ASTM C1535-02
(Practice)Standard Practice for Application of Exterior Insulation and Finish Systems Class PI
Standard Practice for Application of Exterior Insulation and Finish Systems Class PI
SCOPE
1.1 This practice covers the minimum requirements and procedures for field or prefabricated application of Class PI Exterior Insulation and Finish Systems (EIFS). Class PI EIFS are systems applied over polyisocyanurate insulation board, in which the base coat ranges from not less than 1/16 in. (1.6 mm) to 1/4 in. (6.4 mm) in dry thickness, depending upon the number of nonmetallic reinforcing mesh layers encapsulated in the base coat. The base coat is then covered with a finish coat of various thickness in a variety of textures and colors. The insulation board shall be applied over a substrate or over open framing.
1.2 This practice does not cover Class PI EIFS with drainage. Consult the EIFS producer for information.
1.3 The values stated in inch-pound units are to be regarded as the standard. The SI (metric) values given in parentheses are approximate and are provided for information purposes only.
1.4 The text of this standard references notes and footnotes that provide explanatory material. These notes and footnotes shall not be considered as requirements of the standard.
1.5 This standard may involve hazardous materials, operations and equipment. This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
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Standards Content (Sample)
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Designation: C 1535 – 02
Standard Practice for
Application of Exterior Insulation and Finish Systems Class
PI
This standard is issued under the fixed designation C 1535; 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 (e) indicates an editorial change since the last revision or reapproval.
1. Scope C 1177 Specification for Glass Mat Gypsum Substrate for
Use as Sheathing
1.1 This practice covers the minimum requirements and
C 1186 Specification for Flat Non-Asbestos Fiber-Cement
procedures for field or prefabricated application of Class PI
Sheets
Exterior Insulation and Finish Systems (EIFS). Class PI EIFS
C 1278/C 1278M Specification for Fiber-Reinforced Gyp-
are systems applied over polyisocyanurate insulation board, in
1 sum Panels
which the base coat ranges from not less than ⁄16 in. (1.6 mm)
1 C 1280 Specification for Application of Gypsum Board
to ⁄4 in. (6.4 mm) in dry thickness, depending upon the number
C 1289 Specification for Faced Rigid Cellular Polyisocya-
of nonmetallic reinforcing mesh layers encapsulated in the base
nurate Thermal Insulation Board
coat. The base coat is then covered with a finish coat of various
C 1382 Test Method for Determining Tensile Adhesion
thickness in a variety of textures and colors. The insulation
Properties of Sealants When Used in Exterior Insulation
board shall be applied over a substrate or over open framing.
and Finish Systems (EIFS) Joints
1.2 This practice does not cover Class PI EIFS with drain-
C 1472 Guide for Calculating Movement and Other Effects
age. Consult the EIFS producer for information.
When Establishing Sealant Joint Width
1.3 The values stated in inch-pound units are to be regarded
C 1481 Guide for Use of Joint Sealants with Exterior
as the standard. The SI (metric) values given in parentheses are
Insulation and Finish Systems (EIFS)
approximate and are provided for information purposes only.
E 1825 Guide for Evaluation of Exterior Building Wall
1.4 The text of this standard references notes and footnotes
Materials, Products and Systems
that provide explanatory material. These notes and footnotes
E 2110 Terminology for Exterior Insulation and Finish Sys-
shall not be considered as requirements of the standard.
tems (EIFS)
1.5 This standard may involve hazardous materials, opera-
tions and equipment. This standard does not purport to address
3. Terminology
all of the safety concerns, if any, associated with its use. It is
3.1 Definitions used in this standard shall be in accordance
the responsibility of the user of this standard to establish
with Terminologies C 11 and E 2110.
appropriate safety and health practices and determine the
applicability of regulatory limitations prior to use.
4. Significance and Use
4.1 This practice provides minimum requirements for the
2. Referenced Documents
application of Class PI EIFS. The requirements for materials,
2.1 ASTM Standards:
mixtures, and details shall be contained in the project plans and
C 11 Terminology Relating to Gypsum and Related Build-
2 specifications. See Guide E 1825 for guidance.
ing Materials and Systems
C 79/C 79M Specification for Treated Core and Nontreated
5. Delivery of Materials
Core Gypsum Sheathing Board
5.1 All materials shall be delivered in packages, containers,
C 150 Specification for Portland Cement
or bundles with the identification and markings intact.
C 1063 Specification for Installation of Lathing and Furring
to Receive Interior and Exterior Portland Cement-Based
6. Inspection
Plaster
6.1 Inspection of the materials shall be agreed upon and be
a part of the purchase agreement.
This practice is under the jurisdiction of ASTM Committee C11 on Gypsum
and Related Building Materials and Systems and is the direct responsibility of Annual Book of ASTM Standards, Vol 04.05.
