The advantage of re-layering asphalt shingles is that less amount of time is required for applying one layer over the other.
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What are the basic steps of a roof replacement? 
The advantage of re-layering asphalt shingles is that less amount of time is required for applying one layer over the other.
The advantage of re-layering asphalt shingles is that less amount of time is required for applying one layer over the other.