple lumber connections, such as floorto-floor installations. This may result in the vertical rod nuts becoming loose, requiring post-installation tightening. l. Top flange hangers may cause unevenness. Possible remedies should be evaluated by a professional and include using a face mount hanger, and routering the beam or cutting the subfloor to accommodate the top flange thickness. m. Built-up lumber (multiple members) must be fastened together to act as one unit to resist the applied load (excluding the connector fasteners). This must be determined by the Designer/Engineer of Record. n. Do Not Overload. Do not exceed catalog allowable loads, which would jeopardize the connection. o. Some model configurations may differ from those shown in this catalog. Contact factory for details. p. Hanger Options (page 188) some combinations of hanger options are not available. In some cases, combinations of these options may not be installable. Horizontal loads induced by sloped joists must be resisted by other members in the structural system. A qualified designer must always evaluate each connection, including carried and carrying member limitations, before specifying the product. Fill all fastener holes with fastener types specified in the tables, unless otherwise noted. Hanger configurations, height, and fastener schedules may vary from the tables depending on joist size, skew and slope. See the allowable table load for the non-modified hanger, and adjust as indicated. Gauge may vary from that specified depending on the manufacturing process used. U and W hangers normally have single stirrups; occasionally, the seat may be welded. B, GLT, HGLT, HW, LBV, W and WNP hangers for sloped seat installations are assumed backed. To order a custom non-backed hanger, contact the factory. q. Simpson will calculate the net height for a sloped seat. The customer must provide the H1 joist height before slope. r. Truss plates shown are not manufactured by Simpson. s. Do not weld products listed in this catalog unless this publication specifically identifies a product as acceptable for welding, or unless specific approval for welding is provided in writing by Simpson. Some steels have poor weldability and a tendency to crack when welded. Cracked steel will not carry load and must be replaced. Refer to page 188 for hangers which can be welded. a. All specified fasteners must be installed according to the instructions in this catalog. Incorrect fastener quantity, size, type, material, or finish may cause the connection to fail. 16d fasteners are common nails (0.162" dia. x 3 long) and cannot be replaced with 16d sinkers (0.148" dia. x 3 long) for full load value unless otherwise specified. b. Bolt holes shall be at least a minimum of and no more than a maximum of larger than the bolt diameter (per the 2001 NDS 11.1.2). c. Install all specified fasteners before loading the connection. d. Some hardened fasteners may have premature failure if exposed to moisture. These fasteners are recommended to be used in dry interior applications. e. Use proper safety equipment. f. Welding galvanized steel may produce harmful fumes; follow proper welding procedures and safety precautions. Welding should be in accordance with A.W.S. (American Welding Society) standards. Unless otherwise noted Simpson connectors cannot be welded. g. Pneumatic or powder-actuated fasteners may deflect and injure the operator or others. Pneumatic nail tools may be used to install connectors, provided the correct quantity and type of nails (length and diameter) are properly installed in the nail holes. Tools with nail hole-locating mechanisms should be used. Follow the manufacturers instructions and use the appropriate safety equipment. Over driving nails may reduce allowable loads. Contact Simpson. h. Joist shall bear completely on the connector seat, and the gap between the joist end and the header shall not exceed per ASTM D1761 test standards. i. For holdowns, anchor bolt nuts should be finger-tight plus to turn with a hand wrench, with consideration given to possible future wood shrinkage. Care should be taken to not over-torque the nut. Impact wrenches should not be used as they may preload the holdown. j. Strong-Drive Screws shall not be installed through metal truss plates unless approved by the Truss Engineer (pre-drilling required). For additional information regarding fasteners installed through truss connector plates, refer to ANSI/TPI 1-2002 Section 8.10. INSTRUCTIONS FOR THE INSTALLER These notes are provided to ensure proper installation of Simpson Strong-Tie Company, Inc. products and must be followed fully.

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