ASTM C1397-13(2019)

Standard Practice for Application of Class PB Exterior Insulation and Finish Systems (EIFS) and EIFS with Drainage

SIGNIFICANCE AND USE
4.1 This practice provides minimum requirements for the application of Class PB EIFS and EIFS with Drainage (see Specification E2568). The requirements for materials, mixtures, and details shall be contained in the project plans and specifications. See Guide E1825 for guidance.
SCOPE
1.1 This practice covers the minimum requirements and procedures for field or prefabricated application of Class PB Exterior Insulation and Finish Systems (EIFS) and EIFS with Drainage. Class PB EIFS are systems applied over 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 (see Specification E2568). The base coat is then covered with a finish coat of varying thickness in a variety of textures and colors. EIFS with Drainage provides a mechanism to drain incidental moisture  
1.2 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.  
1.3 The text of this practice references notes and footnotes which provide explanatory material. These notes and footnotes (excluding those in tables and figures) shall not be considered as a requirement of the standard.  
1.4 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

General Information

• Status: Published
• Publication Date: 28-Feb-2019
• ICS: 91.100.99 - Other construction materials
• Technical Committee: C11 - Gypsum and Related Building Materials and Systems
• Drafting Committee: C11.05 - Application of Exterior Insulating and Finish Systems and Related Products

Relations

• Replaces: ASTM C1397-13 - Standard Practice for Application of Class PB Exterior Insulation and Finish Systems (EIFS) and EIFS with Drainage
• Effective Date: 01-Mar-2019
• Refers: ASTM C1177/C1177M-24 - Standard Specification for Glass Mat Gypsum Substrate for Use as Sheathing
• Effective Date: 01-Apr-2024
• Refers: ASTM C1280-18(2023) - Standard Specification for Application of Exterior Gypsum Panel Products for Use as Sheathing
• Effective Date: 01-Oct-2023
• Refers: ASTM C1063-19a - Standard Specification for Installation of Lathing and Furring to Receive Interior and Exterior Portland Cement-Based Plaster
• Effective Date: 01-Mar-2019
• Refers: ASTM C1063-19 - Standard Specification for Installation of Lathing and Furring to Receive Interior and Exterior Portland Cement-Based Plaster
• Effective Date: 01-Feb-2019
• Refers: ASTM C1280-18 - Standard Specification for Application of Exterior Gypsum Panel Products for Use as Sheathing
• Effective Date: 01-Nov-2018
• Refers: ASTM C11-18a - Standard Terminology Relating to Gypsum and Related Building Materials and Systems
• Effective Date: 01-Oct-2018
• Refers: ASTM C11-18 - Standard Terminology Relating to Gypsum and Related Building Materials and Systems
• Effective Date: 01-Jun-2018
• Refers: ASTM C1063-18b - Standard Specification for Installation of Lathing and Furring to Receive Interior and Exterior Portland Cement-Based Plaster
• Effective Date: 01-Jun-2018
• Refers: ASTM C1063-18a - Standard Specification for Installation of Lathing and Furring to Receive Interior and Exterior Portland Cement-Based Plaster
• Effective Date: 01-Apr-2018
• Refers: ASTM C1063-18 - Standard Specification for Installation of Lathing and Furring to Receive Interior and Exterior Portland Cement-Based Plaster
• Effective Date: 01-Jan-2018
• Refers: ASTM C1063-17b - Standard Specification for Installation of Lathing and Furring to Receive Interior and Exterior Portland Cement-Based Plaster
• Effective Date: 01-Dec-2017
• Refers: ASTM C1177/C1177M-17 - Standard Specification for Glass Mat Gypsum Substrate for Use as Sheathing
• Effective Date: 01-Dec-2017
• Refers: ASTM C11-17a - Standard Terminology Relating to Gypsum and Related Building Materials and Systems
• Effective Date: 01-Oct-2017
• Refers: ASTM C1063-17a - Standard Specification for Installation of Lathing and Furring to Receive Interior and Exterior Portland Cement-Based Plaster
• Effective Date: 01-Jun-2017

Overview

ASTM C1397-13(2019) defines the standard practice for the application of Class PB (Polymer-based) Exterior Insulation and Finish Systems (EIFS) and EIFS with Drainage. Issued by ASTM International, this standard establishes minimum requirements and procedures for both field and prefabricated installations of these widely used wall cladding systems. Class PB EIFS are multi-layered systems applied over insulation boards, with a base coat reinforced with mesh and finished in various textures and colors. The inclusion of drainage functionality ensures management of incidental moisture, crucial for maintaining durable, energy-efficient, and weather-resistant building envelopes.

