Roof ventilation calculator:
give your roof room to breathe.
Start in the attic. Use this calculator as a conversation starter, then check the ventilation requirements for your home.
4 min readUpdated September 17, 2026Mammoth Field Guide
Before you start
The things to take away.
- The condition of a roof takes more than a look from the street.
- The Hunter-Gatherer inspection starts in the attic.
- The written Roof Grade comes with 75–150 photos.
The Roof Grade starts in the attic.
Roof Grade™By MammothKnow where
your roof stands.
The Roof Grade is free. The report is written.
What happens next is your decision.
- 32 inspection points, attic first
- 75–150 photos of what we find
- An honest, written recommendation
