In the picture, heat-treated pine terrace deck boards. Terrace deck size 3m x 2m. "Sarkankoks" tone on 6 screw piles. Certified C24 pressure impregnated terrace deck frame. The bottom and top of the terrace deck are treated with bitumen mastic and waterproofing tape. Geotextile from below. Stainless steel screws for terrace deck boards.