1、Designation: C 1481 00 (Reapproved 2006)Standard Guide forUse of Joint Sealants with Exterior Insulation and FinishSystems (EIFS)1This standard is issued under the fixed designation C 1481; the number immediately following the designation indicates the year oforiginal adoption or, in the case of rev
2、ision, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.1. Scope1.1 This guide describes the use of single and multi-component, cold-applied joint sealants, or precur
3、ed sealantsystems for joint sealing applications, or both, in buildingsusing exterior insulation and finish systems (EIFS) on one orboth sides of the joint. Refer to 10.1 for joint seal geometries.1.2 The elastomeric sealants described by this guide meetthe requirements of Specifications C 834, C 92
4、0,orC 1311.1.3 The values stated in SI units are to be regarded as thestandard. The values given in parentheses are provided forinformation only.1.4 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 stand
5、ard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use. For specific hazardstatements, see Notes 1 and 2.1.5 There are no ISO standards similar or equivalent to thisASTM standard.2. Referenced Documents2.1 ASTM Standards:2C 7
6、17 Terminology of Building Seals and SealantsC 719 Test Method for Adhesion and Cohesion of Elasto-meric Joint Sealants Under Cyclic Movement (HockmanCycle)C 794 Test Method for Adhesion-in-Peel of ElastomericJoint SealantsC 834 Specification for Latex SealantsC 920 Specification for Elastomeric Joi
7、nt SealantsC 1193 Guide for Use of Joint SealantsC 1299 Guide for Use in Selection of Liquid-Applied Seal-antsC 1311 Specification for Solvent Release SealantsC 1382 Test Method for Determining Tensile AdhesionProperties of Sealants When Used in Exterior Insulation andFinish Systems (EIFS) JointsC 1
8、397 Practice for Application of Class PB Exterior Insu-lation and Finish SystemsC 1472 Guide for Calculating Movement and Other EffectsWhen Establishing Sealant Joint Width2.2 ANSI Standard:American National Standard for Exterior Insulation andFinish Systems (EIFS)33. Terminology3.1 Definitions:3.1.
9、1 Refer to Terminology C 717 for definitions of thefollowing terms used in this guide: bicellular sealant backing,bond breaker, bridge sealant joint, butt sealant joint, chemi-cally curing sealant, closed cell sealant backing, compatibility,compatible materials, cure, elastomeric, elongation, fillet
10、 seal-ant joint, joint, lap sealant joint, latex sealant, modulus,non-sag sealant, open cell sealant backing, primer, seal,sealant, sealant backing, shelf-life, solvent-release sealant,shrinkage, substrate, tooling, tooling time, working life (potlife).3.1.2 Refer to Terminology C 1397 for definitio
11、ns of thefollowing terms used in this guide: accessories, base coat,cure, dry, durability, embed, expansion joint, exterior insula-tion and finish system (EIFS), finish coat, lamina, nonmetallicreinforcing mesh, primers, reinforced base coat, substrate,texture, thermal insulation board, wrap, wrappi
12、ng.4. Significance and Use4.1 The intent of this guide is to provide information andguidelines for the selection of materials for joint seals in, oradjacent to, EIFS.1This guide is under the jurisdiction ofASTM Committee C24 on Building Sealsand Sealants and is the direct responsibility of Subcommit
13、tee C24.10 on Specifi-cations, Guides and Practices.Current edition approved Jan. 1, 2006. Published January 2006. Originallyapproved in 2000. Last previous edition approved in 2000 as C 1481-00.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at
14、serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.3Available from American National Standards Institute (ANSI), 25 W. 43rd St.,4th Floor, New York, NY 10036.1Copyright ASTM International, 100 Barr Harbor Drive, PO Bo
15、x C700, West Conshohocken, PA 19428-2959, United States.4.2 Joints need to be designed for the expected movementsand construction tolerances so an appropriate joint width canbe established.DESIGN CONSIDERATIONS5. General5.1 The major components of a joint seal in, or adjacent to,EIFS that should be
16、considered when selecting or usingsealants are as follows: EIFS substrate, primer, sealant backingor bond-breaker, and sealant (see Figs. 1-11).6. EIFS Substrate6.1 Joint Location and ConfigurationIn an EIFS-cladbuilding, sealant joints typically are required at the followinglocations:6.1.1 At the f
17、loor line of multi-level wood frame construc-tion;6.1.2 At an existing building expansion joint;6.1.3 Where dissimilar substrates are bridged;6.1.4 When an EIFS abuts dissimilar building construction;6.1.5 Some EIFS manufacturers may require joints in longcontinuous elevations;6.1.6 The size and loc
18、ation of joints is the responsibility ofthe design professional and shall be consistent with the projectconditions and guidelines of the EIFS manufacturer.6.1.7 Joint ConfigurationIndustry accepted minimumjoint width is 19 mm (34 in.) with sufficient depth to accom-modate the sealant backing and sea
19、lant material. Lesser jointwidths may be allowable where EIFS abuts adjacent materials.Consider the sealant manufacturers published sealant move-ment capability when determining the appropriate joint width.Refer to Guide C 1472. Good architectural practice calls forjoint designs that allow for const
20、ruction tolerances and materialvariations.LegendA. SealantB. Sealant BackingC. Bond BreakerD. JointE. Textured FinishF. Reinforcing Mesh Embedded in BaseCoatG. Backwrap Mesh Around InsulationBoardH. Insulation BoardI. Adhesive (If Applicable)FIG. 1 Sealant Butt Joint Seal (EIFS to EIFS)LegendA. Seal
21、antB. Sealant BackingC. Bond BreakerD. JointE. Textured FinishF. Reinforcing Mesh Embedded in BaseCoatG. Backwrap Mesh Around InsulationBoardH. Insulation BoardI. Adhesive (If Applicable)FIG. 2 Sealant Butt Joint Seal (EIFS to Dissimilar Substrates)LegendA. SealantB. Sealant BackingC. Bond BreakerD.
