Screen Mesh Width & Length Limitations
The length of your tarp may be of any length up to 100 feet. However, tarp lengths of more than 20 to 30 feet are difficult to handle and it is suggested that you keep the lengths reasonable. 
The maximum width of your tarp, without placing a seam in the tarp, is determined by the screen mesh material as it comes from the factory.
Maximum Screen Material Widths
Super Screen 17/14 30% Solar:  96"
Super Screen 20/17 43% Solar: 96"
Super Screen 80% Solar/Privacy 96"
PolyCB2 17/14 28% UV/Solar Block: 96"
PolyCB2 20/17 47% UV/Solar Block: 96"
PolyCB2 HD60 (Topside™ 60% Solar/UV Block: 120"
PolyCB2 MX-90 ( 90% Solar/UV Block ): 96"
Most often it is best to to cover large areas with several tarps rather than with one large seamed tarp. If you are ordering a tarp where both the length and the width exceed the factory maximum material widths. ProTect will automatically seam the tarp for you.
Notice: If you have preferences relating to the placement of a  seam, please make them known in the "Special Instructions" box at the bottom of the ordering page.
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When calculating size of tarps, 
grommet centers are 1'' from edges.