ASTM C1535-05(2017)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: C1535 − 05 (Reapproved 2017)
Standard Practice for
Application of Exterior Insulation and Finish Systems Class
PI
This standard is issued under the fixed designation C1535; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope* 2. Referenced Documents
2.1 ASTM Standards:
1.1 This practice covers the minimum requirements and
C11 Terminology Relating to Gypsum and Related Building
procedures for field or prefabricated application of Class PI
Materials and Systems
Exterior Insulation and Finish Systems (EIFS). Class PI EIFS
C79/C79M Specification for Gypsum Sheathing Board
are systems applied over polyisocyanurate insulation board, in
(Withdrawn 2004)
which the base coat ranges from not less than ⁄16 in. (1.6 mm)
C150 Specification for Portland Cement
to ⁄4 in. (6.4 mm) in dry thickness, depending upon the number
C1063 Specification for Installation of Lathing and Furring
of nonmetallic reinforcing mesh layers encapsulated in the base
to Receive Interior and Exterior Portland Cement-Based
coat. The base coat is then covered with a finish coat of various
Plaster
thickness in a variety of textures and colors. The insulation
C1177/C1177M Specification for Glass Mat Gypsum Sub-
board shall be applied over a substrate or over open framing.
strate for Use as Sheathing
C1186 Specification for Flat Fiber-Cement Sheets
1.2 This practice does not cover Class PI EIFS with drain-
C1278/C1278M Specification for Fiber-Reinforced Gypsum
age. Consult the EIFS producer for information.
Panel
1.3 The values stated in inch-pound units are to be regarded
C1280 Specification for Application of Exterior Gypsum
as the standard. The SI (metric) values given in parentheses are
Panel Products for Use as Sheathing
approximate and are provided for information purposes only.
C1289 Specification for Faced Rigid Cellular Polyisocyanu-
rate Thermal Insulation Board
1.4 The text of this standard references notes and footnotes
C1325 Specification for Non-Asbestos Fiber-Mat Rein-
that provide explanatory material. These notes and footnotes
forced Cementitious Backer Units
shall not be considered as requirements of the standard.
C1382 Test Method for Determining Tensile Adhesion Prop-
1.5 This standard may involve hazardous materials, opera-
erties of Sealants When Used in Exterior Insulation and
tions and equipment. This standard does not purport to address Finish Systems (EIFS) Joints
all of the safety concerns, if any, associated with its use. It is C1472 Guide for Calculating Movement and Other Effects
When Establishing Sealant Joint Width
the responsibility of the user of this standard to establish
C1481 Guide for Use of Joint Sealants with Exterior Insu-
appropriate safety and health practices and determine the
lation and Finish Systems (EIFS)
applicability of regulatory limitations prior to use.
E1825 Guide for Evaluation of Exterior Building Wall
1.6 This international standard was developed in accor-
Materials, Products, and Systems
dance with internationally recognized principles on standard-
E2110 Terminology for Exterior Insulation and Finish Sys-
ization established in the Decision on Principles for the
tems (EIFS)
Development of International Standards, Guides and Recom-
mendations issued by the World Trade Organization Technical
3. Terminology
Barriers to Trade (TBT) Committee.
3.1 Definitions used in this standard shall be in accordance
with Terminologies C11 and E2110.
This practice is under the jurisdiction of ASTM Committee C11 on Gypsum
and Related Building Materials and Systems and is the direct responsibility of For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Subcommittee C11.05 on Application of Exterior Insulating and Finish Systems and contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Related Products. Standards volume information, refer to the standard’s Document Summary page on
Current edition approved April 1, 2017. Published April 2017. Originally the ASTM website.
approved in 2002. Last previous edition approved in 2005 as C1535 – 05 (2011). The last approved version of this historical standard is referenced on
DOI: 10.1520/C1535-05R17. www.astm.org.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
C1535 − 05 (2017)
4. Significance and Use 9.4 Insulation board shall be stacked flat with care taken to
avoid damage to edges, ends, or surfaces; or exposure to direct
4.1 This practice provides minimum requirements for the
sunlight (ultraviolet radiation).
application of Class PI EIFS. The requirements for materials,
mixtures, and details shall be contained in the project plans and
10. Environmental Conditions
specifications. See Guide E1825 for guidance.
