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

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Old 11-27-15, 07:48 AM
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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.
 
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Old 11-27-15, 08:24 AM
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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.

Bud
 
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Old 11-27-15, 04:30 PM
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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.
 
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Old 12-14-15, 03:39 AM
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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.
 
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Old 12-14-15, 06:52 AM
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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.
 
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