Slate Testing Labs

Recommended Slate Testing Laboratories

Testing slate roofing materials to ensure that standards are met is important to everyone. However, the National Slate Association has found that there can be significant variation in test results from some slate testing labs. Therefore we offer the below list of NSA-recommended slate testing laboratories.

Slate Testing Laboratory Status Application
We welcome other slate testing laboratories to apply for listing on slate testing laboratory page. For an application, please email the NSA. Upon satisfactory review by our Standards Committee, the slate materials testing laboratory will be listed below on this page.

Learn more about the standards for testing roofing slate.

Amber Consulting Co.
P.O. Box 567
Pittsford, VT 05763
Fax 802-775-1959
Contact: Tom Olson

St. Lawrence Testing & Inspection Co., Ltd.
Box 997, 814 Second St. W.
Cornwall, Ontario, Canada K6H 5V1
Fax 613-938-7395
Contact: Gib McIntee

Wiss, Janney, Elstner Associates, Inc.
330 Pfingsten Road
Northbrook, Illinois 60062
Fax 847-480-9534
Contact: Michael J. Scheffler, PE, Principal

PRI Construction Materials Technologies, LLC.
6408 Badger Drive
Tampa, FL 33610
Contact: Zak Priest


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