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The most expensive roofing material is slate. While most slate used these days is man-made, real slate is still used and is the highest price. You can expect to pay two to three times more for wood shingles than for asphalt shingles.
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Most people will replace their roof only once on twice in a lifetime. If your roof is not leaking and you do not need emergency repairs, take the time to search for a reputable roofing contractor, get bids from several contractors, check references, licenses and warranties. You will save yourself money and headaches in the long run.