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Widespread shortages of natural gas and crude oil following Katrina caused a 20 to 50 percent spike in the price of PVC piping, roofing and insulation, which is expected to remain near those levels in 2006. The cost of plywood, drywall, steel and concrete are also expected to remain 20 percent higher than pre-Katrina. Brick, glass, gypsum and wood will be 5 to 10 percent higher than before.
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