1、Designation: C1481 11Standard 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 revision, the year of l
2、ast 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 sealantsystems for
3、 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,orC1311.1.3 The value
4、s 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 appro-priate safe
5、ty 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 Adhesion and Cohesi
6、on of Elasto-meric Joint Sealants Under Cyclic Movement (HockmanCycle)C794 Test Method for Adhesion-in-Peel of ElastomericJoint SealantsC834 Specification for Latex SealantsC920 Specification for Elastomeric Joint SealantsC1193 Guide for Use of Joint SealantsC1311 Specification for Solvent Release S
7、ealantsC1382 Test Method for Determining Tensile AdhesionProperties of Sealants When Used in Exterior Insulationand Finish Systems (EIFS) JointsC1397 Practice for Application of Class PB Exterior Insu-lation and Finish Systems (EIFS) and EIFS with DrainageC1472 Guide for Calculating Movement and Oth
8、er EffectsWhen Establishing Sealant Joint WidthE2110 Terminology for Exterior Insulation and Finish Sys-tems (EIFS)E2511 Guide for Detailing of EIFS-Clad Wall AssembliesE2568 Specification for PB Exterior Insulation and FinishSystems2.2 ANSI Standard:American National Standard for Exterior Insulatio
9、n 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, closed cell sealant backing, compatibility
10、,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 sealant, shrinkage, substrate, tooling, tooli
11、ng 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 coat,lamina, nonmetallic reinforcing mesh, p
12、rimers, 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 ofjoint seals in, or adjacent to, EIFS. Refer to SpecificationE2568 for addition
13、al information pertaining to specifying ClassPB EIFS. Refer to Guide E2511 for additional informationpertaining to detailing of EIFS-Clad Wall Assemblies.1This guide is under the jurisdiction ofASTM Committee C24 on Building Sealsand Sealants and is the direct responsibility of Subcommittee C24.10 o
14、n Specifi-cations, Guides and Practices.Current edition approved July 1, 2011. Published August 2011. Originallyapproved in 2000. Last previous edition approved in 2006 as C1481-00(2006). DOI:10.1520/C1481-11.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Custom
15、er 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 Institute (ANSI), 25 W. 43rd St.,4th Floor, New York, NY 10036.1Copyright ASTM International, 100 Barr Harbo
16、r Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.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 performancefactors should be designed for the particular app
17、lication 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 their proper use and installation.5. General5.1 The majo
18、r 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).NOTEThis legend applies to Figs. 1-11LegendA. SealantB. Sealant BackingC. Bond
19、 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. Precured SealantN. Existing Sealant Joint with OptionalCut
20、 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 seal-ant directly to the base coat or primed base coat a
21、nd 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 will have alower stress at the sealant and substrate interf
22、ace when the jointis in extension.5.3 Due 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 E
23、IFS system is water-based, ifit becomes saturated 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 seala
24、nt removal, so it is a goodcandidate for 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 Configura
25、tionIn an EIFS-cladbuilding, sealant joints typically are required at the followinglocations: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 A
26、ccessory)C1481 1126.1.1 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 may require movementjoints in long
27、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 width for EIFS applications is 19 mm
28、 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 width. Refer to Guide C1472 forFIG.
29、 5 Sealant Butt Joint Seal (Accessory to DissimilarSubstrate)FIG. 6 Sealant Bridge Joint Seal Using LiquidApplied Sealantand 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 B
30、ackingFIG. 10 Sealant Fillet Joint Seal Using Precured SealantFIG. 11 Sealant Lap Joint SealC1481 113additional information on establishing the sealant joint size.Good architectural practice calls for joint designs that allow forconstruction tolerances and material variations.6.2 EIFS InstallationTh
31、e EIFS manufacturers recom-mended installation procedures should be followed 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 w
32、ith base coat and reinforcing mesh, trim accessory, orother method specified 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
33、 mesh at joint locations or elsewhere.6.2.2.2 EIFS manufacturers may require 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
34、 the lamina for the EIFS mustbe allowed sufficient time to cure or dry 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 ma
35、nufacturer for recommen-dations for appropriate curing/drying time.6.2.4 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-ce
36、nce and/or provide color uniformity.6.2.5 The application of finish coat 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
37、the construc-tion sequencing of the EIFS finish coat, EIFS primer or paintcoating, 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 Generall
38、y, joints shall be cleaned 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.6.3.3 Repair deteriorated or dam
39、aged substrates as recom-mended by the manufacturer to provide a suitable 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 pr
40、imer is required to a specificEIFS substrate or accessory.7.1.2 Sealant 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 difficu
41、lt application problem and should be takeninto consideration 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 manufacturer beforeinstalling sealant backing and sealant.8. S
42、ealant 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 accepted by EIFSmanufacturers. Open cell sealant backi
43、ng, such as open cellpolyurethane, can absorb and retain 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 three sided adhesion.9. Sealant9.1 The sealant shall
44、be selected based on the environmentalconditions in which 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
45、.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 modulu
46、s sealant. Refer to the EIFS manufacturer for therecommended elongation and compression capability.9.3 The selection of the sealant to be used is the responsi-bility of the design professional and shall be consistent withproject conditions and guidelines of the EIFS manufacturer.See Guide C1472 for
47、guidance.10. Joint 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 for any joint seal geometry type.10.2 A butt joint is the most common type
48、 of sealant jointseal and may be used at EIFS to EIFS (Fig. 1) and joints whereEIFS abuts dissimilar materials (Fig. 2). To allow for potentialsealant joint restoration should the first sealant joint fail,consider installing the sealant recessed from the outboardsurface of the EIFS cladding (Fig. 3)
49、. Test Method C1382specifically evaluates performance of a sealant with EIFS in asimilar joint seal geometry.10.3 A sealant bridge joint seal is sometimes used to restorean existing sealant joint seal without removal of the existingC1481 114sealant joint but also may be used in new construction. Thesealant of a bridge joint seal may be in the form of aliquid-applied sealant (Fig. 6) or a precured sealant joint seal(Fig. 7). The old sealant may be cut down the middle beforeinstalling the bridge joint seal.Abond breaker material shall beinstalled prior to applying the wet
