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I agree with saffle except that if you use a tub and bath surroundings adhesive and apply thin beads of the glue to the back of the tile that will adhere for quite sometime due to the moisture...

Sure

What is on the floor now? Will you be removing that material and replacing it?

Do you have a french drain around the house? Is the house built on fill ?

What I know of stucco wrap is its crap. I do not suggest using this. Use regular schedule d paper. But if you must yes you still apply wire mesh using Roofing nails. I like to overkill on any...

As for the reason it could be a # of things. You should have glued the underlayment with a subfloor adhesive. A remedy to fix some of these air pockets is take a pin and poke a hole in the area...

There are a lot of variables that go into this. How high do you plan on having this deck ? What size lumber will you be using ? What is the Width ? What is the length ?

1st thing In my suggestion from being a contractor for sometime now. I would say find a contractor who is willing to sit down with you and help design what YOU want. This will also give you a good...

I agree with sailor and apply with a heavy nap roller you may also want to buy something like a 5 mil plastic and go over your framework before applying your drywall or whatever the finish will be.

The purpose is to carry weight from above. Then in some sense distribute the weight over a larger area using beams or headers to support. Ultimately releiving the weight at the floor