Homeowner needs to determine if existing gable vents and ridge vent are sufficient for metal shingle roof ventilation on a 1940s Cape Cod with doghouse dormers.

No clear guidance on whether gable vents plus ridge vent meet ventilation requirements for metal shingles on a specific roof design.

Severity

2Mild

Willingness to Pay

implied

Added

May 10, 2026

Workarounds Described

Posts question on Reddit to get opinions

Implied Software Gaps

Automated ventilation calculation tool that accounts for roof geometry and local climate

App Concept

VentCalc Pro

A web app that calculates required roof ventilation based on roof geometry, materials, and climate zone. Input roof type, vent types, and local code; get a compliance report and recommended vent configuration.

Key Features

Input roof parameters (slope, area, dormers, existing vents)
Calculate net free area needed per IRC/ASHRAE
Support for multiple vent types (ridge, gable, soffit, etc.)
Generate PDF report with diagram and recommendations

Target Users: Homeowners and roofing contractors doing residential re-roofing projects

Revenue Model: $9.99 per report or $29/mo unlimited for contractors

Existing Solutions Mentioned

gable ventsridge vent

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