NSA
NATIONAL SLATE ASSOCIATION
dedicated to promoting excellence in slate roofing practices

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Amber Consulting Co.
Tom Olson; 802-775-1650

St. Lawrence Testing & Inspection Co., Ltd., Attn: Gib McIntee, Box 997, 814 Second St. W., Cornwall, Ontario, Canada K6H5V1; 613-938-2521 t.; 613-938-7395 f; Email

Wiss Janney Elstner Associates
330 Pfingsten Road, Northbrook, Illinois 60062; 847-272-7400; Contact:  Bernie Wonneberger

PRI Construction Materials Technologies, LLC., 6408 Badger Drive, Tampa, FL 33610; ph: 813-621-5777; Contact: Don Portfolio. PRI is a testing lab which is Dade County (FL) approved as well as ICC approved to test building materials. We have tested slate in the past and our analysis and certificate of analysis has led to a Dade County approval of the product. [NSA Note: Dade County approval deals with ASTM C 406 as well as static uplift.]
National Slate Association    P.O. Box 172, Poultney, Vermont 05764;    Phone Toll Free: (866) 256-2111;    Fax: (802) 287-5720