HomeMy WebLinkAboutPermit Correspondence 2007-7-30
07/30/2007 07:39 5414846859
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Residential Structural Design and Drafting Sen~ices .
685 Wimn Strr!<< 1845 Hwy. 1,26, Sui12 A7
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Office: (541) 687-'817 Office: (.541) 997.;.&000
Cell: (541) Su..33S4 CcD:(S41) 2Q6..13sO
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July 25, 2007
re: COM2007-0791
The floor. beams specified .for this project were specified at 32" on center,. When
installed, it was impradical to install the .Iast beam on the west side of the .new
portion of structure because there was insufficient room to do so.
There is a maximum of 38" between the centerline of the last beam installed and a
point 2-3/4" onto the mudsill. If 1-1/8" decking rated for a 48" spain is inStalled, the
beam support is more than sufficient for that.
The piers are spaced at 8 feet on center. If the loading (live and dead) is
calculated as being % of the 38" (19") on one side ofthe.beam, and 16" on the
other side, to be conservative we can calculate the loading as .3 feet of trib. area x
8 feet of trib. area x (40# live. load + 1.2# dead load) which is 24 x 52 ~ 1248
pounds of loading on the pier.
Assuming a .ground bearing value of 1000#/sq_ ft., that means a total of 21.2 sq.
inches of bearing must be available for the loading at this pier.
The total available for that pier is 256 sq. in., so the pier support is sufficient for
the loading also.
I find no problem with the way the floor .support sys.tem has been i1nstalled, e"en
though it was not installed speCifically as designed,
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Karl R. Stoner, Stoner Design
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