How to Build a Sail Cloth Patio Cover

Measure the sail cloth. Add 2 feet to the measurements to accommodate the connections to the posts.

Measure the patio space. If the sail cloth is too large, cut it to 18 inches smaller than the patio. Fold the cut edges over 1 inch, then fold again to make a 2-inch hem. Sew using a sewing machine and heavy duty thread.

Add grommets as needed to the sail cloth. A used boat sail will already have grommets, however, a piece of shade cloth or canvas will require a grommet in each corner. Use a grommet kit and hammer according to the manufacturer's directions.

Set 4-by-4-inch posts at the outside perimeter, aligned with the shape of the sail cloth. Dig a 2-foot-deep post hole at each corner. Fill with water and allow it to soak into the soil.

Add 4 inches of crushed gravel to the bottom of each hole. Set the posts into the holes. Fill each hole with a bag of concrete mix and add water. Check to ensure the posts are vertical with a spirit level. Allow to dry completely.

Predrill and screw a lag screw into the top of each post, facing the patio.

Attach the sail cloth to the lag screws with clip rings or turnbuckles. Pull the cloth tight.