Key Topics

• Scope and Purpose:
  Sets minimum requirements for Class PB EIFS and EIFS with Drainage applications. Covers both new construction and prefabricated systems, focusing on installation procedures, material requirements, and quality control.

• Substrate and Material Requirements:
  Highlights the need for proper substrate preparation-including alignment, cleanliness, and firmness-and strict adherence to project plans and manufacturer recommendations for materials and installation methods.

• Attachment Methods:
  Details acceptable ways to attach insulation boards, such as adhesive, mechanical, or combined methods, depending on substrate type and project requirements.

• Water Management:
  Addresses the need for water-resistive barriers (WRB) and integrated drainage systems for managing moisture, emphasizing compatibility and continuous drainage capability.

• Reinforcement and Finishing:
  Provides guidelines for embedding mesh in the base coat, correct installation of finish coats, treatment of joints, and the handling of aesthetic reveals and expansion joints.

• Inspection and Certification:
  Includes requirements for on-site material inspection, rejection procedures for damaged or nonconforming products, and certification processes to verify compliance with applicable standards.

• Safety and Environmental Considerations:
  Reminds users to follow safety protocols and evaluate health and environmental impacts as per local regulations.

Applications

• New Construction and Retrofits:
  Suitable for both newly constructed buildings and retrofitting older structures, enhancing energy efficiency and façade durability.

• Commercial and Residential Projects:
  Widely used in commercial, institutional, and residential building exteriors for improved thermal performance and design flexibility.

• Moisture Control Solutions:
  EIFS with Drainage systems are particularly valuable in regions with high moisture exposure, helping prevent water intrusion and related issues such as mold or substrate deterioration.

• Aesthetic and Protective Finishes:
  Enables architects and builders to achieve a variety of finishes and colors, supporting building aesthetics while protecting the underlying structure.

• Prefabricated Panels:
  Supports offsite construction methods, enabling controlled fabrication environments and efficient onsite installation.

Related Standards

• ASTM E2568: Specification for PB EIFS; fundamental reference for system materials and performance criteria.
• ASTM E2430: Specification for Expanded Polystyrene Thermal Insulation Boards for Use in EIFS.
• ASTM C150: Specification for Portland Cement used in EIFS mortars.
• ASTM C1280: Specification for Application of Exterior Gypsum Panel Products for Use as Sheathing.
• ASTM C1063: Specification for Installation of Lathing and Furring to Receive Exterior Portland Cement-Based Plaster.
• ASTM E2570: Test Methods for Water-Resistive Barrier Coatings under EIFS.
• ASTM E2110: Terminology for EIFS - important for ensuring consistent communication across projects.
• ASTM E1825: Guide for Evaluation of Exterior Building Wall Materials, Products, and Systems.

Practical Value

This standard is essential for architects, contractors, building inspectors, and manufacturers engaged in the design and construction of exterior walls using EIFS. Compliance with ASTM C1397-13(2019) ensures quality installation, long-term system performance, and compatibility with energy conservation goals. It helps prevent common issues associated with poor EIFS application, including moisture problems, surface cracking, and finish failures. By following these best practices, stakeholders can deliver reliable, attractive, and energy-efficient building façades, while meeting international construction and safety standards.

Keywords: ASTM C1397, EIFS application, exterior insulation, polymer-based EIFS, EIFS with drainage, water-resistive barrier, field installation, prefabricated panels, building envelope, moisture control, ASTM standards.

