Energy Codes goes into effect next year
What’s change
For instance, it required that half of new lighting fixtures be hard-wired high-efficacy fixtures (LED or CFLs), and added specific requirement for sealing HVAC ducts as well as the building envelope. ” in the past, code was relatively ambiguous on how to air seal the building envelope. Now it tells you how to seal and where.
The 2012 code will raise insulation levels, set even stricter sealing requirement, to 75% and disallow the use of building plenums to move air from the HVAC system, among many other news requirements.
The Best part is the Building will become more efficient.
The New code would add $4,000 in construction cost, but save over $700 per year in energy cost.
Although homeowners typically spend much more on energy than on property taxes or insurance, few banks include energy cost as a factor in mortgage eligibility.
When the 2012 IECC goes into effect next year, builders in jurisdictions tha adopt it will face following changes.
- the new code requires mandatory building tightness(blower door) testing.
- Blower door test requirements in climate zones 3-8
- Permissible duct leakage to the outdoors has been tightened from 8 cfm per 100 sq.ft of conditioned floorspace to 4 cfm per 100sq.Ft.
- building cavities can no longer be used as supply of return air ducts
- Wall insulation requirement in climate zones 3,4 increase from R-13 to R-20
- Wall insulation for zones 6-8 are now R-20 cavity insulation + R-5foam exterior insulation.
- hot water pipes must be insulated to a minimum of R-3
- Attic insulation zones 4&5 increase from R-38 to R-49
- Basement and crawl space insulation Zone 5 increase from R-10 to R-15
- The requirement for window Solar Heat gain Coefficient in Zone 1-4 is more stringent. this also decrease the amount of daylight that passes throught the window.
- the window U-factor in Zone 2-8 is also more stringent.
- The percentage of high-efficient light fixtures increases from 50% to 75%.
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