The Johns Creek Bathroom Remodel Nobody Budgets For: Ventilation

Every bathroom remodel budget has tile, fixtures, vanity, and labor. Very few have a line for the exhaust fan, and that's how a freshly remodeled bathroom ends up with mildew along the ceiling line by its second summer.

In Johns Creek, with humid summers and houses built to a schedule, this is the most common preventable failure we see.

What Johns Creek builders installed, and why it is not enough

Builder-grade bathroom fans are chosen to meet code at the lowest cost. In practice that usually means three problems:

1. Undersized for the room. It's often a fan sized for a powder room, installed in a full bath with a shower.
2. Vented into the attic, not to the exterior. This is common, and it's the worst version: the moisture leaves the bathroom and condenses on your roof sheathing instead.
3. Wired to the light switch, so it only runs while somebody is in there. The room needs to dry after they leave.

Any one of those can turn a sealed, freshly tiled bathroom into a humidity trap.

What proper ventilation looks like

The fix isn't glamorous, and it costs little compared to tile:

• A fan sized to the room, not to the price point.
• Ducted to the outside with as short and straight a run as the framing allows, and insulated where it crosses unconditioned space.
• On a timer or humidity sensor, so it keeps running after the shower stops. This one change does more than everything else combined.

Adding or relocating a fan is electrical work, and in Johns Creek, residential work is permitted through the City of Johns Creek. A remodel that adds a circuit or relocates the fan will generally need a permit, so factor that in when you set the schedule.

Waterproofing is the other half

A fan removes the moisture in the air, while waterproofing stops the water that never evaporates.

Proper waterproofing behind the tile is part of the build, not an upgrade. Tile and grout aren't waterproof; the membrane behind them is. When a shower fails at a corner or the curb a few years in, the tile is almost never the cause.

Good waterproofing and a correctly sized, properly vented fan are what protect the new finishes from mildew and peeling.

What it changes about the timeline

A standard bathroom remodel typically runs two to four weeks depending on tile work, fixtures, and any plumbing relocation. Ventilation work fits inside that window and doesn't add much time.

What does add time is finding out about the attic duct after demolition. Checking where the current fan actually vents before anything is ordered takes ten minutes in the attic, and sometimes it changes the plan.

One question worth asking

Go into the attic and find out whether your bathroom fan duct ends at a roof or wall cap, or just ends. If it just ends, fixing that comes first, whatever else you were planning.

See how we handle bathroom remodeling in Johns Creek and tell us what you found.