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Old 11-29-2011, 01:25 PM   #1
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I had my roof re-shingled a couple of years ago. Great job, no complaints. I noticed during a recent rain that at one point along the dripline the water flowing off the shingle lip actually curls around back underneath to run down the facia board. This seems odd since there is a good 3/4" of shingle overhang on a pitched roof.

I am thinking there may be some kind of hydrophobic product I could paint on underneath the lip to prevent that.

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Old 11-29-2011, 05:00 PM   #2
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This is why they install metal drip edge.

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Old 11-29-2011, 07:22 PM   #3
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+1

Water has a given surface tension and this tendency for water to actually flow uphill is what a drip edge/apron is designed negate.

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Old 11-29-2011, 07:59 PM   #4
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Do you live in an alternate universe where water defies gravity?
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Old 11-29-2011, 08:18 PM   #5
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Quote:
Originally Posted by packer_rich View Post
Do you live in an alternate universe where water defies gravity?
I wish.

For the original poster, the water does not actually defy gravity by itself but it can go toward the fascia board via capillary action and the high polarity of water draws molecules to another molecule.

Ever seen a bug run across a lake...surface tension.

Hence the way that water can creep up a surface and the same concept that reverse curl gutter caps are based around.
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Old 11-30-2011, 06:55 AM   #6
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I don't see where the poster said there was no drip edge.

Even with drip edge/gutter apron properly installed the water can and will still travel back to the facia, now if it finds a way behind the facia then there's a problem.

If you have gutters they should catch that water, if you don't than you should keep your facia painted, sealed or wrapped properly in aluminum, depending on the type you have.

You don't want to paint the portion of the shingle you see hanging over the edge (surface or underneath) because that will eventually cause other issues.
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Old 11-30-2011, 11:14 AM   #7
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The upper edge of the facia board has aluminum drip edge/protection covering the edge and hanging down maybe 2" with a slight flair out from the face of the facia. The shingle overhangs this about 1", and is the only real drip edge. A gutter would not change the wicking action of the rain unless it were sealed to the underside of the shingle or tucked underneath the aluminum.

This wicking only happens at one spot where there is a steady stream of water. I suppose I could place additional aluminum to extend the drip edge slightly at that spot, or just live with it. It will eventually stain the facia.

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