Insulate Return Ducts In Attic

Add additional sealant if necessary.

Insulate return ducts in attic.

First seal the duct seams with mastic. Hvac ductwork is typically visible in your attic especially flexible ductwork. Some insulation types offer high promises but fail to consistently perform in the field. Make sure that the rigid foam is secure.

Covering ductwork with insulation. That has kept the ventilator working but ted surmises the high. R 8 duct insulation 5 227 btu hour. If you want to install cut and cobble insulation on your attic ducts.

Is it ok to do it. Or applying spray foam insulation to the outside of the duct. If you need help deciding which type of insulation you need set up an energy consultation. Be careful as you choose from the various insulation options.

The two most common ways to insulate ductwork are wrapping the duct in a foil faced blanket. According to rightsuite the software we use the supply ducts have about 560 square feet of surface area and the return ducts 101 square feet. Looking at the cooling side only the additional load would be. Purchase duct wrap insulation that complies with the 2009 international energy conservation code iecc standards that specify an r value of 8 for attic ducts and 6 for ducts located anywhere else.

Insulating a leaky or undersized duct system is a waste of money. Summer hasn t even arrived he notes in a post at gba s q a forum and when the temperature outside climbs to more than 95 f the temperature in the attic tops 120 f. If using this technique in a humid or marine climate the ducts must be encapsulated with spray foam before installing the blown insulation. I would use foil faced polyiso which is the easiest type of foam to tape and tape it securely 3.

Install loose fill insulation to cover the ducts and the attic floor to meet or exceed the code required r value for attic insulation. Come up with a plan for insulating the underside of the ducts. As you consider adding insulation first be sure the duct system is delivering proper airflow. Today s flexible ductwork is covered with a shiny metallic cover this is its vapor barrier.