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Old 03-04-2010, 02:13 PM   #1
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How to Insulate behind Wall Stack Supply Duct


I am finishing my basement and in my area it is building code to continue the supply ducts from the ceiling down a wall. I am in the process of planning this and i have the angle boot, and rectangular stack ... but the distance between the concrete and my walls is about 4". I need to insulate behind the stack and i need at least a R14 rating ... What are the pros doing to insulate ?

FYI I am in Ontario Canada and the builders here insulate to the frost line with Pink Batt Insulation (4ft) ... I am going to be insulation the rest with Roxul ....

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Old 03-04-2010, 03:09 PM   #2
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How to Insulate behind Wall Stack Supply Duct


2" rigid foam = R10...use 2 layers

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Old 03-04-2010, 04:02 PM   #3
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How to Insulate behind Wall Stack Supply Duct


Couldn't you use Roxul for that too?

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Old 03-04-2010, 08:01 PM   #4
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How to Insulate behind Wall Stack Supply Duct


Quote:
Originally Posted by whirly View Post
in my area it is building code to continue the supply ducts from the ceiling down a wall.
Interesting.
Where in Ontario are you?
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Old 03-08-2010, 10:18 AM   #5
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How to Insulate behind Wall Stack Supply Duct


In London Ontario ....
I considered the rigid foam but doubling up on 2" foam plus the actual stack wont allow me the space .... Maybe i should have studded with 2x6 ...

I may have to live with the single R10 (2" foam board) behind the stack ....

It might do ...
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Old 03-08-2010, 05:47 PM   #6
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How to Insulate behind Wall Stack Supply Duct


Also wrap the duct with double bubble.

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