22、 JointE. Textured FinishF. Reinforcing Mesh Embedded in BaseCoatG. Backwrap Mesh Around InsulationBoardH. Insulation BoardI. Adhesive (If Applicable)FIG. 3 Recessed Sealant Butt Joint Seal (EIFS to EIFS)C 1481 00 (2006)26.2 EIFS InstallationThe EIFS manufacturers recom-mended installation procedures
23、 should be followed at all times.6.2.1 Practice C 1397 provides a minimum requirement forthe application of Class PB EIFS.LegendA. SealantB. Sealant BackingC. Bond BreakerD. JointE. Textured FinishF. Reinforcing Mesh Embedded in BaseCoatG. Backwrap Mesh Around InsulationBoardH. Insulation BoardI. Ad
24、hesive (If Applicable)J. Trim AccessoryFIG. 4 Sealant Butt Joint Seal (Accessory to Accessory)LegendA. SealantB. Sealant BackingC. Bond BreakerD. JointE. Textured FinishF. Reinforcing Mesh Embedded in BaseCoatG. Backwrap Mesh Around InsulationBoardH. Insulation BoardI. Adhesive (If Applicable)J. Tri
25、m AccessoryFIG. 5 Sealant Butt Joint Seal (Accessory to DissimilarSubstrate)LegendA. SealantB. Sealant BackingC. Bond BreakerD. JointE. Textured FinishF. Reinforcing Mesh Embedded in BaseCoatG. Backwrap Mesh Around InsulationBoardH. Insulation BoardI. Adhesive (If Applicable)FIG. 6 Sealant Bridge Jo
26、int Seal Using LiquidApplied Sealantand Bond BreakerLegendA. SealantB. Sealant BackingC. Bond BreakerD. JointE. Textured FinishF. Reinforcing Mesh Embedded in BaseCoatG. Backwrap Mesh Around InsulationBoardH. Insulation BoardI. Adhesive (If Applicable)FIG. 7 Sealant Bridge Joint Seal Using Precured
27、SealantC 1481 00 (2006)36.2.2 Exposed edges of thermal insulation board whichcreate the sides of the joint must be protected with EIFSmanufacturers nonmetallic reinforcing mesh fully embeddedin their base coat. This procedure is referred to as wrapping.There shall be no exposed mesh at joint locatio
28、ns or elsewhere.6.2.3 EIFS manufacturers may require the use of an acces-sory to terminate a joint (see Figs. 4 and 5). Where an EIFSmanufacturers approved accessory is used as a terminationand sealant substrate, wrapping may not be required.6.2.4 The EIFS substrate must be allowed sufficient time t
29、ocure or dry before application of sealants. A minimum dryingtime of 24 h is required. Curing/drying time may be affected byenvironmental conditions as well as whether the EIFS substrateis cementitious or noncementitious. Consult EIFS manufac-turer for recommendations for appropriate curing/drying t
30、ime.6.2.5 Some EIFS manufacturers require a primer over thebase coat. The primer, provided by the EIFS manufacturer, maybe used to promote sealant adhesion, protect cementitious basecoat from efflorescence and/or provide color uniformity.6.2.6 The application of finish coat into the joint is general
31、lynot recommended by EIFS manufacturers. The test methoddescribed in Test Method C 1382 allows evaluation of aspecific sealant to a specific EIFS substrate.6.3 EIFS Joint Preparation:6.3.1 Joints must be clean, dry, and free of frost or othersurface contaminants.6.3.2 Generally joints shall be clean
32、ed with a nonmetallicstiff bristle brush or oil-free compressed air. Solvents may beincompatible with the EIFS or underlying thermal insulationboard. Consult the EIFS manufacturer to determine if a specificsolvent is compatible with their EIFS.LegendA. SealantB. Sealant BackingC. Bond BreakerD. Join
33、tE. Textured FinishF. Reinforcing Mesh Embedded in BaseCoatG. Backwrap Mesh Around InsulationBoardH. Insulation BoardI. Adhesive (If Applicable)J. Sealant BeadFIG. 8 Sealant Fillet Joint Seal With Bond BreakerLegendA. SealantB. Sealant BackingC. Bond BreakerD. JointE. Textured FinishF. Reinforcing M
34、esh Embedded in BaseCoatG. Backwrap Mesh Around InsulationBoardH. Insulation BoardI. Adhesive (If Applicable)J. Sealant BeadFIG. 9 Sealant Fillet Joint Seal With Triangular Sealant BackingLegendA. SealantB. Sealant BackingC. Bond BreakerD. JointE. Textured FinishF. Reinforcing Mesh Embedded in BaseC
35、oatG. Backwrap Mesh Around InsulationBoardH. Insulation BoardI. Adhesive (If Applicable)J. Sealant BeadFIG. 10 Sealant Fillet Joint Seal Using Precured SealantC 1481 00 (2006)47. Sealant Primer7.1 The general purpose of a sealant primer is to improveadhesion of a sealant to the EIFS substrate.7.1.1
