CMHC's New Best Practice Guide for EIFS

Part 2 of 2 of an article on the architectural detailing of EIFS. The first part addressed the new CMHC EIFS Best Practice Guide, and this second part will address application of the guide on actual details…

By: Kevin Day

The architectural details for EIFS are sometimes considered a challenge, particularly when it comes to understanding the interface of EIFS with other elements of the building envelope. One key element is ensuring that the water-resistive barrier coating over the substrate is continuous (Figure 1). This can even be detailed as the air and vapor barrier for the wall assembly.

Figure 1 – Horizontal Expansion Joint for non-load bearing Steel Stud Walls

One aspect of the expansion joint detail to consider is the fact that sloping the EPS through the entire depth of the expansion joint will increase the labour to install such joint systems (as illustrated in part 1 of this article), so as a compromise, the joint detail in Figure 1 could be utilized as this will not add much to the labour, but will ensure the out edge of the joint is sloped to promote drainage. Also, it is generally preferred that the sealant be recessed somewhat for aesthetics.

Also critical is making certain that the drainage of incidental moisture can be managed through the interface joints, as shown in Figure 2.

Figure 2 – Horizontal Joint – Vented – at Precast Coping Figure

Penetrations invariably occur in these systems, and the design detailing must consider the construction sequence. Thus, it is useful to issue details that illustrate the steps needed to ensure the system installation is done properly during construction, as the cutaway in Figure 3 illustrates.

Figure 3 – Window Head – Decorative Detailing

EIFS have demonstrated durability and fire resistance, and can be widely adapted for many construction applications. As with other cladding systems, limitations and weaknesses exist with EIFS.

An understanding of the technology and established specification and application guidelines can provide a solid basis for successful adaptation of EIFS in contemporary construction practice.

EIFS are practical and highly effective in this day of increased energy costs. Combined with aesthetic benefits, the systems can easily be incorporated into most building designs, and provide a designer with a medium to create interesting and dynamic architectural features that are unique to each building.

About the Author

Kevin C. Day is a specialist in wall cladding and building enclosure technology, with a particular expertise in exterior insulation finish systems (EIFS), stucco cladding, windows and sealant systems. He has been involved in many building failure and mold investigations, remediation projects, and also in providing technical opinions for litigation and insurance claims. Kevin is currently employed by DuRock Alfacing International Limited as the Technical Director & NationalSales Manager; principle duties include overseeing all aspects of sales and technical affairs.Kevin has been very active with numerous associations, including OBEC, NBEC, CSC, RCI,and AWCI, as well as several standard writing committees including ASTM, ANSI, CSA, & ULC.


	CMHC's New Best Practice Guide for EIFS Part 2 of 2 of an article on the architectural detailing of EIFS. The first part addressed the new CMHC EIFS Best Practice Guide, and this second part will address application of the guide on actual details… By: Kevin Day The architectural details for EIFS are sometimes considered a challenge, particularly when it comes to understanding the interface of EIFS with other elements of the building envelope. One key element is ensuring that the water-resistive barrier coating over the substrate is continuous (Figure 1). This can even be detailed as the air and vapor barrier for the wall assembly. Figure 1 – Horizontal Expansion Joint for non-load bearing Steel Stud Walls One aspect of the expansion joint detail to consider is the fact that sloping the EPS through the entire depth of the expansion joint will increase the labour to install such joint systems (as illustrated in part 1 of this article), so as a compromise, the joint detail in Figure 1 could be utilized as this will not add much to the labour, but will ensure the out edge of the joint is sloped to promote drainage. Also, it is generally preferred that the sealant be recessed somewhat for aesthetics. Also critical is making certain that the drainage of incidental moisture can be managed through the interface joints, as shown in Figure 2. Figure 2 – Horizontal Joint – Vented – at Precast Coping Figure Penetrations invariably occur in these systems, and the design detailing must consider the construction sequence. Thus, it is useful to issue details that illustrate the steps needed to ensure the system installation is done properly during construction, as the cutaway in Figure 3 illustrates. Figure 3 – Window Head – Decorative Detailing EIFS have demonstrated durability and fire resistance, and can be widely adapted for many construction applications. As with other cladding systems, limitations and weaknesses exist with EIFS. An understanding of the technology and established specification and application guidelines can provide a solid basis for successful adaptation of EIFS in contemporary construction practice. EIFS are practical and highly effective in this day of increased energy costs. Combined with aesthetic benefits, the systems can easily be incorporated into most building designs, and provide a designer with a medium to create interesting and dynamic architectural features that are unique to each building. About the Author Kevin C. Day is a specialist in wall cladding and building enclosure technology, with a particular expertise in exterior insulation finish systems (EIFS), stucco cladding, windows and sealant systems. He has been involved in many building failure and mold investigations, remediation projects, and also in providing technical opinions for litigation and insurance claims. Kevin is currently employed by DuRock Alfacing International Limited as the Technical Director & NationalSales Manager; principle duties include overseeing all aspects of sales and technical affairs.Kevin has been very active with numerous associations, including OBEC, NBEC, CSC, RCI,and AWCI, as well as several standard writing committees including ASTM, ANSI, CSA, & ULC.

	Building Envelope Forum is published by York Communications/MMPI, the owners of the Construction Law Update News Bulletin, Canadian Apartment Investment Report, and Real Estate Forum. York Communications also produces Canada’s largest expositions and conferences for design, construction, and real estate management professionals including Construct Canada, HomeBuilder & Renovator Expo, Concrete Canada, PM Expo, DesignTrends, RoofTech and the Real Estate Forums. For more details, see our website at www.yorkcommunications.ca.