Abstract: A siding trim piece has a low gauge layer (preferably metal) of preferably about 0.013 gauge, with a substrate material (preferably foam) laminated to the low gauge layer. An edge of the siding trim piece preferably has an integral J channel. The substrate material is fixed to the structure preferably by an adhesive. A method for siding a structure includes the steps of covering the trim, edges and corners in a structure with the siding trim pieces having an integral J channel, and covering the exterior surfaces with siding by inserting ends of the siding into the J channels of the siding trim pieces to abut the siding with the trim, edges and corners of the structure without interposing a separate intermediate seam covering material between the siding, corners, edges and trim. The invention provides a wood-like appearance and avoids the appearance of discontinuities between the siding and trim, edges and corners of the structure.