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Old 11-01-2017, 12:33 PM   #12
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Join Date: Dec 2015
Location: Berkeley, CA
Posts: 893
Hi Steve,

Regarding the double member, my initial concerns are abated. Briefly, the common joists have a tributary width of 16" (assuming 16" o.c.). With a six foot span to the foundation wall, the double member has a tributary width of 44" (half of 6' plus half of 16"). So it is carrying 2.75 times the load of a common joist.

As such, my initial impression was that it should be triple a common joist. But since it is composed of engineered full dimension members, each member definitely has a higher capacity that the common joists. Plus the common joists may not be loaded to full capacity. Therefore, it seems likely that the double member has adequate capacity.

Cheers, Wayne
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