Equivalent Glulam Sections For Solid Sawn Beams
| Sawn Section Normal Size | Roof Beams Select Structural | Roof Beams No. 1 | Floor Beams |
| 3 x 8 | 3-1/8 x 6 | 3-1/8 x 6 | 3-1/8 x 7-1/2 |
| 3 x 10 | 3-1/8 x 7-1/2 | 3-1/8 x 6 | 3-1/8 x 9 |
| 3 x 12 | 3-1/8 x 9 | 3-1/8 x 7-1/2 | 3-1/8 x 12 |
| 3 x 14 | 3-1/8 x 10-1/2 | 3-1/8 x 9 | 3-1/8 x 13-1/2 |
| 4 x 6 | 3-1/8 x 6 | 3-1/8 x 6 | 3-1/8 x 6 |
| 4 x 8 | 3-1/8 x 6 | 3-1/8 x 6 | 3-1/8 x 9 |
| 4 x 10 | 3-1/8 x 9 | 3-1/8 x 7-1/2 | 3-1/8 x 10-1/2 |
| 4 x 12 | 3-1/8 x 10-1/2 | 3-1/8 x 9 | 3-1/8 x 12 |
| 4 x 14 | 3-1/8 x 12 | 3-1/8 x 10-1/2 | 3-1/8 x 13-1/2 |
| 4 x 16 | 3-1/8 x 13-1/2 | 3-1/8 x 12 | 3-1/8 x 6 |
| 6 x 8 | 5-1/8 x 7-1/2 | 5-1/8 x 7-1/2 | 5-1/8 x 9 |
| 6 x 10 | 5-1/8 x 9 | 5-18 x 7-1/2 | 5-1/8 x 10-1/2 |
| 6 x 12 | 5-1/8 x 10-1/2 | 5-1/8 x 9 | 5-1/8 x 12 |
| 6 x 14 | 5-1/8 x 12 | 5-1/8 x 10-1/2 | 5-1/8 x 13-1/2 |
| 6 x 16 | 5-1/8 x 13-1/2 | 5-1/8 x 12 | 5-1/8 x 16-1/2 |
| 6 x 18 | 5-1/8 x 15 | 5-1/8 x 13-1/2 | 5-1/8 x 18 |
| 6 x 20 | 5-1/8 x 18 | 5-1/8 x 16-1/2 | 5-1/8 x 19-1/2 |
| 8 x 10 | 6-3/4 x 9 | 6-3/4 x 9 | 6-3/4 x 10-1/2 |
| 8 x 12 | 6-3/4 x 10-1/2 | 6-3/4 x 10-1/2 | 6-3/4 x 12 |
| 8 x 14 | 6-3/4 x 12 | 6-3/4 x 12 | 6-3/4 x 13-1/2 |
| 8 x 16 | 6-3/4 x 13-1/2 | 6-3/4 x 13-1/2 | 6-3/4 x 16-1/2 |
| 8 x 18 | 6-3/4 x 16-1/2 | 6-3/4 x 15 | 6-3/4 x 18 |
| 8 x 20 | 6-3/4 x 18 | 6-3/4 x 16-1/2 | 6-3/4 x 19-1/2 |
| 8 x 22 | 6-3/4 x 19-1/2 | 6-3/4 x 18 | 6-3/4 x 22-1/2 |
Key Specs of Conversion Charts Above:
Roof beam sections are compared based on equivalent bending resistance only. These sizes assume a dry condition of use and a 1.15 increase for the duration of the load (as for snow loading)
as applicable to wood members, sizes shown should also be checked for shear, deflection, and other applicable strength properties and design considerations. An Fb value of 2400 psi, modified by the AITC volume effect factor, was used to determine glulam roof beam sections. 
