We had our flat roof replaced by a WS company no longer in business back in 2004. I interviewed a LOT or roofing companies and my second choice and who I would recommend now would be Anderson Roofing on the east side.
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http://www.andersonroof.com 206-382-0064
I was also VERY impressed with their sales person, Rob Rasco who may or may not still be with the company.
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STAY FAR away from Jorve and Raynproof Roofing.