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-   -   Cold Tar, Good or bad? (http://www.diychatroom.com/f9/cold-tar-good-bad-93259/)

philetus 01-23-2011 05:22 PM

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?

OldNBroken 01-23-2011 06:11 PM

Too vague of a description.

Emulsion and mat is generally only a maintenance coating

Maintenance 6 01-24-2011 04:01 PM

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.

philetus 01-24-2011 04:44 PM

I just talked to the roofer. It's asphalt emulsion.

OldNBroken 01-24-2011 05:00 PM

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.

Gates 01-26-2011 01:33 AM

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

Gates 01-26-2011 01:49 AM

Also from my experience roof mats are more durable than asphalt emulsion or any other except for alu steel tile if put on properly

Talos4 01-26-2011 09:57 PM

Quote:

Originally Posted by Gates (Post 578089)
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 :whistling2:


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