Standards Content (Sample)

This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: C1397 − 13 (Reapproved 2019)
Standard Practice for
Application of Class PB Exterior Insulation and Finish
Systems (EIFS) and EIFS with Drainage
This standard is issued under the fixed designation C1397; 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
1.1 This practice covers the minimum requirements and 2.1 ASTM Standards:
procedures for field or prefabricated application of Class PB C11 Terminology Relating to Gypsum and Related Building
Exterior Insulation and Finish Systems (EIFS) and EIFS with Materials and Systems
Drainage. Class PB EIFS are systems applied over insulation C150 Specification for Portland Cement
board, in which the base coat ranges from not less than ⁄16 in. C1063 Specification for Installation of Lathing and Furring
(1.6 mm) to ⁄4 in. (6.4 mm) in dry thickness, depending upon to Receive Interior and Exterior Portland Cement-Based
the number of nonmetallic reinforcing mesh layers encapsu- Plaster
lated in the base coat (see Specification E2568). The base coat C1177/C1177M Specification for Glass Mat Gypsum Sub-
is then covered with a finish coat of varying thickness in a strate for Use as Sheathing
variety of textures and colors. EIFS with Drainage provides a C1186 Specification for Flat Fiber-Cement Sheets
mechanism to drain incidental moisture C1278/C1278M Specification for Fiber-Reinforced Gypsum
Panel
1.2 The values stated in inch-pound units are to be regarded
C1280 Specification for Application of Exterior Gypsum
as standard. The values given in parentheses are mathematical
Panel Products for Use as Sheathing
conversions to SI units that are provided for information only
C1325 Specification for Fiber-Mat Reinforced Cementitious
and are not considered standard.
Backer Units
1.3 The text of this practice references notes and footnotes
C1382 Test Method for DeterminingTensileAdhesion Prop-
which provide explanatory material. These notes and footnotes
erties of Sealants When Used in Exterior Insulation and
(excluding those in tables and figures) shall not be considered
Finish Systems (EIFS) Joints
as a requirement of the standard.
C1396/C1396M Specification for Gypsum Board
1.4 This standard does not purport to address all of the
C1472 Guide for Calculating Movement and Other Effects
safety concerns, if any, associated with its use. It is the When Establishing Sealant Joint Width
responsibility of the user of this standard to establish appro-
C1481 Guide for Use of Joint Sealants with Exterior Insu-
priate safety, health, and environmental practices and deter- lation and Finish Systems (EIFS)
mine the applicability of regulatory limitations prior to use.
E1825 Guide for Evaluation of Exterior Building Wall
1.5 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-
E2430 Specification for Expanded Polystyrene (“EPS”)
mendations issued by the World Trade Organization Technical Thermal Insulation Boards for Use in Exterior Insulation
Barriers to Trade (TBT) Committee.
and Finish Systems (“EIFS”)
E2568 Specification for PB Exterior Insulation and Finish
1 Systems
This practice is under the jurisdiction of ASTM Committee C11 on Gypsum
and Related Building Materials and Systems and is the direct responsibility of
Subcommittee C11.05 on Application of Exterior Insulating and Finish Systems and
Related Products. For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Current edition approved March 1, 2019. Published March 2019. Originally contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
approved in 1998. Last previous edition approved in 2013 as C1397 – 13. DOI: Standards volume information, refer to the standard’s Document Summary page on
10.1520/C1397-13R19. the ASTM website.
*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
C1397 − 13 (2019)
E2570 Test Methods for Evaluating Water-Resistive Barrier on a level platform and protected from the weather, surface
(WRB) Coatings Used under Exterior Insulation and contaminationorphysicaldamageinaccordancewiththeEIFS
Finish Systems (EIFS) or EIFS with Drainage manufacturer’s written instructions.
9.2 Materials shall be protected from exposure to direct
3. Terminology
sunlight and temperatures less than 40 °F (4 °C), unless
