It is very common to use the shingles as an insulator under your metal roof.  

There is also a moisture barrier that that doubles as protection from the aggregate of the shingles.  The system works well 85 percent of our jobs are done this way 

ROOF OVER SHINGLES. USE YOUR EXISTING SHINGLES, GREAT INSULATOR!!

PUT THE OLD SHINGLES TO USE AS AN INSULATOR

ULTRA LOK RIB PANEL CAN BE USED ON LOW SLOPE ROOFS DOWN TO A .05 PITCH

​T Mark

T Mark metal roofing

Roofing, Inc.

407 574 5003           CCC1328626

started in 2008

These are jobs we have done utilizing the customers Shingles as an insulator. 

80 PERCENT OF ALL OUR JOBS ARE METAL OVER EXISTING SHINGLES.  

Above:  Attaching Synthetic Felt over the existing shingles.  Once the felt is down the Panels are installed.