Sec. 22-425. Intent.
This article provides three methods for residential and commercial building design/construction to comply with the aircraft noise reduction criteria referenced in Chapter 146, Article 8, of this Code. The methods in this article are for new or remodeled structures that are within the Buckley AFB Noise Impact District (NID), Special Noise Impact District (SNID), Denver International Airport's (DIA) Commercial Airport Noise Areas (CANA), and Noise Impact Boundary Areas (NIBA), residential and commercial areas with the LDN 65 and residential areas within the LDN 55 contours around Centennial Airport and Front Range Airport.
These design/construction methods apply only to the exterior façade elements of a building, not to any interior walls. Compliance is achieved when the outside to inside transmission loss (OITL) meets the minimum levels listed below.
District | Minimum OITL(decibels) |
|---|---|
CANA | 30 |
NIBA | 25 |
SNID | 30 |
NID | 25 |
LDN65(Residential) | 30 |
LDN65(Commercial) | 25 |
LDN55(Residential) | 25 |
Notes:
aCurrent adopted IBC, IRC and IECC Codes—Compliance of a residential structure to the current adopted IBC, IRC and IECC does not ensure compliance with requirements set forth in this article. Conversely compliance with the requirements in this article does ensure compliance with the exterior wall and attic insulation and window R-values required in the current adopted IBC, IRC and IECC.
bThe CANA Subarea is composed of lands that are located within a 60 to 65 LDN noise contour generated by aircraft operations into and out of DIA. Noise level reduction measures are required to any addition or expansion of an existing habitable building or structure when such addition is greater than 1,000 square feet.
cThe NIBA Subarea is composed of lands that are located within the 55 LDN noise contour generated by aircraft operations into and out of DIA. Noise level reduction measures are required to any addition or expansion of an existing habitable building or structure when such addition is greater than 1,000 square feet.
dThe SNID is composed of those areas located between the 60 and 65 noise contours generated by aircraft operations from Buckley AFB. Noise level reduction measures are required to any addition or expansion of an existing habitable building or structure when such addition is greater than 1,000 square feet.
eThe NID is composed of those areas located between the 55 and 60 LDN noise contours generated by aircraft operations from Buckley AFB. Noise level reduction measures are required to any addition or expansion of an existing habitable building or structure when such addition is greater than 1,000 square feet.
fThe LDN 65 Subarea is composed of lands located within the 65 LDN noise contours of Buckley AFB, DIA, Centennial Airport and Front Range Airport. Noise level reduction measures are required to any addition or expansion of an existing habitable (residential) building or structure when such addition is greater than 1,000 square feet. Noise mitigation in this subarea is required in office, commercial or other nonresidential uses where the public is received.
gThe OITL rating method as outlined in ASTM E 1332 uses a reference sound spectrum that accounts for the spectral content of noise from aircraft. Therefore, both methods II and III inherently take into account the low frequency spectral content of jet aircraft noise.
(Ord. No. 2011-07, § 1, 4-11-2011)