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enter image description hereI have a 30 x 15 stick built shed with composition shingles over 1/2" sheathing. I would like to take 12 lineal feet off the end, remove the roofing and sheathing and install corrugated plastic to turn it into a greenhouse. How do I make that joint between the remaining composition roof and the corrugated plastic weatherproof?

Thanks

This is what I'm going to try. Any comments would be appreciated.

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I'd think you'd abut the two roofing types and overlay a flashing, lapping onto each 6 inches or more. The outcome would be similar to any hip or ridge.

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Plastic does not last more than a couple years. I have used about 3 types on my shed roof all failed. I "bit the bullet" and put in 1/4 plate glass , 2 X 4 ft. panels. They have survived a hail storm which damaged our composition roof so badly that the insurance company replaced it.

  • However wise the advice, this doesn't answer the question. – isherwood Feb 21 '18 at 14:43
  • @isherwood I disagree. The OP said, “Any comments would be appreciated.” They didn’t say, “Only comment on my method.” Actually, blacksmith 37 has given advice on longevity...very worthwhile. – Lee Sam Jun 6 '18 at 0:59

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