Beam Span Engineering
Subject: Span 50 feet or span 10 — the engineering is not the same
Preview: Why longer spans don’t just cost more — they require a completely different approach.
Hi [First Name],
Most people think of beam span as a size question. It is really an engineering question — and the answer changes everything about materials, connections, and cost. A 10-foot span and a 50-foot span are not the same problem scaled up. They are fundamentally different problems.
The Physics
Why Longer Spans Change Everything
Double the span and the bending stress roughly quadruples. The beam does not just need to be bigger — it needs to be fundamentally different. At 8–14 feet, standard solid timber handles the load. Past 24 feet, you are into glulam or engineered trusses. Past 36 feet, you are looking at steel-and-timber hybrids with every connection individually designed.
The Post Math
A 40-foot pavilion with a center post = two 20-foot spans.
Remove the center post = one 40-foot span.
Same footprint. Same roof. But the engineering required is not twice as much. It is several times as much. Removing a post can cost more than adding one.
A beam can be strong enough and still deflect too much — sagging visibly under load even though it is structurally safe. Longer spans amplify this. And the connections holding everything together become critical load paths, not just fasteners. Our Dovetail Difference® connections are engineered for the specific load path of each structure — not a generic template scaled up.
If a builder quotes you per square foot without asking about your span requirements, post placement, and load conditions — that is not a quote. That is a guess.
The questions to ask any builder: “What is the longest unsupported span in my design? What material does that require — solid timber, glulam, or a hybrid? How does removing or adding a post change the engineering and the cost?”
We walk you through the span options, show you where the engineering shifts, and help you find the sweet spot between the open feel you want and the budget you are working with. Reply with your project details and I will walk you through it.
To great outdoor living,
[Name]
Western Timber Frame
[Phone] | [Email] | westerntimberframe.com
Western Timber Frame, Inc.
2026 U.S. Small Business Administration
Utah Manufacturing Small Business of the Year
