1、Designation: C1743 12Standard Practice forInstallation and Use of Radiant Barrier Systems (RBS) inResidential Building Construction1This standard is issued under the fixed designation C1743; the number immediately following the designation indicates the year oforiginal adoption or, in the case of re
2、vision, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope1.1 This practice has been prepared for use by the designer,specifier, builder, and the installer of r
3、adiant barrier systems(RBS) for use in (multi- and single-family) residential buildingconstruction, not otherwise restricted from use. The scope islimited to instructions relative to the use and installation ofRBS, including a surface(s) normally having an emittance of0.1 or less, such as metallic f
4、oil or metallic foil deposits,mounted on substrates. Some examples that this practice isintended to address include: (1) low-emittance surfaces invented building envelope cavities intended to retard radianttransfer across the airspace: (2) low-emittance surfaces atinterior building surfaces intended
5、 to retard radiant transfer to,or from, building inhabitants; and (3) low-emittance surface atinterior building surfaces intended to reduce radiant transfer to,or from, radiant heating or cooling systems.1.2 This practice covers the installation process from pre-installation inspection through the p
6、ost-installation procedure.It does not cover the production of the radiant barrier materials.(See Specification C1313.)1.3 This practice is not intended to replace the manufactur-ers installation instructions but shall be used in conjunctionwith such instructions. This practice is not intended to su
7、per-cede local, state, federal, or international codes.1.4 This practice assumes that the installer possesses a goodworking knowledge of the applicable codes and regulations,safety practices, tools, equipment, and methods necessary forinstallation of radiant barrier materials. It also assumes that t
8、heinstaller understands the fundamentals of residential buildingconstruction that affect the installation of RBS.1.5 The values stated in inch-pound units are to be regardedas standard. The values given in parentheses are mathematicalconversions to SI units that are provided for information onlyand
9、are not considered standard.1.6 This standard does not purport to address all of thesafety concerns, if any, associated with its use. It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations
10、prior to use. For specificprecautionary statements see Sections 5 and 7.2. Referenced Documents2.1 ASTM Standards:2C168 Terminology Relating to Thermal InsulationC1313 Specification for Sheet Radiant Barriers for BuildingConstruction Applications2.2 NFPA Standards3NFPA 54 National Fuel Gas CodeNFPA
11、211 Standard for Chimneys, Fireplaces and Vents2.3 Other Document:4CPSC Product Safety Fact Sheet No. 18 “The Home Elec-trical System”3. Terminology3.1 DefinitionsFor definitions of terms used in this prac-tice, refer to Terminology C168.3.2 Definitions of Terms Specific to This Standard:3.2.1 appli
12、cator, nperson or persons who apply radiantbarrier materials in buildings.3.2.2 conditioned space, nany space in a building that isserved by a heating or cooling system.3.2.3 open air space, nvented building cavity (for ex-ample, a vented attic) or a large conditioned or unconditionedbuilding space.
13、3.2.3.1 DiscussionA large building space is defined asone whose minimum dimension exceeds 2 ft (0.6 m).3.2.4 radiant barrier system, RBS, nbuilding constructionassembly consisting of a low-emittance (0.1 or less) surfacebounded by an open air space on one or both sides.3.2.4.1 DiscussionA RBS is use
14、d for the sole purpose oflimiting heat transfer by radiation, into or out of a building1This practice is under the jurisdiction of ASTM Committee C16 on ThermalInsulation and is the direct responsibility of Subcommittee C16.21 on ReflectiveInsulation.Current edition approved May 1, 2012. Published J
15、une 2012. originally approvedin 2010. Last previous edition approved in 2010 as C174310. DOI: 10.1520/C174312.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the st
16、andards Document Summary page onthe ASTM website.3Available from National Fire Protection Association (NFPA), 1 BatterymarchPark, Quincy, MA 02169-7471, http:/www.nfpa.org.4Available from U.S. Consumer Product Safety Commission (CPSC), 4330 EastWest Hwy., Bethesda, MD 20814, http:/www.cpsc.gov.1Copy
