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Energy Code Requirements Residential

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 #1
-     The prescriptive insulation requirements for Climate Zone 7 are found in Table N1102.1 and are as follows:

Table N1102.1

Insulation and Fenestration Requirements By Componenta

Climate Zone

Fenestration U-Factor

Skylightb

U-Factor

Ceiling R-Value

Wood Frame Wall

R-Value

Mass Wall

R-Value

Floor

R-Value

Basementc Wall

R-Value

Slabd

R-Value and Depth

Crawl Space c Wall

R-Value

7

0.35

0.60

49e

21

19

30f

10/13

10, 4 ft

10/13

a.  R-values are minimums. U-factors are maximums. R-19 insulation shall be permitted to be compressed into a 2X6 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.  Design Criteria for Manual J

Option #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 on their web site, http://energycode.pnl.gov/REScheckWeb  and submitting the printout and inspection checklist.

Option #3
– Another alternative way to demonstrate compliance is through certification from an approved national, state or local energy efficiency program.