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CHAPTER 4 RESIDENTIAL ENERGY EFFICIENCY

CHAPTER 4 RESIDENTIAL ENERGY EFFICIENCYSECTION CHAPTER applies to RESIDENTIAL shall comply with Sections 401, , , and , , , and (referred to as the mandatory provisions) and either:1. Sections through , and (pre-scriptive); or2. Section 405 (performance). ENERGY performance level (EPL) display official shall require that an ENERGY performance level(EPL) display card be completed and certified by the builder tobe accurate and correct before final approval of the building foroccupancy. Florida law (Section ,Florida Statutes)requires the EPL display card to be included as an addendum toeach sales contract for both presold and nonpresold residentialbuildings.

4.2 2010 florida building codeenergy conservation residential energy efficiency table 402.1.1 component effciencies required a, l % glazing c

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Transcription of CHAPTER 4 RESIDENTIAL ENERGY EFFICIENCY

1 CHAPTER 4 RESIDENTIAL ENERGY EFFICIENCYSECTION CHAPTER applies to RESIDENTIAL shall comply with Sections 401, , , and , , , and (referred to as the mandatory provisions) and either:1. Sections through , and (pre-scriptive); or2. Section 405 (performance). ENERGY performance level (EPL) display official shall require that an ENERGY performance level(EPL) display card be completed and certified by the builder tobe accurate and correct before final approval of the building foroccupancy. Florida law (Section ,Florida Statutes)requires the EPL display card to be included as an addendum toeach sales contract for both presold and nonpresold residentialbuildings.

2 The EPL display card contains information indicat-ing the ENERGY performance level and efficiencies of compo-nents installed in a dwelling unit. The building official shallverify that the EPL display card completed and signed by thebuilder accurately reflects the plans and specifications submit-ted to demonstrate code compliance for the building . A copy ofthe EPL Display Card can be found in Appendix 402 building THERMAL General (Prescriptive). Component thermal enve-lopeand air distribution system shall meet the requirementsof Table materialused in layers, such as framing cavity insulation andinsulating sheathing, shall be summed to compute thecomponentR-value.

3 The manufacturer s settledR-valueshall be used for blown insulation. ComputedR-valuesshall not include anR-value for other building materialsor air assembly with aU-factor equal to or less than that specified in shall be permitted as an alternative to the cor-responding componentR-value in Table Allother prescriptive criteria of Table , the pre-scriptive criteria in Section and footnotes toTable shall be Total UA the totalbuildingthermal envelopeUA (sum ofU-factor times assemblyarea) is less than or equal to the total UA resulting fromusing theU-factors in Table (multiplied by thesame assembly area as in the proposed building )

4 , thebuilding shall be considered in compliance with All other prescriptive criteria of Table ,the prescriptive criteria in Section and foot-notes to Table shall be met. The UA calculationshall be done using a method consistent with theASHRAEH andbook of Fundamentalsand shall includethe thermal bridging effects of framing materials. TheSHGC requirements of Table shall be met inaddition to UA Limitations to compliance by Section Electric space resistancespace heating systems shall not be used when complyingwith this code by Section Air handlers in handlers may notbe installed in attics when complying with Section Maximum percent window win-dow area as a percentage of the conditioned floor area(CFA) shall not exceed 20.

5 The following exceptions apply to When a fenestration(s) in an existing exteriorwall is being removed or enclosed by an addi-tion, an amount equal to the total area of thisfenestration may be subtracted from the totalglass area prior to determining the installedglass Additions of 600 square feet (56 m2) or less mayhave up to 50 percent glass to conditioned Glass windows and doors that were previouslylocated in an existing exterior wall that is beingremoved or enclosed by an addition do not haveto comply with theU-factor and solar heat gaincoefficient requirements in Table whenreinstalled as part of the Equipment equip-ment efficiencies for cooling, heating and water heatingshall be code minimums as per Sections Specific insulation requirements (Prescriptive).

