A splice is the point where two chord members are joined together by a metal connector plate to form a single member. It can occur at a panel point or between panel points depending on the specific design of the truss and the preferences of the truss manufacturer. While the program checks all...

Oftentimes, MiTek engineers are getting requests for repairs of trusses installed out of plumb. This is a common installation issue and has some allowable tolerances. Tolerance is critical for both a good roofline and effective bracing. Exceeded erection tolerance can cause overloading,...

Metal plate connected roof and floor trusses are used widely in residential single family, multi- family, commercial, and agricultural construction. They provide design flexibility, span greater distances than traditional “stick framing,” and allow faster erection of the roof system...

MiTek engineers are often asked what maximum gaps are allowed for wood member-to-wood member in metal-plate-connected wood trusses. Gaps between wood members are addressed in Chapter 3 Quality Criteria for the Manufacture of Metal-Plate-Connected Wood Trusses of the ANSI/TPI 1-2014 (National...

As a component manufacturer, you enable better building. As a partner to CMs across the country, MiTek does the same — from advanced design software and automated production equipment to innovative and integrated technologies that lead to a more profitable and stable future for your...

Top chords are usually braced by roof sheathing. Roof sheathing provides effective lateral bracing when nailed directly to the top chord. In cases where roof sheathing cannot be directly applied to the top chord, purlins are used to prevent lateral buckling of truss top chords. The Truss...

MiTek Engineering software gives you two options to input snow load – Ground Snow and Roof Snow (flat roof snow). What is the difference between ground snow and flat roof snow? Ground snow load, pg, is obtained directly from the American Society of Civil Engineers Standard (ASCE 7)...

Lumber has ability to handle higher stresses under shorter periods of time. This characteristic is known as Load Duration Factor. Load Duration Factor typically ranges from 0.9 to 1.6 and is based on the amount of cumulative time the load is applied to the structure. Per the National Design...

When designing trusses for special loads or special conditions, it is important to define the individual truss members correctly. Without proper member definitions, trusses could be inadvertently under-designed and/or have incorrect analog. The most common member types are webs and chords. Top...

Trusses are designed as individual components to resist the in-plane stresses resulting from the loads applied in the same in-plane direction. To resist out of plane forces, adequate bracing/restraint is required. In absence of designed temporary and permanent bracing plans, BCSI (Building...