Installing Chimney Flashing (page 2 of 2)

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Step by Step

1. Pry, chisel and scrape off old metal flashings and roofing cement.

2. Cut a piece of prebent base flashing to fit across the front of the chimney. Cut a 45-degree angle to bend around one side.

3. Snug this bent end against one side of the chimney front. Mark the edge of the chimney on the opposite end and snip and bend this end. Pound four evenly spaced 1-in. galvanized roofing nails through the front edge of the flashing to hold it in place.

4. Snip and bend a piece of prebent 8-in. square step flashing to fit 1-1/2 in. around the front corner as shown. Apply a jelly bean–size dollop of caulk at the corner where the chimney meets the roof. Embed the corner step flashing in the caulk and nail it to the roof with two roofing nails.

5. Nail the next shingle over the first step flashing. Then nail another step flashing over this shingle. Continue until you get to the top corner of the chimney. Cut and bend the last step flashing around the top.

Click image to enlarge.
6. Slide the prebent and soldered chimney saddle into place behind the chimney. Nail it to the roof along the top edge. Space 1-in. galvanized roofing nails about every 6 in. along the edges or closer if necessary to flatten the metal.

7. Saw 1-in. deep grooves in the mortar joints to accept the L-shaped cap flashing. See Figure A for help in locating the grooves. Use a dry-cut diamond blade mounted in a grinder or a circular saw. Wear goggles, hearing protection and a good two-strap dust mask.

8. Cut the front cap flashing 8 in. longer than the width of the chimney, then bend it around the front corners of the chimney.

9. Drive the flange on the cap flashing into the groove in the mortar joint. Use a block of wood to keep from denting the flashing.

10. Drill a 3/16-in. x 1-1/2 in. deep hole through the metal and into the bricks on each corner of the chimney. Then press the expanding plastic anchors into the holes and pound in the protruding nail to expand the anchor and secure the flashing.

11. Cut the side cap flashing to fit the angle of the roof so it overlaps each lower cap flashing at least 2 in. Pound the flashing into the grooves and fasten with the drive-in expanding anchors. Bend a piece of cap flashing to fit around the top corner of the chimney and add the cap flashing across the back of the chimney.