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thinksincode 12-08-2011 03:06 PM

Insulating pipes with foam insulation
Hi plumbing experts,

I picked up some Frost King PE foam pipe insulation for the basement. I have a few questions.

First, the hot water coming from the water heater. How close can I get to the heater without a flammability hazard with the water heater's flue? I think I recall something like six inches, is that right?

As for the other, cold water pipes - should I be insulating those too? The supply pipe coming in from the floor, the cold water pipe going into the water heater, ..., ? Will the PE foam insulation help at all to prevent freezing, or should I only put it on the hot water pipe(s)?

Thanks! :thumbup:

plumbing 12-08-2011 03:12 PM

Hi, are these copper? or are they pex/zurn "Plastic pipe" ?

plumbing 12-08-2011 03:23 PM

Also the stub-outs on the water heater require a special insulation it's blackish grey "with that insulation you can go right to the tank!". also i would give spray foam 8 inches just to be safe. but i usually only spray foam around hose bib and where pipe goes through Joyce/stud and yes it would prevent it from freezing, but also you should always disconnect your hose during winter to prevent freezing. I would only insulate hot/cold where pipe is near hose bib or near wall for freezing purposes. then i would only insulate HOT only when cold is a good couple feet away from slab/wall.

thinksincode 12-08-2011 03:35 PM

1 Attachment(s)
Hi plumbing,

Sorry I forgot the pipe type. They are copper.

I disconnected my hoses and turned off the valves for the pipes going outside, I was just wondering if adding the foam insulation on the cold pipes would help prevent freezing or if I should only bother with the hot water.

Also it's not spray foam, but pre-slit PE foam that you place around the pipes then seal with tape (I attached a picture of what I'm using).

plumbing 12-08-2011 03:49 PM

Sorry i am getting confused with other posts, and that's the stuff! it will help keep your Hot water hot longer when not used for a while and cold water from getting frozen so i would insulate from main to the heater then to hose bibs and hot from the heater then i would do the hot the rest

mnp13 12-08-2011 04:03 PM

Putting it on the cold pipes will also help with condensation in the summer

thinksincode 12-08-2011 04:06 PM

Great, thanks guys!

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