How To Seal Around Chimney In Attic

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.

How to seal around chimney in attic.

Install a piece of weather stripping around the access hole in the attic. This folded leg strengthens the unsupported edge and created a perfect little trough for firestop caulk. Drop the attic door over the weather. Plug open stud cavities.

Put on work gloves. The same rules apply to prefabricated metal chimneys. Sealing an air leak around a chimney in the attic 1. 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.

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. Plug the big holes first. You can see that the very purpose of the chimney crown is to keep rain out.

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. Cut a few pieces of foam board insulation the same size and screw them to the plywood with long 4 screws. The opening around a furnace or water heater flue or chimney can be a major source of warm air moving into the attic. Finally prepare for adding insulation foam or.

I installed it upside down with the drop leg pointing up. 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. Wrap insulation in plastic. Seal around furnace flues.

All you need to do is. Cut a piece of plywood to the size of your attic door. Long piece from a batt of unfaced fiberglass insulation and fold it at the bottom of a 13 gallon. Of course you ll still need to seal gaps with fireproof caulk.

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. Measure and cut the flashing for each side of the chimney using sheet metal cutters. Set up a cordless drill with a.