Open Joint Siding

The open-joint method can be used with either board or panel siding. While most often used in commercial construction, it’s gaining popularity in residential applications, too.

With narrow siding, such as these 4-inch cedar boards, two full layers of underlayment were required for UV protection.

Where wider panel siding was used, a full single layer was applied, followed by 6-inch strips beneath panel joints. The vertical "streamer" is a temporary sheet-plastic downspout.

A custom sheet-metal shop fabricated battens and metal trim elements for the project, including inside corner trim.

Outside corners received X-profile trim. The horizontal aluminum "belly band" was fastened to the sheathing with gasketed screws, which were driven into slightly oversized holes to allow for thermal expansion of the metal.

Fiber-cement wall panels were fastened with ring-shank stainless nails. Two battens were used at vertical joints, one on each side of the gap.

Horizontal panel joints are continuous around the building; panel layout was designed to avoid easily broken narrow rips above or below the windows.

Wooden gauge blocks were used to maintain a consistent 1/4-inch spacing. Panel faces were prefinished, and all cut edges were painted before installation.

The architect specified a trimless window design, in which both the cedar siding and the fiber-cement panels stopped short of the exposed frames, leaving a reveal that matches those between courses.

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