What Is Attic Insulation and the Roof?
Insulation sits on the attic floor; the roof breathes above it. The two meet at the eaves, where insulation pushed into the rafter bays blocks the intake ventilation the roof depends on. Rafter vents (baffles) hold a clear channel from the soffit vent up into the attic so intake air can move. When intake is blocked, exhaust vents at the ridge pull conditioned air from the house instead, attic temperatures climb, and shingles age faster from below. A roof replacement is the one time the top of the insulation and the eave channels are easy to see and correct. Radiant barriers on the underside of the deck, spray foam that converts the attic to a conditioned space, and blown-in insulation depth each change what ventilation the roof needs, so the insulation approach and the ventilation design have to be decided together rather than by different trades on different days.
Important Distinction
Note: This describes the component in general. Which product, gauge or detail a specific roof needs is a job-by-job determination made after an inspection, and the building code and the manufacturer's installation instructions govern over any general description.
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Also Known As
These are the search terms and phrases that commonly refer to this topic, so you can find it however you describe it.
How Attic Insulation and the Roof Relates to Other Topics
Insulation at the eaves decides whether intake ventilation exists.
A radiant barrier changes what ventilation the roof needs.
Questions about Attic Insulation and the Roof?
Zilker Roofing inspects before recommending. Honest assessment, no pressure.