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Learning Units (Hours)
Course
Quiz
Jeffrey Syken
When it first appeared on the market (in the first decade of the 20th Century), �Metal Lumber� was meant to provide a substitute material for wood framing - mainly for residential structures. At that time, fire and termite resistance were the main attributes accredited to this new method of framing. Even so, the many �sustainable� characteristics of Light Gauge Metal Framing (as it came to be known in the post-WWII era) were readily apparent: lightweight, dimensionally stable, inedible, incombustible, piece-for-piece replacement, mechanical attachment etc. In the days before power tools, LGMF (a.k.a. �Cold-Formed/Rolled Metal Framing�) had its shortcomings. Cutting and joining were problematic and inefficient, to say the least. In particular, passing MEP (Mechanical/Electrical/Plumbing) through the webs of joists was not easily achieved. Nailing slots gave way to self-tapping/piercing screws for easy and secure joining of members and pre-punched holes in joists now allow easy passage of MEP through LGMF joists without diminishing their structural integrity, effectively making the web of the joist a plenum space. With the advancements in technology came the recognition that LGMF was/is the most logical, sustainable alternative to wood framing. Steel�s recycled content and recyclability has no equal. The familiarity of LGMF components makes the transition from wood to LGMF quick and easy for �stick builders.� Even LGMF�s main shortcoming: �Thermal Bridging,� can be overcome using several methods including thermal studs/breaks and insulating sheathing. To make the use of LGMF for residential structures more efficient, the Prescriptive Method provides pre-determined tables, details and specifications, making LGMF a sustainable alternative to wood.
This course includes a multiple-choice quiz at the end, which is designed to enhance the understanding of the course materials.
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