Notch Layout & Tool Setup
Learn the step-by-step method for marking the horizontal seat cut and vertical plumb heel cut using a framing square and brass gauges. Understand the IRC one-third depth limit and why Height Above Plate (H.A.P.) determines the structural integrity of your roofline.
Comprehensive Field Guide • IRC R802 Compliant • Includes Step-by-Step Framing Diagrams
Slope & Angle Geometry
Demystifying 4/12, 6/12, and 8/12 pitch designations. How to measure pitch on existing structures with a 2-foot level, convert ratios into true degree angles, and calculate true rafter length multipliers using practical job-site arithmetic.
Pitch Multiplier Tables • Shingle Drainage Limits • Tape-Measure Examples
Critical Error Prevention
The number-one layout mistake in roof framing is cutting common rafters from building half-span without subtracting half the ridge beam thickness. Discover how unadjusted rafter lengths push exterior walls outward and how to mark the apex plumb cut properly.
Geometric Proof • Centerline Corrections • 1x vs 2x vs LVL Ridge Tables
Structural Hardware & Overhangs
How to calculate sloped rafter overhang tails from horizontal eave dimensions, execute clean plumb cuts for sub-fascia boards, and lock rafter assemblies against catastrophic wind uplift using Simpson Strong-Tie hurricane ties per IRC R802.11.
Uplift Load Schedules • Soffit Framing • Hardware Nailing Guides