I found out the best and most inexpensive way to insulate pipes
few years ago, trouble is , I kept buying all the insulation every summer from Walmart and K-Mart the price is more than double now, take a look at how well these swimming pool noodles work, they kept the standing water in one of my
vacant properties from freezing in 3 degrees weather after power outage for 5 days !http://home.comcast.net/~georgieporgie/ ... te1089.JPGhttp://home.comcast.net/~georgieporgie/ ... te1090.JPG
As of now there are two or three ID sizes, one of them fits perfectly over 1/2 pipe, and the Jumbo size fits loosely over 3/4 inch pipe.
For the little amount of money you spend on these, it's worth it, I have no clue what the R value is, but hey , they work !