Skirting the Issue
Flashing the skirt board marks the start of siding installation
A two-man team applies ZIP System tape to metal flashing above a Versatex PVC skirt board.
The low-to-no-maintenance exterior of Boardwalk Builders' 2019 Model Remodel East house uses a 1-by skirt board fashioned from Versatex’s PVC trimboard. Scarf joints were glued, then fastened in place with trim screws . The Versatex trim came with a feature the company calls “Peel ‘n Neat,” a protective film that keeps the boards from accumulating dirt and small scratches while being stored and handled on site. After installation, the film peels away, leaving a clean, like-new surface—a handy feature given the amount of mud on the jobsite from an unusually rainy spring and summer.
The 1-by Versatex PVC skirt board was scarf-jointed and glued [1A], and fastened with trim screws [1B]. The trim was equipped with Peel 'n Neat, a protective film that keeps the boards free of dirt and minor scratches during storage and handling, and peels away easily after installation, leaving a clean surface [1C].
The siding used on the house is Tando’s Beach House Shake, a panelized polymer cladding that comes in a variety of colors that mimic the look of natural and weathered cedar shingles. We’ll look more closely at the siding installation in a future post, but the focus here is on the detail at the skirt board.
Each Beach House Shake panel connects with the panel below it by means of interlocking tabs that engage when the higher panel is pushed upwards against the lower panel . This same interlock (which promotes good drainage) applies to the first course, which attaches to a starter strip that not only anchors the bottom edge of the panel but also properly spaces the panel off the sheathing. However, when used in connection with a skirt board—a less-common detail with shakes that was nonetheless used here—the upward motion creates a gap above the skirt board that needs to be flashed.
Tando’s Beach House Shake panels connect at the bottom by means of interlocking tabs that engage by pushing upwards on the upper panel. The connection anchors the bottom edge of the panels and promotes good drainage.
The solution was to install metal z-flashing over the skirt board and seal the upper edge with ZIP System flashing tape  from Huber Engineered Woods, which was rolled in place like any other ZIP-taped joint to ensure adhesion. When the siding panels were attached to the starter strip, the flashing bridged the visual gap between the siding and the skirt board while also promoting drainage.
Metal flashing sealed with Huber's ZIP Tape will bridge the visual gap between siding panels and the skirt board while promoting drainage.