Topical sealers are compatible with Trus Joist® products, but there is no guarantee that it will provide any real protection from the weather, and is certainly not a substitute for a properly specified pressure preservative treated wood product.
Paints and sealers are sometimes used to increase the durability of Trus Joist® products during construction delays with mixed results, but the best solution is to protect the products from exposure by covering the materials or getting the building closed-in as soon as possible. For more information on products left exposed during construction delays, refer to this article.
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