How Many Layers Of Roof Shingles Do I Need?

How Many Layers Of Roof Shingles Do I Need? House roofs should never exceed three layers of shingles. Adding additional layers without excavation can save homeowners up to $1,000 in labor. Therefore, layering has advantages. Building and city codes require roofers to limit shingle layers to two. Is 2 layers of shingles OK? As mentioned