CLIMATE ZONES, MOISTURE REGIMES, AND WARM-HUMID DESIGNATIONS BY COUNTY
|Key: A — Moist|
|Asterisk (*) indicates a warm-humid location.|
|2A Indian River*|
|1A Palm Beach*|
|2A Santa Rosa*|
|2A St. Johns*|
|2A St. Lucie*|
INTERNATIONAL CLIMATE ZONE DEFINITIONS
|MAJOR CLIMATE TYPE DEFINITIONS|
|Marine (C) Definition—Locations meeting all four criteria: |
|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: |
For SI: °C = [(°F) - 32]/1.8, 1 inch = 2.54 cm.
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|
For SI: °C = [(°F) - 32]/1.8.
U-factors of fenestration products shall be determined as follows:
Products lacking such a labeled U-factor shall be assigned a default U-factor from Table C303.1.3(1) or C303.1.3(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 C303.1.3(3).
DEFAULT GLAZED FENESTRATION U-FACTORS
|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 OPAQUE DOOR U-FACTORS
|Insulated Metal (Rolling)||0.90|
|Insulated Metal (Other)||0.60|
|Insulated, nonmetal edge, max 45% glazing, |
any glazing double pane
R-values for building materials used to demonstrate code compliance with Chapter C4 shall be taken from ASHRAE 90.1 Normative Appendix A, from manufacturer's product literature or from other nationally recognized engineering sources. Assembly U-factor calculations shall follow the procedure(s) detailed in Section C304.3 or be tested in accordance with procedure(s) described in Section C304.2.
Concrete block R-values shall be calculated using the isothermal planes method or a two-dimensional calculation program, thermal conductivities from ASHRAE 90.1 Normative Appendix A and dimensions from ASTM C90. The parallel path calculation method is not acceptable.
Exception: R-values for building materials or thermal conductivities determined from testing in accordance with Section C304.2.
If building material R-values or thermal conductivities are determined by testing, one of the following test procedures shall be used:
For concrete, the oven-dried conductivity shall be multiplied by 1.2 to reflect the moisture content as typically installed.
If the building official determines that the proposed construction assembly is not adequately represented in the appropriate table of ASHRAE 90.1 Normative Appendix A, the applicant shall determine appropriate values for the assembly using the assumptions in ASHRAE 90.1 Normative Appendix A. An assembly is deemed to be adequately represented if:
Insulation, including insulated sheathing, is not considered a building material.