Tar paper or drip edge first.


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Old 06-23-14, 04:18 AM
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Tar paper or drip edge first.

I have been searching the web and seen it done both ways by both amateurs and pros. Wonder what the general consensus of the forum. Starting in an hour and need a clear answer. If it were up to me I would go paper first.
 
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Old 06-23-14, 04:54 AM
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Welcome to the forums!

The drip edge should go on first. If/when water gets to the roofing felt you want it to run off of the roof, not get trapped under the drip edge. It's ok to install the drip edge over the felt on the sides of the roof.
 
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Old 06-23-14, 05:56 AM
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One more vote for drip edge and then paper/felt.
 
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Old 06-23-14, 06:04 AM
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I always install felt first, all the way to the edge of the sheathing. The edge goes on top of the paper, which holds the edge of the paper down. When that's all the farther the roof gets at the end of the day it prevents the wind from catching the edges of the felt and ripping it off. Once shingled, if water blows under the shingles and onto the drip edge, when the paper is UNDER the drip edge, the water that runs off the drip edge is running onto sheathing that has a layer of protection under the edging (the felt).

If you do it the other way around, edging first, felt on top, water can run under the edge of the felt just as easily as it can run under the shingles... and if it does, when that water runs off the drip edge, it's on bare, unprotected sheathing.

Ice and water shield instructions specify the same method. Ice and water shield goes directly onto the roof sheathing, with edging on top. Some roofers may treat the bottom edge differently in hopes that they can stick the ice and water shield to the gutter apron, but most mfg's do not suggest that. Here's an example of Grace's instructions where you can see the notation about drip edge under precautions and limitations.
 
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Old 06-23-14, 06:19 AM
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If X puts the felt down first, that's good enough for me to switch.
 
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Old 06-23-14, 06:25 AM
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You'll get opinions either way. But in my book it just doesn't sit well to be able to get on a ladder, lift the felt and shingles up, and be able to look onto a bare plywood deck that is only being protected by a 3" piece of metal. Water doesn't have to blow very far to get onto bare wood. I think that's why on a new roof, most roofers will do paper first, then metal.

If you see paper on top of edging, it's usually a roof-over where they left the original metal drip edge on and went right over it with the paper. Not something I would usually do.
 
 

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