Our EPDM costs about the same as a good quality felt roof.
However you wont have to apply silver reflective paint every 5 years as you do with felt.
Firestone membranes are also
expected to last in excerss of 50 years so you could end up having to purchase multiple felt roofs for the cost of one fitted
by Hurricane Roofing.
GRP roofs can cost a fortune and are known for cracking especially in any corners.