The city was incorporated in 1896, and its older core neighborhoods — Little Havana, Coral Way, Allapattah, parts of Coconut Grove and Overtown — were largely built out between the 1920s and the 1950s with wood-frame and concrete-block-and-stucco bungalows. The postwar boom of the 1950s and 60s filled in more CBS ranch-style housing further out. Downtown and Brickell are a different story again: that skyline is almost entirely mid-rise and high-rise condo construction from the 1980s condo boom onward, and it's still being built today. We're not going to pretend one paragraph covers all of it — Miami's housing stock spans roughly a century and several very different building types.
On the single-family and small-multifamily side, most of what we work on is asphalt shingle over original or since-replaced wood decking, with flat, low-slope built-up or modified-bitumen sections common on additions, Florida rooms and rear extensions. The usual failure points are shingle wear and wind lift on older roofs long past a normal 20-25 year service life, flashing failures where additions tie into the original roofline, and ponding or seam failures on the flat add-on sections. High-rise condo roofs are a separate world — single-ply membrane systems maintained by the association, not a same-day residential repair call.
Permitting runs through the City of Miami, and a handful of Miami's older neighborhoods (Morningside, Spring Garden and a few others) carry local historic designation, which can add a design-review step to exterior work including roofing. Density and on-street parking in the older grid neighborhoods also just make access slower for a crew and a dumpster than it would be in a newer subdivision.