While Weyerhaeuser has not conducted specific research on these products used as roof framing in salt storage buildings, some things to consider include:
- Trus Joist products must be limited to covered end-use installations that provide a dry-use condition. A dry-use condition is one where the material is less than 16% moisture content during the life of the structure. Though it is ultimately up to the designer of record, roof framing that is open to the air but covered and sheltered from direct moisture generally is considered a dry-use condition.
- Weyerhaeuser engineered wood products will act similar to dimension lumber when exposed to salts. A good way to think of it is if something is harmful to dimension lumber (doug-fir, SPF, etc) it will be harmful to engineered wood products as well.
- Depending on actual material stored, the American Wood Protection Association (AWPA) should be referenced to determine if treated wood is required for the specific application of the building being designed.
- While salt storage sheds are not meant to be “forever” structures, it is up to the Designer of Record to decide what product is best for the specific application. It should be noted that any damage caused by moisture or salts in this application would not be covered under our product warranties.