3.1 Definitions used in this standard shall be in accordance
otherwise specified by the manufacturer.
with Terminologies C11 and E2110.
9.3 Portland Cement shall meet Specification C150 and
shall be kept dry until ready for use. It shall be kept off the
4. Significance and Use
ground, under cover and away from damp walls and surfaces.
4.1 This practice provides minimum requirements for the
9.4 Insulation board shall be stacked flat with care taken to
application of Class PB EIFS and EIFS with Drainage (see
avoid damage to edges, ends, or surfaces; or exposure to direct
Specification E2568). The requirements for materials,
sunlight (ultraviolet radiation).
mixtures,anddetailsshallbecontainedintheprojectplansand
specifications. See Guide E1825 for guidance.
10. Environmental Conditions
5. Delivery of Materials
10.1 Cold Weather Conditions:
5.1 All materials shall be delivered in packages, containers, 10.1.1 Wet materials shall not be applied when the tempera-
or bundles with the identification and markings intact. ture is less than 40 °F (4 °C), unless otherwise specified by the
manufacturer, unless temporary heat and enclosures are pro-
6. Inspection
videdtomaintainminimum40°F(4°C)foraminimumperiod
of not less than 24 h before, during, and after application (see
6.1 Inspectionofthematerialsshallbeagreeduponbetween
Annex A1.9.3).
the purchaser and the supplier as part of the purchase agree-
10.1.2 Materials shall not be applied to a base containing
ment.
frost. Substrate surface temperature shall be not less than 40 °F
6.2 Inspection shall verify that the EIFS materials supplied
(4 °C). Mixtures for application shall not contain any frozen
are as required for the Class PB EIF System or EIFS with
ingredients.
Drainage System specified. Mixing of EIFS materials from
different manufacturers is not allowed.
11. Assessment of Condition of Substrates to Receive
Water-Resistive Barrier Coating (if applicable) or
7. Rejection
Exterior Insulation and Finish Systems or Both
7.1 Materials that are damaged, frozen or in any way
11.1 The substrate shall be as required by the project plans
defective shall not be used. Rejection of materials shall be
and specifications and as recommended by the EIFS manufac-
promptly reported verbally to the manufacturer and immedi-
turer for the particular system specified.
ately reported in writing. The notice of rejection shall contain
11.1.1 Insulation boards shall be as required by the EIFS
a statement documenting the basis for material rejection.
manufacturer’s specification and in the thickness specified.
8. Certification
11.2 The substrate shall be inspected by the applicator and
8.1 When specified in the contract documents, the producer general contractor to ensure that it meets the project plans and
shall furnish a report certifying that the materials are in specifications and the requirements of 11.3 – 11.8.
conformance with product and material standards and contract
11.3 Sheathing materials shall be inspected to ensure that:
documents.
11.3.1 The specified sheathing thickness has been installed
8.2 Insulation Boards: for the stud spacing used.
8.2.1 Insulation boards shall comply with Specification
11.3.2 Fastener type and fastener spacing are as specified.
E2430. 11.3.3 All Specification C1396/C1396M gypsum sheathing
8.2.2 The insulation boards shall have been subjected to a
boards shall have a water-resistant core.
third party quality control inspection and shall be marked as
11.3.4 Tongue and groove water-resistant treated core gyp-
approved for use within the EIFS.
sum sheathing boards conforming to Specification C1396/
8.2.3 Prior to installation, the insulation board shall be
C1396M shall be installed with the tongue edge oriented to the
inspected for conformance with contract documents. Noncon-
top.
forming insulation board shall not be used.
11.3.5 Gypsum sheathing shall be installed in accordance
8.2.4 The insulation board manufacturer shall furnish, for
with Specification C1280.
each shipment, a written certificate of conformance with the
11.3.6 Gypsum sheathing shall be protected from moisture
EIFS manufacturer’s specifications.
at all penetrations and terminations.
11.3.7 Glass mat gypsum sheathing complying with Speci-
9. Storage of Materials
