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