Installing Vent in Tar and Gravel Roof

Posted by on August 4, 2006, 10:30 pm

I want to have an 8" metal vent installed for a bathroom master fan. I
have a tar and gravel roof, and I am wondering what the correct
procedure is for installing the vent. I talked to multiple companies
who wanted on the order of 1200.00 to do this. Those quotes seem
unreasonably high. The roof is a 2/12 pitch tar and gravel roof in the
detroit area. Anyone have any thoughts on how to install the roof
flashing and vent pipe?

Posted by tom on August 5, 2006, 1:37 am

Cut a hole, install the vent flashing, and goop/tape/goop 'n gravel the
heck out of it. Damn flat roofs... Tom
warrenshudson@gmail.com wrote:

> I want to have an 8" metal vent installed for a bathroom master fan. I
> have a tar and gravel roof, and I am wondering what the correct
> procedure is for installing the vent. I talked to multiple companies
> who wanted on the order of 1200.00 to do this. Those quotes seem
> unreasonably high. The roof is a 2/12 pitch tar and gravel roof in the
> detroit area. Anyone have any thoughts on how to install the roof
> flashing and vent pipe?

Posted by on August 5, 2006, 4:22 pm

tom wrote:

> Cut a hole, install the vent flashing, and goop/tape/goop 'n gravel the
> heck out of it. Damn flat roofs... Tom

I understand I have to cut the hole, but do I want to chip away the
gravel out of the tar first, before cutting through? Also, does the
flange on the pipe jack need to go under the tar and tar paper, or does
it merely go on top, and get liberally taped/tared/taped/tar.... ?

Also, what can I expect to find under the top layer of gravel and tar?
I assume more tar and tar paper, but will the flange "slide" under the
tar paper to the plywood, or do I need to cut back the tar to the
*outside* of the flange on the pipe jack ? the roof base I am going to
use can be seen at http://www.artiscaps.com/roofbase.html. I am going
to use the adjustable 8" one

Posted by tom on August 7, 2006, 11:52 am

The higher the flange is in relationship to the roof grade, the better
it'll shed water. So, set the jack on top of a fresh skimming of tar
and nail it down, lightly tar the flange top, tape and tar 'n gravel.
Tom
warrenshudson@gmail.com wrote:

> tom wrote:

> > Cut a hole, install the vent flashing, and goop/tape/goop 'n gravel the
> > heck out of it. Damn flat roofs... Tom

> I understand I have to cut the hole, but do I want to chip away the
> gravel out of the tar first, before cutting through? Also, does the
> flange on the pipe jack need to go under the tar and tar paper, or does
> it merely go on top, and get liberally taped/tared/taped/tar.... ?
> Also, what can I expect to find under the top layer of gravel and tar?
> I assume more tar and tar paper, but will the flange "slide" under the
> tar paper to the plywood, or do I need to cut back the tar to the
> *outside* of the flange on the pipe jack ? the roof base I am going to
> use can be seen at http://www.artiscaps.com/roofbase.html. I am going
> to use the adjustable 8" one

Posted by on August 7, 2006, 1:28 pm

Ok. So it is really not like a shingled roof at all, because in this
case, even the part of the flange closest to the peak of the roof is on
top of the actual roof surface, where on a shingled roof, that part of
the flange is below the shingle corse towards the peak of the roof.
What is the best method of getting all the gravel out of the area the
flange will sit? most of the gravel is stuck into the exisitng tar.
Also, when I get the gravel out, how do I go about leveling the roof
surface so there will be no voids for water seepage under the flange?
Just use tar? Thanks a lot/

tom wrote:

> The higher the flange is in relationship to the roof grade, the better
> it'll shed water. So, set the jack on top of a fresh skimming of tar
> and nail it down, lightly tar the flange top, tape and tar 'n gravel.
> Tom
> warrenshudson@gmail.com wrote:

> > tom wrote:

> > > Cut a hole, install the vent flashing, and goop/tape/goop 'n gravel the
> > > heck out of it. Damn flat roofs... Tom

> > I understand I have to cut the hole, but do I want to chip away the
> > gravel out of the tar first, before cutting through? Also, does the
> > flange on the pipe jack need to go under the tar and tar paper, or does
> > it merely go on top, and get liberally taped/tared/taped/tar.... ?
> > Also, what can I expect to find under the top layer of gravel and tar?
> > I assume more tar and tar paper, but will the flange "slide" under the
> > tar paper to the plywood, or do I need to cut back the tar to the
> > *outside* of the flange on the pipe jack ? the roof base I am going to
> > use can be seen at http://www.artiscaps.com/roofbase.html. I am going
> > to use the adjustable 8" one

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