fication C1177/C1177M shall be installed in accordance with
9.1 All materials shall be kept dry by storage under cover the sheathing manufacturer’s written installation instructions,
and protected from the weather. When outside storage is which include details of framing type and spacing, fastener
required, materials shall be stacked off the ground, supported type and spacing, and sheathing orientation and spacing.
C1397 − 13 (2019)
11.3.8 Plywood shall be not less than ⁄2 in. (12.7 mm) 11.6.2 Efflorescence and laitance on concrete, masonry,
nominal in thickness, exterior or exposure 1 wood-based panel stucco or clay tile substrates shall be removed prior to EIFS
sheathing. The plywood shall be installed with a ⁄8 in. (3.2 application. Concrete masonry shall be cleaned by light
mm) space between sheets. sandblasting, pressure washing, or brushing. Heavy deposits
shall be removed through use of hand or power impact tools
11.3.9 OrientedStrandBoard(OSB)shallbenominal ⁄16in.
followed by washing with an appropriate cleaner. Light depos-
(11.1 mm) thick APA Exposure 1 rated.
its shall be removed by washing with an appropriate cleaner.
11.3.10 Fiber-cement sheets complying with Specification
All loose particles and cleaner residue shall be removed by
C1186, TypeA, shall be installed in accordance with the sheet
washing with clean, potable water. The surface shall be
manufacturer’s written installation instructions, which include
allowed to dry.
details of stud type and spacing, fastener type and spacing, and
11.6.3 Existing paint on concrete or masonry surfaces shall
sheet spacing recommendations.
be removed by sandblasting or grit blasting. If removal of
11.3.11 Water-resistant exterior fiber-reinforced gypsum
existing paint is not practical, an alternate attachment surface
sheathing complying with Specification C1278/C1278M shall
or method shall be provided.
be installed in accordance with the sheathing manufacturer’s
written installation instructions, which include details of stud
11.7 Dryness:
type and spacing, fastener type and spacing, and sheathing
11.7.1 Newly constructed concrete or masonry surfaces
orientation and spacing.
shall be allowed to cure for a minimum of 28 days prior to
11.3.12 Fiber-mat reinforced cement sheets complying with
application of the EIFS or EIFS with Drainage. Repaired areas
Specification C1325, type A, shall be installed in accordance
on existing (aged) walls shall meet the same 28-day curing
with the sheet manufacturer’s written installation instructions,
time.
which include details of framing type and spacing, fastener
11.7.2 Sheathing must be dry prior to EIFS or EIFS with
type and spacing, and sheet orientation and spacing.
Drainage application.
11.3.13 Sheathing shall be continuous. 11.7.3 Substrate surfaces shall be free of visible water.
11.4 Alignment—All substrate surfaces shall be straight and 11.8 Metal Lath—Ifmetallathisused,itshallbeinstalledin
true within ⁄4 in. (6.4 mm) in 10 ft (3048 mm). More stringent
conformance with Specification C1063, except lath edges shall
2 2
requirements by the EIFS manufacturer shall supersede the be butted, not lapped. Metal lath shall be 3.4 lb/yd (1.3 kg/m )
2 2
above stated requirements.
or 2.5 lb/yd (1.0 kg/m ), self furring or flat, G60 galvanized.
11.8.1 Metal members shall be properly attached, straight,
11.5 Suitability for Use—Thesubstratesurfaceshallbefirm,
and true unless required by the system design.
sound, and undamaged in order to receive the Water- Resistive
11.8.2 Metal members shall be free of rust, oil, or other
Barrier Coating or EIFS.
foreign matter or contaminants, which cause bond failure or
11.5.1 Loose, spalling or crumbling concrete or masonry
unsightly discoloration.
shall be removed by sandblasting or other appropriate means.
If the surface condition of the substrate is at all in doubt, an
12. Water-Resistive Barrier (WRB) Coating (When
alternative attachment surface or method shall be provided.
Specified) (See Test Methods E2570)
11.5.2 Broken, cracked or delaminated substrate boards
12.1 Manufacturer’s Recommended Joint Treatment (not
shall be replaced or restored to a condition equal to adjacent
required with concrete or masonry substrates)
undamaged boards.
11.5.3 All rotted, decayed, or delaminated wood and ply-
