You can see that the very purpose of the chimney crown is to keep rain out.
Seal airspace along side of chimney in attic.
Seal with silicone caulk.
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.
The chimney crown is the cement part on top of the chimney.
I used pieces of various widths up to 6 in.
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I installed it upside down with the drop leg pointing up.
Sealing a chimney diy air tight removable seal duration.
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.
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.
This is bad advice when sealing around chimneys and vents because they have the potential to get very hot.
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2 many chimney leaks are from cracks in the chimney crown.
Then finish up by sealing the access hatch with self sticking foam weatherstrip photos 10 and 11.
It s by far the largest hole in your ceiling and it s probably costing you a fortune.
Air sealing the attic door.
This folded leg strengthens the unsupported edge and created a perfect little trough for firestop caulk.
Look for areas where the insulation is darkened.
Do not use spray foam.
Your attic door or drop down attic stairs are a major source of air leakage.
Put on work gloves.
Seal the gap between the flue and metal flashing with special high temperature caulk.
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Access the attic through a crawl space in the ceiling using a stepladder or use or the attic stairs.
Measure and cut the flashing for each side of the chimney using sheet metal cutters.
Finally prepare for adding insulation foam or.
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Blocking the air from leaking through the attic door is one of the most important things you can do.
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.
The ideal way to air seal in this situation is with a piece of sheet metal and high temperature silicone sealant.
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.
Your options for air sealing the attic door are.
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.
Insulating and air sealing an attic with spray foam long version duration.
If your hatch rests directly on the moldings like ours did add 2 1 2 in wide stops around the.
