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What underlayment materials are approved by Berridge for a watertightness warranty?

April 26, 2017Approved berridge Materials underlayment warranty watertightness

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What underlayment materials are approved by Berridge for a watertightness warranty?

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19. A: Underlayment materials approved by Berridge for a watertightness warranty include – Grace Ice & Watershield (40 mil.), Tamko TW Underlayment (40 mil.), Tamko TW Metal & Tile (75 mil.), and 30# felt. Note that any underlayment not listed above will require prior approval in writing from Berridge before use.