36、In accordance with Test Methods C 794 and C 1382,determine whether a sealant primer is required to a specificEIFS substrate or accessory.7.1.2 Sealant primer shall not cause damage to the EIFS andunderlying thermal insulation board.7.1.3 With some sealants, different sealant primers may berequired o
37、n substrates which abut the EIFS. This poses adifficult application problem and should be taken into consid-eration when selecting a sealant.7.1.4 Apply sealant primer in accordance with the sealantmanufacturers recommendations and allow the sealant primerto cure or dry as recommended by the manufac
38、turer beforeinstalling sealant backing and sealant.8. Sealant Backing or Bond Breaker8.1 Proper joint design requires the use of appropriatesealant backing to prevent three-sided adhesion, allow toolingof the sealant and control joint profile. Closed cell andbicellular sealant backings are generally
39、 accepted by EIFSmanufacturers. Open cell sealant backing, such as open cellpolyurethane, can absorb and hold water which may cause adeleterious effect on the EIFS and are not recommended byEIFS manufacturers.8.1.1 Where sealant backing cannot be installed, a bondbreaker must be applied to prevent t
40、hree sided adhesion.9. Sealant9.1 The sealant shall be selected based on the environmentalconditions in which it will be used. Test Method C 1382evaluates the performance of sealants with EIFS in a variety ofconditions. Results of this test provide information to thedesign profession as to which sea
41、lant may be the mostappropriate for its end use.9.1.1 Sealant types and classifications are discussed inC 1193 and C 1299.9.1.2 Section 10.1.4 on Self-Leveling of Guide C 1193 doesnot apply.9.1.3 Section 10.10.5 on Tooling Liquids of Guide C 1193does not apply when sealants are used with EIFS.10. Jo
42、int Seal Geometry10.1 Sealant joint seals may have any of four joint sealgeometry types: butt joint, bridge joint, fillet joint, and lapjoint. Good design practice requires a minimum sealant bondcontact of 6 mm (14 in.) for any joint seal geometry type.10.2 A butt joint is the most common type of se
43、alant jointseal and may be used at EIFS to EIFS (Fig. 1) and joints whereEIFS abuts dissimilar materials (Fig. 2). To allow for potentialjoint restoration should the first joint fail, consider installingthe sealant joint recessed from the EIFS surface (Fig. 3). TestMethod C 1382 specifically evaluat
44、es performance of a sealantwith EIFS in a similar joint seal geometry.10.3 A sealant bridge joint seal is commonly used to restorean existing sealant joint seal in a nondestructive manner butalso may be used in new construction. The sealant of a bridgejoint seal may be in the form of a liquid-applie
45、d sealant (Fig.6) or a precured sealant joint seal (Fig. 7). A precured sealantjoint seal typically uses a compatible liquid-applied sealant asan adhesive to form a watertight joint. A sealant bridge sealmay be evaluated in accordance with a modified Test MethodC 1382 procedure to the EIFS substrate
46、. Evaluation by amodified Test Method C 1382 procedure will assist the speci-fier in determining whether application of a sealant bridge jointseal directly to the EIFS finish coat is appropriate.10.4 A sealant fillet joint commonly is used where EIFSabuts dissimilar materials that are approximately
47、perpendicularto each other. A bond breaker material shall be installed priorto applying the wet sealant to prevent three sided adhesion. Thebond breaker material may be in the form of a tape (Fig. 8)ortriangular sealant backing material (Fig. 9). A precured sealantjoint seal may also be used in this
48、 condition (Fig. 10). Amodified procedure in Test Method C 1382 may be used toevaluate this joint seal geometry.10.5 A sealant lap joint (Fig. 11) is applied within the jointbetween approximately parallel substrates that are face to face.This type joint seal is not commonly found in EIFS applica-tio
49、ns. Test Method C 1382 is not currently applicable toevaluate a sealant lap joint seal since joint movement is inshear as opposed to tension.11. Test Methods11.1 This guide is primarily intended to discuss the use ofTest Method C 1382 to evaluate the tensile adhesion propertiesLegendA. SealantB. Sealant BackingC. Bond BreakerD. JointE. Textured FinishF. Reinforcing Mesh Embedded in BaseCoatG. Backwrap Mesh Around InsulationBoardH. Insulation BoardI. Adhesive (If Applicable)FIG. 11 Sealant Lap Joint SealC 1481 00 (2006)5of sealants and EIFS. Test Methods C 719 and C 794
