Picture-frame box wainscot anatomy — baseboard, margins, box, stile, and chair-rail cap

Box wainscot parts: baseboard, bottom margin, box, stile, top margin, chair-rail cap. Box width = (L − 2·margin − (b − 1)·stile) ÷ b.

What this diagram shows

A picture-frame (box) wainscot elevation labeling every part. A chair rail or cap runs along the top and a baseboard along the bottom; between them sit three applied moulding boxes. Equal end margins hold the outer boxes off the wall ends, a stile separates adjacent boxes, and equal top and bottom margins center the boxes vertically. Box width solves as (wall length − 2 × margin − (boxes − 1) × stile) ÷ boxes, and box height is the field between the baseboard top and the chair-rail bottom minus twice the vertical margin.