The Drill-Tec Super Extra Heavy Duty #21 Roofing Fastener is a specialized, high performance fastener designed to secure single-ply membrane to 22 gauge metal decks or lighter.
The fastener will be a Drill-Tec Super Extra Heavy Duty #21 Roofing Fastener
with a thread diameter of .325. The fastener must have 14 threads per inch and a
drill point. Also, the fastener must be heat treated per specification OMG-1. The
fastener must be made in U.S.A. coating requirements
The fastener will be coated with the Drill-Tec CR-10 corrosion resistant coating. When subjected to 30 Kesternich cycles (DIN 50018), the fastener must show less than 15% red rust and surpass Factory Mutual Approval Standard 4470.
The Drill-Tec Super Extra Heavy Duty #21 Roofing Fastener should always be tested
on-site by a GAF representative to determine performance and proper installation
procedure. Call GAF to schedule testing.
Note: Make sure not to overdrive the fastener. Fastener must be tight enough so that the plate doesn’t turn. Factory Mutual requires that the fastener penetrates the steel deck at the top flute.
Head Diameter: .500
Head Style: #3 Phillips Truss
Thread Diameter: .325
All documents are U.S. English unless otherwise noted