The book that governs the job.

$99one time
Yours permanently. Or reach every course with all-access.
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The drawings show you where things go. The specifications tell you what they have to be, how they get installed, and what the inspector will hold you to. When the two disagree — and they will — the specs usually win. This course teaches you to find what you need in a spec book fast, and to spot the requirements that will cost you money if you miss them.

Taught by Aaron Gaddy
30+ years in commercial construction. Every module here comes out of jobs he actually ran — the drawings, the mistakes, and what they cost.
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Module 1 is the free preview. Its page is up now, and the video lands there first. Try it.