It's unfortunately impossible to provide a number because every project of this sort is different. Pricing as well as building code requirements vary immensely depending on geographic location. Structural support is a big question - the existing roof structure may not be able to support code-mandated roof deck loads. The best thing to do would be to contact a local architect and have him/her visit the site and discuss the project with you in more detail.
I completely agree with nC2's post. There are so many variables that need to be understood before a firm price can be given, including labor rates in your area! Here in Chicago, if the roof can support the load and access is decent, you can figure at least $40 per square foot for an Ipe deck. There are also great pedestal systems that you may want to look into. These systems will allow for easier access to the roof membrane for any maintenance issues in the future.
Starting with a qualified professional in your area is your first step.
Indeed if you're looking for a somewhat lower cost option than $40 per square foot, then 24" x 24" structural Ipe wood tiles could be a good alternative. As Toparius mentioned, these can be used with a pedestal system, but you only need to raise them a small amount off the surface and could thus use 5/8" high rubber support pads for this type of application. With a pedestal system the area needs to be bounded by a low wall so the tiles cannot move.
A structural Ipe wood tile would cost around $12 or so per square foot depending on the quantity required plus shipping cost from the supplier and the rubber support pads are only a couple of dollars each. You only need one pad per paver plus about 20% extra. If you're a handyman, you could essentially install these yourself.
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nC2 architecture llc
Topiarius, Inc
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