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GCP Roofing Underlayments

GCP roofing underlayments aim to provide best in class leak protection for your home. Starting with the tested and true favorite Ice & Water Shield GCP provides a variety of products to choose from, all with exceptional quality and value.

Roofing contractors and builders stake their reputations on quality workmanship. That’s why they trust our roofing underlayments to protect homes in the most extreme climates around the world, and architects choose our products because they meet the most demanding design requirements.


Ice & Water Shield® Self-Adhered Underlayment

Grace Ice & Water Shield® fully-adhered smooth surface roof underlayments provides best in class roof leak protection.

Its proprietary and time tested rubberized asphalt formulation has been proven to form a watertight bond with the roof deck and to seal around fasteners used to attach roof coverings.

When it comes to roof protection, insist on the original – Grace Ice & Water Shield®.

Grace Ice & Water Shield outperforms competition in 3 key areas.

Highest quality seal around roofing fasteners — Delivers best in class roof leak protection
Provides confidence that your client’s roof won’t leak

Best adhesion to the roof deck — Helps ensure watertight seal
Prevents costly leaks caused by ice dams and wind-driven rain

Forms superior laps — Provides watertight installation with NO special treatment of the laps
Premium leak protection without additional labor time

Ripcord® – Split Release On Demand —Makes it easier to waterproof detail areas such as valleys, chimneys,
roof to wall transitions
Robust protection of the roof’s most vulnerable areas

Grace Ice & Water Shield HT (High Temperature)

Grace Ice & Water Shield® HT is an excellent high temperature ice and water barrier that follows in the footsteps of the original Ice and Water Shield®, but is specially formulated to meet the higher service temperatures that often encountered in metal roofing systems. The product is formulated with a proprietary adhesive with temperature resistance of up to 260°F. The membrane forms a watertight bond to the roof deck, and seals around fasteners to around the nail of the primary roof covering and thus maintains its waterproof integrity on the roof deck. It also creates a strong bond to the roof deck and delivers optimal balance of adhesion & thermal stability for superior performance under the most demanding conditions.

  • 240°F Thermal Stability
  • Post-consumer recycled content
  • Slip Resistant Walking surface
  • UV Resistant Film provides 120 days of exposure time
  • Superior deck adhesion and lap strength
  • Membrane will not crack, dry out, rot or run

Grace Tri-Flex (Synthetic Underlayment)

  • Installs quickly – one roll equals 5 rolls of felt
  • Installs under shingles, tile, slate, metal or cedar shakes
  • 20 times stronger than felt – will not rip or tear away from nails
  • Allows you to dry-in (exposed up to 6 months)
  • Full 25 year warranty
  • Slip Resistant
  • Weighs only 28lbs

Grace Select® Self-Adhered Underlayment

A high performance, easy-to-apply, economical underlayment designed for use in wind driven rain applications and ice dams where code based standards of protection are sufficient.

  • Easy to handle and apply
  • Improved adhesion at low temperature while still repositionable, offering more versatility in application scheduling
  • Stronger film that exceeds tensile and tear requirements of AC48 resulting in a more durable underlayment
  • UV Exposure up to 90 days offering flexibility in construction schedules
  • Half the weight of granular (25 mm)
  • RIPCORD® “Split release on demand”
  • Re-roofable

Roof Detail Membrane (IWS)

  • Protection for Leak-Prone Roof Detail Areas
  • Easy to Install – RIPCORD “split release on demand”
  • Flexible flashing specifically designed for roofing details
  • Best Adhesion – time-tested rubberized asphalt formulation
  • Can be left exposed for up to a full 30 days
  • Highest quality seal around roofing fasteners