We have two dormers (roughly 12x12 each) with a very low pitch roof (1:12, essentially flat). They've been roofed with rolled rubber for about 20 years but it's getting to be time to replace. This is in southern Michigan so all climate factors apply: heat, snow etc.
I'm considering replacing -- or just covering over -- the rubber with white metal for better heat control. (I assume there are metal roofs spec'd for low pitch.) But I'm concerned that this will make the bedrooms much noisier in the rain. How big an issue is this and would leaving the rubber in place mitigate it?
Aesthetics are not a concern because this roof is only visible from space. (-: