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HomeMy WebLinkAboutRESIDENTIAL ENERGY EFFICIENCYRESIDENTIAL ENERGY EFFICIENCY glazed shall be permitted to satisfy the SHGC require- ments. R402.3.3 Glazed fenestration exemption. Up to 15 square feet (1.4 m=) of glazed fenestration per dwelling unit shall be permitted to be exempt from U-factor and SHGC requirements in Section R402.1.1. This exemption shall not apply to the U-factor alternative approach in Sec- tion R402.1.3 and the Total UA alternative in Section R402.1.4. R402.3.4 Opaque door exemption. One side -hinged opaque door assembly up to 24 square feet (2.22 m') in area is exempted from the U-factor requirement in Section R402.1.1. This exemption shall not apply to the U-factor alternative approach in Section R402.1.3 and the total UA alternative in Section R402.1.4. R402.3.5 Sunroom U-factor. All sunrooms enclosing conditioned space shall meet the fenestration requirements of this code. Exception: For sunrooms with thermal isolation and enclosing conditioned space, in Climate Zones 4 through 8, the following exceptions to the fenestration requirements of this code shall apply: 1. The maximum fenestration U-factor shall be 0.45; and 2. The maximum skylight U-factor shall be 0.70. New fenestration separating the sunroom with thermal isolation from conditioned space shall meet the building thermal envelope requirements —of this code. _ R402.3.6 ReplaZeme-iiFfenestration. Where some or all of an existing fenestration unit is replaced with a new fen- estration product, including sash and glazing, the replace- ment fenestration unit shall meet the applicable require- ments for U-factor and SHGC in TabW R402.1.1. -- / IR402,4 YPI at�cage an atory). The building thermal envelope shall be constructed to limit air leakage in accor- dance with the requirements of Sections R402.4.1 through R402.4.4. R402.4.1 Building thermal envelope. The building ther- mal envelope shall comply with Sections R402.4.1.1 and R402.4.1.2. The sealing methods between dissimilar mate- rials shall allow for differential expansion and contraction. R402.4.1.1 Installation. The components of the build- ing thermal envelope as listed in Table R402.4.1.1 shall be installed in accordance with the manufacturer's instructions and the criteria listed in Table R402.4.1.1, as applicable to the method of construction. Where required by the code official, an approved third party shall inspect all components and verify compliance. R402.4.1.2 Testing. The building or dwelling unit shall be tested and verified as having an air leakage rate of not exceeding 5 air changes per hour in Climate Zones 1 and 2, and 3 air changes per hour in Climate Zones 3 through 8. Testing shall be conducted with a blower door at a pressure of 0.2 inches w.g. (50 Pascals). Where required by the code official, testing shall be SCANNED BY St Lucie Countv conducted by an approved third party. A written report of the results of the test shall be signed by the party conducting the test and provided to the code official. Testing shall be performed at any time after creation of all penetrations of the building thermal envelope. During testing: 1. Exterior windows and doors, fireplace and stove doors shall be closed, but not sealed, beyond the intended weatherstripping or other infiltration control measures; 2. Dampers including exhaust, intake, makeup air, backdraft and flue dampers shall be closed, but not sealed beyond intended infiltration control measures; 3. Interior doors, if installed at the time of the test, shall be open; 4. Exterior doors for continuous ventilation systems and heat recovery ventilators shall be closed and sealed; 5. Heating and cooling systems, if installed at the time of the test, shall be turned off; and 6. Supply and return registers, if installed at the time of the test, shall be fiilly open. R402.4.2 Fireplaces. New wood -burning fireplaces shall have tight -fitting flue dampers and outdoor combustion air. R402.4.3 Fenestration air leakage. Windows, skylights and sliding glass doors shall have an air infiltration rate of no more than 0.3 cfn per square foot (1.5 Us/m'), and swinging doors no more than 0.5 cfm per square foot (2.6 Us/m'), when tested according to NFRC 400 or AAMA/ WDMA/CSA 101/I.S.2/A440 by an accredited, indepen- dent laboratory and listed and labeled by the manufac- turer. Exception: Site -built windows, skylights and doors. R402.4.4 Recessed lighting. Recessed luminaires installed in the building thermal envelope shall be sealed to limit air leakage between conditioned and unconditioned spaces. All recessed luminaires shall be IC -rated and labeled as having an air leakage rate not more than 2.0 efin (0.944 Us) when tested in accordance with ASTM E 283 at a 1.57 psf (75 Pa) pressure differential. All recessed luminaires shall be sealed with a gasket or caulk between the housing and the interior wall or ceiling covering. SECTION R403 SYSTEMS R403.1 Controls. R403.1.1 Thermostat provision (Mandatory). At least one thermostat shall be provided for each separate heating and cooling system. R403.1.2 Programmable thermostat (Prescriptive). Where the primary heating system is a forced -air furnace, at least one thermostat per dwelling unit shall be capable of controlling the heating and cooling system on a daily R-4.4 FLORIDA BUILDING CODE — ENERGY CONSERVATION, 5th EDITION (2014) MuIlk l 1 I 1 " ' Copyright to, or licensed by, ICC (ALL RIGHTS RESERVED); accessed by Beatrice Goycochea on May 22, 2015 7:36:14 AM pursuant to License Agreement. No fuller reproductions authorized.