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Old 08-27-2009, 04:56 PM   #16
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Choosing flashing cement for flat roof


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Originally Posted by stubits View Post
Ed- Wow, thanks! Everything makes perfect sense.

1. Ok, so I shouldn't use the plumbing vent flashing I posted. That would have been too easy, right? Any reason why it isn't right for a flat roof? Where can I get a lead boot from? Never seen them at HD, so I am guessing a roof supply place? Any idea as to cost?

2. Alternatively, if the leak in the current lead boot isn't too bad, can I just repair it? Or does it need to be replaced?


3. How clean does the roof need to be for the cement to work? The top layer of my roof has granules, will they cause trouble?

Thanks!

I responded too quickly before I read the remainder of your questions.

1. Less than $30.00

2. Yes, it can be repaired with the roofing cement and fabric and roofing cement method previously described, but it would still only be a band-aide. Spend the $30.00 and replace it.

3. Scrape the granules if they are still very prominent in the surfacing or soften it "Carefully" with a small butane/propane hand held blaser or torch kit and just get it soft enough to scrape the top surface granules away.

Probably not necessary, but sometimes it needs to be done.

Ed

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Old 08-27-2009, 05:06 PM   #17
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Choosing flashing cement for flat roof


So, the only real remaining question is what is the likelihood that I screw this up and end up with water pouring into my attic during the next storm?

Seriously though, how long before I can test my work with a garden hose?
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Old 08-27-2009, 05:17 PM   #18
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Choosing flashing cement for flat roof


It will be good right away upon completion.

But, just in case, let the roofing cement cure for 48-72 hours if you plan on doing a water test.

It will work though if you follow everything we discussed and it seems as if you have a good handle on it so far.

Ed
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Old 10-19-2009, 07:17 AM   #19
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Choosing flashing cement for flat roof


Ed-

Hope you're out there! Sorry to revive this old post. I still haven't had a chance to get up on the roof, but will do so over the next couple of weeks. Work has just been too busy. The upside is that I've had some time to think it through more completely. The downside, however, is that I've come up with a couple of additional questions.

1) Do I need to be concerned about the outside temperature when I am doing this? Is there a minimum temperature?

2) Do I adhere the lead boot to the roof just as I am installing the various vents? That is to say, the same technique?

3) How do I keep the trowel clean as I am working with it? I will be installing 4 vents, 1 bathroom exhaust and 1 lead boot. I suppose it is going to take me all day, if not longer (how long do you think for a total newbie?) and I don't want the cement to dry on the trowel, especially during longer gaps, like when I am cutting the next set of holes, etc. How do the pros do it?

Thanks so much!
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Old 08-26-2010, 11:03 PM   #20
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Choosing flashing cement for flat roof


studbits i am in the dc area as well-how did your project go?

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