The 2x6 cedar stock for the top and bottom frames of the louvered section receives a 20° bevel, which helps prevent water from collecting on the horizontal surfaces.
After drilling for pocket screws, the author applies exterior glue to all of the frame joints.
Author assembles the frames on a flat surface, driving pocket screws to secure the corner joints.
After cutting four posts for the corners of the louvered section of the cupola, the author chamfers the edges of posts on a router table. Stops clamped to the table fence govern the amount of chamfer cut into each edge.
Layout lines at the corners of the frame guide the placement of the corner posts.
Frame for the top of the louvered section goes together like the bottom frame with the joints glued and pocket-screwed.
A beveled sill nails to the bottom frame to help shed water from the horizontal surfaces.
Author lays out louver jambs, spacing the louvers evenly from top to bottom, and marking them at a 35° angle, leaving enough room at the top for an arched frieze.
Louver stock is ripped with a 35° angle along one edge. To install the louvers, spacer blocks glue and nail to the jambs first, and then the louver stock nails in on top of the blocks.
To scribe the arch for the frieze board, author uses a batten made from a thin rip of wood.
A band saw cuts the arch in each of the frieze boards. After smoothing the edges, a chamfer is added along the outer face.