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2 layers, strip it, can't go over it due to fire code. Also, pricing for roofing is going to get tricky due to rising costs of fuel. Right now a price without looking at your roof would be around 325-350 a square stripped and re-roofed with a 30year architectural shingle. Plywood I get around 40$ a sheet to install, that's a 5 ply fir plywood,
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