Zero Guesswork On-Site

Building Code Math & Vector Framing Calculators

Eliminate job-site cut errors. Framing Foundry generates true 1:1 scale vector cut sheets, running tape layouts, and automatic IRC/NBC code validation checks.

Stair Stringer Calculator

Computes exact unit rise, unit run, stringer drop for tread thickness, throat depth validation, and cumulative running tape layouts.

IRC R311.7 Compliant

Common Rafter & Birdsmouth

Roof pitch to true line length solver. Accounts for ridge board deduction, birdsmouth seat cuts, and maximum allowable notch depth.

IRC R802 Compliant

Baluster Spacing & Railings

Railing infill layout validator. Enforces the strict 4-inch sphere opening rule and outputs on-center and edge-to-edge tape markings.

4″ Sphere Rule Validator

Deck Joist Span & Cantilever

Calculates allowable joist spans and maximum overhang cantilever lengths across Southern Pine, Douglas Fir, and SPF lumber.

IRC Table R507.6

Nominal vs. Actual Lumber Chart

Full reference table of surfaced lumber sizes (2x4, 2x6, 2x8, 2x10, 2x12), cross-sectional properties, and dry density weights.

Full Reference Table

Residential Code Cheat Sheet

Summary of IRC 2024 and NBC requirements for minimum ceiling heights, stairway geometries, handrail profiles, and fastener schedules.

IRC & NBC Standards

Why Precision Framing Geometry Matters

In residential carpentry and timber construction, small rounding discrepancies at the start of a project multiply across a structure. When cutting stair stringers or laying out rafter birdsmouth notches, a 1/16-inch error compounded over 14 steps causes the final riser to fail municipal building code inspections by nearly an inch.

Continuous Cumulative Tape Layouts Marking each notch by moving the tape measure introduces compound tool-width errors. Framing Foundry calculates running tape measurements anchored to a single datum point.

Active Code Validation Our engines check International Residential Code (IRC) and National Building Code of Canada (NBC) requirements in real time, alerting you to maximum riser and minimum throat limits.

Vector Cut Sheets Output crisp, resolution-independent vector diagrams for clear review in the shop or on job-site mobile devices.