10.1 Cold Weather Conditions:
5. Delivery of Materials 10.1.1 Wet materials shall not be applied when the tempera-
ture is less than 40°F (4°C) unless otherwise specified by the
5.1 All materials shall be delivered in packages, containers,
manufacturer or unless temporary heat and enclosures are
or bundles with the identification and markings intact.
provided to maintain minimum 40°F (4°C) for a minimum
period of not less than 24 hours before, during and after
6. Inspection
application. (See X1.8.3)
6.1 Inspection of the materials shall be agreed upon and be
10.1.2 Materials shall not be applied to a base containing
a part of the purchase agreement.
frost. Substrate surface temperature shall be not less than 40°F
6.2 Inspection shall include the determination that the ma-
(4°C). Mixtures for application shall not contain any frozen
terials supplied are as required for the Class PI EIF System
ingredients.
specified. Mixing of materials from different manufacturers is
11. Assessment of Condition of Substrates to Receive
not allowed.
Exterior Insulation and Finish Systems
7. Rejection
11.1 The substrate shall be as required by the project plans
7.1 Materials that are damaged, frozen or defective shall not
and specifications and as recommended by the EIFS producer
be used. Rejection of materials shall be promptly reported
for the particular system specified.
verbally to the producer and immediately reported in writing.
11.1.1 Polyisocyanurate boards for use over open framing in
The notice of rejection shall contain a statement documenting
conformance with the EIFS producer’s specification shall not
the basis for material rejection.
be less than 1.0 in. (25.4 mm) in thickness.
11.1.2 Polyisocyanurate boards for use over a substrate in
8. Certification
conformance with the EIFS producer’s specification shall not
8.1 When specified in the contract documents, the producer 5
be less than ⁄8 in. (15.9 mm) in thickness.
shall furnish a report certifying that the materials are in
NOTE 1—Polyisocyanurate board thickness shall conform to building
conformance with product and material standards and contract
code requirements.
documents.
11.2 The substrate shall be inspected by the applicator and
8.2 Insulation Boards:
general contractor to assure that it meets the project plans and
8.2.1 Insulation boards shall be in compliance with Speci-
specifications and the requirements of 11.3 – 11.8.
fication C1289 , Type II, Class 2.
11.3 Sheathing materials shall be inspected to ensure the
8.2.2 Insulation boards shall have been subjected to a third
following:
party quality control inspection and shall be marked as
11.3.1 The specified sheathing thickness has been installed
approved for use within the EIFS and in accordance with
for the stud spacing used.
applicable building code.
11.3.2 Fastener type and fastener spacing are as specified.
8.2.3 Prior to installation, the insulation board shall be
11.3.3 All Specification C79/C79M gypsum sheathing
inspected for conformance with contract documents. Noncon-
boards have a water-resistant treated core.
forming insulation board shall not be used.
11.3.4 Tongue and groove water-resistant core gypsum
8.2.4 The insulation board producer shall furnish, for each
sheathing boards conforming to Specification C79/C79M are
shipment, a written certificate of conformance with the EIFS
installed with the tongue edge oriented to the top.
producer’s specifications.
11.3.5 Gypsum sheathing shall be installed with the face
9. Storage of Materials paper exposed in accordance with Specification C1280.
11.3.6 Gypsum sheathing shall be protected from moisture
9.1 All materials shall be kept dry by storage under cover
at all penetrations and terminations.
and protected from the weather. When outside storage is
11.3.7 Glass mat gypsum sheathing complying with Speci-
required, materials shall be stacked off the ground, supported
fication C1177/C1177M shall be installed in accordance with
on a level platform and protected from the weather, surface
the sheathing producer’s written installation instructions,
contamination or physical damage in accordance with the EIFS
which include details of framing type and spacing, fastener
producer’s written instructions.
type and spacing, and sheathing orientation and spacing.
9.2 Materials shall be protected from exposure to direct
11.3.8 Plywood shall be not less than ⁄2 in. (12.7 mm)
sunlight and temperatures less than 40°F (4°C) unless other-
nominal in thickness, exterior or exposure 1 panel sheathing.
wise specified by the manufacturer.
The plywood shall be installed with a ⁄8 in. (3.2 mm) space
9.3 Portland Cement shall meet Specification C150 and between sheets at edges and ends.
shall be kept dry until ready for use. It shall be kept off the 11.3.9 Fiber-Cement sheets complying with Specification
ground, under cover and away from damp walls and surfaces. C1186, Type A, shall be installed in accordance with the sheet
C1535 − 05 (2017)
producer’s written installation instructions, which include de- 12.3 Placement of a weather resistive barrier, if specified,
tails of stud type and spacing, fastener type and spacing, and shall be as required by the system producer.
sheet spacing recommendations.
