ISO 17738-3:2019 断熱製品—外部断熱および仕上げシステム（EIFS）—パート3：設計要件 | ページ 2

Foreword

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This document was prepared by Technical Committee ISO/TC 163, Thermal performance and energy use in the built environment, Subcommittee SC 3, Thermal insulation products.

A list of all parts in the ISO 17738 series can be found on the ISO website.

Introduction

This document provides specifications for architects, design professionals and builders on the integration of an exterior insulation and finish system (EIFS) into their projects.

This document is predicated on the selected EIFS assembly being in compliance with the requirements of ISO 17738-1, and system installation in compliance with ISO 17738-2.

The design criteria in this document are based on the principle that the building envelope contains five ‘planes-of-control’:

• water-shedding barrier;
• water-resistive barrier;
• thermal barrier;
• air barrier;
• vapour barrier.

Each plane-of-control corresponds to an individual function that the cladding assembly is designed to perform. The function of the planes-of-control are:

• Water-shedding barrier: This is designed to deflect rainwater away from the wall surface, thereby minimizing water penetration into the cladding assembly.
• Water resistive barrier: Accepting that some water could find its way behind the cladding, a continuous water resistive barrier is required to protect the substrate. Water that penetrates one cladding component should not be directed to drain behind another. Any water that reaches the water resistive barrier should have a clear drainage path to the exterior of the cladding.
• Continuous thermal barrier: The principle benefit of an EIFS cladding is the continuous thermal barrier installed on the exterior of the structure. Insulation should be adequate to prevent condensation within the wall assembly while meeting requirements for energy use. The designer should detail the thermal barrier to minimize thermal bridging, using ISO 14683 as a guide.
• Air barrier system: Effective thermal and moisture control requires a continuous air barrier system on all faces of the building envelope. With an EIFS, the air barrier function is provided by the water resistive barrier. Details should show connections with other airtight elements and materials within the building envelope.
• Vapour barrier: Where required by environmental conditions, a vapour barrier, may be a component of the EIFS. The vapour barrier might, for example be a vapour-impermeable water resistive barrier or another material in the wall assembly (e.g. polyethylene sheet). The function of the vapour barrier is to minimize water vapour penetrating through materials comprising the wall assembly then condensing on a cold surface where it has limited ability to drain or dry.

This document addresses the minimum number of locations in the wall assembly where the creation of architectural details is essential. When creating EIFS details for a project, the designer should be mindful of how the five planes-of-control within the building envelope are integrated across the various architectural components (e.g. the air barrier of a window functions as a hermetic part of the air barrier system when structurally sealed to the air barrier of the wall).

An important aspect of developing details is to specify materials that meet the function of each plane-of-control. The detail then illustrates how the control planes are connected. A series of illustrations showing sequence of installation and connection could be necessary. Each detail should clearly illustrate how a plane-of-control is integrated with the adjacent element to provide a continuous layer within the building envelope.

1 Scope

This document specifies the design requirements, selection and application of exterior insulation and finish systems (EIFS) for use by building designers, building code officials, product manufacturers and contractors in order to sustain the installed performance and durability of EIFS.

This document contains design requirements for the design and installation of an EIFS as a wall cladding system. The document includes selection of materials that meet the requirements of ISO 17738-1, and installation requirements in accordance with ISO 17738-2 and covers the interfaces between EIFS and other building assemblies and components.

This document refers to adhesively fastened systems, although mechanical fastening could be required in specific circumstances (refer to Annex A). For information on EIFS resiliency, refer to Annex B.

This document does not specify the structural design of the substrate to which the EIFS is attached, nor does it provide design requirements when the installation of EIFS uses mechanical fasteners.

This document is applicable to new and retrofit EIFS installations.

2 Normative reference

The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.

3 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO 7345, ISO 9229, ISO 17738-1, ISO 17738-2 and the following apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

Bibliography