The shelf life of GCP underlayments (GRACE ICE & WATER SHIELD®, GRACE ICE & WATER SHIELD® HT, GRACE ULTRA™, GRACE SELECT™, Roof Detail Membrane™, GCP granular underlayment , TRI-FLEX® and TRI-FLEX® 15) is highly dependent on storage conditions. In general, these products should be stored in their original, unopened packaging at ambient temperatures between 40–90°F (5–32°C) under dry conditions. GCP self-adhered underlayments have optimum initial adhesion to the roof deck if used within one year from the date of manufacture.
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Last Updated: 2019-03-12