How To Insulate Around A Attic Furnace

This will stop the air from getting a free ride along the chase and heating your attic.

How to insulate around a attic furnace.

Because the simplest and cheapest way to insulate an attic is to add material to the floor. Use a paintbrush to apply duct mastic to the joints where an elbow connects to a duct. If necessary switch the wires to reduce the blower to its lowest speed. It is more costly to have your conditioned space heating cooling air running through a poorly insulated hvac system in the cold hot attic.

Unwrap the flashing from the vent pipe so you can work with it. Take 2 pieces and cut a c in both. Most often the attic is sealed by installing spray foam insulation at the roofline thus bringing the attic inside the building enclosure and turning it into conditioned space directly or indirectly. If the furnace is a fuel burning one be sure you provide air for combustion.

Cut 1 inch deep slots a few inches apart along the top side. Press a continuous strip of foil tape to all longitudinal seams along straight runs of duct. Nail them both on the attic floor so they butt up against the flue. Bend these newly cut tabs in.

Rigid foam insulation is attached to the walls with adhesive and to the. Cut a semicircular notch into one end of each sheet that is. Then use fire rated caulk to seal the gap btw the sheet metal and flue and then the sheet metal to the attic floor. Insulating the walls and ceiling in a furnace room can reduce heating costs and make the furnace more energy efficient.

Check the speed of the blower motor on the furnace. You can build a small enclosure around the furnace with rigid foam insulation then pick up the insulation on the ceiling inside the enclosure. This puts the furnace in at least semi conditioned space. Cut enough aluminum flashing from the roll to wrap around the vent pipe with an extra 6 inches to spare.

But if the floor is covered in plywood you can t stuff enough insulation beneath it to do the job sufficiently not even in warm climates. Now cut 2 inch deep slots. Plan to pull up the flooring and layer new insulation on top of the old.