NotchLoading plan…
Loading plan…
Use your browser's Print (Ctrl/Cmd + P) and choose Save as PDF. This page works offline once you've opened it with a signal.
A window box built from PVC trim board instead of wood, sized to match the width of the window it sits under.
| Part | Qty | T × W × L | Material | ✓ |
|---|---|---|---|---|
| Front/back panels Adjust length to match your window's width. | 2 | 3/4" × 7 1/4" × 32" | 1x8 PVC | ☐ |
| Bottom | 1 | 3/4" × 6 1/2" × 32" | 1x8 PVC, ripped | ☐ |
| End panels | 2 | 3/4" × 7 1/4" × 8" | 1x8 PVC | ☐ |
| Front trim Mitered both ends. | 1 | 3/4" × 1 1/2" × 33 1/2" | 1x2 PVC | ☐ |
| Side trim Mitered one end. | 2 | 3/4" × 1 1/2" × 8 1/2" | 1x2 PVC | ☐ |
| Mounting cleats Mitered lengthwise along the top edge. | 2 | 3/4" × 2 1/2" × 30 1/2" | 1x3 PVC | ☐ |
| Item | Qty | ✓ |
|---|---|---|
| PVC trim board, 1x8, 10 ft | 1 each | ☐ |
| PVC trim board, 1x3, 8 ft | 1 each | ☐ |
| PVC trim board, 1x2, 8 ft | 1 each | ☐ |
| PVC cove moulding | 1 each | ☐ |
| PVC cement | 1 can | ☐ |
| Exterior caulk | 1 tube | ☐ |
| Finish nails, 1-1/4" | 1 box | ☐ |
| Mounting screws (Tapcon for brick, wood screws for siding) | 10 each | ☐ |
Overall cost: $$. Lumber varies by region, species, and season, so we give a band rather than a figure.
Tools: Miter Saw, Table Saw, Tape Measure. Materials: PVC trim board, 1x8, 10 ft, PVC trim board, 1x3, 8 ft, PVC trim board, 1x2, 8 ft
Measure the window's width — this sets the box's overall length. Cut all PVC pieces per the cut list, mitering the trim pieces as noted.
Tools: Brad Nailer. Materials: PVC cement, Finish nails, 1-1/4"
Glue the ripped bottom panel to one of the long side panels with PVC cement and finish nails, set in 3/4in from the edge.
Tools: Brad Nailer. Materials: PVC cement, Finish nails, 1-1/4"
Attach the two end panels with PVC cement and finish nails to close up the box.
Tools: Brad Nailer. Materials: PVC cove moulding, PVC cement, Finish nails, 1-1/4"
Attach the mitered trim pieces around the top edge, and the cleat pieces to the back for mounting.
Tools: Drill / Driver. Materials: Exterior caulk, Mounting screws (Tapcon for brick, wood screws for siding)
Caulk any remaining seams, then mount to the house with Tapcon screws on brick or wood screws on siding.