The fall, or slope, of a box gutter is a crucial factor in ensuring effective water drainage. Typically, a box gutter should have a fall of at least 1 in 200, which equates to about 5mm of fall per meter of length. However, the exact fall required can depend on factors like the gutter’s size, the roof area it’s draining, and local weather conditions. Our expert team at NJ Gutter can provide personalized advice based on your specific building requirements.