Uniguard Premium UL30 underlayment
This is a listed roofing assembly. Listing 8180-2437:0001. This site cites OSFM BML. Match the model and orientation.
Master Roofing Solutions LLC listing 8180-2437:0001 in OSFM category 8180 (non-wood roof covering/assemblies for wildland urban interface (w.u.i)). Uniguard Premium UL30 underlayment
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