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Despite its advantages, reroofing is not without its drawbacks. One of the foremost considerations is local building codes. Many jurisdictions allow homeowners to place a new layer of shingles atop existing ones, but there may be limitations. Some areas only permit a single overlay, and if your roof has previously been reroofed, you may be required to remove the old shingles before installing new ones. Always check with local authorities before beginning the project to ensure compliance.
reroof over existing asphalt shingles

One of the critical functions of roofing mineral granules is to protect asphalt shingles from the harmful effects of ultraviolet (UV) rays
. The sun's rays can degrade the underlying asphalt material over time, leading to fading, brittleness, and eventual failure of the roofing system. By covering the surface of the shingles with mineral granules, manufacturers provide a barrier that reflects UV light and extends the lifespan of the roof.