Now plug the open stud spaces photos 1 and 2 and seal the top of the cavities with reflective foil photo 3.
Seal seams around lights and vents in attic for insulation.
Seal fireplace and furnace holes.
If you have blown insulation a small rake can be helpful to level it back into place.
To apply insulation measure the circumference of the duct and use a utility knife to cut foil faced fiberglass insulation to the proper size add a couple of inches so the ends can be drawn together easily.
Use expanding foam or caulk to seal the openings around plumbing vent pipes and electrical wires.
If you are creative you can also use spray foam to glue your boxes together.
To seal these openings use caulk or spray foam.
Although the insulation is dirty it is still okay to use.
There is no need to remove and replace it.
Then use a paintbrush to apply duct mastic to the joints where an elbow connects to a duct.
For larger holes filler material may be needed.
Now it will be safe to heap insulation onto that spot.
After sealing the areas just push the insulation back into place.
Up in the attic clean the ceiling surface around each fixture slit the cover to accommodate the electrical cable and place the cover over the fixture.
You can stem the flow of air and money by air sealing your light fixtures from the inside with just a roll of painter s tape a can of spray foam insulation and a tube of painter s caulk.
You can seal large stud cavities in your attic around dropped soffits under kneewalls and around recessed lights by stuffing insulation into a garbage bag and then plugging the cavity with it.
Add or remove insulation from the bag as necessary to ensure it fits.
Use a continuous strip of foil tape to seal off all longitudinal seams along the straight runs of the duct.
If you have recessed light fixtures in your home you may also have a significant volume of conditioned air escaping into your attic.
Seal the foil to the frame with the caulk adhesive and staple or nail it in place if needed.
Soffits may be filled with insulation or covered with cardboard or fiberglass batts.
Apply the sealant around the cable and along the edge of the cover where it rests on the ceiling.
Push back the insulation and scoop it out of the soffits.
It s easy to overlook electrical wires ducts pipes and vents in the attic but the openings around these are holes can compromise the air sealing of your attic.
Cover the area with insulation again when you re done.
Apply a bead of caulk or adhesive around the opening.
Cut a 24 inch long piece from a batt of iberglass insulation and place it at the bottom of a 13 gallon plastic garbage bag.
How to air seal recessed can lights from the inside.
Notch a hole for your wire and spray foam around the bottom and any gaps in the box.
