Beam strength


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Old 03-30-06, 06:55 AM
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Beam strength

Does anyone know how does the strenth and weight-bearing properties of a single 4x6 beam compare with a beam made by laminating two 2x6's together using construction adhesive and deck screws? I recall seeing some reference suggesting that the 2x6's were as strong if not stronger than a 4x6. Is this accurate?

Thanks.
 
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Old 03-30-06, 01:07 PM
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According to Western Wood Products Association Span Tables, a #2 4 x 6 of 8 ft span will support 246 lbs per lineal ft, while a beam of doubled 2 x 6 (again #2 grade, and secured by their fastening schedule) will support 212 lbs per lineal ft. Wish I could find a table that also gave load capacity for doubled 2 x beams sandwiched with 1/2 inch plywood, I'm told that really boosts the capacity.

Only way a plain double 2 x 6 exceeds the capacity of a 4 x 6 is if the 4 x 6 is #2 grade, and the doubled 2 x 6s are graded #1 or Better, or Select Structural.
 

Last edited by Scott Crownover; 03-30-06 at 01:20 PM.
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Old 03-30-06, 04:01 PM
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Thanks for your help. I'll check out that resource.
 
 

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