Roofing underlayment

Abstract

A roofing underlayment for placement over a roof substrate prior to the application of shingles, tiles or other roofing materials. The underlayment comprises a sheeting material having an upper surface and a lower surface. The underlayment contains a grid that is visually identifiable from above the underlayment when the underlayment is received over the roof substrate with its lower surface adjacent to the roof substrate. The grid assists in the alignment of the underlayment with the roofing substrate during application of the underlayment to the substrate and further assists in the alignment of roofing materials applied over the underlayment.

1 . A roofing underlayment for placement over a roof substrate prior to the application of shingles, tiles or other roofing materials, the underlayment comprising a sheeting material having an upper surface and a lower surface, said underlayment containing a grid that is visually identifiable from above said underlayment when said underlayment is received over said roof substrate with said lower surface of said underlayment adjacent to said roof substrate, said grid assisting in the alignment of said underlayment with said roofing substrate during application of said underlayment to said substrate and further assisting in the alignment of roofing materials applied over said underlayment.  
   
   
       2 . The underlayment as claimed in  claim 1  wherein said underlayment is a thin rolled material.  
   
   
       3 . The underlayment as claimed in  claim 1  wherein said grid is printed on said upper surface of said underlayment.  
   
   
       4 . The underlayment as claimed in  claim 1  wherein said grid is embossed on said upper surface of said underlayment.  
   
   
       5 . The underlayment as claimed in  claim 1  wherein said grid is comprised of a series of equally spaced apart lines that are parallel to the longitudinal axis of said underlayment.  
   
   
       6 . The underlayment as claimed in  claim 1  wherein said grid is comprised of a series of equally spaced apart lines that are perpendicular to the longitudinal axis of said underlayment.  
   
   
       7 . The underlayment as claimed in  claim 1  wherein grid is comprised of a series of equally spaced apart lines that are parallel to the longitudinal axis of said underlayment and a series of equally spaced apart lines that are perpendicular to the longitudinal axis of said underlayment.  
   
   
       8 . The underlayment as claimed in  claim 5  wherein adjacent lines alternate in colour between a first colour and a second colour.  
   
   
       9 . The underlayment as claimed in  claim 6  wherein adjacent lines alternate in colour between a first colour and a second colour.  
   
   
       10 . The underlayment as claimed in  claim 7  wherein said lines that are parallel to said longitudinal axis of said underlayment are of a first colour and said lines that are perpendicular to said longitudinal axis of said underlayment are of a second colour.  
   
   
       11 . The underlayment as claimed in  claim 1  wherein said sheeting material is tar paper, roofing felt, rubber, extruded plastic, woven or extruded polyolefin or PVC.  
   
   
       12 . The underlayment as claimed in  claim 1  wherein said sheeting material is rigid.  
   
   
       13 . The underlayment as claimed in  claim 1  wherein said grid is comprised of a series of yarns, tapes or filaments.  
   
   
       14 . The underlayment as claimed in  claim 13  wherein said underlayment is a first colour and said yarns, tapes or filaments are a contrasting colour.  
   
   
       15 . The underlayment as claimed in  claim 14  wherein said underlayment is a woven scrim and said yarns, tapes or filaments are woven into said scrim.  
   
   
       16 . The underlayment as claimed in  claim 14  wherein said yarns, tapes or filaments are adhered to said upper surface of said scrim.  
   
   
       17 . The underlayment as claimed in  claim 14  wherein at least said upper surface of said sheeting material is coated, said yarns, tapes or filaments embedded within said coating on said upper surface.  
   
   
       18 . The underlayment as claimed in  claim 1  wherein said grid is comprised of a series of solid, broken or patterned lines.  
   
   
       19 . A roofing underlayment for placement over a roof substrate prior to the application of shingles, tiles or other roofing materials, the underlayment comprising a sheeting material having an upper surface and a lower surface, said underlayment containing a grid that is visually identifiable from above said underlayment when said underlayment is received over said roof substrate with said lower surface of said underlayment adjacent to said roof substrate, said grid comprised of a series of equally spaced apart lines that are parallel to the longitudinal axis of said underlayment and a series of equally spaced apart lines that are perpendicular to the longitudinal axis of said underlayment, said grid assisting in the alignment of said underlayment with said roofing substrate during application of said underlayment to said substrate and further assisting in the alignment of roofing materials applied over said underlayment.  
   
   
       20 . The underlayment as claimed in  claim 19  wherein said lines that are parallel to said longitudinal axis of said underlayment are of a first colour, said lines that are perpendicular to said longitudinal axis of said underlayment are of a second colour, and said sheeting material is of a third colour.  
   
   
       21 . A roofing underlayment for placement over a roof substrate prior to the application of shingles, tiles or other roofing materials, the underlayment comprising a sheeting material having an upper surface and a lower surface, said underlayment containing a grid that is visually identifiable from above said underlayment when said underlayment is received over said roof substrate with said lower surface of said underlayment adjacent to said roof substrate, said grid comprised of a series of spaced apart and parallel lines extending over at least a portion of said upper surface of said underlayment, said grid assisting in the alignment of said underlayment with said roofing substrate during application of said underlayment to said substrate and further assisting in the alignment of roofing materials applied over said underlayment.  
   
   
       22 . A roofing underlayment for placement over a roof substrate prior to the application of shingles, tiles or other roofing materials, the underlayment comprising a sheeting material having an upper surface and a lower surface, said underlayment containing a grid that is visually identifiable when said underlayment is received over said roofing substrate with said lower surface of said underlayment adjacent to said substrate, said grid comprised of a series of spaced apart longitudinal lines that are parallel to the longitudinal axis of said underlayment and a series of spaced apart perpendicular lines that are perpendicular to the longitudinal axis of said underlayment, said longitudinal and said perpendicular lines coloured to distinguish said lines from said sheeting material.  
   
   
       23 . The underlayment as claimed in  claim 22  wherein said longitudinal lines are spaced apart in pre-defined increments and arranged in blocks of lines of like colour, said grid including a plurality of said blocks of longitudinal lines with adjacent blocks of longitudinal lines alternating in colour.  
   
   
       24 . The underlayment as claimed in  claim 22  wherein said perpendicular lines are spaced apart in pre-defined increments and arranged in blocks of lines of like colour, said grid including a plurality of said blocks of perpendicular lines with adjacent blocks of perpendicular lines alternating in colour.  
   
   
       25 . The underlayment as claimed in  claim 22  wherein said longitudinal lines are spaced apart in pre-defined increments and arranged in blocks of lines of like colour and said perpendicular lines are spaced apart in pre-defined increments and arranged in blocks of lines of like colour, said grid including a plurality of said blocks of longitudinal lines and a plurality of said blocks of perpendicular lines, said adjacent blocks of longitudinal lines alternating in colour and said adjacent blocks of perpendicular lines alternating in colour.  
   
   
       26 . A roofing underlayment for placement over a roof substrate prior to the application of shingles, tiles or other roofing materials, the underlayment comprising a sheeting material having an upper surface and a lower surface, said underlayment containing a grid that is visually identifiable when said underlayment is received over said roofing substrate with said lower surface of said underlayment adjacent to said substrate, said grid comprised of a series of spaced apart longitudinal lines that are parallel to the longitudinal axis of said underlayment and a series of spaced apart perpendicular lines that are perpendicular to the longitudinal axis of said underlayment, said longitudinal lines being of at least a first colour contrasting to the colour of said underlayment, said perpendicular lines being of at least a second colour contrasting to the colour of said underlayment.