Re: Sump pump pipe sweating/condensation
The condensation/frost is from cold air entering the pipe from the outside. The insulation will protect against this condensation by preventing the warm, moist air from inside the basement contacting the cold part of the pipe.
In this case, you aren't insulating to keep the pipe cold (or the room warm), but to keep the humid air away from the cold pipe.
The "Senior Member" designation under my name doesn't mean I know a lot, it just means I talk a lot.I've been a DIYer since I was 12 (thanks, Dad!). I have read several books on various home improvement topics. I do not have any current code books I can refer to. I was an apprentice plumber for two years.