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Subtitle: 
Heat recovery ventilators bring fresh air into a house while exhausting stale air. Builders pull stale bathroom air through HRVs all the time — but what about greasy kitchen air?

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Powerful kitchen exhaust fans do a good job of removing cooking odors and smoke. They also have the potential to depressurize a house, causing water heaters to backdraft and pulling ashes out of the fireplace and onto the hearth.

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In the Q&A forum, Nick from Louisiana asked why these icicles appeared after he spray foamed the underside of his roof.

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When northern builders see icicles, they think “ice dam.” Heat from the living space leaks into the attic and melts snow on the roof; the water runs down the roof until it gets to the colder eave, where it freezes. When water backs up behind the ice dam at the eave, it can get under the shingles and leak into the interior.

In the north, icicles are often a sign of trouble.

In New Orleans, however, there is usually no snow to melt. Icicles coming out of a roof here represent something different. But they are still trouble.

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