I have a kid's club house built over a shed part of it exposed as a balcony with flat floor no roof over it . The old floor was an OSB flooring badly damaged with water, so I replaced it with a new one(pic attached). But I am not sure how to waterproof it and looking for some advice. I am not looking for a state of the art solution, but a simple basic way (read economical) which works. To summarize

  1. Do I need a waterproof tarp or membrane and then a pressure treated plywood over it ? Or is there another way to waterproof it? Someone suggested putting a concrete sheet and then add outdoor tiles (similar to what is done in bathroom), but not sure.
  2. Is there an easy way to create a slight slope without removing the OSB? enter image description here
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    “A slight slope” - you could have done that with tapered planks on the supports before laying the new floor. A 1/4” from house to edge would have helped. May be worth lufting the floor and doing it now before you continue. Some drain holes or gap as well.
    – Solar Mike
    Feb 10 '21 at 4:33
  • If you raise a slope you'll have an issue at and with the door; it appears to swing outwards. Also, consider the siding; done properly you would have a flashing under the siding and overlapping the sloped floor... Feb 10 '21 at 6:11
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    @JimmyFix-it so instead of "raising a slope" as you put it lower the other end... use a tool called a planer.
    – Solar Mike
    Feb 10 '21 at 9:18
  • @SolarMike Yup, but OP qualified that it must be "easy"... Practically nothing is ever easy... sigh Feb 10 '21 at 21:53
  • @SolarMike Thanks for suggestions and I may try to use the planer to do something as you suggested. But my main concern about waterproofing still remains. Any advice there?
    – cybnitc
    Feb 10 '21 at 22:28

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