The reference to CAN/ULC-S716.1, “Standard for Exterior Insulation and Finish Systems (EIFS) – Materials and Systems”, in Clause 5.9.4.1.(1)(b) does not preclude the use of other component materials that may also meet the intent of the Code.
For example, using mineral-fibre insulation in lieu of other rigid insulation types, mechanical fastening methods for the insulation component in lieu of adhesive, or a type of water-resistive barrier other than a liquid-applied water-resistive barrier could be acceptable.
The following two companion standards facilitate the application of and conformance with CAN/ULC-S716.1:
- CAN/ULC-S716.2, “Standard for Exterior Insulation and Finish Systems (EIFS) – Installation of EIFS Components and Water Resistive Barrier”, and
- CAN/ULC-S716.3, “Standard for Exterior Insulation and Finish System (EIFS) – Design Application”.
Additional information on EIFS design and installation can be found in the EIFS Council of Canada’s “EIFS Practice Manual” and the manufacturer’s literature. CAN/ULC-S716.1 provides minimum performance criteria for EIFS materials and systems that are tested under specific laboratory test protocols identified in the standard. However, compliance with this standard does not ensure that a system is appropriate for all projects. When selecting an EIFS product, designers should consider all relevant criteria—not only those covered by the tests in CAN/ULC-S716.1—including, but not limited to,
- building exposure
- local climate characteristics (wind, precipitation, temperature variations, solar exposure)
- intended building use
- intended resistance to damage and deterioration
- construction tolerances
- constructability The drainage capacity and thermal performance of the EIFS assembly can be affected by the dimensions and configuration of the EIFS drainage cavity.
EIFS are installed over other building materials such as sheathing and primary structural components, which have various construction installation tolerances. Designers should take into consideration the cumulative effects of construction tolerances and sequencing when specifying the drainage method and the cavity dimensions and configuration in order to ensure adequate drainage.
Designers should also take into account the impact of air movement, which varies depending on cavity size and the extent of venting, on the EIFS’ thermal performance when reviewing the overall thermal performance of the building envelope.
ASTM C 1363, “Standard Test Method for Thermal Performance of Building Materials and Envelope Assemblies by Means of a Hot Box Apparatus”, presents one method for assessing the thermal performance of assemblies.