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Improve attic ventilation

$350-$550 Est. time: 3 - 5hrs High
A
A
B
B
C
D
E

Tasks and Notes

A
Seal gable vents.
B
Change half-bath fan vent.
C
Redirect hall-bath fan vent from gable vent to roof.
D
Consider removing plastic covering on east and west attic walls.
E
Frost on sheating from moist air.

Description

The attic is affected by the curse of too much ventilation options. There are soffit, gable, roof, and ridge vents. This is preventing good airflow across the entire height of the space. There was frost on many areas of the roof sheathing, suggesting the moist air is not being adequately vented out. Frost is not itself a problem, but the moisture created when it melts makes the attic vulnerable to mold and rot. We recommend consulting an attic specialist to seal the gable vents to ensure there is an uninterrupted flow of air from the soffit vents at the bottom of the space to the ridge vent at the top of the space.

We also noticed plastic coverings on the east and west attic walls. These will serve to trap moist air and also pose a moisture damage risk. Consult a specialist to be sure, but we recommend removing them.

The half-bathroom fan is a dual lamp/fan unit. It is currently venting to an incorrect passive vent. This is evidenced by the melted frost all around the vent. Exhaust fans need to be ducted through the attic to a vent hood with a damper, designed for exhaust, that will prevent the moisture the fan is discharging from re-entering the attic and causing rot.

And especially if the gable vents are to be sealed then the hall bath fan which is currently connected to the east gable vent needs to be redirected to an appropriate roof vent.

If Not Addressed

Moisture in the attic is the main consequence of poor ventilation. This leads to mold and rot damage.

Estimated Costs

We estimate labor costs for this project will be about $250-$350 and material costs of about $100-$200. These costs will fluctuate based on the actual conditions the electrician encounters. Request quotes from at least 3 professionals.

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