NOTE 2—Joint treatment materials and methods differ among manufac-
wood sheathing shall be replaced.
turers. Some manufacturers use self-adhesive membrane tapes and others
use fluid-applied flexible coatings with embedded reinforcing mesh or
11.5.4 Paper-faced gypsum sheathing that has been installed
fabric.
and exposed to the elements for more than 30 days shall be
12.1.1 For sheathing substrates, apply manufacturer’s rec-
checked at not less than two locations, or every 5000 ft (465
m ), whichever is greater, for integrity of the surface. The ommended treatment along all joints in sheathing, inside and
procedures for evaluating the gypsum sheathing are found in outside corners, and exposed edges of sheathing at termina-
Annex A2. tions in accordance with manufacturers recommended details .
12.1.2 Center the treatment on sheathing joints, edges, etc.
NOTE 1—Gypsum sheathing conforming to Specification C1396/
For self-adhesive membrane tapes and self-adhesive mesh,
C1396M is sometimes not recommended for adhesive attachment by the
apply with the pressure-sensitive adhesive backing in contact
gypsum sheathing manufacturer. Consult with the gypsum board manu-
facturer before use. with the sheathing surface.
12.1.3 When applicable, use a stainless steel trowel or
11.6 Cleanliness—The surface of all substrates shall be
spatula to apply water-resistive barrier coating over tape and
clean and free from any foreign materials such as paint, form
spot all fastener heads. (Spotting of fasteners is not required
release agents, curing compounds, dust, dirt, frost, oil or
when applying water-resistive barrier with a trowel.)
grease, efflorescence and laitance that would affect the EIFS or
12.1.4 After the first pass has dried, check joints and spot
EIFS with Drainage application.
any voids that may be present with additional coating to
11.6.1 All sheathing board substrates shall have all loose
achieve a continuous film.
dirt and dust removed by cleaning methods appropriate for the
job and job conditions. 12.2 Water-Resistive Barrier Coating
C1397 − 13 (2019)
12.2.1 Roller Application 15. Adhesive and Mechanical Attachment Method
12.2.1.1 Use a roller recommended by manufacturer.
15.1 Adhesive shall be applied using the ribbon and dab
12.2.1.2 Apply a uniform, continuous film of the water-
method, the notched trowel method, or in accordance with
resistive barrier coating over the entire surface of the
system manufacturer’s current published instructions.
sheathing, concrete, or masonry, including previously treated
15.2 Mechanicalfastenersshallbeinstalledintotheframing
areas.
or nailable substrate.
NOTE 3—For concrete and masonry ensure that a continuous film of 5
15.3 Fasteners shall penetrate not less than ⁄16 in. (8.0 mm)
uniform thickness is applied across the entire surface including mortar
intosteelframingmembers,1in.(25.4mm)intowoodframing
joints. Substrates with a surface texture or high porosity will require
members, and 1 in. (25.4 mm) into masonry substrates.
additional material.
15.4 Mechanical fasteners shall be corrosion resistant. Fas-
12.2.2 Trowel Application
tener type and spacing shall be in accordance with system
12.2.2.1 Using a stainless steel trowel, apply a continuous
manufacturer’s current published instructions.
film of the water-resistive barrier coating onto the entire wall
15.5 Selection and frequency of fasteners and fastener type
surface. The material shall be applied at a smooth, uniform,
will vary depending on substrate type, insulation board thick-
continuous film at the coverage rate specified by the manufac-
ness and design wind load and whether used in combination
turer.
with an adhesive attachment. Therefore fastener type, patterns,
12.2.3 Spray Application
and use shall be in accordance with the EIFS manufacturer’s
12.2.3.1 Using a handheld hopper gun or other suitable
written instructions and shall be included in the project plans
spray equipment, spray a layer of water-resistive barrier
and specifications.
coating onto the wall surface.
12.2.3.2 In order to create a smooth continuous film, use a
16. Mechanical Attachment Method
roller as described in 12.2.1 when specified by the manufac-
16.1 Mechanicalfastenersshallbeinstalledintotheframing
turer.
or nailable substrate.
