Just wanna ask how durable is the Asphalt Shingle Roofing compare to Galvanized Metal Roof?
it depends on the product, asphalt shingels vary from 15 yr up to 40 year.
where as some metal roofing products can be from 25 yrs up to 100
Also depends on the substrate and how the roofs are maintained. Got hail in your area?
your compairing apples to oranges.....
Metal lasts longer, costs more, can be a cool roof, depending on slope can be a pain when snow slides off,can be made to look like asphalt with granules added to the surface.
asphalt, life shorter so more waste to landfill over time, easier to install.