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Old 10-30-2013, 06:48 AM  
drewdin
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Default Insulating Pipes in a crawl space

I'm going to insulate the hot water lines in my crawlspace, at the box stores they have a rubber insulation and a fibreglass insulation for 3/4" copper. My question is which one is better and why?

I asked the Guy at Lowes/Depot and I might as well have asked the wall. Thanks



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Old 10-30-2013, 07:13 AM  
nealtw
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All foam is not equall but I think some have a higher R value than FG just keep it 10 inches away from heat like furnance flue. Fibre glass is used for higher temp, steam pipes and such. I would do both hot and cold for the condension in summer.



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Old 10-30-2013, 11:00 AM  
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Thanks Neal, I actually planned on using the foam covered by FG, just for the Crawlspaces. Might be overkill but i wanted to make sure it was warm no matter what! Thoughts?

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Old 10-30-2013, 06:58 PM  
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It's not really expensive I don't see why not.

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Old 10-31-2013, 10:20 AM  
eddietheplumber
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Quote:
Originally Posted by drewdin View Post
I'm going to insulate the hot water lines in my crawlspace, at the box stores they have a rubber insulation and a fibreglass insulation for 3/4" copper. My question is which one is better and why?

I asked the Guy at Lowes/Depot and I might as well have asked the wall. Thanks
Hot water lines sweat if u use the fiberglass it will soak up the sweat and can get wet enough to freeze in the winter.if u use rubber it in my opinion drys better and as long as u tape the bends also u will b fine
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Old 10-31-2013, 02:16 PM  
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Eddie; Welcome to the site, not sure why a hot water line would sweat. Cold lines sweat because the water cools the pipe and then the pipe cools the surrounding humid air. As the air cools it deposites the water on the pipe.

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Old 11-24-2013, 08:25 PM  
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I was talking with some Insulation guys at a plant the other day. They were telling me to use rubber on cold water and fiberglass on hot water pipes. The reasons being that the hot water pipes go from hot to cold when being used or during winter, etc.. The heat change will cause the rubber to dry out and over time crack and crumble.

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Old 11-24-2013, 09:22 PM  
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I always like it when people have a good story that you can beleive until you find out they are full of it.
http://www.leaningpinesoftware.com/hot_water_pipes.shtml

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Old 11-25-2013, 03:01 PM  
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@neal, i guess what I wanted to do is the preferred method and the insulation guys were right except for, only high temp systems like steam will deteriorate the rubber but its fine for anything else. Great article, thanks!

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Old 11-25-2013, 09:11 PM  
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I found the part about hot water usage interesting.



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