"Farther" vs. "Further" in Inspection Reports

by Nick GromickoCMI®

Merriam-Webster Dictionary states that farther and further are interchangeable. However, recently, their use is becoming distinguished by grammarians. Here is the difference:
 Farther should be used to show a relation to physical distance:

“The downspout should discharge farther from the house.”

 A little trick is to see if an actual distance can be used in place of the word farther in your sentence:

“The downspout should discharge 6 feet from the house.”  
If it can, you were correct in using farther.
Further should be used when referring to degree, time, space, or extent or depth, as in: 
“This problem should be investigated further by a roofing contractor.”