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Common advice is to insulate hot water radiator pipes in the basement so you're not wasting money heating the basement. However, I wonder if it's really cost effective. I have a ton of pipes zigzagging in the basement. Cheap pipe insulation only seems to come in sizes 1/2 3/4 and 1in. However most of my old pipes are in the massive 5-7in range and a couple big boys are near 9in in circumference. So I have to use quite expensive wrap that I have to imagine will cost me 2-3-400 dollars to wrap my basement up. Is it really worth it?