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Note

Attic ventilation, and why roofers keep raising it

The cheapest thing you can do during a re-roof, and the one most likely to be skipped.

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Note1 min readDana Point, CA

Two openings, in balance

A roof needs air coming in low at the eaves and leaving high at the ridge. Intake and exhaust have to be roughly balanced; more exhaust than intake simply pulls conditioned air out of the house.

What happens without it

Trapped heat cooks the covering from underneath and takes years off it. Trapped moisture condenses on the deck, and over enough winters that softens the sheathing. In cold climates it is also what turns roof snow into an ice dam.

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What best describes your home?

Different buildings need different crews, so this is the first thing a roofer asks.

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Why it gets skipped

It is invisible, it is not on the brochure, and it makes a quote look more expensive next to one without it. It is also, hour for hour, the cheapest way to make the next roof reach its rated life.

What to ask

What is there now, what should be there, and what is being changed. If the answer to the third question is nothing, ask why not.

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