Web exclusives

The "Web exclusive" section offers additional editorial and images related to articles available in Professional Roofing's print version and on its website. This section provides a valuable supplement to information in this issue. Web-exclusive information is updated monthly and is available only online.

Full version of Rusty Griffith's letter

Additional information about NRCA's Pentagon Project and Gold Circle Awards

Specifications for calculating theoretical allowable moments

Additional information about the manual and Olson's May 2002 article.