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
801 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
693 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?

Click to reply button
Inspiration banner


Post a reply as Anonymous

Photo must be in JPG, GIF or PNG format and less than 5MB.

Reply choose button


Post new button or Login button

To test the boundaries of small-footprint living, interior designer Jessica Helgerson moved her family to a 540-square-foo... Filling an underutilized area beneath the stairs is a smart way to save space. Doing so with a stash of wood, however, is ... The Audubon Society inspired wallpaper in this Adirondack-styled mudroom will get you in the outdoor mood. Grab your coat ... Chalkboard paint opens up endless possibilities for customizing your dresser time and time again. Use chalk to label the c... A fireplace in the bathroom creates the ultimate setting for relaxation. Homeowners often choose electric or gas over wood... This roomy boot tray made from punched metal stands up to all the elements. Station it in your mudroom or at your back doo... There’s nothing like a new set of cabinet hardware to refresh a room. The possibilities are endless: Go modern, rustic, or... FLOR tiles are an affordable way to customize a carpeted floor covering for any space. Make anything from runners to wall-... Chalkboard paint features prominently in this elegant yet unpretentious headboard design. Add a new message daily to reflec... Salvaged boards in varying widths and colors make up the dramatic accent wall in this attic space. The high-gloss white of... The indecisive homeowner need not fret over choosing one (or even two) cabinet colors. The kitchen cabinets in this artist... Incorporate nature into your lighting scheme by securing a dead tree in a concrete mold and draping your pendant lamp from... Simple and striking, a couple of pieces of "lovingly used" furniture creates a special kind of charm. A weathered chair fo... First dress up your metal shelves with a coat of paint in an accent color that complements your kitchen decor. Then arrang... Dark wood shelving and a matching upholstered bench keep this closet sleek and refined. The large window brightens the sub...
Follow banner a
Newsletter icon Flipboard glossy Facebook Twitter Pinterest Youtube Rss icon