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Below are some renders of an unfinished structure I've made to protect a stack of wood next to an existing shed.

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It's made of a very simple frame with a pin-and-hole fastening setup at the ends that attaches to the existing shed's support structure. The cube is just a representation of the shed, but the two dangling pieces (just touching the shed) are actual cutaways of the support structure of the shed that the frame is being fastened to.

I intend on covering the frame in sail fabric, but then I'm not sure how to transition the asphalt roof of the shed to sail fabric so that the rain going down the slope of the shed's roof doesn't fall off before it gets to the canvas roof. Looking for ideas.

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    Is your drawing accurate as to the elevation relationship between the asphalt shed roof and the "lean-to" roof? If so... good luck; you need the lean-to roof below the shed roof.
    – Jimmy Fix-it
    Aug 23, 2017 at 2:55
  • @JimmyFix-it, the hinge has two parts (see second image): (1) The left-of-the-axle side is the canvas roof. (2) The right-of-the-axle side is the shed. Notice how the shed piece is above the canvas frame. The right-of-the-axle side is part of the shed. It's connected. I only showed part of it as nothing else matters.
    – user74623
    Aug 23, 2017 at 3:29
  • All angles and lengths respect reality.
    – user74623
    Aug 23, 2017 at 3:41

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The following is similar to a membrain that I did on my current home transition it has been dry for 3 winters so far. Run the sail material to the roofing with several inches to spare, use some 6" rolled metal flashing so this is 1 price. Put a layer of blackjack on 1 side of the flashing along the edge that will be the high side or not in contact with the sail 1 inch wide add a 1" stripe down the center. Place the flashing on the edge of the sail material so the material is only 3" or to the center of the flashing sealed by the blackjack. using roofing nails pin 1 end down in the center of the flashing into the sail. go to the other end and pull the sail material tight and tack just the sail down. Now go back and start tacking the leading edge of the flashing down every 6-10 inches. And the center about every 24". Once nailed down cover all the nail heads with blackjack. And make sure the blackjack pushed out and there are no voids if there is a void fill it. I used blackjack because I had several gallons but there are many different brands that will work. If totally flat there will be a small area where water tends to pool about the thickness of the material at worst case the rest flows to the side. If your roof has a pitch less water will pool. This is on a garage to barn transition so it is not a living space.

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  • This is good. I already have some large metal flashing sheets and I do have metal shears. Do you have to heat up the blackjack?
    – user74623
    Aug 23, 2017 at 15:41
  • It is a cold process and can be used when wet. I mentioned that because I had some and it worked. The membrain mfg said to use there brand and I don't even remember what that was.
    – Ed Beal
    Aug 23, 2017 at 15:46
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Cover the shed as well as the lean-to. Get a piece of sail cloth big enough to cover the shed, as well as the lean-to. Rain hit cloth, rain hit ground. Shed dry, wood dry.

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