Describir: Span tables for wood joists, rafters and beams

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 /_____// | || | || | || | ||   / _ \\  |      \\  /_   _// | \  / || 
 `____ `  | || | || | || | ||  / //\ \\ |  --  //   -| ||-  |  \/  || 
 /___//   | \\_/ || | \\_/ || |  ___  |||  --  \\   _| ||_  | .  . || 
 `__ `     \____//   \____//  |_||  |_|||______//  /_____// |_|\/|_|| 
 /_//       `---`     `---`   `-`   `-` `------`   `-----`  `-`  `-`  
 `-`                                                                  
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