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Old 09-28-2007, 10:22 AM   #1
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Cast Iron Vent Stack Flashing


I am in the process of reroofing a low slope roof with roll roofing (asphalt). There is a vent stack coming up through the roof. It is a cast iron hub and spigot pipe with the female (larger diameter end at the top. The larger diameter end is about 6 inches in OD while the pipe itself is about four inches. I cannot slip a boot over the big end. Is there any sort of split boot or flashing that I can use for this job?

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Old 09-28-2007, 12:25 PM   #2
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Cast Iron Vent Stack Flashing


Can you cut off the large section, put on a rubber boot and then put an extension on for proper height?

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Old 09-28-2007, 12:42 PM   #3
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Cast Iron Vent Stack Flashing


If this were anything but cast iron, I would use a sawzall and cut off the large diameter end and add a PVC extension. Unfortunately to cut the cast iron I would have to use that special tool. The orientation of the pipe (vertical) means the tool would have to be held in the horizontal plane so as not to cause a split in the cast iron. That wpould be quite a difficult job.
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Old 09-28-2007, 12:44 PM   #4
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Cast Iron Vent Stack Flashing


Hand grinder.
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Old 09-28-2007, 06:45 PM   #5
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Cast Iron Vent Stack Flashing


MH; you can still sawzall it just have a couple of spare blades.
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Old 09-29-2007, 05:09 PM   #6
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Cast Iron Vent Stack Flashing


Depending on which type of a roll roofing material you are speaking of, the pipe boot flashing can be made out of a composition flashing material and additionally reingforced with mesh fabric and plastic roofing cement.

Is it the cheap 90# rool roofing material?

Is it to be a built uo hot mopped or cpld process application asphalt roof?

Is it a modified bitumen APP or SBS modified bitumen rool roofing material?

Ther may be different approaches to each type of material.

Ed
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Old 10-04-2007, 09:12 AM   #7
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Cast Iron Vent Stack Flashing


They make carbide grit blades for sawzall that work pretty good on cast iron pipe - a little slow, but they last several cuts. Even better is a diamond blade in a circular saw. Another choice might be the old type lead boot - they can be be overlapped and crimped, unlike the rubber ones (I've had to do this for odd size refrigeration pipe where a pitch pocket wasn't feasible). Lead leaching is however becoming a concern for enviro reasons, so might not be legal in some areas.
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Old 10-04-2007, 01:07 PM   #8
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Cast Iron Vent Stack Flashing


There is a tool you can rent cheaply too. It is sort of like an oil filter wrench but made of a chain and somehow you surround the circumference of the pipe and it wil chop it off cleanly.

Ask any plumber that you might know or stop in one of their shops and ask if you don't know any.

Ed
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Old 10-04-2007, 08:05 PM   #9
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Cast Iron Vent Stack Flashing


Ye Ole Iron Snapper LOL. I didnt mention it cause I am afraid that he will snap it and the chunk will punch a hole in the roof
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Old 10-04-2007, 09:12 PM   #10
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Cast Iron Vent Stack Flashing


Danggggg! That little tool is expensive to buy!

Ed

Reed Snap Cutters



SC49 Ratcheting The close quarter pipe cutters are the easiest to use because the screw is captured, does not have to be manipulated into place, and takes less effort than those of the competition. American made, multiple use ratchet wrench ships with SC49 models.

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