Table R301.1 shall be used in determining the applicable requirements from Chapter 4. Locations are assigned a climate zone based on Section R301.3.
CLIMATE ZONES, MOISTURE REGIMES, AND
WARM-HUMID DESIGNATIONS BY COUNTY
Figure R301.1 Climate Zones. Reserved.
|Key: A – Moist |
Asterisk (*) indicates a warm-humid location.
|FLORIDA||2A DeSoto*||2A Highlands*||2A Marion*||2A Santa Rosa*|
|2A Alachua*||2A Dixie*||2A Hillsborough*||2A Martin*||2A Sarasota*|
|2A Baker*||2A Duval*||2A Holmes*||1A Miami-Dade*||2A Seminole*|
|2A Bay*||2A Escambia*||2A Indian River*||1A Monroe*||2A St. Johns*|
|2A Bradford*||2A Flagler*||2A Jackson*||2A Nassau*||2A St. Lucie*|
|2A Brevard*||2A Franklin*||2A Jefferson*||2A Okaloosa*||2A Sumter*|
|1A Broward*||2A Gadsden*||2A Lafayette*||2A Okeechobee*||2A Suwannee*|
|2A Calhoun*||2A Gilchrist*||2A Lake*||2A Orange*||2A Taylor*|
|2A Charlotte*||2A Glades*||1A Lee*||2A Osceola*||2A Union*|
|2A Citrus*||2A Gulf*||2A Leon*||1A Palm Beach*||2A Volusia*|
|2A Clay*||2A Hamilton*||2A Levy*||2A Pasco*||2A Wakulla*|
|1A Collier*||2A Hardee*||2A Liberty*||2A Pinellas*||2A Walton*|
|2A Columbia*||1A Hendry*||2A Madison*||2A Polk*||2A Washington*|
|2A Hernando*||2A Manatee*||2A Putnam*|
The climate zone for any location outside the United States shall be determined by applying Table R301.3(1) and then Table R301.3(2).
INTERNATIONAL CLIMATE ZONE DEFINITIONS
|MAJOR CLIMATE TYPE DEFINITIONS|
|Marine (C) Definition—Locations meeting all four criteria:|
1. Mean temperature of coldest month between -3°C (27°F) and 18°C (65°F).
2. Warmest month mean < 22°C (72°F).
3. At least four months with mean temperatures over 10°C (50°F).
4. Dry season in summer. The month with the heaviest precipitation in the cold season has at least three times as much precipitation as the month with the least precipitation in the rest of the year. The cold season is October through March in the Northern Hemisphere and April through September in the Southern Hemisphere.
|Dry (B) Definition—Locations meeting the following criteria:|
Not marine and Pin < 0.44 × (TF - 19.5) [Pcm < 2.0 × (TC + 7) in SI units]
Pin = Annual precipitation in inches (cm)
T = Annual mean temperature in °F (°C)
|Moist (A) Definition—Locations that are not marine and not dry.|
|Warm-humid Definition—Moist (A) locations where either of the following wet-bulb temperature conditions shall occur during the warmest six consecutive months of the year:|
1. 67°F (19.4°C) or higher for 3,000 or more hours; or
2. 73°F (22.8°C) or higher for 1,500 or more hours.
