Shingle with improved fastener pull-through resistance

Abstract

A laminated shingle resistant to fastener-head pull-through. The shingle includes an upper layer having a tab portion and a headlap portion, and a shim extending below the tab portion and part of the headlap portion. The part of the shim behind the tab portion forms, with the headlap portion, a dual thickness nailing zone. Since roofers sometimes drive fasteners such as roofing nails through the shingle behind the nailing zone, resulting in only a single layer available to resist fastener-head pull-through, a reinforcing tape which can have reinforcing strands is adhered to the bottom of the headlap portion immediately behind the rear edge of the shim. This effectively increases the size of the nailing zone without incurring the bulk, weight and cost of increasing the size of the shim.

1 . A laminated shingle resistant to fastener-head pull-through, comprising:
 a) an upper layer having a tab portion having a front edge, and a headlap portion having a rear edge,   b) the headlap portion being adapted to be covered by another shingle and the tab portion being adapted to be exposed to the elements,   c) the tab portion comprising a plurality of tabs separated by spaces, the spaces having rear ends,   d) a lower layer located below said upper layer and extending from approximately said front edge of said upper layer to a position rearwardly of the rear edges of said spaces but forwardly of the rear edge of said upper layer, said lower layer defining with said upper layer a fastening zone of dual thickness for receiving fasteners having heads to hold said shingle on a roof, said fastening zone coinciding with part of said headlap portion,   e) and a reinforcing tape extending longitudinally of said shingle over at least a portion of said headlap portion rearwardly of said fastening zone, said tape being resistant to the head of a fastener being pulled therethrough, so that if a fastener is driven into said headlap portion rearwardly of said fastening zone, then if a wind pulls said shingle upwardly, said tape will resist the tendency of said shingle to pull past the head of said fastener.   
     
     
         2 . A shingle according to  claim 1  wherein said upper layer has a lower surface, and said tape is self-adhesive and is adhered to the lower surface of said upper layer. 
     
     
         3 . A shingle according to  claim 2  wherein said tape has a front edge which is located immediately rearwardly of the rear edge of said lower layer. 
     
     
         4 . A shingle according to  claim 1  wherein said upper layer has an upper surface, and wherein said tape is positioned on or near said upper surface. 
     
     
         5 . A shingle according to  claim 4  wherein said tape extends forwardly to said rear ends of said spaces. 
     
     
         6 . A shingle resistant to fastener head pull-through, comprising:
 (a) a layer having a tab portion having a front edge, and a headlap portion having a rear edge,   (b) the headlap portion being adapted to be covered by another shingle and the tab portion being adapted to be exposed to the elements,   c) the tab portion comprising a plurality of tabs separated by spaces, the spaces having rear ends,   (d) said layer having a fastening zone extending from approximately the rear ends of said spaces rearwardly, said fastening zone having a rear edge spaced forwardly of the rear edge of said headlap portion, said fastening zone being adapted to receive fasteners having heads to hold said shingle on a roof,   (e) and a reinforcing tape extending longitudinally of said shingle over at least a portion of said headlap portion in said fastening zone, said reinforcing tape extending rearwardly of the rear edge of said fastening zone and not extending forwardly of the rear ends of said spaces, said tape being resistant to the head of a fastener passing therethrough.   
     
     
         7 . A shingle according to  claim 6  wherein said reinforcing tape is located on a lower surface of said shingle. 
     
     
         8 . A shingle according to  claim 6  wherein said reinforcing tape is inset into an upper surface of said shingle. 
     
     
         9 . A shingle resistant to fastener-head pull-through, comprising:
 (a) a layer having a front portion and a headlap portion behind said front portion, said front portion having a front edge, said headlap portion having a rear edge, and there being a dividing line between said front portion and said headlap portion,   (b) the headlap portion being adapted to be covered by another shingle, and the front portion being adapted to be exposed to the elements,   (c) said layer having a fastening zone extending from said dividing line rearwardly, said fastening zone having a rear edge spaced forwardly of the rear edge of said headlap portion, said fastening zone being adapted to receive fasteners having heads to hold said shingle on a roof,   (d) and a reinforcing tape extending longitudinally of said shingle over at least a portion of said headlap portion in said fastening zone, said reinforcing tape extending rearwardly of the rear edge of said fastening zone and not extending forwardly of said dividing line, said tape being resistant to the head of a fastener passing there through.   
     
     
         10 . A shingle according to  claim 9  wherein said reinforcing tape is located on a lower surface of said shingle. 
     
     
         11 . A shingle according to  claim 9  wherein said reinforcing tape is set into an upper surface of said shingle.