Seal Airspace Along Side Of Chimney In Attic

I used pieces of various widths up to 6 in.

Seal airspace along side of chimney in attic. It s by far the largest hole in your ceiling and it s probably costing you a fortune. 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. 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.

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 folded leg strengthens the unsupported edge and created a perfect little trough for firestop 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. Your attic door or drop down attic stairs are a major source of air leakage.

Insulating and air sealing an attic with spray foam long version duration. Corey binford 142 407 views. Sealing a chimney diy air tight removable seal duration. Seal with silicone caulk.

Seal the gap between the flue and metal flashing with special high temperature caulk. Sealing an air leak around a chimney in the attic 1. Put on work gloves. I installed it upside down with the drop leg pointing up.

Do not use spray foam. 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. Finally prepare for adding insulation foam or. Blocking the air from leaking through the attic door is one of the most important things you can do.

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. Way more information than you ever wanted on how to fell a tree. Look for areas where the insulation is darkened.

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. World s best tree felling tutorial. 2 many chimney leaks are from cracks in the chimney crown. In places to seal the airspace between the ceiling joists and the chimney as shown in the drawing.

Your options for air sealing the attic door are. Energy saver 94 502 views. If your hatch rests directly on the moldings like ours did add 2 1 2 in wide stops around the. You can see that the very purpose of the chimney crown is to keep rain out.

Then finish up by sealing the access hatch with self sticking foam weatherstrip photos 10 and 11. This is bad advice when sealing around chimneys and vents because they have the potential to get very hot. It s often recommended to use spray foam insulation when sealing gaps in a building s envelope.