Al Simpson, owner of Silver State Fence and Stain in Reno, started his business four years ago, using the bones of now-defunct fencing companies.The bottom already had fallen out of the residential homebuilding market, and things worsened in 2008, forcing several longtime fencing companies out of business. Simpson figured he had nowhere to go but up.And that's exactly where Silver State Fence and Stain has gone, recording several months of record revenues in the past few quarters. Now, Simpson says, laughing heartily, he can sleep at night when he looks at his balance sheet.Simpson and other fencing contractors in Greater …