How To Seal Around Chimney In Attic

Wrap insulation in plastic. Because the pipe gets hot building codes usually require 1 inch of clearance from metal flues 2 inches from masonry chimneys to any combustible material including insulation. The chimney crown is the cement part on top of the chimney.

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Plug the big holes first.

How to seal around chimney in attic.

Apply a thick bead of high temperature caulk the flue on one. Access the attic through a crawl space in the ceiling using a stepladder or use or the attic stairs. I used pieces of various widths up to 6 in. Seal around furnace flues.

Of course you ll still need to seal gaps with fireproof caulk. Measure and cut the flashing for each side of the chimney using sheet metal cutters. The opening around a furnace or water heater flue or chimney can be a major source of warm air moving into the attic. This folded leg strengthens the unsupported edge and created a perfect little trough for firestop caulk.

I installed it upside down with the drop leg pointing up. Plug open stud cavities. 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. Set up a cordless drill with a.

You can see that the very purpose of the chimney crown is to keep rain out. Put on work gloves. Cut a few pieces of foam board insulation the same size and screw them to the plywood with long 4 screws. 2 many chimney leaks are from cracks in the chimney crown.

Remove the insulation between the joists where the flue is located to clear an area about 18 inches away from the flue on each side. Finally prepare for adding insulation foam or. All you need to do is. Long piece from a batt of unfaced fiberglass insulation and fold it at the bottom of a 13 gallon.

The same rules apply to prefabricated metal chimneys. Cut a piece of plywood to the size of your attic door. In places to seal the airspace between the ceiling joists and the chimney as shown in the drawing. 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.

Drop the attic door over the weather. Sealing an air leak around a chimney in the attic 1. The metal and caulk method you describe is one that i typically use in attics but an alternative approach is to frame tightly around the chimney with steel studs then use solid steel channel at the top as a fire block. Install a piece of weather stripping around the access hole in the attic.

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