HomeMy WebLinkAboutSTRUCTURAL CALCULATIONS - 19-00186 - Rockhouse Dental - Solar PanelsJAMES A. CLANCY
Installed weight of PV System
PV Module
Weight = 44 lbs
Area = 39” x 65” nominal (17.6 SqFt)
Mounting Rail (Extruded Aluminum)
Weight = 1.03/lf
There are 80” of rail per module = 6.87 lbs
Module + Rail = 50.87 lbs over 17.6 SqFt = 2.89 #/SqFt
Foot spacing is 32” o.c. across panel width with 2 rows per module.
Typical layout provides 13 feet on one rail for each 10 modules in a row.
This provides for an average of 1.3 feet/module/rail x 2 rails = 2.6 feet/module.
Module + Rail weight distributed per mounting foot =
50.87 lbs / 2.6 feet = 19.56 lbs/mtg foot.
Composite Shingle Roofing = 3.8 psf
½” Ext Ply Sheathing = 1 psf
Installed Solar Array = 2.89#/sf (above)
Total load = 7.69 #/sf
IRC- Table R802.5.1(3) Rafter Spans for Common Lumber Species