2025 Convention Session: Determining Life Expectancy of In-Situ Slate Roofing (Meijer, Knight)

Course Overview
This session was originally presented at the 2025 IIBEC International Convention & Trade Show in Orlando, Florida.  This course includes the following components:

• recording of the live session
• a summative assessment consisting of 10 multiple-choice questions
• two surveys required to claim continuing education credit

Description

Typical industry standard recommendation for slate replacement is at a 20% or more failure threshold. There are no field or lab tests that currently predict the remaining lifespan of existing weathered slate. However, ASTM C406 Standard Specification for Roofing Slate establishes the “grade” of new roofing slate, associated with projected life expectancy. Peter Meijer Architect PC sent slate samples to several labs to conduct C120 Standard Test Methods of Flexure Testing of Slate, C121 Standard Test Method for Water Absorption of Slate, and C217 Standard Test Method for Weather Resistance of Slate. These test results gave a gauge to the existing slate’s performance. A critical aspect of determining the life expectancy of archaic/older material is understanding the limitations associated with modern ASTM test methods. ASTM standards are not always accurate predictors of slate quality but are good sources of empirical data. Peter Meijer Architect PC used our experience and broadened our research into longevity by including testing means and methods from Europe and other countries with a longer history of slate testing. The standards in use on the market to certify slate are the British Standard Institute, BS EN 12326-1:2014, Slate and Stone for Discontinuous Roofing and External Cladding, and the United States ASTM C406.

Author/Speaker
Peter Meijer, AIA, RP
Principal
Peter Meijer Architect PC

Peter Meijer, principal, has over 30 years of professional experience with an emphasis on the preservation and assessment of older, existing, and historic buildings. As a professional architect with a background in scientific research, He has developed his career with a focus on the unique building sciences associated with existing and historic resources. He has become a well-regarded expert on the diverse issues affecting older buildings both regionally and nationally.

Non-Presenting Author

Hali Knight
Peter Meijer Architect

Hali Knight has 10 years of professional experience, primarily with a focus on restoration and building enclosure design for existing and historic structures. While at Peter Meijer Architect PC (PMA), she has led many projects that include assessments and repair recommendations for historic materials such as masonry, slate, and terra cotta. Many of PMA’s projects use material testing and on-site evaluation as tools to direct building enclosure repair methodologies and priorities. In addition to restoration work, she has worked on several large-scale renovation projects that include seismic upgrades and tenant improvements.

Course Access
Courses are accessible in LearnUpon for one year from the date of purchase.

Credit Start Date   01/15/25            Credit Expiration Date  01/15/28

Course Recommended Prerequisite(s)

Attendees should have a general knowledge of slate roof systems.

IIBEC Core Competencies: Roofing

Knowledge Level: Intermediate

Continuing Education Credit Statement
This course is approved for 1.0 IIBEC CEH

This course is approved for 1.0 AIA LU/HSW
AIA Course Number: CONV25_06_OD
AIA Provider Number: G024

Continuing Education Credit Claim Information

To claim IIBEC CEHs, learners are required to:

• Achieve a passing score of 70% on the summative assessment (learners are provided unlimited attempts)
• Complete the course Evaluation & Attestation Survey

After completing the Evaluation & Attestation Survey, learners will be able to download a Certificate of Completion.  Learners are responsible for self-reporting IIBEC CEH credit by uploading their Certificate of Completion to their IIBEC Portal. For assistance in self-reporting CEHs, please reach out to: cehs@iibec.org

To claim AIA LU, learners are required to complete the above requirements, as well as:

• Complete the AIA Survey (AIA member number is required)

AIA continuing education Learning Units earned upon completion of this course will be reported to AIA CES for AIA members.

AIA CES Provider statement

IIBEC is a registered provider of AIA-approved continuing education under Provider G024. All registered AIA CES Providers must comply with the AIA Standards for Continuing Education Programs.  Any questions or concerns about this provider or this learning program may be sent to AIA CES (cessupport@aia.org or (800) AIA 3837, Option 3).

This learning program is registered with AIA CES for continuing professional education. As such, it does not include content that may be deemed or construed to be an approval or endorsement by the AIA of any material of construction or any method or manner of handling, using, distributing, or dealing in any material or product. AIA continuing education credit has been reviewed and approved by AIA CES. Learners must complete the entire learning program to receive continuing education credit. AIA continuing education Learning Units earned upon completion of this course will be reported to AIA CES for AIA members. Certificates of Completion for both AIA members and non-AIA members are available upon request.