The plumbing vent pipe aluminum flashing was secured with 2 face nailed roofing nails near the lower edge of the flashing. Roofer didn’t put sealant on the nail heads so I did. The shingles are Architectural, so they are thicker than non Architecturals.
I noticed that one of the nails and the flasing have lifted a bit. I am concerned that wind driven rain will get under there and make its way down the nail shaft.
Larger shank roofing nail (do they exist?), ring/spiral shank roofing nail (do they exist?) , sheet metal screw?
Thank You.
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Your roofer likely messed up by installing nails so they're exposed - I'm not aware of any manufacturer installation instructions that recommend putting nails anywhere other than where they will be covered by shingles. FHB editorial advisor Mike Guertin did an article about four years ago on installing these kinds of flashings. He backs up the lower part of the flashing with a piece of self-adhering membrane under the boot flange, leaving it about 1/2-in. shy of the ends to allow any water that does get up there to drain out while preventing most wind-blown rain from making it under there in the first place. You could probably retrofit a similar solution by 1. using self-adhering membrane if you're able to pry the flashing up enough without bending it, though this will be difficult, or 2. a bead of roofing cement (the type that comes in a tube) applied under the bottom edge of the flange. Though the nails don't belong there, it's probably best to leave them to keep the holes they created more or less filled. You'll probably want to check them about once a year to make sure no gaps have opened around them and re-goop them if they have. The roofing contractor should do this work. Your contract with them should say they'll install all materials according to code and manufacturer instructions (following instructions is a requirement for a code-approved assembly), and in this case it appears they did not.
Thank You. This was only one of several roofer mistakes. I had used this roofer in the past and he did a fine job. This time around the roofer's son was doing the day-to-day as the roofer was semi-retired. I had a back and forth with the roofer over the mistakes and damage. I did not want him to do any more work for me.
Meant to add this link for you: https://www.finehomebuilding.com/project-guides/roofing/vent-flashing-done-right
Thank You. I just read the link article. I've also been a long time subscriber and keep all back issues.