What does it take to properly finish an attic, and what mistakes cause trouble later?
Short answer. A properly finished attic has a continuous air path or a correctly built unvented roof above every sloped ceiling, sealed and insulated knee walls, code compliant headroom, stairs and egress, and its own cooling. Most problems in finished attics come from skipping one of those: rafter bays stuffed with insulation and no vent channel, air leaking around knee walls, or a sleeping room with no escape window.
Mistakes that cause heat and moisture problems
- No vent channel in the rafter bays: insulation packed to the deck with no baffle, so the sloped ceiling traps heat and moisture under the shingles.
- Vent channels that go nowhere: baffles installed but no soffit intake below or ridge vent above.
- Leaky knee walls: insulation stuffed in the wall but no air barrier on the attic side, and the floor of the side attic left open to the joists below.
- Recessed lights in sloped ceilings that are not airtight.
- No dedicated cooling, relying on a single duct off the main system.
Code items inspectors check
- Ceiling height: generally 7 feet for habitable rooms, with sloped ceilings allowed when at least half the required floor area meets 7 feet and areas under 5 feet are not counted.
- Stairs: a permanent stair; a pull down ladder does not make a habitable room.
- Egress: an emergency escape opening in sleeping rooms.
- Smoke alarms and, where required, carbon monoxide alarms.
- Floor structure rated for living space.
Roof items to settle first
- Any stains or soft decking repaired.
- A ridge vent above vented rafter bays.
- If the roof is near the end of its life, replace it first.
Pull a permit; it protects resale and insurance. See roof ventilation basics and roofing permits in Georgia.