Building Homes or Extensions/floor load ratings

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Expert: - 10/21/2008


Question
What is the dead, live and concentrated load ratings for a raised floor constructed of 3/4" 5-ply plywood decking layed on 2" x 4" No. 2 Hem Fir joists. The maximum span at any given point is <5feet.

Answer
Tim, this is a strange way to approach the question.  I like the span calculator here:
http://www.awc.org/calculators/span/calc/timbercalcstyle.asp?species=Hem-Fir&siz...
which will take you to a solution that works for your scenario.  I used the choice of 16" centers for the joists which will give 60 lb/SF.  By increasing to 12" centers, this loading can go  to 80.

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Dan Griffin

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I can answer almost all questions related to the total construction process. My expertise is in commercial construction, though I can field most any residential question. I have hands on experience in concrete, heavy equipment, masonry, all phases of carpentry, interior finishes, and I am fairly strong in mechanical and electrical.

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I have over 20 years experience as a commercial carpenter and commercial construction superintendent. I have another 20 years experience in facility management for a major school district.

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My favorite hobby for he past 12 years has been singing bass in a The OkChorale men's barbershop chorus and the Mature Moments quartet.

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I hold a Bachelor's degree in English and Math. I have completed many continuing education hours in the building trades. I hold a Master Carpenter card from the AGC, Associated General Contractors.

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