Home>Discussions>EXTERIORS>Cracking vent pipe flashing - what to do?
12 posts / 0 new
Last post
SteveBr
Cracking vent pipe flashing - what to do?
SteveBr

My new roof was installed about 8 1/2 years ago. All new plywood decking and Certainteed Presidential line 50 year composition shingles. The plumbing pipe vents were flashed with Award Metals flashing that appears to be a type of galvanized metal with a rubber-like bell cap that slipped over the vent pipe. The label impressed on the metal flashing says "Award Metals" and a magnet stuck to it, so I assume it is galvanized metal of some sort. This vent pipe flashing is 12 1/2 inches wide, and I estimate about 14 inches long (the upper part is hidden under the shingles). Now, after only 8 1/2 years the rubber-like bells on the flashing are cracking and separating. I can't find any information on warranty for the flashing on Award's web site or in their product documents. Is this normal, expected behavior? Replacing the flashing would require ripping up quite a few shingles on an otherwise fine roof (there are 5 such vents and flashings on my roof). How long should such flashing last (I live in the Portland, Oregon area)? What should I do to remedy the situation?

Sorry I couldn't upload any images; every format I tried (png,gif, jpg) failed, even tho' in acceptable file sizes. Any advice on that would also be appreciated so I can upload them.

Thanks.

HoustonRemodeler
Re: Cracking vent pipe flashing - what to do?
HoustonRemodeler

I'd just install new flashing and call it a day. They are cheap and easy to install. The time you spend chasing a warranty will far outpace the time it will take to replace them.

dj1
Re: Cracking vent pipe flashing - what to do?
dj1

This type of flashing should last longer, but this is what you have to deal with. Replacing flashing is not as complicated as you think. Yes, it involves removing a few nails, but an experienced roofer can handle it fairly quickly.

BTW, it's done all the time.

A. Spruce
Re: Cracking vent pipe flashing - what to do?
A. Spruce

Another option would be to slip new rain collars over the existing flashings. I like the Oatey brand, though there are others.

dj1
Re: Cracking vent pipe flashing - what to do?
dj1

With the collar that spruce suggested you will possibly be open to future leaks. Replacing the entire flashing will be water tight (if done correctly - all nail holes must have fresh tar to cover them).

keith3267
Re: Cracking vent pipe flashing - what to do?
keith3267

Those collars work fine if the roof has sufficient pitch and you don't get extremely heavy rains. The metal flash has a cone in it where the collar attaches so unless the water gets over 1/4" deep on the roof surface, it won't leak.

If you do have a flat or shallow pitched roof, you could use the collar and some silicone caulk to seal the bottom to the flashing, but in this case, you would be better off with a professional roofer and using a higher grade flashing with urethane rubber or silicone rubber instead of latex or natural rubber.

SteveBr
Re: Cracking vent pipe flashing - what to do?
SteveBr

Thanks to all for the great information and ideas. I'm not an experienced roofer, just a tinkering homeowner. I noticed the cracking problem while I was on the roof performing one of my routine roof and gutter cleanings. Since these style flashings seem to have a limited lifespan (even here in the Portland, OR area) much shorter than my roofing material, I'd be best off with a lead type flashing, as I gather they're near permanent. However, that's impractical for me to do, and not really cost-effective for me. So I've decided to go the replacement "boot" route. If I can get another 8 1/2 years out of them, it'll only take one additional replacement before the solution outlasts me. Judging from the headroom in my attic, I'd estimate the roof slope is about 5' in 12'.

None of the retail outlets around here seem to carry any kind of boot in stock, so I'd have to order them. Best price I found was at a place ****** called hardwareandtools.com for just under $3 each plus shipping. Of course, we've got a week of rain on the way before the boots will arrive...

Thanks again.

HoustonRemodeler
Re: Cracking vent pipe flashing - what to do?
HoustonRemodeler

FWIW - round these parts, the squirrels sharpen their teeth on the lead, eating the top bits away causing leaks.

A. Spruce
Re: Cracking vent pipe flashing - what to do?
A. Spruce
SteveBr wrote:

I'd estimate the roof slope is about 5' in 12'.

If you've got a 5/12 roof, you're not doing gutter maintenance from the rooftop. 4/12 and less is comfortable enough to be on, 5/12 is not. It's just to steep, especially to be on your hands and knees cleaning out a gutter, at least for me it is.

SteveBr wrote:

None of the retail outlets around here seem to carry any kind of boot in stock, so I'd have to order them. Best price I found was at a place ****** called hardwareandtools.com for just under $3 each plus shipping. Of course, we've got a week of rain on the way before the boots will arrive...

Any hardware store worth it's salt is going to have roof jacks (roof flashings ), Evil Orange is everywhere these days, and they've certainly got them, you'll probably have to enlist one of the lot lizards to help you find them in the store, because they won't be where they belong, but they've got them. Hint: go to the water heater aisle, that's where they'll be. I know, I know, they should be in the roofing aisle, but that makes too much sense, which is why they put them in the water heater aisle.:rolleyes: It's Evil Orange, they're not there to be helpful, they're there to separate you from your money.

SteveBr
Re: Cracking vent pipe flashing - what to do?
SteveBr
A. Spruce wrote:

If you've got a 5/12 roof, you're not doing gutter maintenance from the rooftop. 4/12 and less is comfortable enough to be on, 5/12 is not. It's just to steep, especially to be on your hands and knees cleaning out a gutter, at least for me it is.

Any hardware store worth it's salt is going to have roof jacks (roof flashings ), Evil Orange is everywhere these days, and they've certainly got them, you'll probably have to enlist one of the lot lizards to help you find them in the store, because they won't be where they belong, but they've got them. Hint: go to the water heater aisle, that's where they'll be. I know, I know, they should be in the roofing aisle, but that makes too much sense, which is why they put them in the water heater aisle.:rolleyes: It's Evil Orange, they're not there to be helpful, they're there to separate you from your money.

You are right, Spruce. I measured the roof slope to be about 19 degrees, which puts is at a 4/12 pitch. While I was up there I measured the vent pipes. I've got two that are 1 7/8" OD (just a wee bit under 1 5/8" ID) and three that are 2 3/8" OD (wee bit under 2" ID). So now I'm thoroughly confused. None of the "boots" (Oatey calls them "rain collars") matches those. There's a 2" carded collar (what's carded?) which I presume might squeeze over the larger waste pipes, and a 1 1/4" - 1 1/2" carded collar which might squeeze over the smaller pipes. But is that a good idea, to stretch the rubber like that? There's a 1 1/2" - 3" "all flash collar" that nobody carries, too. Pictures on Oatey's web site don't seem to indicate what the differences are between "all flash" and "carded".

I tried to find Evil Orange by phoning the local Ace Hardware, Home Depot and Lowes (where nobody was home). Nobody around here ever heard of them. I even had them look in the water heater aisle. A web search for Evil Orange, Evil+roof, and Orange+roof came up with some strange results but nothing related to the collars.

The roofing company that installed the roof never called back with an estimate on replacing the flashings. Guess it's too small a job for them. Looks like I'll have to replace the flashings myself, if I can find out what sizes to get.

I'd like to look into the lead type collar since I don't want to do this again. If the squirrels chew on the lead then we may have some interesting antics to watch around here with neurologically damaged squirrels. At the moment they seem content throwing pine cones at the roof from the nearby scotch pine. Can you recommend a brand of lead collar I could look into?

Thanks for all your help and advice.

HoustonRemodeler
Re: Cracking vent pipe flashing - what to do?
HoustonRemodeler

Pages

Sponsored Stories

TV Listings

Find TV listings for This Old House and Ask This Old House in your area.