11.3.10 Water-resistant exterior fiber-reinforced gypsum 13. General Requirements
sheathing complying with Specification C1278/C1278M shall
13.1 Insulation boards shall be placed from a level base line
be installed in accordance with the sheathing producer’s
with vertical joints staggered in a running bond pattern and
written installation instructions, which include details of fram-
butted tightly. Over open framing, joints shall occur over
ing type and spacing, fastener type and spacing, and sheathing
framing or horizontal blocking.
orientation and spacing.
13.2 Insulation board joints at all inside and outside corners
11.3.11 Fiber-mat reinforced cement sheets complying with
shall be staggered and interlocked.
Specification C1325, type A, shall be installed in accordance
with the sheet producer’s written installation instructions,
13.3 Insulation boards must abut without gaps, eliminating
which include details of framing type and spacing, fastener
space for base coat intrusion between the board edges and
type and spacing, and sheet orientation and spacing.
ends.
11.3.12 Sheathing shall be continuous.
13.4 Fenestration opening corners and other wall penetra-
11.4 Alignment—All substrate surfaces shall be straight and
tions shall be cut out of a single insulation board. Board joints
true within ⁄4 in./10 ft (2 mm/m). More stringent requirements
shall not be aligned at corners with head, sill or jambs of
by the EIFS producer shall supersede the above stated require-
windows, doors, similar openings, and aesthetic reveals.
ments.
13.5 Mechanically Fastened:
11.5 Suitability for Use—The substrate shall be firm, sound,
13.5.1 Insulation board joints shall be offset from sheathing
and undamaged in order to receive the EIFS.
board joints.
13.5.2 When the boards are attached only with mechanical
11.6 Cleanliness—The surface of all substrates shall be
fasteners, they shall be affixed to a nailable substrate or
clean and free from any foreign materials such as paint, form
structural members with the proper fasteners, ensuring that all
release agents, curing compounds, dust, dirt, frost, oil or
boards abut tightly. Fastening pattern shall be in accordance
grease, efflorescence and laitance that would affect the EIFS
with the EIFS producer’s recommendation and local building
application.
code requirements. When installed, the washer shall be left
11.7 Dryness:
flush with the face of the insulation board and shall not fracture
11.7.1 Newly constructed concrete or masonry surfaces
the face or core of insulation board.
shall be allowed to cure not less than 28 days prior to
application of the EIFS. Repaired areas on existing (aged)
14. Aesthetic Reveals
walls shall meet the same 28-day curing time.
14.1 Aesthetic reveals shall be cut into the insulation board
11.7.2 Substrate surfaces shall be free of visible water.
prior to applying the reinforcing mesh.
11.8 Metal Lath or Furring and Accessories—If metal lath
14.2 The insulation board thickness at the bottom of a reveal
or furring and accessories are used, they shall be installed in
shall be not less than ⁄4 in. (19.0 mm). Over open framing,
conformance with Specification C1063, except lath edges and
aesthetic reveals shall occur over framing or blocking.
ends shall be butted and not lapped. Metal lath shall be 3.4
lb/yd (1.3 kg/m ) self-furring, galvanized.
14.3 Aesthetic reveals shall be cut true and straight.
11.8.1 Metal members shall be properly attached, straight,
14.4 Horizontal aesthetic reveal configuration shall provide
and true unless otherwise required by the system design.
for outward positive drainage.
11.8.2 Metal members shall be free of rust, oil, or other
14.5 Aesthetic reveals shall not occur at the abutment of two
foreign matter or contaminants, which cause bond failure or
unsightly discoloration. pieces of insulation board.
14.6 The reveal shall be reinforced with base coat and
12. Insulation Board Installation
reinforcing mesh prior to application of the full base coat and
reinforcing mesh.
12.1 Method of Attachment shall be approved by the
system producer and be in accordance with applicable building
code. 15. Reinforced Base Coat Application
12.2 Mechanical Attachment Method: 15.1 Inspect the insulation board surface to ensure that it is
12.2.1 Mechanical fasteners shall be installed into the fram- clean, dry, free of all foreign
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