Ice Barrier

Old 10-30-01, 02:50 AM
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Hello, I am replacing the flat roof on my front porch and I am going to go with the 18" selvage edge roofing. My question is; it recommended that I install an ice barrier or shield under the roofing and if so how far up do I run it? This is an outside open porch and it is unheated. I live in an area where we get quite a bit of snow.

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Old 10-31-01, 02:07 PM
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Selvage edge is a sealed roofing system with each sheet bonded to the next with adhesive. Ice shield is used more for shingle applications where the roof is not sealed but merely sheds water. It wouldn't do any harm to use it but if you use the adhesive right and all nails are covered by the membrane, you shouldn't need ice shield. If the roof is flat though I would go with a modified bitumen, either torch applied or with adhesive. Selvage edge or SIS as it's called is not going to hold up to water or snow laying on it for too long.

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