Pipe Insulation

Old 10-11-03, 03:08 PM
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Pipe Insulation

I live in a Ranch on a slab in New Jersey. I am installing Base Board hot water heat. The pipe from the furnace to the radiators would be easier to install if I can run them through the attic. However, I am concerned about the pipe freezing or becoming partially frozen. If it is advisable to continue down this path. If so, what type of insulation should I use around the pipe?


Old 10-11-03, 03:57 PM
Narroc's Avatar
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Probably the best is fibreglass use at least 20-25mm wall or you could use that rubber stuff Amaflex. Also if possible try an allow the atatic insulation to go over the top of the pipe rather than under it so the heat from the house helps keep the pipe above freezing
Also if you are going up and then down again make sure you have provission for getting the air out of the high spots of the pipe. ie either a manual air vent or an automatic air vent , if you use an auto make sure the drain from vent is piped to were any leakage will be harmless.
Old 10-11-03, 05:37 PM
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Boiler pipes

With where you live I would keep the pipes down and not in the attic. With the bleeding and could be freezing Id keep them down. So if there is any heat loss from them it will be in the house not up in the attic. You can feed the pipe for the baseboard on around.Just go through a wall is all. Had one with a tub on outside wall fed the hotwater pipe behind it on into the next room. They loved it had a warm tub all winter. ED
Old 10-11-03, 08:49 PM
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Once you get the system in and leak-free, you could add some heating system anti-freeze (propylene glycol). Then even a power failure won't cause your heat pipes to freeze up. Use a 3:1 ratio. You will have to calculate what is required but don't go above 2:1 or you might get foaming in the boiler water. If you have to go into the attic because of it being a slab house, go ahead, just be sure to protect pipes from freezing.

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