6 Ceilings with attic Ceilings without attic would require insulation levels above R-30 and thedesign of the roof/ceiling assembly does not allow sufficientspace for the required insulation, the minimum requiredinsulation for such roof/ceiling assemblies shall be reduction of insulation from the requirements of Sec-tion shall be limited to 500 square feet (46 m2)or20percent of the total insulated ceiling area, whichever is reduction shall not apply to theU-factor alternativeapproach in Section and the total UA alternative inSection Access hatches and doors fromconditioned spaces to unconditioned spaces ( , attics2010 FLORIDA building code ENERGY FLORIDA building code ENERGY CONSERVATIONRESIDENTIAL ENERGY EFFICIENCYTABLE EFFCIENCIES REQUIREDa, l%GlazingcFENESTRATIONU-FACTORbSKYLIGHTb U-FACTORGLAZEDFENESTRATIONSHGCbCEILINGR- VALUEROOFREFLECTANCETESTED PERSECTION :R-VALUE/LOCATIONkAIRHANDLERLOCATIONkAIR LEAKAGETESTED SI.)

7 1 foot = are and SHGC are maximums. R-19 batts compressed into a nominal 2 6 framing cavity such that theR-value is reduced by R-1 or more shall be marked with the compressed battR-value in addition to the full The fenestrationU-factor column excludes skylights. The SHGC column applies to all glazed Percent glazing shown shall be the maximum glazing allowed for compliance by Section 402. Percent glazing area shall be measured in window to floor area and shall include skylight R-5 shall be added to the required slab edgeR-values for heated slabs. Insulation depth shall be the depth of the footing or 2 feet, whichever is less inZones 1 through 3 for heated The secondR-value applies when more than half the insulation is on the interior of the mass For impact rated fenestration complying with Section of theFlorida building code , Residentialor Section of theFlorida building code , Buildingthe maximum U-factor shall be Conditioned = entire distribution system located inside both the thermal and air barrier of the home.

8 Unconditioned = any portion located in unconditioned Limitations to compliance by Section 402 found in Section shall be , NonfenestrationU-factors shall be obtained from measurement, calculation or an approved When more than half the insulation is on the interior, the mass wallU-factors shall be a maximum of Basement wallU-factor of FoundationU-factor requirements shown in Table include wall construction and interior air films but exclude soil conductivity and exterior air for determining code compliance in accor-dance with Section (total UA alternative) shall be modified to include soil conductivity and exterior air Window to floor area, including skylights, shall not exceed 20 percent.

9 See Section Limitations to compliance by Section 402 found in Section shall be Ducts and air handlers shall be located inside both the thermal and air barrier of the home. Air leakage shall be no more than Qn = when tested per Section Roof reflectance shall be no more than in accordance with testing to Section crawl spaces) shall be weatherstripped and insulated toa level equivalent to the insulation on the surrounding sur-faces. Access shall be provided to all equipment that pre-vents damaging or compressing the insulation. A woodframed or equivalent baffle or retainer is required to beprovided when loose fill insulation is installed, the purposeof which is to prevent the loose fill insulation from spillinginto the living space when the attic access is opened, and toprovide a permanent means of maintaining the installedR-value of the loose fill Mass walls for the purposes of thischapter shall be considered above-grade walls of concreteblock, concrete, insulated concrete form (ICF), masonrycavity, brick (other than brick veneer), earth (adobe, com-pressed earth block, rammed earth)

10 And solid Steel-frame ceilings, walls, and ceilings, walls and floors shall meet the insulationrequirements of Table (1) or shall meet theU-factorrequirements in Table The calculation of theU-factor for a steel-frame envelope assembly shall use aseries- parallel path calculation :Steel frame wall assemblies with studsspaced at 24 inches (610 mm) on center shall be permit-ted to use the equivalent insulation requirements in (2):Alternatively, steel frame wall assemblies shall be permit-ted to use the equivalencies established in ASHRAE/IESNA Standard Appendix A, Tables A and (1)STEEL-FRAME CEILING, WALL AND FLOOR INSULATION(R-VALUE)


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