Determine where you will install the sun sail. Make sure there is enough room for the sail and something to attach it to.
Figure out how to angle the sail. A sail will need a lower point somewhere so that water can run off. Install a square-shaped sail with two diagonal corners lower than the other two. If you have a triangular sail, place one end higher than the other two.
Decide what posts or attachments to use. Sun sails can be attached to a wall of a house, trees, pergolas, terraces or posts in the ground.
Lay your sail over the area where you will put it up.
Dig holes about 16 inches wide by 4 inches deep. Pour gravel into the holes, set your posts and fill with concrete.
Secure hooks or grommets to the posts. If you are using a side of house or other surface, attach the hooks or grommets there, too.
Attach your sail to the fixing accessories you installed.