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It depends on the slope of the roofing system and/or decking.

Type III will not run as readily as Type II, which is better to prevent asphalt drippage down the road.

BUT, a more viscuous product has more potential for self-healing any small imperfection type pin-hole leakage gaps.

So, the right answer, between the 2 types is what is it's intended end usage?

Coal Tar Pitch would be better than any of the more viscuous asphalts, btw.

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