How To Insulate Duct In Attic

Look for signs of air leaks at seams or joints such as streams of dust.

How to insulate duct in attic.

The duct work is the backbone of air exchange and ventilation. This isn t equivalent to bringing them into the conditioned space as you ll still have additional duct load but it s a lot better than having them in unconditioned attic space. When insulating hvac ductwork use a foil faced fiberglass insulation with an r 6 or higher r value. Wrap the insulation around the duct allowing the beginning edge to ride up slightly over the previous piece.

How to insulate the attic air sealing the attic energy saving attic insulation duration. Check the speed of the blower motor on the furnace. Use a paintbrush to apply duct mastic to the joints where an elbow. Measure and cut your duct insulation a little large to allow overlap at every seam both lengthwise and on the ends.

Purchase duct wrap insulation that complies with the 2009 international energy conservation code iecc standards. The next best option is to encapsulate the ducts. Inspect the span of ductwork to be insulated. Insulation itself keeps warm air in and prevents cold air from infiltrating.

Bury the ducts deeply in insulation. If necessary switch the wires to reduce the blower to its lowest. Insulate and air seal to pull the attic inside the building. How to insulate your attic duct system step by step with video instructions assess current state of attic insulation.

That s what happened to the ducts in the lead photo of this article. Make sure the foil surface of the insulation is free of dust before applying the tape. Most attic ducts are insulated flex ducts that is flex ducts with r 6 or r 8 fiberglass insulation along with an exterior polyethylene jacket. See recommendations for accomplishing this at the building america solution center.

Install loose fill insulation to cover the ducts and the attic floor to meet or exceed the code required r value for attic insulation. If using this technique in a humid or marine climate the ducts must be encapsulated with spray foam before installing the blown insulation. Press a continuous strip of foil tape to all longitudinal seams along straight runs of duct. When these ducts are exposed to exterior air the plastic jacket never gets cold enough to permit condensation because the hot attic air keeps the plastic jacket warm.

Use the type of metallic foil duct tape recommended by the insulation manufacturer to seal and hold the insulation in place. Energy saver dealers 204 202 views.