Question about Roof Jacks


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Old 09-13-10, 12:14 PM
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Question about Roof Jacks

I am planning on using relatively inexpensive roof jacks from the local hardware store for my sewer vents. They have a rubber seal that you can cut to adapt to various size pipes (1.5-4 inches). I have heard that the rubber can fail over time.
Has anyone had experience with these? Are they reliable?

The more traditional jack has a large pipe and rain cap but the rubber-seal type has a much cleaner look.

Victor
 
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Old 09-13-10, 12:36 PM
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The rubber can fail over time with exposure to the elements. Mine in VA were pretty deteriorated after 16 yrs. Guess what? They make replacement rubber that slides down over the pipe and is siliconed in place over the old one. Works just fine.

http://www.plumbingsupply.com/roofflashings.html

Also...I'd use flashings that don't have that large a range (not that I've ever seen them). Most are something like 1 1/4-2, 2-3, 3-4. One slip when cutting and you won't get a good seal with a 1 1/2-4" range.
 
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Old 09-13-10, 01:23 PM
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I still like the lead ones or have the environmentalist killed those?
 
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Old 09-13-10, 01:36 PM
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Yeah....I think those are probably gone ray.

Out here almost everyone use the galvanized type and then just lay on a bunch of roof tar. That lasts about 2 years.

The bath and kitchen fan vents all had those T style jacks, which with the wind here, blew air in as often as out.

OH...VV...I would recommend using the galv flashing with the rubber seals if thats the way you want to go. The seal is easy to fix if req'd....removing the entire thing isn't. Galv will prob last much longer than the plastic ones.
 
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Old 09-13-10, 04:50 PM
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I used the roof jacks with the rubber boot slid over the PVC vent pipes on my house. They started to crack after 4 years. I painted them with roofing tar and I've not noticed any more deterioration since. I assume the tar is providing protection from UV and ozone for the rubber underneath.
 
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Old 09-13-10, 05:02 PM
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Lead boots are still available.
 
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Old 09-13-10, 10:33 PM
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I decided to get the galvanized jack with the opening sized
specifically for each pipe. Then I will use a rubber seal that slips over the pipe and jack. The nice thing is that if the
rubber seal ever fails, I can just buy a new one and slip
it on.

One problem I ran into is that I am using Presidential roofing
which installs more like shake and therefore needs a larger
roof jack. The ones with the integral rubber seals are
pretty small and were not suitable.

Thanks for everyone's advice!

Victor
 
 

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