Similar to the drip edge used on a house. The water tends to drip off the bend rather then keeping on migrating up the pushrod.
https://courses.cit.cornell.edu/arch...11b-roof01.jpg The water would actually migrate back up and under the shingles if not for the bend in the part of the extrusion that goes down. The bend causes the water surface tension to break and the water drips down.
Yes... water will defy gravity due to the effect of surface tension.
https://courses.cit.cornell.edu/arch...11b-roof01.jpg The water would actually migrate back up and under the shingles if not for the bend in the part of the extrusion that goes down. The bend causes the water surface tension to break and the water drips down.
Yes... water will defy gravity due to the effect of surface tension.





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