What Types of Closed-Cell Rigid Insulation Are Waterproof?

Polyiso, XPS, and EPS closed-cell rigid foam board insulation offers efficient, water-resistant home insulation. It can serve as a vapor barrier in above- and below-grade home construction and remodeling applications.

The Flash-and-Batt Method - GreenBuildingAdvisor

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What Is the Difference Between Pink and Blue Foam Board?

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Continuous Rigid Insulation Sheathing

Owens Corning FOAMULAR 150 2 in. x 4 ft. x 8 ft. R-10 Scored Squared Edge Rigid Foam Board Insulation Sheathing 45W - The Home Depot

Protecting Walls and Foundations with Below-Grade Polyiso Insulation, 2021-04-14