Canopies, shade covers for outdoor areas such as patio decks, often use canvas and metal, plastic or wood framing to hold the canopy cover into a square or rectangle position. If you need to replace the canvas canopy cover, measure two adjoining sides to get the size of your canopy for replacement.
Place the end of your tape measure in the centre of one of the frame rails that make up the base of the canopy framing. If necessary, stand on a ladder to reach the apex.
Extend the tape measure across the apex of the canopy frame and down to the other frame rail that runs parallel with the first frame rail. Take the measurement and write it down.
Place the end of the tape measure against the frame rail to the right or left of the first frame rail.
Extend the tape measure over the apex and down to the frame rail that runs parallel. Take the measurement and write it down.
Compare the measurements you collected with the measurements listed on the packaging for the replacement canopies you are looking at. You will notice that most canopy products list the measurements in whole numbers such as 12 by 12 feet. If your measurements are slightly off from round numbers, for example 12 1/8 by 12 1/4 feet, round down or up to the nearest whole numbers. In this example, purchase a 12 by 12 canopy.