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Old 07-25-2011, 06:22 PM   #1
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Felt or not? Zip OSB


We are presently constructing an addition which includes an entirely new roof design. We decided to use the Zip roof sheathing system which supposedly does not require felt underlayment below the shingles which will most likely be a 40 yr arch. (Maybe Timberline)
Ice/Water membrane will be applied at all edges and valleys but I am looking for some opinions on whether or not we need to bother with felt. Thanks.

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Old 07-25-2011, 06:29 PM   #2
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Felt or not? Zip OSB


Not sure what all the roofing manufacturers have to say, but using Zip eliminates the need for felt. I have been trying to talk a couple of Contractors into trying it, but so far no luck.

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Old 07-25-2011, 06:31 PM   #3
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Felt or not? Zip OSB


Since the shingles aren't waterproof, but only water ressistant, I'd felt it. You could do that with shingles in the 50's-60's, even the 70's. I wouldn't try it with today's product.
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Old 07-25-2011, 06:36 PM   #4
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Felt or not? Zip OSB


I see we replied at the same time. Basically the same answer too. The shingle manufacturers say the zip system will keep the water out. If the shingles were waterproof, regular OSB would be OK by them.
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Old 07-25-2011, 07:19 PM   #5
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Felt or not? Zip OSB


Felt is time tested and cheap to boot. I’ll reserve my judgment on coated osb for another ten years or so., been burned by sales reps and marketing before. Remember LP?
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Old 07-26-2011, 06:07 AM   #6
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Felt or not? Zip OSB


Water won't go through the shingles but it will seep in through the joints
(even when dutch lapped) and up under the tabbed portion in wind driven situations.

Zip - not time tested.
Synthetic underlayment - not time tested.
Felt - time tested and proven to work.

I have tried synthetics and all I seen and read/hear about them, most are good.
I never worked with Zip yet.
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Old 07-26-2011, 06:59 AM   #7
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Felt or not? Zip OSB


Thanks guys. You reenforced what I was thinking...............felt is cheap and time tested.
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Old 07-26-2011, 12:42 PM   #8
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Felt or not? Zip OSB


Why did you decide to use Zip if you were going to felt it anyway?
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Old 07-26-2011, 08:24 PM   #9
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Felt or not? Zip OSB


We are building in a coastal area. Wanted T&G edges and some additional water repelling qualities.

Off the beaten track...............looking for a decent but not overpriced vinyl deck rail system. Any help here would be appreciated. Thanks.
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Old 07-28-2011, 11:32 AM   #10
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Felt or not? Zip OSB


The only job we've done over zip, we installed felt. I'm not going to rely on unproven new technology and besides osb sucks anyways.
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Old 07-30-2011, 07:34 AM   #11
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Felt or not? Zip OSB


these panels are more plastic than wood,but just relying on the sealing power of the seam tape instead of shingled felt seems counter-intuitive

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