Deck components comprising a post sleeve and flanges extending away from side walls of the post sleeve are described. The post sleeve has a rectangular cross section. Interior flanges can comprise attachment holes for affixing the interior flanges to box-frame-segments having square-cut edges. Box-frame-segments and box-frame-segment attachments with square-cut edges can abut the exterior surface of a post sleeve side wall. Use of the post sleeve can reduce or eliminate the need to produce beveled joints box-frame-segments and box-frame-segment attachments.