17、right ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.assembly. An RBS is not specifically intended to reduce heattransfer by convection or conduction.4. Significance and Use4.1 In this practice it is recognized that effectiveness, safety,and d
18、urability of an RBS depends not only on the quality of thematerials, but also on proper installation.4.2 Improper installation of an RBS will reduce the thermaleffectiveness, cause fire risks and other unsafe conditions, andpromote deterioration of the structure in which it is installed.Improper ins
19、tallations include fires caused by: (1) heat buildupin recessed lighting fixtures, (2) deterioration or failure ofelectrical wiring components, and (3) deterioration in woodstructures and paint failure as a result of moisture accumula-tion.4.3 This practice provides directions for the installation o
20、fRBS products in a safe and effective manner. Actual conditionsin existing buildings vary greatly and care shall be taken toensure safe and effective installation.4.4 In this practice requirements are presented that are bothgeneral and specific in nature and practical. They are notintended as specif
21、ic instructions unless so indicated. The usershall consult the manufacturer for recommended applicationand installation methods. The requirements in this practiceshall be the minimum material and installation requirementsfor RBS.5. Safety Precautions5.1 The applicator shall wear proper clothing and
22、equipmentas specified by the manufacturer and shall follow all local,state, and federal codes and safety regulations for buildingconstruction sites, for example hard hats, safety gogglesrespiratory protection, and other safety items.6. Pre-Installation Inspection and Preparation6.1 Pre-Installation
23、Inspections: New and Retrofit Build-ings:6.1.1 Inspect the roof, wall, ceiling, and floor buildingmaterials to identify areas in which previous or existingmoisture problems have caused paint peeling, lumber warpage,staining, visible fungal growth, rotting, or other structuraldamage. Do not install t
24、he RBS in such areas until theowner/builder has been informed and has certified that theseconditions have been corrected and the cause of the conditionrepaired.6.1.2 In areas where an RBS is to be installed, componentsof the electrical system shall be in good condition. When thereis reason to believ
25、e the electrical system is faulty, do not installRBS in such areas until the owner/builder has been informedand qualified inspection and repair has been accomplished.NOTE 1The CPSC Product Safety Fact Sheet No. 18 has identified thefollowing signs of potential electrical deficiencies: lights dimming
26、, fusesblowing, circuit breakers tripping frequently, electrical sparks and glowingfrom receptacle, light flickering, and cover plates on switches and outletsthat are warm or hot to the touch.6.1.3 In areas where an RBS is to be installed, the applicatorshall locate and plan for installation around
27、ventilation open-ings. The applicator shall not install RBS that will obstruct orblock existing ventilation openings, such as gable ends, dor-mers, ridge, off ridge, soffit vents, or any others.6.2 Preparations:6.2.1 All electrical wiring at, or near, radiant barrier mate-rial attachment surfaces sh
28、all be either moved, or protected, toensure that fasteners used to install the radiant barrier materialcannot contact the electrical wiring system.6.2.2 When attic ventilation and new, or existing, ceilinginsulation will be compromised by the installation of an RBS,vent baffles shall be installed at
29、 the soffits of the attic such thatattic ventilation air flows are maintained in accordance withapplicable building codes.7. Installation Guidelines-New and Retrofit Buildings7.1 Material Handling:7.1.1 The radiant barrier material shall be handled inaccordance with the manufacturers instructions, s
30、hall be keptdry, and shall not be in contact with the ground or sources ofwater.7.1.2 The radiant barrier material shall not be placed incontact with corrosive building materials.7.2 Performance Considerations:7.2.1 The performance of the RBS depends on adherence tomanufacturers specifications. Manu
31、facturers installation in-structions and all applicable building codes shall be followed.The manufacturer shall provide the product informationsheet(s) that specify the products intended use(s), applicationmethod(s), health and safety considerations, and materialproperties per Specification C1313.7.
