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Ask Machinc Your Own Question
Machinc, General Contractor
Category: Home Improvement
Satisfied Customers: 911
Experience:  Has written home improvement articles since 2008. Earned South Carolina Residential Builders License in 1991.
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So, I have a shingle roof in the inner city of Richmond VA

Customer Question

So, I have a shingle roof in the inner city of Richmond VA with a very gradual decline, say about 5 degrees. Where my furnace vent protrudes through my roof about a 8 in has been cut. 6in or so makeup the pipe. There is about an inch space around. I see that during a rain storm about a 1 drop every 2 seconds leak through the hole. It is leaking through the high point, as if water were traveling maybe underneath the tar paper or something and then finding this hole and leaking. Do you have any recommendation re. how to correct. I added about a foot of roofing tar to all sides of the pipe but that didn't seem to do anything. Appreciate any help. Andy
Submitted: 2 years ago.
Category: Home Improvement
Expert:  Machinc replied 2 years ago.
I will have your anser in a moment
Expert:  Machinc replied 2 years ago.
There is a boot that is made to go over the pipe.
You have to remove a few shingles slip it over the pipe
( it has a hole in the middle. to match your pipe size.
Replacing the shingles and placing a cap on the boot
makes it leak proof.
I will post a link so you can see what it
looks like
Expert:  Machinc replied 2 years ago.
This is just to give you an example of what im talking about.
They come in different sizes and all metal.
This one is rated for 212 degrees farenheit continuous exposure.
You need to neasure your opening and pipe to get the right size
Expert:  Machinc replied 2 years ago.
Check the temperature of your roof vent.
If it exceeds 212 degrees Fahrenheit
You will need an all metal flashing and boot

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