How do you support a picture-frame border on composite decking?
Provide support for both the border board and the ends of the adjoining deck boards, following the selected product instructions. A decorative trim does not replace structural support. Plan compatible fixings, movement gaps and corner details before cutting. Required gaps depend on the product, board length and installation temperature, so use the manufacturer’s current dimensions. Keep the edge detail compatible with drainage and ventilation.
Provide support for both the border board and the ends of the adjoining deck boards, following the selected product instructions. A decorative trim does not replace structural support. Plan compatible fixings, movement gaps and corner details before cutting. Required gaps depend on the product, board length and installation temperature, so use the manufacturer’s current dimensions. Keep the edge detail compatible with drainage and ventilation.