Determine the size of the “square” that you need, as well as the number of sides. You might be able to get away with a 2-sided screen vs a 3-sided screen.
Now we need to route a groove in the 2×2. The size of the groove is 3/4”x 3/4” for one piece of lattice (if you plan to use 2 layers of lattice, make the groove 1″ x 1″) and we used the table saw to make this groove.
Cut the 2×2 pieces to length using the miter saw set at a 45-degree angle. You should have four pieces when you are done and they should fit together like a picture frame.
Lay the 2×2 pieces out on a flat surface. Don’t screw them together just yet. Once you have the 2×2 laid out and dry fit, measure the distance from groove to groove.
Now it is time to cut the lattice. You will cut the lattice like you would a piece of plywood. Once you have marked the size, use the circular saw to make the required cuts.