Fastening plumbing vent flashings

[Joshua L. Frederick]

Should plumbing vent flashings be nailed down at bottom edge?

[Joe Funderburk, CMI]

I usually don't call it out if the flashing is laying flat like that one. "Don't be a pinhead" is my philosophy.

[Roy D. Cooke, Sr]

Originally Posted by jfunderburk

I usually don't call it out if the flashing is laying flat like that one. "Don't be a pinhead" is my philosophy.

I agree some of these flashing shrink and tear at the nails ... Roy

[Joshua L. Frederick]

95% of the ones I see usually are nailed. I'm assuming that they're nailed to avoid the potential for wind damage.

Thanks for the replies.

[KEVIN WOOD]

Joshua:

Always lightly pull up on the edge. If it moves up too easily recommend nails into the truss to prevent uplift. Sometimes they are fastened with glue. This is not a good idea but it is what it is.

[Jeffrey R. Jonas]

Joshue,
Typically with this type flashing, I dont report it, unless as Kevin stated, it is loose. Why introduce more nail holes that may eventually leak? Also, 'wiggle' the pipe itself to see if it is fastened securly. If not, it will loosen the flashing over time.

[David A. Andersen]

Yes, it should be nailed down so you get a roof leak!

It should also be sealed at the bottom so the water that gets in, can't get out and leaks into the attic.

[Joe Funderburk, CMI]

Originally Posted by dandersen

Yes, it should be nailed down so you get a roof leak!

It should also be sealed at the bottom so the water that gets in, can't get out and leaks into the attic.

And the top should be on top of the shingles, sealed with mastic.

[KEVIN WOOD]

Best You tube video on proper installation.

http://www.youtube.com/watch?v=mD-Ec...eature=related

[Roy D. Cooke, Sr]

Looks to me he used steel nails on aluminum not a good thing (http://www.finishing.com/360/71.shtml ) .
Should be aluminum nails.
A saftey harness is a good idea too .... Roy

[Pete Campbell]

Here in Port St. Lucie, FL we frequently have high wind events with wind-driven rain blowing in all directions, sideways and uphill.

Therefore, proper practice and best technique calls for placing the flashing over the pipe and directly onto a bed of roof cement on top of the felt. Then we in South Florida shingle over the entire flange up to the pipe, securing the shingles with roofing cement over the flange where a nail penetration is undesirable.

[Marcel R. Cyr]

[KEVIN WOOD]

Marcel those pictures are not correct.
Look at the install video I just put on the MB.

[Joe Funderburk, CMI]

Originally Posted by mcyr

Attachment 48109

Attachment 48110

Attachment 48111

Great photos. But you never see it done like that around here.

[Marcel R. Cyr]

Those photos came from this site;
http://www.renovation-headquarters.c...-vent-pipe.htm

And these are from the new CertainTeed Shingle Applicator's Manual