Recommended Slate Testing Laboratories

Recommended Testing Laboratories

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

Other testing laboratories are invited to apply for listing on our website. For an application, please email the NSA. Upon satisfactory review by our Standards Committee, the testing laboratory will be listed on this page.

Learn more about Standards for Testing Roofing Slate.

Amber Consulting Co.

P.O. Box 567
Pittsford, VT 05763

802-775-1650
Fax 802-775-1959

Contact: Tom Olson

St. Lawrence Testing & Inspection Co., Ltd.

Box 997, 814 Second St. W.
Cornwall, Ontario, Canada K6H 5V1

613-938-2521
Fax 613-938-7395

Contact: Gib McIntee

Wiss, Janney, Elstner Associates, Inc.

330 Pfingsten Road
Northbrook, Illinois 60062

847-753-6417
Fax 847-480-9534