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IB-3™ StormStopper is a self-adhering, 50 mil, mineral surface roofing underlayment for use under shingles, tile, and other types of roofing. It is constructed from a strong layer of mesh bonded to rubberized asphalt and coated with black stone granules. Comes with a non-removeable selvedge edge for a secure seal on overlaps.

IB-3™ StormStopper installs under roofing at the edges and valleys to protect from leaks due to ice dams, meltingsnow and blowing rain. IB-3™ StormStopper is suitable for use in new construction and reroofing.

IB-3™ StormStopper Features

  • 50 mil nominal thickness

  • Non-removeable selvedge edge for secure seal on overlaps

  • Installs in temperatures above 40°F

  • Minimum slope for installation is 2" per foot

  • Applies easily at eaves, valleys, vents, skylights and chimneys

  • Easy to remove split release liner for fast installation and ideal for valley applications

  • Self-seals around common fasteners

  • May be left exposed for up to 30 days

  • 5-Year limited warranty


  • ASTM D 1970

  • ICC-ES ESR 1737

  • Florida Building Code FL 11842.1

  • Miami-Dade County Approved

  • Texas Department of Insurance Listed

IB-3™ StormStopper

ProductProduct IDSizeUnits/CartonCarton Wt.
IB-3 StormStopper4736836” x 67’168 lbs
MFM IB-3™ StormStopper

Roll Size: 36" x 67' (2 Square)