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Old 09-24-2010, 07:43 PM   #1
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commercial building, flat roof leaks


Hi people,

Have a 6600sf building, flat roof, that was new in 1996. It is multi ply glass, feathered, probably 8 layers or so, with hot mopped tar when it was laid down.

Now it is about 15 yrs old, and occaisional leaks occur, I measure, scrape/sweep area well, then patch with a gallon of tar from home depot, with a 3 knot brush. Then someone told me I gotta then, after a month of the tar "drying", roll aluminum ized coating over that. Is that the right advice?

Could I get away with not applying the alum coating, as that is a pain, and seems like after 2 months, the alum cracks/alligators up and seems like its a waste of time/effort.

Thanks!!!!

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Old 09-24-2010, 08:20 PM   #2
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the aluminum is not alligating,, the asphalt is. The reason you coat asphalt with aluminum or other coatings is to prolong the life of the asphalt and delay alligating. It is a UV barrier.
You may have better luck getting a higher-quality mastic than the cheapest stuff at home depot. SBS modified mastic

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Old 09-24-2010, 09:05 PM   #3
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Is there gravel on it now?If not what coating is on existing roof?
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Old 09-25-2010, 07:05 AM   #4
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Thanks, guys. It is coated with alum coating, when they first put it on. At low sopts (pools) of course, it chips/flakes, and some overlapping glass starts to separate. I thing thats where leaks stert.

I heard about these mastic water based coatings, that they are not like good old tar. Yes, I understand tar can uv rot, thats why the alum is put on now. BUT, how can one prevent this spliting/alligating (a real word?)? Just keep on recoating alum?? Thats a pain.

Thanks!!!!!!
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Old 09-25-2010, 09:41 AM   #5
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should have an "or" in it. (alligatORing) It was a stressful day, stop bustin my balls!

You may need more drastic measures than patch and coat. Being as old as it is you may be able to get by with a cheap emulsion and mat or it may just be time for a new roof. If it is in ponding areas then they are always going to be tough to patch decently.
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Old 09-25-2010, 03:48 PM   #6
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Quote:
Originally Posted by OldNBroken View Post
stop bustin my balls!
Is "bustin" a real word?
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Old 09-25-2010, 05:11 PM   #7
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Quote:
Originally Posted by noquacks View Post
Thanks, guys. It is coated with alum coating, when they first put it on. At low sopts (pools) of course, it chips/flakes, and some overlapping glass starts to separate. I thing thats where leaks stert.

I heard about these mastic water based coatings, that they are not like good old tar. Yes, I understand tar can uv rot, thats why the alum is put on now. BUT, how can one prevent this spliting/alligating (a real word?)? Just keep on recoating alum?? Thats a pain.

Thanks!!!!!!
and since OldnBroken was nice enough not to mention how you wrote:

Quote:
spliting
for, presumably; splitting. I think oldnbroken deserves an apology.

Last edited by nap; 09-25-2010 at 05:58 PM.
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Old 09-25-2010, 05:12 PM   #8
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Quote:
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Is "bustin" a real word?
only if you include an apostrophe to indicate it being a contraction.

bustin'
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Old 09-25-2010, 05:40 PM   #9
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It's official...I hate you all!
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Old 09-26-2010, 12:56 AM   #10
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hahahha is oldnbroken a real word?




just kidding :D
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Old 09-27-2010, 03:05 PM   #11
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this is better than cats!
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Old 09-28-2010, 11:32 AM   #12
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Try reinforcing the mastic that you apply with a fiberglass mesh fabric.

Personally this is not how I would repair a hot tar roof, but it will work if done right.
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The information found in this post is not to be considered legal advice. All information should be considered relative, not specific. Never attempt any repairs you are not comfortable with. Always maintain safety! The author of this post takes no responsibility for any losses that occur. Use at your own risk.
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Old 09-30-2010, 04:45 PM   #13
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Can anyone say spam?!
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Old 10-03-2010, 07:23 PM   #14
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Quote:
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Try reinforcing the mastic that you apply with a fiberglass mesh fabric.

Personally this is not how I would repair a hot tar roof, but it will work if done right.
Thanks, Grump, for the help. But, not sure if I explained it well, its not just a hot tar roof, it has glass laminations between tar.....about dunno, 6 or 7 ??

So, would I still treat it with mesh?

Thanks!
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Old 10-06-2010, 03:26 AM   #15
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So, would I still treat it with mesh?
At least, yes. What olds chool Chicago roofers call: "Dope and midi" dope being the tar/roof cement and midi being the fiberglass mesh.

But I also suspect you might not be using the right kind of roofing cement in the first place. This may be one of the reasons why it's alligatoring. Or perhaps you are applying it too thick. Either way i'd suggest removing what's there if it has not cured/hardened, before applying something new. And when applying somethign new I'd recommend something premium like Lucas Elite Neoprene roofing cement for example. That stuff rocks.

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