They all used rolled asphalt felt material commonly referred to as tar paper.
Peel and stick roof to concrete.
Ideal for use on roofs gutters skylights windows doors flashings walls foundations and many other surfaces.
Until recently all shingle roofs had the same type of underlayment.
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.
The only way to improve the quality of the underlayment was to make it thicker or add another layer.
Using peel and stick underlayment makes a better roof.
Peel and stick flashing tapes types uses applications.
Install 30 roofing paper mechanically attached to the plywood then peel and stick then 2 foam process to attach the concrete roofing tile.