I am purchasing a home that has 3 low sloped metal roofs. One over the front porch, one over the back, and one over an addition. The addition and the back porch are leaking and i would like to replace all three of them. The slope is probably 3or4:12.

Any websites or advice would be greatly appreciated.

I have done traditional shingle roofing in the past, but was under the impression that this slope was too low for it.