Subcommittee C11.05 on Application of Exterior Insulating and Finish Systems and Annual Book of ASTM Standards, Vol 04.06.
Related Products. Annual Book of ASTM Standards, Vol 04.07.
Current edition approved June 10, 2002. Published July 2002. Annual Book of ASTM Standards, Vol 04.02.
2 7
Annual Book of ASTM Standards, Vol 04.01. Annual Book of ASTM Standards, Vol 04.12.
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NOTICE: This standard has either been superceded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
C 1535
6.2 Inspection shall include the determination that the ma- 11. Assessment of Condition of Substrates to Receive
terials supplied are as required for the Class PI EIF System Exterior Insulation and Finish Systems
specified. Mixing of materials from different manufacturers is
11.1 The substrate shall be as required by the project plans
not allowed.
and specifications and as recommended by the EIFS producer
for the particular system specified.
7. Rejection
11.1.1 Polyisocyanurate boards for use over open framing in
7.1 Materials that are damaged, frozen or defective shall not
conformance with the EIFS producer’s specification shall not
be used. Rejection of materials shall be promptly reported
be less than 1.0 in. (25.4 mm) in thickness.
verbally to the producer and immediately reported in writing.
11.1.2 Polyisocyanurate boards for use over a substrate 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 ⁄8 in. (15.9 mm) in thickness.
8. Certification
11.1.3 Discussion—Polyisocyanurate board thickness shall
conform to building code requirements.
8.1 When specified in the contract documents, the producer
shall furnish a report certifying that the materials are in 11.2 The substrate shall be inspected by the applicator and
general contractor to assure that it meets the project plans and
conformance with product and material standards and contract
documents. specifications and the requirements of 11.3-11.8.
8.2 Insulation Boards: 11.3 Sheathing materials shall be inspected to ensure the
8.2.1 Insulation boards shall be in compliance with Speci- following:
fication C 1289 , Type II, Class 2.
11.3.1 The specified sheathing thickness has been installed
8.2.2 Insulation boards shall have been subjected to a third for the stud spacing used.
party quality control inspection and shall be marked as
11.3.2 Fastener type and fastener spacing are as specified.
approved for use within the EIFS and in accordance with
11.3.3 All Specification C 79/C 79M gypsum sheathing
applicable building code.
boards have a water-resistant treated core.
8.2.3 Prior to installation, the insulation board shall be
11.3.4 Tongue and groove water-resistant core gypsum
inspected for conformance with contract documents. Noncon-
sheathing boards conforming to Specification C 79/C 79M are
forming insulation board shall not be used.
installed with the tongue edge oriented to the top.
8.2.4 The insulation board producer shall furnish, for each
11.3.5 Gypsum sheathing shall be installed with the face
shipment, a written certificate of conformance with the EIFS
paper exposed in accordance with Specification C 1280.
producer’s specifications.
11.3.6 Gypsum sheathing shall be protected from moisture
at all penetrations and terminations.
9. Storage of Materials
11.3.7 Glass mat gypsum sheathing complying with Speci-
9.1 All materials shall be kept dry by storage under cover
fication C 1177 shall be installed in accordance with the
and protected from the weather. When outside storage is
sheathing producer’s written installation instructions, which
required, materials shall be stacked off the ground, supported
include details of framing type and spacing, fastener type and
on a level platform and protected from the weather, surface
spacing, and sheathing orientation and spacing.
contamination or physical damage in accordance with the EIFS
11.3.8 Plywood shall be not less than ⁄2 in. (12.7 mm)
producer’s written instructions.
nominal in thickness, exterior or exposure 1 panel sheathing.
9.2 Materials shall be protected from exposure to direct
The plywood shall be installed with a ⁄8 in. (3.2 mm) space
sunlight and temperatures less than 40°F (4°C) unless other-
between sheets at edges and ends.
wise specified by the manufacturer.
11.3.9 Fiber-Cement sheets complying with Specification
9.3 Portland Cement shall meet Specification C 150 and
C 1186, Type A, shall be installed in accordance with the sheet
shall be kept dry until ready for use. It shall be kept off the
producer’s written installation instructions, which include de-
ground, under cover and away from damp walls and surfaces.
tails of stud type and spacing, fastener type and spacing, and
9.4 Insulation board shall be stacked flat with care taken to
sheet spacing recommendations.
avoid damage to edges, ends, or surfaces; or exposure to direct
11.3.10 Water-resistant exterior fiber-reinforced gypsum
sunlight (ultraviolet radiation).
sheathing complying with Specification C 1278/C 1278M shall
10. Environmental Conditions
be installed in accordance with the sheathing producer’s
written installation instructions, which include details of fram-
10.1 Cold Weather Conditions:
ing type and spacing, fastener type and spacing, and sheathing
10.1.1 Wet materials shall not be applied when the tempera-
orientation and spacing.
ture is less than 40° F (4°C) unless otherwise specified by the
11.3.11 Sheathing shall be continuous.
manufacturer or unless temporary heat and enclosures are
11.4 Alignment—All substrate surfaces shall be straight and
provided to maintain minimum 40°F (4°C) for a minimum
true within ⁄4 in./10 ft (2 mm/m). More stringent requirements
period of not less than 24 hours before, during and after
by the EIFS producer shall supersede the above stated require-
application. (See X1.8.3)
ments.
