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UK Joist Deck Formula:
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The UK Joist Deck calculation determines the required decking joist size in millimeters based on load, span, and material strength. This calculation is essential for structural integrity and safety in UK decking construction projects.
The calculator uses the UK Joist Deck formula:
Where:
Explanation: The formula calculates the required joist size by dividing the product of load and span by the material's strength capacity.
Details: Accurate joist sizing is crucial for structural safety, preventing deck failure, and ensuring compliance with UK building regulations for outdoor structures.
Tips: Enter load in kN, span in meters, and material strength in MPa. All values must be positive numbers greater than zero for accurate calculation.
Q1: What is a typical strength value for decking joists?
A: Common strength values range from 5-24 MPa depending on the wood species and treatment. C24 graded timber typically has 24 MPa bending strength.
Q2: How do I determine the load for my deck?
A: Load calculations should include dead loads (decking materials) and live loads (people, furniture). Typical design load is 1.5 kN/m² for residential decks.
Q3: What span limitations apply to deck joists?
A: Maximum spans vary by joist size and spacing. Generally, 47x145mm joists at 400mm centers can span up to 2.7m for domestic decks.
Q4: Does this calculation account for deflection?
A: This basic calculation focuses on strength. Deflection limits (typically span/360 for decks) should be checked separately for comfort and safety.
Q5: Should professional verification be obtained?
A: For large decks, complex designs, or elevated structures, always consult a structural engineer to verify calculations and ensure compliance with building regulations.