Measure the dimensions of your lattice skirting pieces. Cut four 1-by-4-inch boards, which will form the frame, based on these measurements.
Arrange the four 1-by-4 boards into the shape of a rectangle. Attach the areas where the wood pieces meet by lining up corner joints, which are L-shaped pieces of metal, along the bottom sides of each corner. Install 3/4-inch screws in the corner joints.
Position a 6-inch mending plate (a flat strip of metal) along the top edge where two frame boards meet. Screw the plate into place across the two frame boards for secure attachment of the frame. Place one mending plate at each spot where two boards touch.
Lay your piece of lattice on the completed frame. Attach it to the frame by placing 1-inch panhead screws through washers throughout the border. Turn the frame over to install the skirting along the deck or porch.