Posted: 11/14/2015 2:52:41 PM EDT
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On my dad's house the last time it was roofed the idiots didn't install the plumbing vent lead Jacks correctly.
They never folded the top into the pipe and used caulk instead. So now the roof deck has been getting wet and starting to rot . It's not bad enough to replace though. So I need to know how far out of the roof is minimum height. A couple of the pipes are only about 4" , maybe a little less. The lead jack on those I will have to cut off some because they are too tall and I can't fold 4 " of lead down the pipe. Wondering if I need to extend the pipe though. I don't won't to tear shingles off and need the absolute minimum height I can get by with. |
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6" a 12". Consider possible snow loads which could block vent. There are also considerations for actual placement relative to the peak, etc., etc.
For fixing existing in place the above should be adequate. The are also neoprene type roof jacks (boots, sleeves, nomenclature varies by region) that may also work. You could easily Google this, I did. I don't build houses, in the commercial pm side. |
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I don't do as much with residential roofs, but on commercial roofs the general rule is flashings should be >8" high.
I would suggest extending the 4" pipes out to about a foot or so and installing a new lead boot (or whatever kind of pipe jack you prefer; I've always kind of liked the Oatey No-Calk jack). On a side note, I also despise roofers who don't fold in the top of the lead. It happens a lot and it should happen never. 
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Quoted:
12" should work Also, who in the hell still uses lead roof jacks?  House built in 72 and had them then. These are not the originals however. Was replaced when roof was done about 10 or 12 or so years ago. Only one was short , about 4 inches out the roof. I think it will be ok. No snow here . After they inspect again and they don't like it I'll tell them to FOAD. J/k I will replace that one and extend pipe up. Don't want to start prying shingles up for no reason unless it's warranted. |
