Best Wrap for 1/2 inch heater Pipes on Exterior walls

Old 11-27-15, 06:48 AM
biketrax's Avatar
Thread Starter
Join Date: Jan 2008
Location: USA
Posts: 384
Received 3 Upvotes on 3 Posts
Best Wrap for 1/2 inch heater Pipes on Exterior walls

I am re-insulating my exterior wall with Roxul. The walls are only 3.5 deep (2x4) I would like to retain as much heat in the pipes as possible. Is the rubberized foam wraps from the big box stores the best wrap I could use? The insulating company said the Roxul should be sufficient, But I would like to be safer with an increased insulation around pipes.
Old 11-27-15, 07:24 AM
Join Date: Oct 2008
Location: New England
Posts: 9,460
Received 47 Upvotes on 43 Posts
Where are the pipes located in the wall. If they are close to the outside the insulation may prevent the warmth from inside from reaching the pipes. It's almost a linear divide. If it is 10 outside and 70 inside, then half way through the insulation it will be 40 away from inside or outside. That would give you 30 in the center. I see you are in CT, so -10 outside would yield 20 degrees. If the pipe is already closer to the outside it gets colder. If you install less insulation between the pipe and the inside, it stays warmer.

Old 11-27-15, 03:30 PM
Join Date: Mar 2010
Location: USA
Posts: 4,380
Upvotes: 0
Received 256 Upvotes on 235 Posts
Leave empty space (no insulation) between the pipe and the inside wall. Suggest a V shaped void from the pipe to the inside wall, following the pipe.

This would rule out loose fill insulation.
Old 12-14-15, 02:39 AM
Join Date: Dec 2012
Location: USA
Posts: 118
Upvotes: 0
Received 0 Upvotes on 0 Posts
If you can redo them and move off the wall. My friend had his basement redone and exactly as described happened. They covered and taped all pipes with the better thick rubber insulation and then insulated the walls/rocked etc.

Cold winter, no heat in cavity area, pipe froze and burst. We moved in 1 joist in when we replumbed it with PEX. 1/2 of his basement floor had to be ripped up and replaced from water damage.

His next project included moving 3 other pipes to prevent the same issue.
Old 12-14-15, 05:52 AM
Join Date: Jan 2011
Location: USA
Posts: 4,459
Received 125 Upvotes on 110 Posts
Have to agree, supply lines have no place in outside walls in your location.
One way around it is to build the wall out so there's more insulation behind it and use Pex not copper or CPVC.

Thread Tools
Search this Thread
Ask a Question
Question Title:
Your question will be posted in: