11:09AM | 04/12/04
Member Since: 02/29/04
14 lifetime posts
Second story additon with bathroom over garage. Drain lines are not a problem. Running supply lines are. We can run half the length of house drilling through every joist or we can run up interior garage wall to bathroom. On suggestion was to do this then box around piping and insulate the heck out of it. I live in Chicago area. My concerns are freezing pipes (can I ever insulate enough) and sweating pipes (wetting insulation.) If insualtion would work would filling box around pipes completely do the trick?

plumber Tom

06:04PM | 04/12/04
Member Since: 05/10/03
810 lifetime posts
Your on the right track garlicman. During the summer months the cold lines will sweat. A good name brand insulation for your supply lines is called Armaflex. it's inexpensive. Maybe during the winter months consider leaving a louver in the bottom of the chase so some heat can rise up inside the chase. just suggesting, good luck.


08:59AM | 04/15/04
Member Since: 11/26/02
33 lifetime posts
I just ran into the same situation with a bedroom addition. I had to run supply lines for the master bath over a mostly unheated back porch, and I was very concerned about freezing.

I used the Armaflex insulation on the pipes and made sure they were totally covered. I also followed two tips from my contractor: a) stay as close to the floor above as possible and b) poke a quarter-size hole in a nearby duct to help keep the pipes warm.

I got lucky with my setup because I have a section of flex duct running right next to the pipes, and there is insulation below (for the porch ceiling).

We went through the winter with no problems, and we had some cold days. I am also in Chicago.


07:22PM | 04/15/04
Member Since: 01/28/03
694 lifetime posts
Disagree compeletly.

In my cold region we run such pipes up into the ceiling joists then insulate the heck out of and over them.

The reason is simple: Warm air rises and as long as the pipes are kept close to the heated celing and well insulated above, it makes much more sense to run the pipes into the 'attic' of the ceiling where they can be kept warm from natural heat and insulated above to keep from freezing.


Run pipes into ceiling joists then down to appliances.

Heat rises to keep pipes warm.

Insulation above keeps pipes from freezing.

Always works.

Would think of nothing different in your circumstance.


09:13AM | 04/19/04
Member Since: 11/26/02
33 lifetime posts
Are you referring to my situation or garlicman? In my back porch I've got plenty of insulation given 2x6 floor joists, then a 4" down to another set of 2x6s for a drop ceiling. The pipes run in this space, and they are packed with insulation (above and below).

As for the warm air rising, what if there is no warm air? If the space is unheated, or it runs the risk of losing heat or not getting enough, then isn't it worse to have the pipes close to the ceiling and not the joists above?



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