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I live in a twenty year old Florida condo quadplex. The upstairs ceilings are two by four trusses of a mansard roof.

I have replaced the ac, wall insulation, ducts. An IR thermometer shows huge heat gain from roof itself. I want to fir down the trusses to double the insulation to the new high r rated 2x6 insulation. Can I simply bolt 2x6s to each truss or do I need to build out the edges with strapping? Do you have an alternate idea?

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You're really better off with external solutions: some form of cool roof. Presumably your three neighbors face the same unwanted heat gain, and perhaps could be roped into a common project. Solid foil faced rigid foam is used in cases like this.

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