How To Seal Around Chimney In Attic

This folded leg strengthens the unsupported edge and created a perfect little trough for firestop caulk. 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.

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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.

How to seal around chimney in attic.

Sealing an air leak around a chimney in the attic 1. 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. 2 many chimney leaks are from cracks in the chimney crown.

I used pieces of various widths up to 6 in. Cut a piece of plywood to the size of your attic door. The chimney crown is the cement part on top of the chimney. The opening around a furnace or water heater flue or chimney can be a major source of warm air moving into the attic.

Plug open stud cavities. Put on work gloves. All you need to do is. The same rules apply to prefabricated metal chimneys.

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. Long piece from a batt of unfaced fiberglass insulation and fold it at the bottom of a 13 gallon. Cut a few pieces of foam board insulation the same size and screw them to the plywood with long 4 screws. Wrap insulation in plastic.

I installed it upside down with the drop leg pointing up. 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. Drop the attic door over the weather. Finally prepare for adding insulation foam or.

Plug the big holes first. Install a piece of weather stripping around the access hole in the attic. Access the attic through a crawl space in the ceiling using a stepladder or use or the attic stairs. Of course you ll still need to seal gaps with fireproof caulk.

Seal around furnace flues. You can see that the very purpose of the chimney crown is to keep rain out. Apply a thick bead of high temperature caulk the flue on one. Set up a cordless drill with a.

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