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My porch is farmhouse style (low to ground, no railing), and fairly narrow. The (metal) roof is exactly as deep as the deck. One annoyance that I have is that when it rains, the water coming off the roof's drip edge often is driven back towards the porch and splashes on the edge of the deck.

I'm planning on replacing the deck boards soon, and was considering leaving the new boards an inch or two shorter to help minimize the splashing. However, since the porch is fairly narrow as it is, it's not my favorite idea. I was wondering if anyone has any suggestions for solving my problem. One thought I had was using some sort of extended drip edge or flashing to extend the actual drip line away from the house... but what type of flashing should this be? Would it have to just be custom bent from a piece of flat flashing?

Two notes:

  1. I live in the land of heavy snows, so this needs to be a solution that can accommodate deep snow sliding off the roof (so either very rigid, or very flexible)
  2. there are several inches of fascia underneath the drip edge (~6" of or so)
  3. I would like to avoid gutters if at all possible - I have no drainage issues otherwise.
  4. I'm interested in keeping the current porch deck design as is.

    porch schematic

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I was going to suggest rainhandler as well - because I'm a civil engineer and I think it's a neat idea - but not because I've ever actually seen it used (it is not a common product). However, I would not install on my own home if heavy snows or ice were a big concern.

I believe what you're looking for is a simple drip edge, similar to your picture. Do a quick search for "drip edge" or "drip flashing" and you'll find all kinds of products (many of which are likely available at your local home improvement store). Drip edges are often installed with a gutter system, but can be installed on their own as well. A drip edge is just a strip of metal or plastic that moves water droplets a short distance away from a building and then lets them fall straight down.

As you've shown in your picture, a drip edge will usually have a 45 degree bend at the end. This bend is what makes the water droplets fall down, as it is very difficult for them to travel "back up" the backside of the bend. If your flashing were flat on the bottom I.e. a 90 degree bend, then it would not work well because water droplets could wick back to the building by traveling along the flat bottom.

One problem that I see with your picture is the placement of the flashing - there's no overlap from the metal roof to the drip edge. Drip edges are more commonly installed at the top edge (top of the fascia), often under shingles. The idea is that you want water droplets to roll off the shingles or metal, onto the drip edge, and then down to the ground. In your picture, water droplets would roll off the metal roof, down the fascia, and then (hopefully) down the drip edge. I say hopefully because most likely you'll end up with some sort of gap (however small) between your drip edge and the fascia. This little gap is where mold likes to grow and water likes to sit to rot away your fascia. Installing your drip edge at the bottom is fine, but I would then choose a product that covers the fascia too, and then goes up under the metal roof (the drip edge needs to somehow start underneath the metal roof). You want a continuous path of overlapped materials for water droplets to flow down - like how shingles always overlap the next one below.

  • Thanks for the suggestion. However, there already is a drip edge there... Standard overhang for a steel roof. I neglected to show it on the schematic because it doesn't prevent water from hitting the deck below. My idea was to use flashing to augment the drip edge, but I'm sure it would look really ugly. – aaron Jul 12 '15 at 1:46
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Look up RainHandler.com. These are non-gutter vanes that attach to the soffit, and spread water away from the edge of the roof. You can dismount them for the winter months.

  • Things that need to be dismounted before winter often end up bent under ice by the second or third winter. – Ecnerwal Jun 11 '15 at 0:43
  • Right. This is why I'm a little hesitant to go for the rainhandler product. I am able to mount it well below the roofline, but I've got about 30' of distance to cover, so it's not the cheapest investment to take a chance on. – aaron Jun 11 '15 at 12:10

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