Redoing pitch pocket, what to use for tar?


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Old 09-01-21, 06:39 AM
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Redoing pitch pocket, what to use for tar?

I'm going to be redoing the pitch pocket on my flat roof.



That's my image, from this thread:
Flat rubber roof pipe flashing

But I don't know what to use for the tar to fill the pocket. HD and Lowes don't seem to have it. I can probably get something at the local roofing supply, but I don't want a 5 gallon bucket of the stuff. Can I use Flex Seal, or similar?

I actually used Flex Seal to fix the leak, but I after this storm passes through I want to fully redo the pitch pocket to do it right, since the membrane seal around the pocket has lifted significantly and I want to fix the pipe too. I have everything I need except the "tar/pitch".
 
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Old 09-01-21, 12:57 PM
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I buy the compound at my hvac supply house. It comes in a gallon can. You can order from the link below. Flex seal would probably work too but may be more expensive.

Roof and flashing sealer
Same stuff at amazon
 
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Old 09-01-21, 01:58 PM
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Thanks. Yeah, Flex Seal is pretty expensive.
 
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Old 09-01-21, 03:33 PM
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Henry Pro-grade 928. Flex Seal says right on the can that its not for commercial use, which is code for "it isn't guaranteed to last".
 
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Old 09-01-21, 06:24 PM
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The Henry pro grade products are excellent but very expensive.
 
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Old 09-01-21, 06:39 PM
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It's half the price of Huber Liquid-flash.
 
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Old 09-02-21, 05:11 AM
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Local roofing supply has a one-part pourable sealer that they're getting in next week.
 
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Old 09-02-21, 11:35 AM
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Can I just use a tube of lap sealant?
 
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Old 09-02-21, 01:16 PM
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Here is the problem with using anything other than something that is specifically a pitch pocket sealant. You want something that is specifically made for this purpose, for this thickness, and is going to last the life of the roof. Not every product when extruded into a pitch pocket will cure at the thickness that you are applying it. Some self levelling products may bubble as the top starts to cure while the thicker areas underneath remain liquid. This can lead to bubbles (holes) that can lead to leaks. And not every product is meant to be used on a roof, with UV exposure and high temps.
 
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Old 09-02-21, 02:20 PM
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Okay. I ordered the product suggested above. Thanks.
 
 

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