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*Glued Lumber: 4" and less in thickness, widths vary by product
See table 1 for design values
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Grade
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Grade Characteristics and Typical Uses
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See Dimension
Lumber Grades
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End-glued, face-glued, and edge-glued Southern Pine in glued assemblies, including stress-rated grades of finger-jointed 2" Dimension Lumber. There are two categories of structural finger-jointed lumber for two classifications of use. The most common use is for studs grademarked either STUD USE ONLY or VERTICAL USE ONLY. CERTIFIED EXTERIOR JOINTS can be used in either vertical or horizontal load applications, including studs, rafters, joists, headers, trusses, I-joists and glued-laminated timber.
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*Scaffold Plank: 2" and 3" thick, 8" and wider
See table 4 for design values
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Grade
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Grade Characteristics and Typical Uses
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Dense Industrial 72 Scaffold Plank
Dense Industrial 65 Scaffold Plank
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All Scaffold Plank design values are calculated using ASTM Standards D245 and D2555. These values are modified using procedures shown in "Calculating Apparent Reliability of Wood Scaffold Planks," as published by the Journal on Structural Safety, 2 (1984) 47-57, and updated in 1993.
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MSR Scaffold Plank: 2400f - 2.0E
MSR Scaffold Plank: 2200f - 1.8E
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Dressed to standard dry size prior to machine stress rating, and visually graded to assure that characteristics affecting strength are no more serious than the limiting characteristics for each grade. MSR Scaffold Plank is available 2"-thick only.
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*Stadium Grade: 2" thick, 4" to 12" wide
See table 1 for design values
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Grade
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Grade Characteristics and Typical Uses
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No.1 Dense Stadium Grade
No.1 Stadium Grade
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For outdoor seating. Free of pitch pockets, pitch streaks and medium pitch on one wide face, but otherwise conforms to No.1 Dense or No.1 Dimension Lumber.
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*Seawall grades: 2" to 4" thick, 6" to 14" wide
See table 1 for design values
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Grade
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Grade Characteristics and Typical Uses
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Any grade of Dimension Lumber
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One wide face and both adjacent narrow faces must be free of pith and/or heartwood. Application of the product requires pressure treatment by an approved treating process and preservative for marine usage.
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*Marine Grades: 1" to 20" thick, 2" to 20" wide
See tables 1 & 2 for design values
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Grade
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Grade Characteristics and Typical Uses
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Any grade of Dimension Lumber or Timbers
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All four longitudinal faces must be free of pith and/or heartwood. Application of the product requires pressure treatment by an approved treating process and preservative for marine usage.
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*Decking, Heavy Roofing and Heavy Shiplap: 2" to 4" thick, 2" and wider
See SPIB Grading Rules for design values
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Grade
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Grade Characteristics and Typical Uses
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Dense Standard Decking
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A superior decking grade, suitable for plank floor where face serves as finish floor. Has a better appearance than No.1 Dense Dimension Lumber because of additional restrictions on firm red heart, pith, knots and wane.
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Dense Select Decking
Select Decking
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An excellent decking grade that can be used face side down for roof decking or face side up for floor decking.
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Dense Commercial Decking
Commercial Decking
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An economical roof decking which conforms to No. 2 Dimension Lumber characteristics.
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Boards: 1" to 1-1/2" thick, 2" and wider
See table 1 for design values
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Grade
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Grade Characteristics and Typical Uses
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Industrial 55
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Graded as per No.1 Dimension Lumber.
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Industrial 45
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Graded as per No.2 Dimension Lumber.
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Industrial 26
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Graded as per No.3 Dimension Lumber.
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Design values are not assigned
No.1
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High quality with good appearance characteristics. Generally sound and tight-knotted. Largest hole permitted is 1/16". Superior product suitable for a wide range of uses including shelving, boxing, crating, and form lumber.
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Design values are not assigned
No.2
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Good-quality sheathing, fencing, shelving and other general purpose uses.
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Design values are not assigned
No.3
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Good, serviceable sheathing; usable for many economical applications without waste.
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Design values are not assigned
No.4
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Admits pieces below a No.3 grade which can be used without waste, or which contain less than 25% waste by cutting.
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* Most mills do not manufacture all products and make all grade separations. Those products and grades not manufactured by most mills are noted with an asterisk.
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