In Fort Johnson, SC, the Department of Natural Resources is facing a tough decision. leaky roof at the regional administration office needs to be replaced, and the choice is between copper and asphalt. The copper roof carries a 50 to 100 year lifespan, but at a cost of $160,000. The asphalt shingle roof is expected to cost significantly less, but is only expected to last 10 to 20 years. shingle roof is expected to cost about $60,000. “It’s either a cost-effective expenditure or it’s not. It all depends on what saves more money,” said state Sen. via postandcourier.com.