Georgia Roof Guide

Why is attic ventilation important?

Short answer. Attic ventilation is important because it removes the two things that destroy roofs from the inside: heat and moisture. In Georgia, long humid summers bake attics and stress ducts, and cold snaps make household moisture condense on the roof deck, so a balanced intake and exhaust system protects the decking, extends shingle life and keeps warranty coverage intact.

Job 1: control summer heat

A Georgia attic under dark shingles routinely runs far hotter than the outdoor air on summer afternoons. Ventilation does not make it cool, but it keeps heat from building unchecked, which slows shingle aging and limits heat soaking into insulation and ducts.

Job 2: carry away moisture

Showers, cooking and everyday living add moisture to indoor air, and some of it leaks into the attic. Georgia's humid outdoor air adds more. Moving air keeps the deck from absorbing it.

Job 3: prevent winter condensation

On cold nights the deck can drop below the dew point of leaked house air, creating frost that melts into drips when the sun returns.

Job 4: meet warranty and code requirements

Shingle manufacturers generally require ventilation that meets code, and the residential code sets minimum vent area for attics.

What happens without it

Robust Roofing explains the inside-out failure in its guide to attic ventilation in Georgia. Also read heat, humidity and roof life and how long a roof lasts in Georgia.

In depth

How much attic ventilation does a Georgia roof need?Attic ventilation for Georgia homes: intake and exhaust balance, the IRC R806 1/150 and 1/300 rules with workeDoes a hot Georgia attic shorten the life of your shingles?How hot Georgia attics and shingles get, what research says about ventilation and shingle life, and when radiaRidge vent or box vents: which is better, and can you use both?Ridge vents vs box vents, turbines and power fans for Georgia attics: how each works, why mixing exhaust types

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