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MP_777 01-31-2011 05:00 PM

Dryer vent insulation
I want to insulate my dryer vent to prevent condensation in the winter. The vent is rigid sheet metal and runs thru an unheated garage attic. I tried the foil duct insulation with the foil on the outside. This did not work. The fiberglass was all wet and the sheathing was wet. I also tried to use unfaced insulation but could not get it to stay with the duct tape. Is unface insulation the correct type to use and what should I use to hold the insulation in place?

VIPlumber 02-01-2011 10:14 AM

Your best bet is to use the foil insulation,, along with cross linked foil tape, These products are made specifically for this type of application.

I've never tried to use the unfaced insulation for this, so I don't if it works at all.

You may have to wait till spring/summer when it's warmer in your garage's attic, and therefore there's no condensation on the pipe when you install the insulation. or dry the pipe as you install.

Hope this helps.

MP_777 02-08-2011 04:49 PM

I used duct insulation which has foil on one side: I placed the fiberglass side on the duct and the foil to the outside and used the foil tape. But the fiberglass and the plywood around the dryer vent was very damp. It was mostly damp most towards the end of the duct run leading to the outside. I read on askthebuilder to use unfaced insulation but did not know what to use to keep the fiberglass in place since the foil tape did not stay on the fiberglass.

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