13. Drainage Means (If Applicable) 16.2 Mechanical fasteners shall be corrosion resistant. Fas-
tener type and spacing shall be in accordance with the EIFS
13.1 EIFS with Drainage require a means of drainage. This
manufacturer’s current published instructions.
can be accomplished by one of the following methods; vertical
NOTE 4—Wind-load requirements shall be considered for mechanically
notch trowel adhesive application, grooved insulation board,
fastened systems.
drainage mat, sheet type water-resistive barriers designed for
drainage, metallic lath or non-metallic lath.
17. General Requirements
13.2 The EIFS shall be installed such that EIFS
17.1 Insulation boards shall be placed from a level base line
components,includingsealantsandflashings,donothinderthe
with vertical joints staggered in a running bond pattern and
drainage capability of the EIFS.
butted tightly.
17.2 Insulation board joints at all inside and outside corners
14. Insulation Board Installation
shall be staggered and interlocked.
14.1 Method of attachment shall be approved by the system
17.3 Insulation boards must abut without gaps, eliminating
manufacturer.
space for adhesive or base coat intrusion between the board
14.2 Adhesive Attachment Method—The adhesive shall be
edges and ends.
applied to the back of the insulation board by one of the
17.4 Fenestration openings and other wall openings shall be
following methods:
cut out of a single insulation board. Board joints shall not be
14.2.1 Notched Trowel (Required when Installing EIFS over
aligned at corners with head, sill or jambs of windows, doors,
Sheathing Substrates):
similar openings, and aesthetic reveals.
14.2.1.1 For EIFS with Drainage the notches shall be
17.5 Adhesively Attached:
oriented vertically when using adhesive as the means to create
17.5.1 The final insulation board thickness shall be not less
the drainage plane. Refer to EIFS manufacturer for proper size
than ⁄4 in. (19.1 mm).
of notch trowel and applications over lath.
17.5.2 Insulation board joints shall be offset not less than 6
14.2.2 Ribbon and Dab (Acceptable over Concrete and
in. (152.4 mm) from horizontal sheathing board joints.
Masonry):
17.6 Mechanically Fastened:
14.2.2.1 The adhesive shall be applied to the entire perim-
17.6.1 The insulation board thickness shall be not less than
eter of the insulation board in a ribbon fashion that is not less
1 in. (25.4 mm).
than 2 in. (50.8 mm) wide by not less than ⁄8 in. (9.5 mm)
17.6.2 Insulation board joints shall be offset from horizontal
thick. Dabs not less than 4 in. (101.6 mm) in diameter by not
sheathing board joints.
less than ⁄8 in. (9.5 mm) thick shall be applied not more than
8 in. (203.2 mm) on center over the remainder of the board. 17.7 When attachment is by adhesive or adhesive and
Refer to EIFS manufacturer for applications over lath. mechanical fasteners, each insulation board shall be installed
C1397 − 13 (2019)
by sliding it into place until it abuts the adjoining insulation before base coat. The single layer of reinforcing mesh shall be
board tightly. Pressure shall be applied over the entire surface continuous at all corners.
of the insulation board to achieve uniform contact and an
19.4.1 The surface shall be free of voids, projections, trowel
overall level surface. The insulation board shall be occasion-
marks and other surface irregularities. The base coat thickness
ally checked for proper contact with the substrate by removing
shall be sufficient to totally embed the reinforcing mesh.
a piece of insulation board. Proper contact has been achieved
19.5 Reinforcing Mesh Overlap—All reinforcing mesh
when approximately equal portions of the adhesive remain on
edges shall be overlapped not less than 2 ⁄2 in. (63.5 mm).
both the substrate and the insulation board when the board is
removed from the wall. The insulation board shall remain
19.6 Impact Layers—When required, higher impact perfor-
undisturbed for no less than 24 h prior to proceeding with the
mance shall be achieved with multiple layers of reinforcing
installation of mechanical fasteners or the base coat. Cool,
mesh or by incorporating heavier weight reinforcing mesh.All
damp weather conditions extend minimum curing or drying
areas requ
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