10.1.2 Materials shall not be applied to a base containing
11.5 Suitability for Use—The substrate shall be firm, sound,
frost. Substrate surface temperature shall be not less than 40°F
(4°C). Mixtures for application shall not contain any frozen and undamaged in order to receive the EIFS.
ingredients. 11.6 Cleanliness—The surface of all substrates shall be
NOTICE: This standard has either been superceded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
C 1535
clean and free from any foreign materials such as paint, form the face or core of insulation board.
release agents, curing compounds, dust, dirt, frost, oil or
14. Aesthetic Reveals
grease, efflorescence and laitance that would affect the EIFS
application. 14.1 Aesthetic reveals shall be cut into the insulation board
prior to applying the reinforcing mesh.
11.7 Dryness:
11.7.1 Newly constructed concrete or masonry surfaces 14.2 The insulation board thickness at the bottom of a reveal
shall be not less than ⁄4 in. (19.0 mm). Over open framing,
shall be allowed to cure not less than 28 days prior to
aesthetic reveals shall occur over framing or blocking.
application of the EIFS. Repaired areas on existing (aged)
14.3 Aesthetic reveals shall be cut true and straight.
walls shall meet the same 28-day curing time.
14.4 Horizontal aesthetic reveal configuration shall provide
11.7.2 Substrate surfaces shall be free of visible water.
for outward positive drainage.
11.8 Metal Lath or Furring and Accessories—If metal lath
14.5 Aesthetic reveals shall not occur at the abutment of two
or furring and accessories are used, they shall be installed in
pieces of insulation board.
conformance with Specification C 1063, except lath edges and
14.6 The reveal shall be reinforced with base coat and
ends shall be butted and not lapped. Metal lath shall be 3.4
reinforcing mesh prior to application of the full base coat and
lb/yd (1.3 kg/m ) self-furring, galvanized.
reinforcing mesh.
11.8.1 Metal members shall be properly attached, straight,
and true unless otherwise required by the system design.
15. Reinforced Base Coat Application
11.8.2 Metal members shall be free of rust, oil, or other
15.1 Inspect the insulation board surface to ensure that it is
foreign matter or contaminants, which cause bond failure or
clean, dry, free of all foreign materials, and damage of any
unsightly discoloration.
type. Insulation board planar irregularities of more than ⁄16 in.
12. Insulation Board Installation
(1.6 mm) shall be corrected. All board joints shall be tightly
abutted or shall be filled with an insulating material.
12.1 Method of Attachment shall be approved by the
15.2 Base Coat Preparation—All materials requiring field
system producer and be in accordance with applicable building
preparation shall be mixed in accordance with the EIFS
code.
producer’s specifications.
12.2 Mechanical Attachment Method:
15.3 Base Coat Application—The prepared base coat shall
12.2.1 Mechanical fasteners shall be installed into the fram-
be uniformly spread over the entire surface of the insulation
ing or nailable substrate.
12.2.2 Mechanical fasteners shall be corrosion resistant. board.
15.4 Non Metallic Reinforcing Mesh—The single layer
Fastener type and spacing shall be in accordance with system
producer’s current published instructions. reinforcing mesh shall be fully encapsulated in the field of the
wall, at corners, edges, and joints. Trowel from the center to the
12.2.3 Discussion—Specific consideration of building code
edge of the reinforcing mesh to avoid wrinkles. The single
wind load requirements shall be given for mechanically fas-
layer reinforcing mesh shall be continuous at all corners.
tened systems.
15.4.1 The surface shall be free of voids, projections, trowel
13. General Requirements
marks and other surface irregularities. The base coat thickness
13.1 Insulation boards shall be placed from a level base line shall be not less than ⁄16 in. (1.6 mm) dry as measured from the
with vertical joints staggered in a running bond pattern and surface of the insulation board. The base coat shall be applied
butted tightly. Over open framing, joints shall occur over in two applications unless otherwise recommended by the
framing or horizontal blocking. EIFS’s producer.
13.2 Insulation board joints at all inside and outside corners 15.4.2 Discussion—The recommended method is to apply
shall be staggered and interlocked. the base coat in two applications.
13.3 Insulation boards must abut without gaps, eliminating 15.5 Reinforcing Mesh Overlap—All reinforcing mesh
space for base coat intrusion bet
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