How To Seal Chimney In Attic

Put on work gloves.

How to seal chimney in attic.

Some of the repellents will drip down. I used pieces of various widths up to 6 in. Now pour the water repellent sealer into the low pressure sprayer and spray it evenly all over the chimney. Remember that all chimney flashings need to be masked off prior to applying the sealer.

I installed it upside down with the drop leg pointing up. After the air sealing work was complete including wiring vent and plumbing penetrations throughout the attic the attic received an r 60 blanket of blown cellulose insulation. 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. Set up a cordless drill with a.

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. If your hatch rests directly on the moldings like ours did add 2 1 2 in wide stops around the opening. That material is not allowed to contact the masonry chimney so after blocking the bypass jerome fit pieces of 2 inch roxul mineral wool insulation around the chimney to isolate the masonry from the cellulose. Then finish up by sealing the access hatch with self sticking foam weatherstrip photos 10 and 11.

Measure and cut the flashing for each side of the chimney using sheet metal cutters. 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. Access the attic through a crawl space in the ceiling using a stepladder or use or the attic stairs.