Chimney Flashing - Updated 22Nov10

[tackdriver56]

Some finagling is required, since the chimney is at a joint between the original house and the new addition. Not only is there a step in the roof, but the chimney flashing must include the ridge contour too.

Comments

[roxybisquaint]

Looks like a puzzle figuring all that out. Nice job.

As dogs love trucks,

[tackdriver56]

So do I love puzzles.

Rereading some of this, I realized that "base flashing" has two meanings: at the most specific, it's the first, continuous piece wrapped around the lowest edge of a chimney or dormer. "Step Flashings" are applied with each row of shingles as the roof is installed, bottom to top. (The complicated origami flashing at the uphill edge of my chimney wouldn't be needed, except for the step in the roof. I may yet replace that monstrosity with something called a "cricket" when I attack the 10-pitch in the Spring.)

"Base Flashing" also refers generally to all the chimney flashing nailed to the roof. "Counter Flashing" is what gets mortared into a groove in the masonry, and bent down to cover the open tops of the base and step flashings. Cutting that groove with a circular saw and a masonry (fragmentation?) blade will be... interesting.