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Old 05-20-2012, 10:36 AM   #1
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flat roof in Brooklyn


We own a floating home in Brooklyn, NY and my husband added an addition. It has an almost flat roof. He put down grace ice and water shield and was told he can put the liberty self stick base on top, followed by the cap layer. Well, the liberty base is starting to bubble and we think that the grace layer is separating the plastic-y topcoat from the sticky layer. Not sure how to progress...nail it? slice open the blisters? can't remove the grace i&ws because that is really stuck on the plywood. we are just afraid of the blisters making the roof cap not lay flat. does anyone have any help here?
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Old 05-20-2012, 10:42 AM   #2
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I've never had any SA blister on me before. Can't imagine the Grace separating, blisters are usually caused by gassing of moisture caught in the plies during installation.
Is it a lot of little blisters or a few big ones? The reason for a nailed base is so the substrate does not integrate with the system. If the moisture is coming through your substrate and the ice/water is blistering then that's a major issue. If it's between the plies it's fixable.


Last edited by OldNBroken; 05-20-2012 at 10:49 AM.
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Old 05-20-2012, 03:21 PM   #3
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Was the film on the Moisture Guard removed during installation ?
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Old 05-20-2012, 03:38 PM   #4
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Ice and water is not intend for use on a flat roof.
Should have been EPDM.
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Old 05-21-2012, 05:55 AM   #5
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we received bad advice and used the ice and water...and it really can't be removed. It is stuck on there firmly. if there was a moisture issue, what can we do? He split open one blister and it flattened down. there are quite a few and some are as big as a baseball. any suggestions would really be helpful.
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Old 05-21-2012, 09:27 AM   #6
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Again, are they between the plies or all the way to the substrate?
Are there a lot of little ones or just some big ones?
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Old 05-21-2012, 03:01 PM   #7
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How about some pix ?
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Old 05-21-2012, 06:34 PM   #8
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I am in Rochester, ny and he is down in Brooklyn so I have not seen it yet. He told me that he put the grace down and then the base . It is as if the sticky stuff on the Liberty base is pulling the Grace I & WS apart. That is as best as I can say. There are quite a few bubbles and some are as big as a softball and others as small as a golf ball.
Thank you for taking the time to answer me!

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