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Spindle Spacing Formula:
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The spindle spacing calculation determines the equal spacing between multiple spindles on a deck railing. It ensures uniform appearance and proper structural support while accounting for the width of each spindle.
The calculator uses the spindle spacing formula:
Where:
Explanation: The formula calculates the equal space between spindles by subtracting the total width of all spindles from the total length, then dividing by the number of gaps (which is always one more than the number of spindles).
Details: Correct spindle spacing is crucial for both safety and aesthetics. Building codes often specify maximum spacing (typically 4 inches) to prevent small children from falling through. Uniform spacing also creates a professional, balanced appearance.
Tips: Measure the total length between posts in feet, measure spindle width in feet, and count the number of spindles needed. All values must be positive numbers (length > 0, width ≥ 0, number ≥ 1).
Q1: What's the typical maximum spacing allowed by code?
A: Most building codes require spindle spacing no greater than 4 inches (0.33 ft) to prevent child accidents.
Q2: How do I account for the posts in this calculation?
A: The length should be measured between the inner surfaces of the two end posts. The posts themselves are not included in this calculation.
Q3: What if I get a negative spacing result?
A: A negative result means your spindles are too wide for the given length. Either reduce spindle width, decrease number of spindles, or increase the total length.
Q4: Should I round the spacing for practical installation?
A: Yes, you may need to round to the nearest 1/8 or 1/16 inch for actual installation while maintaining uniform spacing.
Q5: How does this differ for stair railings?
A: For stairs, you typically calculate spacing based on the slope (not shown in this calculator) to maintain vertical alignment of spindles.