Foam Insulate Attic Ductwork

Use a paintbrush to apply duct mastic to the joints where an elbow connects to a duct.

Foam insulate attic ductwork.

The foam provides a vapor barrier so the ductwork won t sweat. We are neither pro spray foam nor anti spray foam. The 1 800 square foot brick ranch in climate zone 4 dates from the 1960s but the previous owner installed both a furnace and ductwork in the attic just four years ago. Installs easily and wraps around irregular ductwork areas well.

Although both the attic floor and the ductwork are insulated ted recognizes the situation isn t ideal. A lot of builders and homeowners are going with spray foam insulation because of the airtightness benefits but then the questioner mentioned that the spray foam contractor had intentionally left big holes to the outside by not sealing the gable vents. You increase the amount of usable space inside your home. Nothing unusual about that.

If you want to cover metal ductwork with blown in insulation t hese steps must be followed in this order. Foil backed self adhesive foam duct insulation. If necessary switch the wires to reduce the blower to its lowest speed. As for whether you should use spray foam we are a neutral party.

Ted also has inherited a powered attic ventilator. Cover the spray foam with fire retardant spray. Oh and when you put it in your attic spray foam insulates the attic itself. Press a continuous strip of foil tape to all longitudinal seams along straight runs of duct.

At pv we recognize that spray foam is an insulation choice that some people make for their homes. Earlier this year i got a question about a home that had spray foam insulation in the attic. Check the speed of the blower motor on the furnace. While fairly thin it works well to dampen sound and can be combined with other forms to increase the insulation rating.