Parallam® Plus is typically specified for outdoor decks or applications where the member is exposed to direct rainfall. If the member will be exposed to direct rainfall then preservative treated wood, like Parallam Plus, is required. Otherwise, it is up to the design professional to decide if a pressure treated product is needed. Applications where wood members are exposed to atmospheric moisture only (porch roof framing without a finish ceiling or floor joists over a crawlspace, as examples), are generally considered 'Dry Use'. Dry use is defined as an environment where the in-service moisture content of the member is less than or equal to 16%.
Please refer to Specifiers Guide TJ-7102 for more information.