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Old 09-03-2010, 02:44 PM   #1
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roofing over existing


Can you install new insulation and tpo system over existing rubber roof that has 3 inch iso insulation

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Old 09-03-2010, 05:09 PM   #2
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roofing over existing


If code allows, yes.

Cut up the existing rubber before installing the new insulation. Or else you will have a double vapor barrier situation.

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Old 09-03-2010, 05:23 PM   #3
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roofing over existing


so glad you mentioned double-vapor barrier in your post Grumps.

We usually just cut out the field membrane and leave the seams just to make sure there are no adverse effects.
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