There are proprietary pedestal systems that provide a very stable level and serviceable deck over a roof membrane though they are relatively expensive compared to conventional methods.
How to level a roof deck.
We used a water level which is clear tubing connected to the ends of a garden hose.
When you start installing the posts for your deck you will need to make sure that each one is plumb.
In whatever manner a deck is constructed over a roof maintenance for cleaning and repairs of the membrane below is recommended.
Newer flat roofs on the other hand are often made of rubber.
To do so hold a carpenter s level securely against the post then move the post until the bubbles are centered in the two end vials.
Another tool that can be used is a plumb bob.
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Check and plumb two adjacent sides.
Use asphalt gravel or cap sheet on top of the felt if necessary and follow manufacturer instructions for the particular material.
Once it s level nail the brackets to the rim joists.
Be sure the framing is level before adding the joists.