TL-0004 — Slope Requirements Technical Letter

GCP’s underlayments (GRACE ICE & WATER SHIELD®, GRACE ICE & WATER SHIELD® HT, GRACE ULTRA™, GRACE SELECT™, GCP granular underlayment, Roof Detail Membrane™, TRI-FLEX® and TRI-FLEX® 15) are intended for use on sloped roofs and are not intended to be used as waterproofing on flat roofs.

A good rule of thumb is that the product is appropriate at whatever slope is normally acceptable for the specific sloped roof covering. For example, if the roof covering on a specific project is designed for slopes of 3 inches in 12 inches (7 cm in 30 cm) or higher, then GCP’s underlayments under that roof covering are also appropriate at slopes of 3 inches in 12 inches (7 cm in 30 cm) or higher.

GCP’s underlayments should not generally be used at slopes less than 2 inches in 12 inches (5 cm in 30 cm). Refer to product data sheets for further details.

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Last Updated: 2023-06-28

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