Back in Ohio/Indiana, most roofing companies would only warrantee their work if you did a complete removal of the existing singles whether it was 1 or 2 layers. I'm guessing it's the same here. Lots of folks did their own roofs and added a second layer. Two layers was the max. back home due to weight of the shingles and potential snow fall weight. Florida building code may be different, probably depends on the roof truss design. Best to call your County that handles Building Permits and ask.
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