Thread: Rusting Galvanized flashing

home is 2006, what could the problem be? what should I recommend here?

Similar Threads:

• Jack flashing shingles at edges.
• Skylight flashing new construction
• Fastener type for flashing
• Roof flashing
• Chimney Flashing

Jerome,

Photos?

Where is the house located?

Near the ocean? Near the Intra-coastal? Between the two?

It is quite possible that the flashings should have been copper.

The house was out by I95 in on of those gated communities. I did not see this problem on the neighboring houses.

It is salt air or the roofers spilled something corrosive on it before the shingles where installed and wiped it off. I would just sand it, prime and paint. What was above that area anything that could cause corrosive results? Was there a brick chimney that might of got acid washed?

Jerome,

Did you lift those shingles? Looks like it is running out from underneath the shingles. That would be one of those 'not good' things.

If not running out from under the shingles, maybe the roofers scratched it all up, scratching the galvanized coating off? Or maybe it was just not properly galvanized coated to begin with.

*I* would recommend replacing it, especially on a 2 year old house.

I know ... *holy crap, Jerry, you know what that is going to cost?* ... "Frankly, my dear, I don't give a ... " what it costs - *I* think it needs to be replaced, and *I* don't want my client to have to pay to replace it in 2 years 'when they sell'.

But that's just me, I guess.

Originally Posted by Jerry Peck

*holy crap, Jerry, you know what that is going to cost?* ... "Frankly, my dear, I don't give a ... " what it costs - *I* think it needs to be replaced, and *I* don't want my client to have to pay to replace it in 2 years 'when they sell'.

Don't be so hard on yourself JP.

Could have used the wrong type of fasteners causing a galvanic reaction leading to the corrosion as well.

I doubt if it's the fasteners. Steel, galvanize, copper, stainless none of those would of done it. Usually roofing nails are used. You would nail along the leading edge not through the metal but right up against it where the head catches the outer edge.

Galvanized sheet metal is coated with zinc. Remove the zinc coating and the iron underneath will rust. In this case as evidenced by the photo the flashing could be a damaged because it appears to be a used piece.

Originally Posted by Mike Schulz

You would nail along the leading edge not through the metal but right up against it where the head catches the outer edge.

In most of Florida, due to high wind events (yeah, those thingys ) the valley metal is nailed directly through to the sheathing. If not, the first thing which one would lose would be the valley metal, and that would not be a good thing to happen.

another area of same house

The second photo also looks like the rusting is occurring under the shingles. Until that observation, I would have thought it was no big deal. However, if it is occurring under the shingles AND is not occurring on nearby homes, I suggest they get a reputable roofer to find the source. Then they may have a decision to make.

Darrel Hood
DILIGENT PROPERTY SERVICES

First thing, I'm not a big fan of the cut valley on any shingle roof, especially with laminate shingles. Any time you bend a laminate shingle things can go wrong, such as the lamination coming apart. It looks like the valley is letting water through. Does that piece of galvinized metal extend up along entire valley as underlay? The usual underlay is #30 asphaltic felt in the valley and #15 felt throughout. An open "W" profile metal (Pre-painted steel or Galvalum, 26 gauge) valley flashing.

Frank Suchodolski, High Profile Roof Care Inc.

Just plain ole cheap galvanize job on the metal. 2006 home with rust like that it has to be junk flashing. Of course it may be because the home is on a 60 by 60 rock in the middle of the Atlantic some where with the waves breaking over the roof..