Our sources
How We Research the Framing Field Guide
These guides help Minnesota customers understand framing decisions, compare scopes and prepare useful questions. They explain the work without turning a homeowner article into a structural design.
What the research uses
The library draws on APA — The Engineered Wood Association publications, the American Softwood Lumber Standard, Minnesota Department of Labor and Industry materials, official Minnesota rules, U.S. Department of Energy building-science guidance, official forestry resources and relevant manufacturer instructions. Source titles appear with each article. The underlying source addresses and claim checks are retained in the editorial research record rather than linked from the public blog.
Two foundational references are the APA Engineered Wood Construction Guide, Form E30X, revised December 2019 (the edition consulted), and Voluntary Product Standard PS 20-25, American Softwood Lumber Standard, January 2025. Current publisher topic pages supplement those references. Publication dates identify the source consulted; they are not claims that every source is the newest available technical document.
Minnesota comes first
A national model code, a manufacturer’s example and the rules adopted in Minnesota are different things. Code-related statements were checked against official state sources during preparation. The permit authority confirms the requirements and inspection process for the specific project. A rulemaking proposal is not treated as an adopted code.
What the articles deliberately do not provide
There are no generic beam sizes, load capacities, fastening schedules or field-repair recipes. Those decisions depend on the actual building, approved plans, products and design conditions. The articles instead explain which information matters, who needs it and when a customer should raise the question.
The illustrations are original concept diagrams, not project plans or photographs of Timberline work. They help identify parts and relationships; they do not establish construction dimensions or connections.
Keep the project record separate
An article can prepare you for a conversation. Your project’s approved drawings, accepted revisions, product instructions, written scope and inspection records document what is actually being built. Keep those records together, and bring any disagreement between them to the responsible project lead before the affected work proceeds.