Structural Light Framing
Select Structural
Douglas Fir
Select Structural is recommended
for use in applications where both high strength and stiffness values
and good appearance are required. Sound, firm, encased and pith knots are limited up to no larger than 22 mm. They must be tight and well spaced. Unsound or loose knots or holes are limited to no larger than
19 mm, with one per 1.2 metres allowed. Tight limitations are placed on characteristics affecting strength. Piece #5 shows allowable heart pith.
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No. 1
Douglas Fir
Recommended for construction where high strength and stiffness values and good appearance are desired. Knots must be of the same type as in Select Structural grade, with size no greater than 38 mm. Unsound or loose knots or holes are limited to no larger than 25 mm, with one allowed per 91 cm. Allowable wane, as in pieces #2 and #3, is described for Hem-Fir example of
No. 1 grade.
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No. 2
Douglas Fir
Recommended for most general construction uses. Well-spaced knots of any quality are allowable
in sizes up to 51 mm, with one hole up to 32 mm in diameter allowable per 61 cm. Allowable wane, as in piece #4, described for Hem-Fir example of No. 2 grade. Piece #1 appears to be above grade, however a full-length machine skip makes
it a No. 2.
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Select Structural
Hem-Fir
Select Structural is recommended for use in applications where both high strength and stiffness values and good appearance may be required. Sound, firm, encased and pith knots are limited up to no larger than 22 mm. They must be tight and well spaced. Unsound or loose knots or holes are limited to no larger than 19 mm, with one per 1.2 metres allowed. Piece #4 shows allowable centerline knots up to 22 mm.
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No. 1
Hem-Fir
Knots must be of the same type as
in Select Structural grade, with size no greater than 38 mm. Unsound or loose knots or holes are limited to no larger than 25 mm, with one allowed per 91 cm. Wane is allowable, as in piece #2, up to 1/4 the thickness and 1/4 the width full length, or equivalent on each face, provided that wane not exceed 1/2 the thickness or 1/3 the width for
up to 1/4 the length.
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No. 2
Hem-Fir
Recommended for most general construction uses. Well-spaced knots of any quality are allowable in sizes up to 51 mm, with one hole up to 32 mm in diameter allowable per 61 cm. Wane is allowable, as in piece #1 and #5, up to 1/3 the thickness and 1/3 the width full length, or equivalent on each face, provided that wane not exceed 2/3 the thickness or 1/2 the width for up to 1/4 the length. |
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