Metal Roof on house

I have a guy that has a house that has 2 layers of shingles on it. The house is solid, nice home. No valleys, no hips...just a straight gable with ridge. It does have 2 solar units.

Any suggestions on best brand of metal for a house application?

This house is about 2500 Square and he had an estimate of $22,000 and thought that was high...I wasnt sure :silly:

Thanks! Randy>>>