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I would just use rigid foam and be done with it. Install a few screws into the rafters with a bit of head sticking out and jsut wrap some wires around it and move on to the next. Everything will stay in place. Use the wires every 6' or so. Cheap, no wrestling with falling insulation and higher R factor. Normally 3" is more then enough. Its better then what you have before in an older house. Are there ridge vents or any type of vents up on the roof now? I suggest a power vent installed near the ridge to keep air flowing. Some have a thermo-switch that can be set to go off at a certain degrees. That will get air flowing but do keep in mind that there must be enough vent to allow fresh air to flow through the attic. On those older homes, the air flow is usually pretty good. Large vents are normally found throughout unlike newer homes.
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