How To Insulate Around A Attic Furnace

Plan to pull up the flooring and layer new insulation on top of the old. 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. This will stop the air from getting a free ride along the chase and heating your attic.

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This puts the furnace in at least semi conditioned space.

How to insulate around a attic furnace.

Cut 1 inch deep slots a few inches apart along the top side. 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. Bend these newly cut tabs in. Now cut 2 inch deep slots.

If necessary switch the wires to reduce the blower to its lowest speed. Insulating the walls and ceiling in a furnace room can reduce heating costs and make the furnace more energy efficient. Press a continuous strip of foil tape to all longitudinal seams along straight runs of duct. Cut two flat sheets of aluminum flashing that are 14 inches long and narrow enough to fit between the ceiling joists around the flue.

Heating cooling a while back i wrote about the incompatibility of putting an atmospheric combustion furnace in a sealed attic. Unwrap the flashing from the vent pipe so you can work with it. Check the speed of the blower motor on the furnace. Cut enough aluminum flashing from the roll to wrap around the vent pipe with an extra 6 inches to spare.

Then use fire rated caulk to seal the gap btw the sheet metal and flue and then the sheet metal to the attic floor. Cut a semicircular notch into one end of each sheet that is. Nail them both on the attic floor so they butt up against the flue. Use a paintbrush to apply duct mastic to the joints where an elbow connects to a duct.

Because the simplest and cheapest way to insulate an attic is to add material to the floor. If the furnace is a fuel burning one be sure you provide air for combustion. Take 2 pieces and cut a c in both. You can build a small enclosure around the furnace with rigid foam insulation then pick up the insulation on the ceiling inside the enclosure.

It is more costly to have your conditioned space heating cooling air running through a poorly insulated hvac system in the cold hot attic. Rigid foam insulation is attached to the walls with adhesive and to the. Suggest that the hvac air handler in the attic be enclosed in a well insulated equipment room r 19 or greater and all the ductwork in the attic should be insulated to r 19 or greater not r 4 3.

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