High Performance Roof Underlayment

Rainproof-40 High Performance Roof Underlayment™ is a cold applied self-adhering SBS modified, rubberized asphalt sheet waterproofing underlayment. Rainproof-40 is internally reinforced with a strong non-woven polyester fabric. The membrane has a white reflective fabric topping. It is used as a complete waterproof roofing underlayment on new and retro-fit* roofs under most roof coverings. Can be used at low slope areas, Hip, Ridge, Valleys, Rake edges, Confined Rake edges,around skylights and chimneys.


  • 12 month exposure rating
  • Fully self adhered roofing underlayment system
  • 2½” zip strip release liner for ease of edge overlap adhesion
  • Durable White reflective topping for added footing safety and heat reduction
  • Seals around properly installed fasteners
  • Can be installed Horizontally or Vertically (as code allows)
  • Can be installed on roof pitches down to 2”/12” (for lower slopes contact your Protecto Wrap Representative.)

Click on link below to download sheet.