Design Values

Make Specifying Cypress Easier

The American Lumber Standards Committee (ALSC) has certified the first-ever set of engineering design values for cypress. The design values now are recognized in model building codes across the United States.

The certification makes it much easier for architects and builders to specify cypress for structural applications, such as exposed beams, timbers, posts, columns, headers and other large structural or accent pieces.

Grading for structural cypress will be under the auspices of the Southern Pine Inspection Bureau (SPIB) (www.spib.org). Appearance-grade cypress will continue to be governed by the rules of the National Hardwood Lumber Association (NHLA) (www.natlhardwood.org).

Summary of Allowable Base Design Values for Baldcypress Dimension Lumber

Grade Extreme Fiber in Bending Fb Tension Parallel-
to-Grain
Ft
Compression Parallel-
to-Grain
Fc
Horizontal Shear Fv Compression Perpendicular-
to-Grain
Modulus of Elasticity, E
Select Structural 1200 650 1200 160 615 1,400,000
No. 1 1000 550 1050 160 615 1,400,000
No. 2 825 450 900 160 615 1,300,000
No. 3 475 250 525 160 615 1,200,000
Construction 925 500 1100 160 615 1,200,000
Standard 525 275 925 160 615 1,100,000
Utility 250 125 600 160 615 1,000,000
Stud 650 350 575 160 615 1,200,000
Design Values in Pounds Per Square Inch (psi)

Summary of Allowable Design Values for Cypress Timbers

Grade Extreme Fiber in Bending Fb Tension Parallel-
to-Grain
Ft
Compression Parallel-
to-Grain
Fc
Horizontal Shear Fv Compression Perpendicular-
to-Grain
Modulus of Elasticity, E
Select Structural 1150 750 1050 200 615 1,300,000
No. 1 1000 675 925 200 615 1,300,000
No. 2 625 425 600 175 615 1,000,000
Design Values in Pounds Per Square Inch (psi)

Comparisons Between Base Design Values for Baldcypress, Northern White Cedar, Western Cedars & Redwood Dimension Lumber

Species & Commercial Grade Size Classification Bending Fb Tension Parallel-
to-Grain
Ft
Compression Perpendicular-
to-Grain
Compression Parallel-
to-Grain
Fc
Modulus of Elasticity, E Grading Rules Agency
Baldcypress
Select Structural 2″ – 4″ thick 1200 650 615 1200 1,400,000 SPIB
No. 1 2″ and wider 1000 550 615 1050 1,400,000
No. 2 825 450 615 900 1,300,000
No. 3 475 250 615 525 1,200,000
Stud 650 350 615 575 1,200,000
Construction 2″ – 4″ thick 925 500 615 1100 1,200,000
Standard 2″ – 4″ wide 525 275 615 925 1,100,000
Utility 250 125 615 600 1,000,000
Northern White Cedar
Select Structural 2″ – 4″ thick 775 450 370 750 800,000 NeLMA
No. 1 2″ and wider 575 325 370 600 700,000
No. 2 550 325 370 475 700,000
No. 3 325 175 370 275 600,000
Stud 425 250 370 300 600,000
Construction 2″ – 4″ thick 625 375 370 625 700,000
Standard 2″ – 4″ wide 350 200 370 475 600,000
Utility 175 100 370 325 600,000
Western Cedars
Select Structural 2″ – 4″ thick 1000 600 425 1000 1,100,000 WCLIB
No. 1 2″ and wider 725 425 425 825 1,000,000 WWPA
No. 2 700 425 425 650 1,000,000
No. 3 400 250 425 375 900,000
Stud 550 325 425 400 900,000
Construction 2″ – 4″ thick 800 475 425 850 900,000>
Standard 2″ – 4″ wide 450< 275 425 650 800,000
Utility 225 125 425 425 800,000
Redwood
Clear Heart Structural 2″ – 4″ thick 1750 1000 650 1850 1,400,000 RIS
Select Structural 2″ and wider 1350 800 650 1500 1,400,000
Select Structural, open grain 1100 625 425 1100 1,100,000
No. 1 975 575 650 1200 1,300,000
No. 1, open grain 775 450 425 900 1,100,000
No. 2 925 525 650 950 1,200,000
No. 2, open grain 725 425 425 700 1,000,000
No. 3 525 300 650 550 1,100,000
No. 3, open grain 425 250 425 400 900,000
Stud 575 325 425 450 900,000
Construction 2″ – 4″ thick 875 475 425 925 900,000
Standard 2″ – 4″ wide 450 275 425 725 900,000
Utility 225 125 425 475 800,000/td>
Design Values in Pounds Per Square Inch (psi)

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