The majority of shade sails are too large to fit inside the width of fabric off the roll therefore, they are made by joining strips of shadecloth together to form a larger panel – this process is called seaming.
Seams should be carefully located with aesthetics in mind – sails after all are not just functional and should include an architectural element. Lets say your sail is 4m wide and the fabric width is 3.6m wide – where is the seam going to be located. All too often a cheap sail will be made by joining a thin 400mm strip of fabric to one side of the 3.6m to make the 4m – while functional and low cost –visually, it is very unattractive.
Another common problem is the method used for seaming – the 3 common methods used are shown below – professional high performance sails should be made using the French Seam with 2 rows of lock stitching to provide full shear capacity: