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Table 1. Requirements for grades R-1 and O-1
Maximum Framing Member Spacing
(mm)
Nominal Thickness
(mm)
6.35 7.9 9.5 11.1 12.7 15.9 19.0
Applied directly to sheathing n/a Footnote (1) X Footnote (2) X X X X X
400 n/a n/a X X X X X
600 n/a n/a n/a n/a X X X
Table 2. Requirements for grade O-2 _ Face orientation
Orientation Maximum Framing Member Spacing (mm) Nominal Thickness
(mm)
_ _ 4.0 4.7 6.0 7.5 8.0 9.5 11.0 12.5 15.5 18.5

parallel to support

Applied directly to sheathing n/a Footnote (1) n/a X Footnote (2) X X X X X X X
400 n/a n/a n/a n/a X X X X X X
600 n/a n/a n/a n/a n/a n/a X X X X

perpendicular to support

400 n/a n/a X X X X X X X X
600 n/a n/a n/a n/a X X X X X X
Table 3. Property requirements Footnote (1)
Property Unit Direction Footnote (2) Grade
R-1
Grade
O-1
Grade
O-2

Modulus of rupture

MPa // ≥ 17.2 ≥ 23.4 ≥ 29.0
MPa ≥ 17.2 ≥ 9.6 ≥ 12.4

Modulus of elasticity

MPa // ≥ 3 100 ≥ 4 500 ≥ 5 500
MPa ≥ 3 100 ≥ 1 300 ≥ 1 500
Internal bond MPa - ≥ 0.345 ≥ 0.345 ≥ 0.345

Bond durability – modulus of rupture after 2 h boil

MPa // ≥ 8.6 ≥ 11.7 ≥ 14.5
MPa ≥ 8.6 ≥ 4.8 ≥ 6.2

Thickness swell – 24 h soak

% - ≤ 15 ≤ 15 ≤ 15
% - ≤ 10 ≤ 10 ≤ 10

Linear expansion — oven dry to saturated

% // ≤ 0.40 ≤ 0.35 ≤ 0.35
% ≤ 0.40 ≤ 0.50 ≤ 0.50

Lateral nail resistance Footnote (3)

N // ≥ 70t ≥ 70t ≥ 70t
N ≥ 70t ≥ 70t ≥ 70t