Design Information

 2009 IECC Compliance and Design Criteria for Homes in Douglas County

New residential; construction, additions, alterations, renovations or repairs shall comply with one of the following three paths for energy conservation:

  • Prescriptive
  • Alternative
  • Performance

A permanent certificate provided by the builder, shall be posted in the room where the mechanical equipment is housed. The certificate shall list the R-values of  insulation used in the walls, ceiling, floor, foundation and ducts along with the U-factors of the windows. The certificate shall list the type and efficiency of the heating, cooling and service water heating equipment installed.

Obtain additional detailed information about ResCheck and ComCheck analysis and Energy Codes from the US Department of Energy

Colorado Office of Energy Management and Conservation has a great website with short videos that explain energy compliant materials and practices Energy Compliance and Practices.

**All International Code Books can be purchased at any major bookstore, online at the International Code Council website or viewed at your local library.**

Design Criteria for Douglas County Building Division

Wind Speeds under the 2012 IRC

  • 90 mph 3 second gust exposure “C” for elevations less than 7000 ft. U.S.G.S.
  • 100 mph 3 second gust exposure “C” for elevations 7000 ft. and above U.S.G.S.

Wind Speeds under the 2012 IBC

  • Category I – 105 mph Ultimate Design Wind Speed  exposure “C”
  • Category II – 115 mph Ultimate Design Wind Speed  exposure “C”
  • Category III and IV – 120 mph Ultimate Design Wind Speed  exposure “C”

Seismic:
Site Class – B

Foundation Standard: ACI 318 Foundation walls over four feet in height shall have deformed bars not smaller than No. 4 in size with a specified yield strength of not less than 60,000 psi placed both vertically and horizontally with a maximum spacing of 18 inches.Foundation walls four feet in height or less shall have two horizontal deformed bars both top and bottom as specified in the following paragraph.All walls shall have two bars not smaller than No. 5 in size with a specified yield strength of not less than 60,000 psi placed horizontally at the top and bottom of the wall.

Frost Depth: Minimum 36 inches below finished grade

Snow Loads are determined according to elevation:

ELEVATION RANGES
(Feet)
SNOW LOAD
(PSF)
5152 – 5999
30
6000 – 6499
35
6500 – 6999
40
7000 – 7499
45
7500 – 7999
50
8000 – 8499
55
8500 – 8999
60
9000 – 9499
65
>=9500
70

* Ground Snow Load = Roof Snow Load, reductions for Snow Loads are not allowed.


Map

Resources

  •  2009 IECC Handout  – New residential; construction, additions, alterations, renovations or repairs shall comply with one of the following three paths for energy conservation: Prescriptive, Alternative or Performance.
  • Fireplace Standards