If it is in reasonable condition and won’t interfere with the new roof, an old layer of shingles on the roofing can stay there. But, if you are going for heavier shingles or slate type of roofing system then the…
If it is in reasonable condition and won’t interfere with the new roof, an old layer of shingles on the roofing can stay there. But, if you are going for heavier shingles or slate type of roofing system then the…