About ExteriorCalc
ExteriorCalc is an independent construction calculation and material takeoff platform launched on September 27, 2026. Built specifically for residential siding, rainwater drainage, and roof edge ventilation planning, its goal is to provide fast, reliable, and mathematically transparent estimates.
Team & Authorship
Alish Gautam
Developer of ExteriorCalc
Alish Gautam is a software developer who built ExteriorCalc from published building standards and manufacturer technical specifications. He is not a licensed building contractor.
He developed ExteriorCalc to turn published building codes and manufacturer reference tables into accessible, interactive estimation tools.
- •Web application development and calculation logic
- •Implementation of formulas from published trade manuals and model codes
- •Site architecture, performance, and maintenance
How Calculations Are Developed & Validated
ExteriorCalc relies on a structured verification workflow to ensure calculation models remain accurate, reproducible, and aligned with standard trade practices:
Formulas and variables are sourced directly from published code and trade references, including the International Residential Code (IRC Sections R703, R806, R903), SMACNA Architectural Sheet Metal Manual guidelines, and manufacturer technical specifications.
Alish Gautam translates geometric equations and material packaging constraints into client-side TypeScript calculation algorithms designed for clear browser execution without premature rounding.
Calculation models are cross-referenced and benchmarked against standard engineering formulas, reference publications, and published drainage and material tables.
Formulas, variable definitions, worked examples, and underlying assumptions are openly published alongside each tool. Automated test suites in the codebase verify computational consistency against manufacturer specifications.
Editorial & Corrections Policy
We are committed to maintaining accurate, transparent estimation tools. If a manufacturer updates its packaging specifications, an authority having jurisdiction amends ventilation code exceptions, or an error is identified in a calculation model, we investigate promptly and update the affected utilities.
Users, contractors, and estimators who identify a calculation discrepancy, outdated standard reference, or error can submit feedback directly via our Contact Page or by emailing [email protected]. Verified corrections are logged and reflected in the tool's underlying calculations and documentation.
Scope & Professional Verification Notice
ExteriorCalc is designed to assist estimators, builders, and homeowners with preliminary planning and material budgeting.
ExteriorCalc calculations are based on standard mathematical models and published building codes. Because local building codes, framing tolerances, microclimates, and manufacturer warranty conditions vary by jurisdiction, ExteriorCalc calculations do not replace professional on-site engineering, architectural services, or municipal code inspection. Always verify critical dimensions and plans with a licensed local contractor or building official.