Roof Ventilation

JLC Field Guide: Roof Ventilation

Building codes and roof shingle warranties require that sloped roofs be ventilated for the following reasons: it lowers summer attic temperatures, extending shingle life and cutting cooling bills; it rids the attic of excess moisture; and it reduces the chance of ice dams by keeping the roof surface cold in winter.

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Roof Ventilation Update
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Roof Ventilation Update

The construction industry's leading researcher explains why what we think is true... More

An Ice Dam Analyzed
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An Ice Dam Analyzed

An engineer’s report shows that in snow country, soffit-to-ridge venting is... More

Roof Ventilation for Coastal Homes
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Roof Ventilation for Coastal Homes

Rhode Island builder Mike Guertin shares his strategies for beating leaks caused... More

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Vented vs. Unvented Roofs: The Great Debate

In a perfect world, air retarders and careful insulation details would keep moisture out of the roof. But real buildings are never perfect, and venting is still the safest approach, especially in cathedral ceilings. More

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Roof Ventilation Instruction

Calculating Attic Ventilation
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Calculating Attic Ventilation

Code requirements are based on attic square footage, but it's important to also... More

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Roof Venting in a Wet Climate

Q: I'm planning to reroof an expanded Cape Cod on a barrier island off the East Coast, where strong winds and moisture from the ocean are common. More

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Unvented Roofs and Shingle Warranties

While the IRC has approved the use of certain "hot" unvented attics, it seems that asphalt-shingle manufacturers still recommend that their shingles be installed over vented roof assemblies. Does this mean that shingle manufacturers will void their warranties if the roof deck is insulated with sprayed-in-place foam? More

Can Wind Short-Circuit a Ridge Vent?
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Can Wind Short-Circuit a Ridge Vent?

Q. Wouldn't a single-sided ridge vent be more effective than a standard ridge vent... More

Q&A: Can You Combine Ridge and Gable Vents?
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Q&A: Can You Combine Ridge and Gable Vents?

Q. I'm reroofing an older ranch house that has continuous soffit vent panels and... More

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