DWV Condensation

[Tinmaniii]

Hi all,
I have an older house I just bought.
All plumbing is copper including DWV.
I have one stack in particular ( DWV ) which is 2" copper.
It goes from first floor,through second floor (picks up another waste line) and throught the attic to vent out the roof.
It of course runs through a chase, but in some areas it is open to a confined space (underneath the stairs from 1st to 2nd floor).
My question is:
should it be insulated to avoid condensation.
My initial suspicion would be a "no" to the question unless it was under a constant drainage situation, which would change copper temprature significantly if draining for extended periods of time. It is not, it serves only 2 sinks and a shower.
Am I right? or should I insulate it?

Thanks to all who answer.
cheers,
Tin

[Redwood]

No you should not need to insulate it. The only time it could concievably have a condensation issue is if there was a constant flow of cold water going down it and this would most likely be cured by replacing a leaking toilet flapper. Of course, a toilet would not be on a 2" line...

[jimbo]

The water from the sinks and shower is warmish. Even the first flush from a toilet is water which has aclimated to more or less room temp in the tank. SO, I would not expect condensation to be a problem.

[Tinmaniii]

So, 2 responses, both in agreement, good.
I probably wouldn't have thought twice about it except, when I demo'd the walls to re-do the bathroom, I found the 2" copper line covered with a fibrous burlap like covering approx 1/4" to 3/8" thick (disintegrating). It's an old house early 1950's in B.C. Canada.
Maybe I'll wrap it anyway.

thanks for responding.

[jimbo]

You do have somewhat more extreme climates than we have here in S. Calif. so a little insulation can't hurt!

[jadnashua]

Insulation might soften the sound of water draining, but other than that, shouldn't be needed.