INTERNATIONAL CLIMATE ZONE DEFINITIONS
|IP Units||SI Units|
|1||9000 < CDD50°F||5000 < CDD10°C|
|2||6300 < CDD50°F ≤ 9000||3500 < CDD10°C ≤ 5000|
|3A and 3B||4500 < CDD50°F ≤ 6300 AND HDD65°F ≤ 5400||2500 < CDD10°C ≤ 3500 AND HDD18°C ≤ 3000|
|4A and 4B||CDD50°F ≤ 4500 AND HDD65°F ≤ 5400||CDD10°C ≤ 2500 AND HDD18°C ≤ 3000|
|3C||HDD65°F ≤ 3600||HDD18°C ≤ 2000|
|4C||3600 < HDD65°F ≤ 5400||2000 < HDD18°C ≤ 3000|
|5||5400 < HDD65°F ≤ 7200||3000 < HDD18°C ≤ 4000|
|6||7200 < HDD65°F ≤ 9000||4000 < HDD18°C ≤ 5000|
|7||9000 < HDD65°F ≤ 12600||5000 < HDD18°C ≤ 7000|
|8||12600 < HDD65°F||7000 < HDD18°C|
R-values referenced in Chapter 4 of this code refer to the R-values of the added insulation only. The R-values of structural building materials such as framing members, concrete blocks or gypsum board shall not be included.
U-factors of fenestration products (windows, doors and skylights) shall be determined in accordance with NFRC 100 by an accredited, independent laboratory, and labeled and certified by the manufacturer. Products lacking such a labeled U-factor shall be assigned a default U-factor from Table R303.1.3(1) or R303.1.3(2). The solar heat gain coefficient (SHGC) and visible transmittance (VT) of glazed fenestration products (windows, glazed doors and skylights) shall be determined in accordance with NFRC 200 by an accredited, independent laboratory, and labeled and certified by the manufacturer. Products lacking such a labeled SHGC or VT shall be assigned a default SHGC or VT from Table R303.1.3(3).
DEFAULT GLAZED FENESTRATION U-FACTOR
|FRAME TYPE||SINGLE |
|Metal with Thermal Break||1.10||0.65||1.90||1.10|
|Nonmetal or Metal Clad||0.95||0.55||1.75||1.05|
DEFAULT DOOR U-FACTORS
|Insulated, nonmetal edge, max 45% glazing, any glazing double pane||0.35|
DEFAULT GLAZED FENESTRATION SHGC AND VT
|SINGLE GLAZED||DOUBLE GLAZED||GLAZED|
Insulation materials shall comply with the requirements of their respective ASTM standard specification and shall be installed in accordance with their respective ASTM installation practice as shown in Table R303.2.1 in such a manner as to achieve rated R-value of insulation. Open-blown or poured loose-fill insulation shall not be used in attic roof spaces when the slope of the ceiling is more than three in twelve. When eave vents are installed, baffling of the vent openings shall be provided to deflect the incoming air above the surface of the insulation.
INSULATION INSTALLATION STANDARDS
|INSULATION MATERIAL||STANDARD SPECIFICATION||INSTALLATION PRACTICE|
|Mineral Fiber Batt/Blanket||ASTM C 665||ASTM C 1320|
|Mineral Fiber Loose Fill||ASTM C 764||ASTM C 1015|
|Cellulose Loose Fill||ASTM C 739||ASTM C 1015|
|Polystyrene Foam||ASTM C 578||—|
|Polyisocyanurate Foam||ASTM C 1289||—|
|Reflective||ASTM C 1224||ASTM C 727|
|Radiant Barrier||ASTM C 1313||ASTM C 1158|
|Vermiculite||ASTM C 516||—|
|Perlite||ASTM C 549||—|
|Spray-Applied Rigid Cellular Polyurethane Foam||ASTM C 1029||—|
|Interior Radiation Control Coating Systems||—||ASTM C 1321|
Insulation that has been compressed to 85 percent or less of the manufacturer’s rated thickness for the product shall use the R-values given in Table 303.2.1.1. These values are to be used except where data developed by an independent testing laboratory is provided.
R-VALUES OF COMPRESSED INSULATION
|% OF ORIGINAL THICKNESS||R-5||R-7||R-11||R-14||R-19||R-30||R-38|
Insulation shall be installed in a permanent manner in substantial contact with the inside surface in accordance with manufacturer’s recommendations for the framing system used. Flexible batt insulation installed in floor cavities shall be supported in a permanent manner by supports no greater than 24 inches (610 mm) on center (o.c.).