1、Designation: C1481 12 (Reapproved 2017)Standard Guide forUse of Joint Sealants with Exterior Insulation and FinishSystems (EIFS)1This standard is issued under the fixed designation C1481; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revis
2、ion, 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 guide describes the use of single and multi-component, cold-applied joint sealants, or precured
3、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 C834, C920,orC
4、1311.1.3 The values stated in SI units are to be regarded asstandard. No other units of measurement are included in thisstandard.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 standard to establish
5、 appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.1.5 There are no ISO standards similar or equivalent to thisASTM standard.2. Referenced Documents2.1 ASTM Standards:2C717 Terminology of Building Seals and SealantsC719 Test Method for A
6、dhesion and Cohesion of Elasto-meric Joint Sealants Under Cyclic Movement (HockmanCycle)C794 Test Method forAdhesion-in-Peel of Elastomeric JointSealantsC834 Specification for Latex SealantsC920 Specification for Elastomeric Joint SealantsC1193 Guide for Use of Joint SealantsC1311 Specification for
7、Solvent Release SealantsC1382 Test Method for Determining Tensile Adhesion Prop-erties of Sealants When Used in Exterior Insulation andFinish Systems (EIFS) JointsC1397 Practice for Application of Class PB Exterior Insula-tion and Finish Systems (EIFS) and EIFS with DrainageC1472 Guide for Calculati
8、ng Movement and Other EffectsWhen Establishing Sealant Joint WidthE2110 Terminology for Exterior Insulation and Finish Sys-tems (EIFS)E2511 Guide for Detailing of EIFS-Clad Barrier and Drain-age Wall AssembliesE2568 Specification for PB Exterior Insulation and FinishSystems2.2 ANSI Standard:American
9、 National Standard for Exterior Insulation andFinish Systems (EIFS)33. Terminology3.1 Definitions:3.1.1 Refer to Terminology C717 for definitions of thefollowing terms used in this guide: bicellular sealant backing,bond breaker, bridge sealant joint, butt sealant joint, chemi-cally curing sealant, c
10、losed cell sealant backing, compatibility,compatible materials, cure, elastomeric, elongation, fillet seal-ant joint, joint, lap sealant joint, latex sealant, modulus,non-sag sealant, open cell sealant backing, precured sealant,primer, seal, sealant, sealant backing, shelf-life, solvent-release seal
11、ant, shrinkage, substrate, tooling, tooling time,working life (pot life).3.1.2 Refer to Terminology E2110 for definitions of thefollowing terms used in this guide: accessories, base coat,cure, dry, durability, edge wrap, embed, expansion joint,exterior insulation and finish system (EIFS), finish coa
12、t,lamina, nonmetallic reinforcing mesh, primers, reinforced basecoat, substrate, texture, thermal insulation board, wrap.4. Significance and Use4.1 The intent of this guide is to provide information andguidelines for consideration by the designer or applicator of1This guide is under the jurisdiction
13、 ofASTM Committee C24 on Building Sealsand Sealants and is the direct responsibility of Subcommittee C24.10 onSpecifications, Guides and Practices.Current edition approved Jan. 1, 2017. Published February 2017. Originallyapproved in 2000. Last previous edition approved in 2012 as C1481-12. DOI:10.15
14、20/C1481-12R17.2For 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 standards Document Summary page onthe ASTM website.3Available from American National Standards In
15、stitute (ANSI), 25 W. 43rd St.,4th Floor, New York, NY 10036.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United StatesThis international standard was developed in accordance with internationally recognized principles on standardization establis
16、hed in the Decision on Principles for theDevelopment of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.1joint seals in, or adjacent to, EIFS. Refer to SpecificationE2568 for additional information pertaining to s
17、pecifying ClassPB EIFS. Refer to Guide E2511 for additional informationpertaining to detailing of EIFS-Clad Wall Assemblies.4.2 Proper selection and use of a sealant is fundamental toits ultimate performance, service life, and durability. A sealantjoint subjected to movement and other similar perfor
18、mancefactors should be designed for the particular application toavoid compromising its performance capability and causingfailures. Refer to C1193 for guidance.4.3 In addition to the design and installation data in thisguide, consult the sealant manufacturer about applications forits products and th
