HotCoals said:
Maybe I'm wrong..but I think he just cut the hole right through the shingles..never removed any shingles.
I guess you could?
When I do this, I drill up from the bottom after locating where the
center of the plumb venting is going to be with a LONG 3/8 diameter
bit & leave the bit thru the roof. Then I get up there & plumb the drill
bit with a magnetic torpedo level. I locate the top of the flashing cone
to be centered on the plumbed drill bit. I use a yellow crayon type marker
to trace the ellipse on the shingles at the bottom of the cone, & I mark the
4 corners of the flashing plate for reference. With a sawzall, I then cut ONE
INCH outside of the crayon marking to give me a little "fudge" room, around
the top of the ellipse, from 9 O'Clock to 3 O'Clock. From 9 & from 3, DOWN,
I cut straight to a horizontal cut ONE INCH below the ellipse.
I use the corner markings to determine what roofing nails I have to remove, &
use a flat bar to remove them. Then I slide the flashing up under the shingles
leaving as little of the bottom plate out as I can...I use roofing nails across the
bottom (cuz I'm anal that way) & silicone all the way around the flashing & under
the shingles where the cut ends are...
Hope THAT makes sense...