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Product Specified Strengths (MPa)^{Footnote (2)} ^{Footnote (9)}
Material Thickness	Grade Species^{Footnote (1)}	Axial		Joist/Beam				Plank/Deck
Material Thickness	Grade Species^{Footnote (1)}	F_t^{Footnote (3)}	F_c	F_b^{Footnote (4)} ^{Footnote (5)}	F_v^{Footnote (6)}	MOE	F_c perp^{Footnote (7)}	F_b^{Footnote (8)}	F_v	F_c perp^{Footnote (7)}
19 mm to 45 mm	1.6 DF/LP/WH	15.80	23.10	27.25	3.65	11 030	9.40	32.25	2.45	6.05
	1.8 DF/LP/WH	18.50	26.15	31.15	3.65	12 410	9.40	36.80	2.45	6.05
	1.9 DF/LP/WH	19.80	27.60	33.15	3.65	13 100	9.40	39.20	2.45	6.05
	2.0 DF/LP/WH	21.15	29.00	35.05	3.65	13 790	9.40	41.45	2.45	6.05
	2.0 DF/LP/WH	21.15	29.00	36.95	3.65	13 790	9.40	43.70	2.45	6.05
	2.2 DF/LP/WH	23.75	31.60	39.00	3.65	15 170	9.40	46.05	2.45	6.05
	2.4 DF/LP/WH	26.45	33.90	42.90	3.65	16 550	9.40	50.70	2.45	6.05
	2.6 DF/LP/WH	29.15	36.00	46.80	3.65	17 925	9.40	55.35	2.45	6.05
46 mm to 89 mm	1.6 DF/LP/WH	15.80	23.10	24.60	3.65	11 030	9.40	29.15	2.45	6.05
	1.8 DF/LP/WH	18.50	26.15	28.15	3.65	12 410	9.40	33.25	2.45	6.05
	1.9 DF/LP/WH	19.80	27.60	29.90	3.65	13 100	9.40	35.35	2.45	6.05
	2.0 DF/LP/WH	21.15	29.00	31.65	3.65	13 790	9.40	37.45	2.45	6.05
	2.2 DF/LP/WH	23.75	31.60	35.25	3.65	15 170	9.40	41.60	2.45	6.05
	2.4 DF/LP/WH	26.45	33.90	38.75	3.65	16 550	9.40	45.80	2.45	6.05
	2.6 DF/LP/WH	29.15	36.00	42.25	3.65	17 925	9.40	49.95	2.45	6.05

Notes:

Footnote 1

DF = Douglas fir–larch, LP = lodgepole pine, WH = western hemlock. DF, LP and WH can be combined as western species (WS).

Return to footnote 1 referrer

Footnote 2

Specified strengths are based on covered, dry service conditions of use. Dry service conditions of use are those in which a 19% MC will not be exceeded.

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Footnote 3

The F_t values in the Table are adjusted to a 20-ft. gauge length to reflect the volume effects of length, depth and thickness for a range of common application conditions. The F_t values for the product may be higher when approved by the manufacturer for use as a component of engineered products, which are manufactured under a recognized quality control program.

Return to footnote 3 referrer

Footnote 4

F_b values include allowances for variations in span-to-depth ratio and method of loading, and may be used without further adjustments except as noted below. For product depths other than 305 mm, regardless of thickness, multiply table values by (305/d)^0.136. Adjustments for common depths are shown below. For product depths less than 89 mm, the multiplier for the 89-mm depth shall be used.

Depth and Multiplier
Depth (mm)	89	140	184	241	305	406	457	610
Multiplier	1.18	1.11	1.07	1.04	1.00	0.96	0.93	0.91

Return to footnote 4 referrer

Footnote 5

When structural members qualify as repetitive members in accordance with CSA O86, a 4% increase is permitted for Fb in addition to the increases permitted in Table Note 4. This increase does not apply to field-assembled, multi-member beams.

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Footnote 6

For simplicity, use 3.65 MPa for product depths up to 610 mm, and 3.35 MPa for product depths greater than 610 mm. When a more accurate analysis is desired, the allowable horizontal shear for all depths greater than 305 mm is F_v = 3.65 (305/d)^0.065.

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Footnote 7

F_c perp shall not be increased for the duration of the load.

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Footnote 8

Values shown are for thicknesses up to 89 mm.

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Footnote 9

Simple span uniform load deflection is calculated as follows:

$Δ = \frac{156 W L^{4} \times 10^{6}}{E b d^{3}} + \frac{2400 W L^{2}}{E b d}$

where:

Δ = deflection, mm

E = modulus of elasticity (MOE) (shear-free), MPa

W = specified uniform load, N/m

L = span, m

b = beam width, mm

d = beam depth, mm

Return to footnote 9 referrer

Equivalent Wood Species for Determining Fastener Capacities of the Product
Fastener Property	Nail Orientation	Load Direction	Specific Gravity (SG) of Equivalent Species for Design Purposes
Nail withdrawal	Edge	Withdrawal	Douglas fir–larch (N), SG = 0.50
Nail withdrawal	Face	Withdrawal	Douglas fir–larch (N), SG = 0.50
Lateral nail capacity	Edge	Parallel to grain	Douglas fir–larch (N), SG = 0.50
	Edge	Perpendicular to grain	Douglas fir–larch (N), SG = 0.50
	Face	Parallel to grain	Douglas fir–larch (N), SG = 0.50
	Face	Perpendicular to grain	Douglas fir–larch (N), SG = 0.50
Bolt axial capacity	—	Parallel to grain	Douglas fir–larch (N), SG = 0.50
Bolt axial capacity	—	Perpendicular to grain	Douglas fir–larch (N), SG = 0.50

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