How to Build a Roller Blade Ramp

1). Make a mark on a sheet of plywood with a pencil 18 inches from a corner along the short side. Make another mark on the long side at 66 inches. Draw a line from one mark to the other using a straight edge and pencil. Cut the plywood along the line with a circular saw. Repeat with the opposite corner so there are two exact triangles.
2). Connect the two triangles at the right angle with a 2-by-4. Attach the 2-by-4 to the plywood with 2 1/2-inch galvanized wood screws. Attach another 2-by-4 to the triangles at the angle where the long sides meet, with the wide side of the 2-by-4 flush against the cut edge of the plywood.
3). Make a mark along the cut edge of the plywood every eight inches, starting at the end where the 2-by-4 is. Attach a 2-by-4 between each of the marks, with the small side of the 2-by-4 flush against the edge of the plywood. Use 2 1/2-inch galvanized wood screws to secure all of the boards. These boards will support the top of the ramp.
4). Measure 74 inches along the long side of an uncut plywood sheet and mark it with a pencil. Repeat on the opposite side, then draw a line between the marks. Cut the plywood along the marks with a circular saw. Repeat with the uncut sheet of Masonite.
5). Attach the plywood to the top of the ramp with three or four wood screws in every 2-by-4. Make sure that the plywood is flush to the edges of the ramp on all sides. Repeat with the Masonite.