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Hvac -gas venting

Doug welborn

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You have to install a B-vent in unconditioned areas.

I'm constantly amazed by the many uses homeowners--and some builders--find for Great Stuff foam. I recently had a call from a builder who said, "But wait. Read the can. It is rated for exterior use if you coat it with polyurethane."

I reminded him that there was no poly on the ugly gobs of yellow pus oozing out of his shiny new house.

"Well, no," he said. "We haven't gotten around to it yet."

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