This tool corrects a common and dangerous misconception in tiny house building: that you can vent a cathedral ceiling (vaulted ceiling) using Gable Vents.
It features an “Airflow Physics Simulator” that shows exactly what happens inside the rafter bays.
- Ridge + Soffit: Visualizes the “Stack Effect” creating a continuous wash of cold air under the roof deck (Safe/Dry).
- Gable Vents: Visualizes air hitting the first rafter and stopping, leaving the middle of your roof to rot (The “Dead Zone”).
- Hot Roof (Unvented): Shows how closed-cell foam works by eliminating the air gap entirely.
Roof Venting Visualizer
Ridge Vents vs. Gable Vents: Don’t rot your rafters.
1. Select Strategy
The Rafter Blockage Problem
In a standard house with an open attic, air flows horizontally from gable to gable. In a tiny house Cathedral Ceiling, the rafters act like solid dams. Air entering the gable vent hits the first rafter and stops. The other 20ft of roof gets zero airflow, cooking your shingles and breeding mold.
Hot air rises. By installing vents in the Soffits (bottom) and the Ridge (top), you create a natural chimney in every single rafter bay. As the roof heats up, it sucks cool air in the bottom and pushes hot air out the top, keeping the deck cool and dry.