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bendiesel 09-25-2012 02:55 PM

Flashing "Mushroom" vents?
I recently had a roofing company come to look at my chiminey flashing. In doing so, I was informed that all of my vents (mostly mushroom type), skylights, and otherwise, were not flashed correctly. I had a local handyman come and tell me the same thing.

Upon inspection, the roof has a layer below it, and the top layer was just cut around the protrusions.

I contacted the person who initially inspected my home to check it out (since his inspection report says nothing of the sort). After spending a few minutes on the roof, he said that the mushroom vents dont require it and he stands by his original inspection.

Can anyone give me a solid answer?

I can post pics later if needed.

Thanks in advance!


mae-ling 09-25-2012 04:16 PM

Please post some pics

tinner666 09-25-2012 06:01 PM


Originally Posted by mae-ling (Post 1017209)
Please post some pics


joecaption 09-25-2012 07:34 PM

Pretty common to see it done that way on a reroof.
If you do not ask for all new vents to be installed there just not going to take the time to remove what you have and just reinsall them.
One of the many reasons I refuse to do a roof over.

bcdemon 09-26-2012 07:30 AM

LMAO, how do you "flash" a box vent?
Sure the skylight and chimney need flashings, but a box vent?

The "flashing" on a box vent is known as a flange. Unless they planned on using step flashing up the sides of the vent and maybe a backpan on the topside :laughing:

joecaption 09-26-2012 07:42 AM

As you can see roof vents come with there own flashing, when you reroof there is no good way to just reflash the vent. It would need to be removed and reinstalled or replaced to do it right.

mae-ling 09-26-2012 10:59 AM

The term mushroom vent was throwing me off, never heard them referred to as that.

bendiesel 09-27-2012 05:03 PM

4 Attachment(s)
Not sure if i termed everything correctly... but here are the photos.

joecaption 09-27-2012 06:15 PM

Those look fine.

mae-ling 09-27-2012 06:21 PM

yep, looks ok

joecaption 09-27-2012 06:24 PM

If it was a new roof or one that had been stripped it would be wrong.

tinner666 09-27-2012 08:21 PM

Nope! Not good at all. Half of each vent should be on top of the shingles, Those are catching water and in less that a year will start leaking around every nail below them. Better get them fixed ASAP.

It doesn't matter whether or not the roof is one layer or 10, those are leakers.

tinner666 09-27-2012 08:24 PM

BTW, you might want to install new flashing around that Velux SL since the flashing there has been filled with nail holes. Your roofer and the handyman were correct and the inspector should have known right from wrong in this instance. Refer him to me if necessary.

mae-ling 09-28-2012 10:36 AM

That's one of the reasons I will not go over existing shingles.
They paid for them to go over existing and they did.

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