19、eir proper use and installation.5. General5.1 The major components of a joint seal in, or adjacent to,EIFS that should be considered when selecting or usingsealants are as follows: EIFS, primer, sealant backing orbond-breaker, adjacent substrates and sealant (see Figs. 1-11).NOTE 1This legend applie
20、s to Figs. 1-11LegendA. SealantB. Sealant BackingC. Bond BreakerD. Joint WidthE. Finish CoatF. Reinforcing Mesh Embedded in BaseCoatG. Wrapped Mesh Embedded in BaseCoatH. Insulation BoardI. Adjacent SubstrateJ. Sealant BeadK. Manufacturers Primer or Paint Coat-ing (if required)L. Trim AccessoryM. Pr
21、ecured SealantN. Existing Sealant Joint with OptionalCut Down the Middle5.2 EIFS presents a substrate that may be acceptable forsealant adhesion if the sealant joint is properly designed inaccordance with the EIFS and sealant manufacturer recommen-dations. Most EIFS manufacturers recommend adhering
22、seal-ant directly to the base coat or primed base coat and avoidingadhesion to the finish coat, which can soften on exposure tomoisture and lose cohesion as the sealant extends and exerts astress on the finish coat. Typically, a sealant that has a lowmodulus should be used. A low modulus sealant wil
23、l have alower stress at the sealant and substrate interface when the jointis in extension.FIG. 1 Sealant Butt Joint Seal (EIFS to EIFS)FIG. 2 Sealant Butt Joint Seal (EIFS to Dissimilar Substrates)FIG. 3 Recessed Sealant Butt Joint Seal (EIFS to EIFS)FIG. 4 Sealant Butt Joint Seal (Accessory to Acce
24、ssory)C1481 12 (2017)2NOTE 1References4,5,6provide information pertaining to the evalua-tion of various sealants with EIFS, factors affecting durability of sealantsin contact with the finish coating of EIFS, and thermal movement analysisfor panelized PB EIFS Claddings.4Yarosh, K. F., “Evaluation of
25、Various Sealants with EIFS,” Science andTechnology of Building Seals, Sealants, Glazing, and Waterproofing - SeventhVolume, ASTM STP 1334, J. M. Klosowski, Ed., ASTM International, 1998, pp.169-178.5Kenney, R. J., and Piper, R. S., “Factors Affecting the Durability of Sealants inContact with the Fin
26、ish Coating of EIF Systems,” Science and Technology ofBuilding Seals, Sealants, Glazing, and Waterproofing, ASTM STP 1168, C. J. Parise,Ed., ASTM International, 1992, pp. 117127.6Williams, M. F., and Williams, B. L., “Thermal Movement Analyses forPanelized Polymer-Based Exterior Insulation and Finis
27、h System (PB EIFS)Claddings,” Science and Technology of Building Seals, Sealants, Glazing, andWaterproofing, ASTM STP 1168, C. J. Parise, Ed., ASTM International, 1992, pp.128-138.FIG. 5 Sealant Butt Joint Seal (Accessory to Dissimilar Substrate)FIG. 6 Sealant Bridge Joint Seal Using LiquidApplied S
28、ealantand Bond BreakerFIG. 7 Sealant Bridge Joint Seal Using Precured SealantFIG. 8 Sealant Fillet Joint Seal With Bond BreakerFIG. 9 Sealant Fillet Joint Seal With Triangular Sealant BackingFIG. 10 Sealant Fillet Joint Seal Using Precured SealantFIG. 11 Sealant Lap Joint SealC1481 12 (2017)35.3 Due
29、 to the difficulty that can be encountered in perform-ing remedial work for an EIFS sealant joint, the selectedsealant should have very good environmental weatheringcharacteristics so that it will last for the maximum usefullifetime of the sealant. Since an EIFS system is water-based, ifit becomes s
30、aturated with rainwater or snow melt, the adhesionof a sealant to an EIFS base coat can be lessened. Informationon sealant tensile adhesion properties when used with EIFS canbe found in Test Method C1382. EIFS can be damaged bygrinding or cutting during sealant removal, so it is a goodcandidate for
31、use of a bridge type sealant joint or precuredsealant, in a remedial application. This may be helpful since itdoes not require the removal of all the old or failed sealant butdoes change the appearance of the joint seal.6. EIFS6.1 Joint Location and ConfigurationIn an EIFS-cladbuilding, sealant join
32、ts typically are required at the followinglocations:6.1.1 At the floor line of multi-level wood frame construc-tion;6.1.2 At an existing building expansion joint;6.1.3 Where dissimilar substrates form the joint;6.1.4 When an EIFS abuts dissimilar building construction;6.1.5 Some EIFS manufacturers m
33、ay require movementjoints in long continuous elevations;6.1.6 The size and location 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 ConfigurationThe EIFS Industry acceptedminimum joint wi
