How To Insulate Duct In Attic

This could and should have been done in the first place but now you have another chance to make it right.

How to insulate duct in attic.

The duct work is the backbone of air exchange and ventilation. Install loose fill insulation to cover the ducts and the attic floor to meet or exceed the code required r value for attic insulation. Wrap the insulation around the duct allowing the beginning edge to ride up slightly over the previous piece. Insulation itself keeps warm air in and prevents cold air from infiltrating.

Press a continuous strip of foil tape to all longitudinal seams along straight runs of duct. The next best option is to encapsulate the ducts. Energy saver dealers 204 202 views. If using this technique in a humid or marine climate the ducts must be encapsulated with spray foam before installing the blown insulation.

Bury the ducts deeply in insulation. When insulating hvac ductwork use a foil faced fiberglass insulation with an r 6 or higher r value. If necessary switch the wires to reduce the blower to its lowest. Measure and cut your duct insulation a little large to allow overlap at every seam both lengthwise and on the ends.

Inspect the span of ductwork to be insulated. See recommendations for accomplishing this at the building america solution center. 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. Check the speed of the blower motor on the furnace.

Insulate and air seal to pull the attic inside the building. Use the type of metallic foil duct tape recommended by the insulation manufacturer to seal and hold the insulation in place. Look for signs of air leaks at seams or joints such as streams of dust. Sure up leaky duct joints.

How to insulate your central air heating ducts 1. Make sure the foil surface of the insulation is free of dust before applying the tape. How to insulate your attic duct system step by step with video instructions assess current state of attic insulation. Purchase duct wrap insulation that complies with the 2009 international energy conservation code iecc standards.

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