Using peel and stick underlayment makes a better roof.
Peel and stick roof to concrete.
Go to roof online s vapor barriers page.
Until recently all shingle roofs had the same type of underlayment.
Install 30 roofing paper mechanically attached to the plywood then peel and stick then 2 foam process to attach the concrete roofing tile.
Typically ranging in width from 4 to 12 inches these peel and stick membranes greatly simplify the task of creating a continuous barrier to water entry around doors windows decks and other problem areas.
They all used rolled asphalt felt material commonly referred to as tar paper.
Installing a peel and stick vapor barrier on a concrete deck click on an image to enlarge it and then mouse over it to see the caption.
Rubber flexx waterproofing and seam tape is an easy to use peel and stick repair material to seal and fix leaks and problem areas.
Direct attachment peel stick to the plywood then use 2 foam process to attach the concrete roof tiles.