Patent ID: 8057148

Claim:
A roofing material fastener comprising: (a) a shank element having a length dimension and a point, said shank element being adapted to enable it to be driven through at least a first course of roofing material and into a roof deck; (b) a fastener head positioned in a region of the shank element distal from said point; and (c) a spike protrusion projecting from said region of the shank element to a terminus; said spike protrusion having a length less than one half the length of the shank, measured from the point to the fastener head; wherein the spike protrusion is adapted to penetrate a depth less than the full depth of a second course of roofing material installed above said first course; wherein the spike protrusion is shaped to inhibit sawing through said second course of roofing material by said spike protrusion; and wherein the length of the spike protrusion is from about 0.030 in. to about 0.070 in.