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ShingleFelt™ 30 utility-grade underlayment complies with the important ASTM D4869 standard, yet is lighter and more economical than competing products. It provides a water-resistant layer beneath roofing shingles and wood shakes.
ShingleFelt™ 30
  • Complies with ASTM D4869, Type I
  • Roll Size: 432 sq. ft. (4 squares)
  • Coverage: 400 sq. ft.
  • Length: 144 ft.
  • Width: 3 ft.
  • Weight: 47 lbs./roll

Underlayment is used under asphalt shingles for a variety of reasons, such as providing:
  • backup for water-shedding protection of the deck if shingles fail from wind-driven rain. The lower the slope, the more important underlayment is, since water flows more easily under shingles on low slopes.
  • a protective barrier to the elements between the time the old shingles have been torn off and prior to the new shingle being applied.
  • an agent to hide minor imperfections of the decking material and reduce "picture framing" of deck panels.