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
- 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.
- Is there an easy way to create a slight slope without removing the OSB?