Home>Discussions>INSULATION & HVAC>Does double brick chimney need liner for vented gas logs?
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glenviewjeff
Does double brick chimney need liner for vented gas logs?
glenviewjeff

We have a 100-year-old house with a double brick chimney, meaning there's an inner and an outer brick wall. The inner wall is reportedly in not-great, somewhat deteriorated shape. There is no clay or other lining, just a brick and mortar inner layer.

I'm wondering, could it ever be safe to use a chimney like this? It's my understanding that most of the flammable deposits that burning wood creates won't be present when using vented gas logs.

I have received three conflicting opinions by professionals, each possibly with a profit motive to be less than honest. One of the companies insisted that it would be unsafe to use the chimney without adding a modern liner, but based on evidence, they seemed to be the least trustworthy.

Jack
Re: Does double brick chimney need liner for vented gas logs?
Jack

You should install a liner for proper draft for the gas fireplace. The old chimneys are large and the amount of cold air in them can actually cause a downdraft that could push the exhaust into the house and secondly the flue gas of the gas fireplace is acidic and can cause further deterioration of the bricks. This can be a DIY project if you wish to save labor costs.

Jack

Benjamin
Re: Does double brick chimney need liner for vented gas logs?
Benjamin

yes our fireplace needs to be a functioning fireplace that can burn wood in order to use gas logs. That means your chimney also needs to be fully functioning and by what you describe it is not.

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