How to build a basic square pergola
Handsome wood trellis turns a patch of backyard into a shady kick-back space
This 8-foot-square trellis provides an inviting place to relax and enhances the view of the garden from the house. These homeowners were handy enough to build it themselves, but you could have a contractor do it for you.
From Sunset 's Patio Roofs & Gazebos book
- Concrete, #4 rebar & form lumber for footings
- 6x6 posts, pressure-treated
- 2x8 beams
- 2x4 trellis stock
- 1x8 trim
- Galvanized nails & outdoor screws
- Sanding & finishing supplies
- Paint, stain, or wood preservative
1. Lay out the post locations by using batterboards and string so that the outside dimension of each “side” is 94½ inches. Measure for equal diagonal dimensions to verify that the structure will be square. Mark the batterboards.
2. Dig holes for the footings. Set each post on about 3 inches of gravel at the bottom of each hole. Hold the posts plumb by placing diagonal braces at right angles to each other. Pour the footings.
3. Using a level and an 8-foot-long straight board, or a water level, mark the tops of the posts at 8 feet, 2½ inches. Clamp or tack a saw guide to the posts to ensure a safe and accurate cut with a circular saw. Be very careful when cutting while standing on top of a ladder.
4. Cut the two long beams to length, and cut the ogee detail. Make a template for the ogee detail by using a jigsaw and 1⁄4-inch plywood or similar scrap. Then clamp the template onto the beams to guide your cuts. Lay out the tops of the beams for the 12-inch-on-center 2 by 4s. Secure them with exterior nails or screws.
5. Cut the two side beams to length―equal to the outside post-to-post distance―and then secure the beams flush to the post tops with exterior nails or screws.
6. For each post, rip two fascia boards that are about 3⁄16 inch wider than the post width and two that are 1½ inches wider than these.
7. Cut a 3⁄4-by-7¼-inch notch at the top of one inside-corner fascia board for each post so it will fit around the beam. Nail the two outside-corner boards together, and then secure them to the posts; do the same for the inside-corner boards.
8. Cut the lower 2-by-4 trellis members to length. Lay one across the top of the long beams on one end, center it for an equal overhang on each side, and then mark the 1-by-1½-inch notches where the member crosses the two beams. Use this piece as a template for cutting the notches in the other 2 by 4s that run this direction.
9. Cut the top 2-by-4 trellis members to length. Locate and cut the notches in the bottoms of them as you did for those in the
first course. Predrill pilot holes, and then toenail the members onto the tops
of the first course of trellis.
10. Sand the fascia, and ease the corners to eliminate any splinters. Touch up the primer as needed, and apply a topcoat of 100
percent acrylic latex paint to the entire structure.
Next: Building and design notes