Kraftwerks Sheet Metal & Slate Inc slate roofing, copper roofing, tin roofing We are a small contractor specializing in slate roofing, slate repairs, copper roofing and tin roofing. We provide fabrication of ornamental sheet metal and skylights. Serving Washington,DC, VA & MD. Kraftwerks Sheet Metal & Slate, Inc, copper standing seam, tin standing seam, custom skylights, copper gutters, slate repairs, slate roofing, copper roofing, tin roofing