Decking Spindle Calculator UK

Spindle Calculation Formula:

\[ \text{Number of Spindles} = \left\lfloor \frac{\text{Rail Length}}{\text{Spindle Width} + \text{Maximum Gap}} \right\rfloor + 1 \]

Number of Spindles:

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1. What is the Deck Spindle Calculator?

The Deck Spindle Calculator helps determine the number of spindles needed for deck railings according to UK building regulations. It ensures proper spacing and compliance with safety standards for deck construction.

2. How Does the Calculator Work?

The calculator uses the following formula:

\[ \text{Number of Spindles} = \left\lfloor \frac{\text{Rail Length}}{\text{Spindle Width} + \text{Maximum Gap}} \right\rfloor + 1 \]

Where:

\( \text{Rail Length} \) — Total length of the railing in meters
\( \text{Spindle Width} \) — Width of each spindle in millimeters
\( \text{Maximum Gap} \) — Maximum allowed gap between spindles in millimeters

Explanation: The formula calculates how many spindles can fit within the rail length while maintaining the maximum permitted gap between them, plus one additional spindle.

3. UK Building Regulations for Deck Railings

Details: UK building regulations require that gaps in deck railings should not allow a 100mm sphere to pass through. This ensures child safety and prevents accidents. The maximum gap between spindles is typically 99mm to comply with this regulation.

4. Using the Calculator

Tips: Enter the total rail length in meters, spindle width in millimeters, and maximum permitted gap in millimeters. All values must be positive numbers with rail length and spindle width greater than zero.

5. Frequently Asked Questions (FAQ)

Q1: What is the maximum gap allowed between deck spindles in the UK?
A: The maximum gap should not exceed 99mm to prevent a 100mm sphere from passing through, as per UK building regulations.

Q2: How do I measure rail length accurately?
A: Measure the total horizontal distance where spindles will be installed, between the supporting posts.

Q3: Should I include the post width in my calculations?
A: No, the rail length should be measured between the inner edges of the supporting posts.

Q4: What if my calculation results in a fractional number?
A: The calculator uses floor function and adds one spindle to ensure you have enough spindles while maintaining proper spacing.

Q5: Are there different regulations for commercial vs residential decking?
A: While the 100mm sphere rule applies to both, commercial properties may have additional requirements. Always check current building regulations.