It s by far the largest hole in your ceiling and it s probably costing you a fortune.
Seal airspace along side of chimney in attic.
When you re done sealing your attic bypasses push the insulation back into place with an old broom handle or stick as you back out of the attic.
Air sealing the attic door.
Look for areas where the insulation is darkened.
2 many chimney leaks are from cracks in the chimney crown.
Your options for air sealing the attic door are.
It s often recommended to use spray foam insulation when sealing gaps in a building s envelope.
The bricks go up around the tile flue liners but at the top you need something to stop the rain and snow from just falling in around the tiles.
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Sealing a chimney diy air tight removable seal duration.
Do not use spray foam.
The chimney crown is the cement part on top of the chimney.
The ideal way to air seal in this situation is with a piece of sheet metal and high temperature silicone sealant.
If your hatch rests directly on the moldings like ours did add 2 1 2 in wide stops around the.
Measure and cut the flashing for each side of the chimney using sheet metal cutters.
Seal the gap between the flue and metal flashing with special high temperature caulk.
So you should certainly seal the air leaks around the chimney at this location by installing metal flashing with sealed seams around the chimney on the underside of the rafters.
This folded leg strengthens the unsupported edge and created a perfect little trough for firestop caulk.
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Put on work gloves.
As you note the chase on the attic floor is not as much of a problem because your basement and your attic are both inside of your thermal envelope.
Your attic door or drop down attic stairs are a major source of air leakage.
I used pieces of various widths up to 6 in.
Even though most of the gaps spilling warm air into your attic are buried under insulation you might be able to find evidence of them.
Then finish up by sealing the access hatch with self sticking foam weatherstrip photos 10 and 11.
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Access the attic through a crawl space in the ceiling using a stepladder or use or the attic stairs.
Seal with silicone caulk.
Finally prepare for adding insulation foam or.
Sealing an air leak around a chimney in the attic 1.
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Set up a cordless drill with a.
Once the metal is in place seal the remaining gap between the metal s edge and the chimney with a thin bead of high temperature silicone caulk.
This is bad advice when sealing around chimneys and vents because they have the potential to get very hot.
I installed it upside down with the drop leg pointing up.
In places to seal the airspace between the ceiling joists and the chimney as shown in the drawing.