Solid-sawn sections are based on the assumption of using either a select structural or No. 1 visual grade having the following assumed design values:
Members 2 to 4 inches thick and 5 inches wider:
| Select Structural | Fb=1450 psi | MOE=1,900,000 |
| No.1 | Fb=1000 psi | MOE=1,700,000 |
Members having a least dimension of 5 inches or greater:
| Select structural | Fb=1600 psi | MOE=1,600,00 |
| No. 1 | Fb=1350 psi | MOE=1,600,000 |
Equivalent Glulam Sections for Steel Beams:
| Steel Section | Roof Beams | Floor Beams | ||
| W 6 x 9 | 3-1/8 x 10-1/2 or 5-1/8 x 9 | 3-1/8 x 10-1/2 or 5-1/8 x 9 | ||
| W 8 x 10 | 3-1/8 x 12 | or 5-1/8 x 9 | 3-1/8 x 13-1/2 | or 5-1/8 x 12 |
| W 12 x 14 | 3-1/8 x 16-1/2 or 5-1/8 x 13-1/2 | 3-1/8 x 18 | or 5-1/8 x 15 | |
| W 12 x 16 | 3-1/8 x 18 | or 5-a1/8 x 13-1/2 3-1/8 x 19-1/2 | or 5-1/8 x16-1/2 | |
| W 12 x 19 | 3-1/8 x 19-1/2 or 5-1/8 x16-1/2 | 3-1/8 x 21 | or 5-1/8 x18 | |
| W 10 x 22 | 3-1/8 x 21 | or 5-1/8 x 16-1/2 | 3-1/8 x 19-1/2 | or 5-1/8 x16-1/2 |
| W 12 x 22 | 5-1/8 x 18 | or 6-3/4 x 15 | 5-1/8 x 19-1/2 or 6-3/4 x 16-1/2 | |
| W 14 x 22 | 5-1/8 x 18 | or 6-3/4 x 16-1/2 | 5-1/8 x 21 | or 6-3/4 x 18 |
| W 12 x 26 | 5-1/8 x 19-1/2 or 6-3/4 x 18 | 5-1/8 x 21 | or 6-3/4 x 19-1/2 | |
| W 14 x 26 | 5-1/8 x 21 | or 6-3/4 x 18 | 5-1/8 x 21 | or 6-3/4 x 19-1/2 |
| W 16 x 26 | 5-1/8 x 21 | or 6-3/4 x 19-1/2 | 5-1/8 x 22-1/2 | or 6-3/4 x 21 |
| W 12 x 30 | 5-1/8 x 21 | or 6-3/4 x 19-1/2 | 5-1/8 x 21 | or 6-3/4 x 19-1/2 |
| W 14 x 30 | 5-1/8 x 22-1/2 or 6-3/4 x 19-1/2 | 5-1/8 x 22-1/2 | or 6-3/4 x 21 | |
| W 16 x 31 | 5-1/8 x 24 | or 6-3/4 x 21 | 5-1/8 x 25-1/2 | or 6-3/4 x 22-1/2 |
| W 14 x 34 | 5-1/8 x 24 | or 6-3/4 x 21 | 5-1/8 x 24 | or 6-3/4 x 22-1/2 |
| W 18 x 35 | 5-1/8 x 27 | or 6-3/4 x 24 | 5-1/8 x 27 | or 6-3/4 x 25-1/2 |
| W 16 x 40 | 5-1/8 x 28-1/2 or 6-3/4 x 25-1/2 | 5-1/8 x 27 | or 6-3/4 x 25-1/2 | |
| W 21 x 44 | 5-1/8 x 33 | or 6-3/4 x 28-1/2 | 5-1/8 x 33 | or 6-3/4 x 30 |
| W 18 x 50 | 5-1/8 x 34-1/2 or 6-3/4 x 30 | 5-1/8 x 31-1/2 | or 6-3/4 x 26-1/2 | |
| W 21 x 50 | 5-1/8 x 34-1/2 or 6-3/4 x 31-1/2 | 5-1/8 x 34-1/2 | or 6-3/4 x 31-1/2 | |
| W 18 x 55 | —————- | or 6-3/4 x 31-1/2 | ————— | or 6-3/4 x 30 |
| W 21 x 62 | —————- | or 6-3/4 x 36 | ————— | or 6-3/4 x 34-1/2 |
Key Specs of Conversion Charts Above:
Roof beam sections are compared based on equivalent bending resistance only. These sizes assume a dry condition of use and a 1.15 increase for the duration of the load (as for snow loading) as applicable to wood members. Sizes shown should also be checked for shear, deflection, and other applicable strength properties and design considerations. An Fb value of 2400 psi, modified by the AITC volume effect factor, was used to determine glulam roof beam sections.
