Located in Tallahassee, Florida, this  Killearn home, was roofed with Hardi-Plank shingles.

A couple of unique challenges were immediatley evident with this home. The severe pitch would be difficult to walk on a asphalt shingled roof, but when covered with 1/8 - 1/4 thick inch brittle concrete shingles it becomes impossible to access by foot. Signs of chipping/breakage were pretty evident on the roof just from limbs dropping, and previous ladder access so I could only imagine how much damage a person could cause 

The solution was to "rake" the substantial debris off the roof with an extension pole and then clean with a very aggressive solution (40%). 

This house needed a rain rinse to really make the final results POP!

Material wise, time wise, and process wise, I would compare this roofing material to tile, except that it is unwalkable.