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Posted by Don Young on August 9, 2006, 10:45 pm
> So around the fresh tar, where the flange meets the roof, i would put a
> metal sheet, etc, as opposed to packing/droping gravel into the tar?
> That actually sounds like a good idea, so i can see if/where any tar
> needs to be added during the annual inspection. I may just do that.
> Thanks a lot don
What I had envisioned was sort of like an umbrella, tightly clamped to the
vent pipe slightly above the roof level. Some vents actually come with
something like this. Keeping the penetration area protected from the weather
will improve the life of the sealing quite a bit.
Don Young
> Don Young wrote:
>> > Don- I am sure that is probabaly true, however, the kitchen vent is
>> > done the same way as I want to do the bathroom vent and it would be
>> > very visible from the street. I inspect the roof and add tar as
>> > necessecary every few years anyway, so I am not all that concerned
>> > about the bathroom vent expanding, etc. I will bring up the curb idea
>> > when we get a new roof, the existing roof is 16 years old and is
>> > showing only moderate wear at the corners, which I plan to address when
>> > I do the bathroom vent. Is there anything that can be done besides a
>> > curb that will be better than a simple flashing?
>> > Don Young wrote:
>> >> >
>> >> > warrenshudson@gmail.com wrote:
>> >> >> That is probabaly exactly what i will do. I like the hibatchi
>> >> >> idea,
>> >> >> though, so I can make my lunch too. Maybee i will just forget the
>> >> >> bathroom vent :) actually, would that be "trowel grade" roofing
>> >> >> cement?
>> >> >>
>> >> >>
>> >> >> Eric in North TX wrote:
>> >> >> > What I used to do when needing to deal with tar; buy a bucket at
>> >> >> > a
>> >> >> > home
>> >> >> > improvement store, set up a grill, hibachi or whatever, heat it
>> >> >> > while
>> >> >> > getting the site ready then haul it up with a rope when needed,
>> >> >> > wear
>> >> >> > gloves & appropriate safety gear. The hot tar spreads so nicely.
>> >> >
>> >> > adding this will create a future maintence headache as things expand
>> >> > and contract differently over the years. better to vent out a
>> >> > wall......
>> >> >
>> >> Any penetration of a tar and gravel roof at the roof level will
>> >> eventually
>> >> leak because of movement, even if just expansion and contraction. It
>> >> is
>> >> best
>> >> to build a curb around the penetration. The curb can be securely
>> >> fastened
>> >> to
>> >> the roof so it moves with the roof. Then the inner part of the curb
>> >> can
>> >> be
>> >> filled with a flexible sealant up several inches above the roof. A
>> >> metal
>> >> flashing can then be secured tightly to the penetrating pipe,
>> >> extending
>> >> like
>> >> a tent out over the edge of the curb to keep rainwater and sunlight
>> >> off
>> >> of
>> >> the sealant. Any roofer who does commercial flat roofs can give you
>> >> details.
>> >>
>> >> Don Young
>> >
>> Some sort of metal weathershield secured to the pipe to keep rain (and
>> especially sun) off of the sealed area would help. You might want it
>> easily
>> removeable for inspection.
>> Don Young
>
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