Floor beam sections are compared based on equivalent stiffness (E1) only, assuming a dry condition of use for the wood members. Sizes shown should also be checked for shear, bending, and other applicable strength properties and design considerations. A MOE value of 1,800,000 psi was used to determine glulam floor beam sections.
Steel sections were selected as the most economical from the “Manual of Steel Construction,” AISC, 8th Edition. Design values used for conversion were:
| Fy=36 ksi | Fb=0.66 x Fy | MOE=29,000 ksi |
Equivalent Glulam Sections for LVL Beams:
| LVL Section | Roof Beams | Floor Beams | ||
| 2 pcs. 1-3/4 x9-1/2 | 3-1/8 x 12 | or 5-1/8 x 9 | 3-1/8 x 10-1/2 | or 5-1/8 x 9 |
| 2 pcs. 1-3/4 x 11-7/8 3-1/8 x 15 | or 5-1/8 x 12 | 3-1/8 x 13-1/2 | or 5-1/8 x 12 | |
| 2 pcs. 1-3/4 x 14 | 3-1/8 x 16-1/2 | or 5-1/8 x 13-1/2 | 3-1/8 x 16-1/2 | or 5-1/8 x 13-1/2 |
| 2 pcs. 1-3/4 x 16 | 3-1/8 x 19-1/2 | or 5-1/8 x 15 | 3-1/8 x 18 | or 5-1/8 x 15 |
| 2 pcs. 1-3/4 x 18 | 3-1/8 x 21 | or 5-1/8 x 16-1/2 | 3-1/8 x 19-1/2 | or 5-1/8 x 16-1/2 |
| 3 pcs. 1-3/4 x 9-1/2 | 3-1/8 x 21 | or 5-1/8 x 10-1/2 | 3-1/8 x 12 | or 5-1/8 x 10-1/2 |
| 3 pcs. 1-3/4 x 11-7/8 5-1/8 x 18 | or 5-1/8 x 13-1/2 | 3-1/8 x 15 | or 5-1/8 x 13-1/2 | |
| 3 pcs. 1-3/4 x 14 | 5-1/8 x 18 | or 6-3/4 x 16-1/2 | 3-1/8 x 18 | or 5-1/8 x 15 |
| 3 pcs. 1-3/4 x 16 | 5-1/8 x 19-1/2 | or 6-3/4 x 16-1/2 | 5-1/8 x 18 | or 5-1/8 x 18 |
| 3 pcs. 1-3/4 x 18 | 5-1/8 x 21 | or 6-3/4 x 18 | 5-1/8 x 19-1/2 | or 6-3/4 x 18 |
Key Specs of Conversion Charts Above:
Roof beam sections are compared based on equivalent bending resistance only. These sizes assume a dry condition of use and a 1.15 increase for duration of the load (as for snow loading) as applicable to wood members. Sizes shown should also be checked for shear, deflection, and other applicable strength properties and design considerations. For determining glulam roof beam sections, an Fb value of 2400 psi was modified by the AITC volume effect factor.
Floor beam sections are compared based on equivalent stiffness (E1) only, assuming a dry condition of use for the wood members. Sizes shown should also be checked for shear, bending, and other applicable strength properties and design considerations. A MOE value of 1,800,000 psi was used to determine glulam floor beam sections.
LVL sections are based on the following assumed design values:
| Fb=3200 psi (adjusted for Cy=(12/d)1/6 for depths greater than 12 inches.) | MOE=2,000,000 PSI |
