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Old 01-23-2011, 04:22 PM   #1
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Cold Tar, Good or bad?


I have two estimates to restore the flat roof of our Church's Edu. Bldg in SoCal.

I uses two layers of cold tar and the other uses two layers of asphalt emulsion.
Both use two layers of elastomeric roof coating.

Do either one have a advantage over the other?

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Old 01-23-2011, 05:11 PM   #2
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Cold Tar, Good or bad?


Too vague of a description.

Emulsion and mat is generally only a maintenance coating

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Old 01-24-2011, 03:01 PM   #3
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Cold Tar, Good or bad?


It's either coal tar or asphalt. Whichever you choose needs to be compatible with the existing roof. If the existing roof is asphalt then that's what you go back with. If coal tar then coal tar. The two are not interchangable. A knowledgable roofing company should know the difference. Coal tar is pretty tough to find now-a-days, since CT was found to be a cancer causer. If the roofer says "Cold Tar", then you better avoid him. Cold applied asphalt, however, is a completely different animal.
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Old 01-24-2011, 03:44 PM   #4
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Cold Tar, Good or bad?


I just talked to the roofer. It's asphalt emulsion.
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Old 01-24-2011, 04:00 PM   #5
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Cold Tar, Good or bad?


Please tell me he means emulsion and mat, then a white elastomeric coating. If so then you are getting a maintenance coating, not a new roof. Depending on the quality, count on maintenance and possible recoat every 2 or 3 years and it should last you ten+ years.
If he's just going to spread emulsion only then it's pointless and you are throwing money away.
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Old 01-26-2011, 12:33 AM   #6
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Cold Tar, Good or bad?


Asphalt is good for a while but eventually separate when it old or too hot which open spoors an eventually leak cold solution is easier to work with and little longer lasting also easy to apply and should be done a well prepared surface
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Old 01-26-2011, 12:49 AM   #7
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Cold Tar, Good or bad?


Also from my experience roof mats are more durable than asphalt emulsion or any other except for alu steel tile if put on properly
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Old 01-26-2011, 08:57 PM   #8
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Cold Tar, Good or bad?


Quote:
Originally Posted by Gates View Post
Asphalt is good for a while but eventually separate when it old or too hot which open spoors an eventually leak cold solution is easier to work with and little longer lasting also easy to apply and should be done a well prepared surface

What?? Really?? Nevermind.

I think the OP may have meant Cold coating. As far as I'm concerned you may as well spread peanut butter on your roof if you are considering cold coating. We don't even allow that stuff in our warehouse let alone use it anywhere.

Glassmat and emmulsion is a temporary solution that I wouldn't recommend either.

What type of roof is on the building now?

We need more info

I'm imagining a "roofer" recommending cold tar on a rubber roof

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