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Roof Underlayments

Underlayments work with metal roofing

McElroy Metal Inc.’s HydraShell MAX and HydraShell Supreme SA are synthetic underlayments. HydraShell MAX has a four-layer construction and is used under all types of finished roofing materials including steel roofing. It is suitable for roof pitches as low as 1/2:12. HydraShell MAX requires few fasteners and provides a durable deck cover. HydraShell Supreme SA is a peel-and-stick underlayment. It works in high-temperature, self-adhering applications. It has SBS-modified asphalt that provides pliability and a cool gray surface that reduces heat build-up.