Residential Energy Code Information
Residential Energy Efficiency Requirements
All new residential construction must comply with the provisions in Chapter 11 of the 2009 International Residential Code and the 2009 International Energy Conservation Code as adopted and amended by Clear Creek County. Due to our higher elevations and colder winters, our county is designated as Climate Zone 7. Any of the following three options may be used to design the new residence to be in compliance with this Code.
Option Number 1 - The prescriptive insulation requirements for Climate Zone 7 are found in Table N1102.1 and are as follows:
Insulation and Fenestration Requirements By Componenta
|Climate Zone||Fenestration U-Factor||Skylightb|
|Wood Frame Wall|
R-Value and Depth
|Crawl Space c Wall|
|7||0.35||0.60||49e||21||19||30f||10/13||10, 4 feet||10/13|
a. R-values are minimums. U-factors are maximums. R-19 insulation shall be permitted to be compressed into a 2 by 6 cavity
b. The fenestration U-factor column excludes skylights.
c. The first R-value applies to continuous insulation, the second to framing cavity insulation; either insulation meets the requirement.
d. R-5 shall be added to the required slab edge R-values for heated slabs.
e. R-38 is permitted when the full height of uncompressed R-38 insulation extends over the wall top plate at the eaves.
f. Or insulation sufficient to fill the framing cavity, minimum R19.
Efficient Heating Unit and Duct Sizing - In order to ensure that the heating unit and ducts are sized correctly, Manual J and Manual D calculations are required to be submitted. As an alternative to the Manual J calculations, a high-efficiency furnace or boiler can be chosen for the residence, and information on the appliance will need to be submitted. Manual J Design Requirements
Option Number 2 - As an alternative, compliance may also be demonstrated by using the calculation program known as REScheck, provided by the Department of Energy's Model Energy Code website, and submitting the printout and inspection checklist.
Option Number 3 – Another alternative way to demonstrate compliance is through certification from an approved national, state or local energy efficiency program.