Component Manufacturing dverti$ dverti $ er
Don’t Forget! You Saw it in the
October 2022 #14279 Page #90
Because Good Ingredients Matter By the MSR Lumber Producers Council
ince the 1960s, fabricators have used machine stress rated (MSR) lumber of all species to improve the performance and reliability of their engineered components and structures. Nowadays, you don’t have to look far to find a successful component manufacturer who relies heavily on MSR grades to produce high quality roof trusses, floor trusses, and wall panels. While the reasons to use MSR are numerous, they all boil down to one word: quality. Rigidply Rafters in Richland, Pennsylvania, is a family-owned operation that has been building roof and floor trusses since 1963. President Vernon Shirk says the company has been using MSR in their products for more than 35 years. “It’s really helped our business,” he says. “We know it’s something we can count on. We are providing an engineered product, so MSR is crucial to that.” Dave Kipp, Purchasing Manager for Structural Component Systems (SCS) in Fremont, Nebraska, agrees. “We’ve been using MSR pretty much since day one when SCS was founded in 1987,” he says. “It’s a crucial element for roof and floor trusses, especially with today’s challenging designs for residential and commercial construction.” “By using MSR, we reduce the overall fiber required for the design of our products,” says Kipp. “For example, a top chord on a roof truss might require 2x6 if only #2 is available but that can often be replaced with a 2x4 in MSR. Likewise, floor trusses may require more webs if the chords are #2 but using MSR can allow us to reduce the number of webs and/or the size of the connector plates used.” Clear span flexibility is another benefit of MSR’s consistent strength values enjoyed by companies like Rigidply. “One of our specialties is large span trusses for ag and commercial projects (60-100’ clear span),” explains Shirk. “MSR helps in that part of the business, too. Designers can rely on MSR properties, use full-design strength, and avoid overbuilding.” Why is MSR key to a quality truss? In contrast to visual grades, machine rated lumber production is centered on measuring the physical properties of each piece of lumber on the line. MSR manufacturers are required to test samples during each shift, and independent third parties audit the entire quality assurance process to confirm conformance with published design values. This testing process verifies that production consistently meets design value requirements even as timber growing practices and environmental conditions change. The result? Component manufacturers have confidence in MSR’s higher strength values, which in turn provides greater design flexibility. This allows truss designers to optimize the lumber in each truss, resulting in a more efficient use of materials and lower installed costs.
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