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Old 03-25-2008, 01:53 PM   #16
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grace is just an epdm with glue to attach,the asphaltic ice & water shields would/could cause a problem over time

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Old 03-25-2008, 02:30 PM   #17
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to AaronB

the thing about epdm and roof cement is that epdm moves (expands/contracts) while roof cement hardens and does not move, therefore the bond between the two breaks quickly.

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grace ice and water IS asphalt based! it is not epdm. On a recent IB job we did, the sky-lights were wrapped in grace I&W and my heat welder briefly touched it. It quickly melted all over the tip of the welder and started dripping a little bit on the membrane, and then took some time to clean it off. Trust me , it is definitely asphalt based.
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Old 03-25-2008, 05:06 PM   #18
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Ice and Water Shield is a bituthane polymer asphaltic based product.

Yes, it melts from a Liester, quite easily even from the hot air flow, let alone touching the nozzle to it. It shrinks and opens up voids almost instantly.

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Old 03-26-2008, 12:41 AM   #19
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Ok, well all asphaltic products are not compatible with EPDM but do not eat the EPDM like I hear so often.

I do not think that the grace over epdm would be a compatibility issue, rather a disbondment issue, thereby offering little to no protection that would not otherwise be afforded by the EPDM.

Not all roof cements will harden. Yet all roof cements are incompatible with EPDM.

Also, a MF,FA EPDM will not likely expand and contract so much as to break a bond of roof cement at a penetration. (I would still not use it on rubber) The solvents in roof cements WILL degrade the rubber though.

Incompatible ALSO because of membrane degredation due to the solvent content. How's that?
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Old 03-26-2008, 12:48 AM   #20
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grace ice and water IS asphalt based! it is not epdm.

ok,been a looong time since I`ve bothered with grace,since it 1st came out,anyway-tend to prefer the gaf anyway,and usually use mod bit rather than the epdm,unless it`s a spec.

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