You could mix them up, 4:12 shingles 2:12's being another product or you can put the same product on the 4:12's as 2:12's.
Any single ply membrane EPDM,PVC,TPO would be fine, a Self adhered modified or a torch down would be fine too, A hot asphalt would work but on a 4:12 the roofer would need to know what he is doing.
Actually on the whole thing the roofer better know what he is doing, the valleys would be an increased concern when using two different types of materials.
Any single ply membrane EPDM,PVC,TPO would be fine, a Self adhered modified or a torch down would be fine too, A hot asphalt would work but on a 4:12 the roofer would need to know what he is doing.
Actually on the whole thing the roofer better know what he is doing, the valleys would be an increased concern when using two different types of materials.