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Old 12-11-2010, 07:37 AM   #1
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Insulating an Octopus


We now have 2 types of ducts in the crawl space. Sheet metal plenum and box with flex-duct coming out all over. I need to insulate the sheet metal parts and am wondering what the cheapest/best way to do so would be? Foam sheets with the edges 'glued' with GSFoam? Wrapped batts? Any other ways?

Thanks Guys!

DM

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Old 12-11-2010, 07:43 AM   #2
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Insulating an Octopus


Must be heat resistant/fire rated. Foam can give off toxic fumes if overheated or in a fire and doubt if it is legal to use for that reason. They want closed cell foam in crawl spaces for external walls etc here to meet code. If it does not meet the bldg code you may have a hard time selling the house if it gets inspected later. I would use the foil backed wrap from HDepot and large washers and self tapping screws to hold it on.

Your local sheet metal shop may have those self adhesive hangers and they are the best to use. Has a washer to slide on the pin which has barbs on in.
http://www.durodynecanada.ca/canada/..._fast_menu.htm

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Old 12-11-2010, 08:18 AM   #3
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Insulating an Octopus


I enclosed and insulated the crawl space walls already. But I'm sure there's still some heat loss.
All my work has been inspected and has passed, so no worries there. I'm just baffled as to the best way to insulate the exposed steel.

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Old 12-11-2010, 09:37 AM   #4
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Insulating an Octopus


Foil backed duct wrap and lots of tape. I'd use inch and a half insulation with a pound and a half density if the duct doesn't already have a liner in it.
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Old 12-11-2010, 09:40 AM   #5
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Insulating an Octopus


I wonder what THAT's going to cost us.... lol
*sigh* It never ends, does it?

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Old 12-11-2010, 10:11 AM   #6
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Insulating an Octopus


Hi DM,

I see that you have enclosed your crawlspace. Could you PM me about how you did it or post here:

Crawlspace Wall Insulation

Thanks.
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Old 12-11-2010, 10:18 AM   #7
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Insulating an Octopus


6"x6" framing, " ground contact plywood 2' up outside, same thing 12" inside. I put sheet foam in first and then added 6" batt. Then I used some particle board to finish sealing it up. I went around later and GS Foamed anywhere I felt a draft or saw any light coming through.

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