Q: Is leaving an old roof under a new one beneficial or a way for a contractor to cut costs?

Having a contractor do a remodel/new construction (lengthening & widening existing structure) that requires a new roof (higher ridge, steeper slope). At this stage the contractor is leaving old roof under the new one (currently constructing). When I asked about it he said it adds insulation properties. It sounds like a crock and a way for them to cut costs by not removing.

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