It is possible, but not something a reliable roofing contractor would recommend. You’ll want your metal roof to have a solid structure, correct insulation, and sufficient ventilation–but it may not have these essentials when there’s a moldering roof still installed beneath it. Having the old system torn off completely before installing your new metal roof remains the best option.
HOW LONG WILL THE ROOF LAST?
The lifespan of a roof depends on several factors: Material Shingle thickness Climate and weather conditions Proper installation Traditional asphalt shingle roofs typically last
