Building Homes or Extensions/structure weight

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Expert: - 10/26/2009


Question
I have built a ceiling in a new office and would like to know the weight capacity allowed to store things.11'x11' square office 2x6 walls 2x8 ceiling joist on 16" centers 3/4 plywood decking.

Answer
Curtis, there are still a few variables.  Let's look at the span table here:
http://www.awc.org/calculators/span/reversecalc/reversecalc.asp?feet=11&inches=0...

The type and grade of lumber matters - I used Southern Yellow Pine.  This table assumes a uniformly distributed load (you've got junk all over, not just at one point in the middle of the floor).   I allowed the joists to sag L/360 - about 3/8" at mid point - this amount is normal and meets code.

Using this information, we get very comfortable at 60 lbs per square foot which gets to 7,260 pounds.  I hope this answers ;your question.

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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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