I recently had a high efficiency furnace installed that vents through the wall. They put a liner in the chimney for the water heater. Can I insulate right up to the chimney in the attic now, instead of leaving the 2″ required gap?
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Read the installation manual.
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Follow mfg recommendations ... or talk to the BO, too. He will likely tell you to follow the mfg recommendations ... if you don't, you risk voiding the U-L listing and putting your *ss on the line if your house burns. If it is a high efficiency furnace, is the flue plastic/PVC? If so you should be able to insulate against it.
Misunderstood the question ... You should be able to insulate up to the chimney ... Is the liner surrounded by e.g. grout, now? Talk w/ the BO to make sure, though.
Exisiting chimney, house built 1963, only gas water heater now vents through it. Contractor put a metal liner of smaller diatmeter so the water heater would vent properly now that the funace no longer uses the chimney.
I'd guess there should be no issues really. I'd recommend sealing around the liner to prevent cold air from settling in around it. Maybe that was already done when the liner was installed. Double check w/ the BO maybe, though.