34、dth for EIFS applications is 19 mm withsufficient depth to accommodate the sealant backing andsealant material. Some EIFS manufacturers may permit jointwidths that are less than 19 mm. Consider the sealant manu-facturers published sealant movement capability when deter-mining the appropriate joint w
35、idth. Refer to Guide C1472 foradditional information on establishing the sealant joint size.Good architectural practice calls for joint designs that allow forconstruction tolerances and material variations.6.2 EIFS InstallationThe EIFS manufacturers recom-mended installation procedures should be fol
36、lowed at all times.6.2.1 Practice C1397 provides a minimum requirement forthe application of Class PB EIFS.6.2.2 Exposed edges of thermal insulation board whichcreate the sides of the joint must be protected by wrapping theedge with base coat and reinforcing mesh, trim accessory, orother method spec
37、ified by the EIFS manufacturer.6.2.2.1 Encapsulation of the exposed edges of the thermalinsulation board with nonmetallic reinforcing mesh in the basecoat is referred to as wrapping. There shall be no exposedthermal insulation or mesh at joint locations or elsewhere.6.2.2.2 EIFS manufacturers may re
38、quire the use of anaccessory to terminate a joint (see Figs. 4 and 5). Where anEIFS manufacturers approved trim accessory is used as atermination and sealant substrate, wrapping may not be re-quired.6.2.3 The base coat portion of the lamina for the EIFS mustbe allowed sufficient time to cure or dry
39、before the applicationof sealants. A minimum drying time of 24 h is required.Curing/drying time may be affected by environmental condi-tions as well as whether the EIFS base coat is cementitious ornoncementitious. Consult EIFS manufacturer for recommen-dations for appropriate curing/drying time.6.2.
40、4 Some EIFS manufacturers require a primer or paintcoating over the base coat within the joint. The primer,provided by the EIFS manufacturer, may be used to promotesealant adhesion, protect cementitious base coat from efflores-cence and/or provide color uniformity.6.2.5 The application of finish coa
41、t into the joint is generallynot recommended by EIFS manufacturers. The test methoddescribed in Test Method C1382 allows evaluation of a specificsealant to a specific EIFS substrate.6.2.6 Careful consideration should be given to the construc-tion sequencing of the EIFS finish coat, EIFS primer or pa
42、intcoating, and sealant application as well as the termination ofthe EIFS finish coat relative to the joint.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 cleaned with a nonmetallicstiff bristle brush or oil
43、-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.6.3.3 Repair deteriorated or damaged substrates as recom-mended by the manufacturer to provide a suitab
44、le substrate forthe sealant.7. Sealant Primer7.1 The general purpose of a sealant primer is to improveadhesion of a sealant to the EIFS substrate.7.1.1 In accordance with Test Methods C794 and C1382,determine whether a sealant primer is required to a specificEIFS substrate or accessory.7.1.2 Sealant
45、 primer shall not cause damage to the EIFSlamina and underlying thermal insulation board.7.1.3 When selecting a sealant for joints between EIFS anda dissimilar substrate, two different primers may be required.This poses a difficult application problem and should be takeninto consideration when selec
46、ting 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 manufacturer beforeinstalling sealant backing and sealant.8. Sealant Backing or Bond Breaker8.1 Proper joint design requires the use
47、of appropriatesealant backing to prevent three-sided adhesion, allow toolingof the sealant and control joint profile. Closed cell andbicellular sealant backings are generally accepted by EIFSmanufacturers. Open cell sealant backing, such as open cellpolyurethane, can absorb and retain water, which m
48、ay 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 three sided adhesion.C1481 12 (2017)49. Sealant9.1 The sealant shall be selected based on the environmentalconditions in whi
49、ch it will be used. Test Method C1382evaluates the performance of sealants with EIFS in a variety ofconditions. Results of this test provide information to thedesign professional as to which sealant may be the mostappropriate for its end use.9.1.1 Sealant types and classifications are discussed inGuide C1193.9.1.2 Section 10.1.4 on Self-Leveling of Guide C1193 doesnot apply.9.1.3 Section 10.10.5 on Tooling Liquids of Guide C1193does not apply when sealants are used with EIFS.9.2 The EIFS industry generally recommends the use of alow modulus sealant. Refer to the EIFS m
