Structural Joists & Planks

Select Structural
Douglas Fir

In Select Structural grade knots are limited to sound, firm, encased and pith knots, if tight and well spaced, with one unsound or loose knot _or hole per 1.2 metres. Centerline knots range from 38 mm on 114 mm widths to 83 mm on 337 to 343 mm widths. Edge knots range from maximums of 25 mm on 114 mm widths to 60 mm on widest. Unsound loose knots or holes range from maximum of 22 mm on 114 mm widths to 32 mm on the wide widths, one per 1.2 metres. 

No. 1
Douglas Fir

Centerline knots range from maximums of 48 mm on 114 mm widths to 102 mm on 337 to 343 mm widths. Edge knots range from maximums of 32 mm on 114 mm widths to 79 mm on widest widths. Unsound loose knots or holes range from maximum of 29 mm on 114 mm widths to 38 mm on the wide widths. Restrictions on wane for this grade described for Hem-Fir example.

No. 2
Douglas Fir

Recommended for most general construction purposes. Well-spaced knots of any quality are allowable. Centerline knots range from maximums of 60 mm on 114 mm widths to 133 on wide widths. Edge knots range from maximums of 41 mm to 105 mm. Holes from any cause range from maximums of 35 mm on 114 mm widths to 89 mm on wide widths, one per 610 mm. 

Select Structural
Hem-Fir

Knots are limited to sound, firm, encased and pith knots, if tight and well spaced, with one unsound or loose knot or hole per 1.2 metres. Restrictions on centerline, edge, unsound loose knots or holes are described for Douglas Fir. Wane is allowed 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.

No. 1
Hem-Fir

Restrictions on centerline, edge, unsound loose knots or holes described in Douglas Fir example for No. 1 grade. Wane is allowed _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.

No. 2
Hem-Fir

Recommended for most general construction purposes. Well-spaced knots of any quality are allowable. Resrictions on centerline, edge and unsound loose knots or holes apply. Wane is allowed 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.