32、2.2 The performance of the RBS is dependent on thepresence of an open airspace adjacent to at least one low-emittance surface.7.2.3 The performance of the RBS will be adversely af-fected by foreign materials on the low-emittance surface.Before installation, foreign materials shall be removed usingma
33、nufacturers instructions, taking care not to damage theradiant barrier material.7.2.4 The performance of a radiant barrier will be reducedby a corrosive environment. In some instances, severe pollut-ants react with the low-emittance surface causing an increase inthe emittance of the material. When s
34、uch conditions exist, theowner/builder shall be informed that these conditions have thepotential to result in material degradation and a decrease inRBS performance.7.2.5 In some instances, the performance of a radiant barrierwill be reduced by the presence of moisture on the low-emittance surface. S
35、uch conditions are potentially temporary orlong term and the manufacturer shall be consulted to determinethe applicability of RBS when these conditions are expected tooccur.7.2.6 The performance of the RBS will be adversely af-fected by the accumulation of dust over time on the low-emittance surface
36、. RBS shall be installed to avoid the settle-ment of dust on the radiant barrier surface. Dust is not aconcern on a downward facing RBS.7.2.7 Damaged areas will result in loss of performance andshall be repaired in accordance with the manufacturers in-structions.7.3 Installation Precautions:C1743 12
37、27.3.1 In areas in which radiant barrier materials are to beinstalled, the applicator shall provide clearance around lightingfixtures, motors, fans, blowers, heaters, flues, chimneys, andother heat-producing electrical and mechanical devices.7.3.1.1 The applicator shall provide 3-in. (75-mm) mini-mu
38、m clearance around all sides of recessed lighting fixturesunless such fixtures are approved for installation in directcontact with radiant barrier materials. Such fixtures includefixture wiring compartments, ballasts, and other heat-producing devices. These devices shall not be covered unlessthey ar
39、e specifically approved for operation when covered.7.3.1.2 The applicator shall provide the minimum clear-ances specified in NFPA 54. Provide a 2-in. (50-mm) minimumclearance from the outside face of the masonry around masonrychimneys or masonry enclosing a flue. For vents, vent connec-tors, and chi
40、mneys other than masonry, provide minimumclearances as specified in NFPA 211.7.3.1.3 The operative material of most RBS is a metallic foilor vapor deposition of a metal on a substrate. Therefore, radiantbarrier materials can provide an extremely high resistance towater vapor transmission. Radiant ba
41、rriers shall not be in-stalled so as to lead to moisture accumulation and deteriorationin the structure. Some radiant barriers are produced to providelow resistance to water vapor transmission. High vaporpermeable- house wraps and perforated products are examples.7.3.1.4 In wood or steel framed buil
42、dings (new or retrofit),a perforated radiant barrier shall always be used when ceilinginsulation is installed, such as in roof or sidewall installations,in direct contact with the radiant barrier (cold-winter side).When the radiant barrier is below or next to an unfacedinsulation in the wall or roof
43、 (warm-winter side), a nonperfo-rated radiant barrier shall be used.7.3.1.5 Regardless of construction type, all radiant barriermaterials that are installed with the low-emittance material(s)in direct contact with other metals shall be separated by anacceptable thermal break.7.4 Installation:7.4.1 D
44、etermine that the RBS material and installation meetthe following criteria:7.4.1.1 Testing and certificationThe materials shall meetall the requirements of Specification C1313 as well as complywith all certification and codes governing the use and installa-tion of radiant barriers.7.4.1.2 Installati
45、onThe installer or applicator shall installthe RBS according to the manufacturers installation instuc-tions. In addition, the following minimum installation proce-dures shall be followed when installing an RBS in specificareas of the structure such as:(1) AtticThere are four methods of installing a
46、RBS:(a) Factory applied (laminated) or field-applied RBS (stapled)to the underside of the roof deck facing towards the interior(Fig. 1. A perforated RBS is always required for this type ofinstallation. A single- or double-sided radiant barrier materialshall be used in the deck-applied installation,
47、as long as alow-emittance surface (dull or shiny) faces downward;(b) Draped over the rafters or trusses (top chord) beforesheeting the roof (Fig. 2);(c) Installed between the rafters or top chords of the trusses(Fig. 3);(d) Secured to the bottom surface of the rafters or truss (topchord) (Fig. 4); a
48、nd(e) Shall maintain a minimum 112-in. (3.8-cm) airspace at thecenter of the truss/rafter span between the radiant barriersurface and the underside of the roof deck in installations (b)through (d), and a perforated radiant barrier is not required inthese installations (Figs. 2-4). Gable end walls an
49、d all othervertical attic surfaces above the ceiling insulation, such as kneewalls and division walls in multi-family housing, shall becovered by either a single- or double-sided radiant barrier,perforated or not, installed with a low-emittance surface facingthe attic cavity for visual inspection purposes (Fig. 7).NOTE 2In retrofit and new construction, secure a perforatedradiant barrier directly to the underside portion of the roofdeck, over the eave or soffit, so that the barriers coverageextends at least 3 in. (7.6 cm) beyond the top plate of thesidewall w
