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?


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


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.


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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