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Conversion Tables

Equivalent Glulam Sections For Solid Sawn Beams
Equivalent Glulam Sections for Steel Beams
Equivalent Glulam Sections for LVL Beams
Key Specs of Conversion Charts

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

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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

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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

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Key Specs of Conversion Charts Above:
Roof beam sections are compared on the basis of equivalent bending resistance only. These sizes assume a dry condition of use and a 1.15 increase for duration of 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, modified by the AITC volume effect factor, was used.
Floor beam sections are compared on the basis of 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. For determining glulam floor beam sections, an MOE value of 1,800,000 psi was used.
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 and 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

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

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

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