Design Criteria


Type
Requirements
Multifamily and Commercial
Design per IBC 2012
One and Two Family Dwellings
Design per IRC 2012
Seismic Zone
Residential: "A"
Multi-Family and Commercial: use Code Central
Seismic Design Parameters version 3.10
Wind Load
(3-second gust in miles per hour)
Risk Category I: 105 MPH
Risk Category II: 115 MPH
Risk Category III-IV: 120 MPH
Foundation Depth
36 in. frost depth - to top of footings
Roof Snow Load
Minimum design roof snow load after allowed reductions
shall be 30 psf (i.e. Pf = 30 psf)
For drift / unbalanced loading: Pg = 33

International Energy Conservation Code 2012 (IECC)

Structure
Default Values
Ceilings
R - 49
Walls
R - 21 or R - 13 + 5 Continuous
Floor over unheated space
R - 30
Crawl Space walls
R - 15 - Continuous

R - 19 - Framed
Basement walls
R - 15 - Continuous

R - 19 - Framed
Windows
U - 0.32