Re: sagging baseboard pipes?
I think the same principle applies with hot water systems; if you have a "low point" it can trap air in the high point just upstream of the low point, and it can be very difficult to get that air out of there. So you still want to see if you can support the pipes so they aren't sagging.
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.