Doug welborn Posted September 10, 2008 Report Share Posted September 10, 2008 The gas heating unit was in the basement, the first 5 feet was double wall pipe and then it went into a single wall pipe. Am I Image Insert: 108.09 KBcorrect that it should be double wall pipe through the floor, walls, and ceiling. Thanks Doug. Quote Link to comment Share on other sites More sharing options...
msteger Posted September 10, 2008 Report Share Posted September 10, 2008 What sort of clearance to combustibles existed from what you can tell? I can't imagine enough clearance exists above this area. I would have done double wall (B) the entire length. What's that 'expandable foam' stuff on the connector pipe? Looks weird to me. Quote Link to comment Share on other sites More sharing options...
Bain Posted September 10, 2008 Report Share Posted September 10, 2008 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." Quote Link to comment Share on other sites More sharing options...
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