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Miami 21 Code in effect May 20, 2010

Final Approved Heat island Code Approved by the City of Miami

3.13.2 Heat Island Effect
The intent of this section is to reduce the heat island effect in the City of Miami and to
consequently reduce energy consumption and bills for buildings within the City.
a. Applicability
In all Transect Zones, except T3, the provisions of this section are applicable to all
new construction and to repair or replacement greater than fifty percent (50%) by
area of existing roofs or site Hardscape. All repairs or replacement of existing
roofing or Hardscape shall be reviewed by the Zoning Department for compliance
with this section. The following portions of new or existing roofs are exempted from
the requirements of section 3.13.2:
1. The portion of the roof acting as a substructure for and covered by a rooftop
deck, vegetation associated with an extensive or intensive green roof as defined
by the U.S. Environmental Protection Agency, or any area of a roof utilized by
photovoltaic and solar equipment.
2. A rooftop deck covering a maximum of 1/3 of the rooftop total gross area.
3. Existing roofs where less than fifty percent (50%) of existing roof area is repaired
or replaced are exempt from the requirements of 3.13.2.c.
MIAMI 21 ARTICLE 3. GENERAL TO ZONES
AS ADOPTED MAY 2010
III.26
4. Existing Hardscapes where less than fifty percent (50%) of existing Hardscape
area is being repaired or replaced are exempt from the requirements of 3.13.2.d.
b. Solar Reflectance
1. For roofing materials, all roof exterior surfaces and building materials used to
comply with this section, shall have a minimum Solar Reflectance as specified in
sections 3.13.2.c and 3.13.2.d when (i) tested in accordance with ASTM E903 or
ASTM E1918, (ii) tested with a portable reflectometer at near ambient conditions,
(iii) labeled by the Cool Roof Rating Council, or (iv) labeled as an Energy Star
qualified roof product. Any product that has been rated by the Cool Roof Rating
Council or by Energy Star shall display a label verifying the rating of the product.
2. For paving materials, all paving materials used to comply with this section shall
have a minimum solar reflectance as specified in sections 3.13.2.d when (i)
tested in accordance with ASTM E903 or ASTM E1918, (ii) tested with a portable
reflectometer at near ambient conditions, or (iii) default values of Solar
Reflectance for listed materials may be used as follows:
Material Solar Reflectance
Typical new gray concrete 0.35
Typical weathered gray concrete 0.20
Typical new white concrete 0.40
Typical weathered white concrete 0.40
New asphalt 0.05
Weathered asphalt 0.10
c. Roof
1. Requirements for Low Sloped Roofs
Roofing materials used in roofs with slopes of a rise of zero (0) units in a
horizontal length (0:12 pitch) up to and including roofs with slopes of a rise of two
(2) units in a horizontal length of 12 units (2:12 units) ("low-sloped") shall meet
the following requirements:
a. Low-sloped roofs constructed as part of a new building shall utilize roofing
products that meet or exceed an initial reflectance value of 0.72 or a threeyear
installed reflectance value of 0.5 as determined by the Cool Roof Rating
Council or by Energy Star.
b. Exception. Where more than 50% of the total gross area of the low-sloped
roof is covered with vegetation associated with an extensive or intensive
green roof as defined by the US EPA, the remainder of the roof shall have a
reflectance value of a minimum of 0.30 and the rooftop deck exception in
section 3.13.2.a.1 applies.
c. Exception. Ballasted roofs with a minimum of 15 lbs/sq. ft. or ballast over the
entire roof surface may have a reflectance value of a minimum of 0.30. For
MIAMI 21 ARTICLE 3. GENERAL TO ZONES
AS ADOPTED MAY 2010
III.27
the purposes of this section, "ballast" shall mean river rock aggregate or
larger, pavers or other means of weighing down a roofing membrane over a
substrate to resist wind uplift.
2. Requirements for Steep Sloped Roofs
Roofing materials used in roofs with slopes of a rise greater than two (2) units in a
horizontal length (2:12 pitch) ("steep-sloped") shall meet the following
requirements:
a. Steep sloped roofs shall have an initial Solar Reflectance of 0.15 or greater.
3. Requirements for Roofs with Multiple Slopes
Roofs with multiple slopes shall be subject to those requirements applicable to the
slope which covers the largest area of the building footprint.
d. Non-roof Requirements
1. Provide any combination of the following strategies for fifty percent (50%) of the
site Hardscape:
a. Shade from solar panels or roofing materials with a Solar Reflectance of at
least 0.30.
b. Shade from trees within five (5) years of occupancy.
c. Paving materials with a Solar Reflectance of at least 0.30.
d. Pervious Pavement System.
OR
2. Place a minimum of fifty-percent (50%) of parking spaces under cover (defined
as underground, under deck, under roof, or under building). Any roof used to
shade or cover parking must have a Solar Reflectance of at least 0.30.
3.14 PUBLIC