Understanding Deck Joist Cantilever Charts in New Zealand
When planning a deck project in New Zealand, understanding the principles of joist cantilever is crucial for structural integrity and safety. This guide will walk you through the essentials of deck joist cantilever, with a focus on charts and regulations specific to New Zealand.
What is Deck Joist Cantilever?
Deck joist cantilever refers to the overhanging section of a deck joist that extends beyond its support, typically the beam or the house. This allows decks to project out from the structure, providing more usable space. However, it's essential to understand the load-bearing capabilities and safety implications of cantilevered joists.
Key Factors Affecting Deck Joist Cantilever
- Joist Size: Larger joists can span longer distances and support more weight.
- Spacing: Joists closer together provide more support and can increase the cantilever length.
- Load: The amount of weight a joist can support depends on its size, spacing, and the material used.
- Material: Different materials have varying strength-to-weight ratios. Treated pine, for instance, is commonly used in New Zealand but has a lower strength-to-weight ratio than hardwood or composite materials.
Deck Joist Cantilever Charts for New Zealand
To determine the safe cantilever length for your deck, you can refer to the following charts based on New Zealand Building Codes. These charts assume standard 90mm x 45mm H3.2 treated pine joists, spaced at 400mm centres, and supporting a uniformly distributed live load of 1.5kN/m².
| Joist Span (mm) | Cantilever Length (mm) |
|---|---|
| 3000 | 600 |
| 3600 | 500 |
| 4200 | 400 |
| 4800 | 300 |
For joists of different sizes, spacing, or materials, or for non-uniform loads, consult a structural engineer or use engineering software to calculate the safe cantilever length.
New Zealand Building Codes and Deck Joist Cantilever
New Zealand's Building Code Clause B1 (Structure) requires that structures are designed and constructed to resist structural actions without excessive deformation or collapse. When designing deck joist cantilevers, ensure your design complies with the following:
- Clause B1.3.1: The structure must be designed to resist the effects of loads.
- Clause B1.3.2: The structure must be designed to resist the effects of wind.
- Clause B1.3.3: The structure must be designed to resist the effects of earthquakes.
Professional Advice for Deck Joist Cantilever
While this guide provides a basic understanding of deck joist cantilever, it's crucial to consult with a professional when planning your deck project. A registered design professional can ensure your deck complies with New Zealand's Building Codes and provides a safe, durable, and functional space for years to come.
More Details
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PROFRAME JOIST & BEARER CONNECTIONS. FramE. ALUMINIUM DECK FRAMING. Proframe Limited www.proframe.co.nz info@proframe.co.nz. +64 9 274825. CROSS SECTIONS ...
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Bearers & Joists ... SALES. NORTHPINE ENQUIRIES. Email: sales@northpine.co.nz · Free Phone: 0508 432 115. NORTHBEAM ENQUIRIES. Email: northbeam@northpine.co.nz.
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The joists should be spaced at maximum centres according to the table below. The spacing depends on the thickness of decking used. JOIST SELECTION CHART. Joist ...
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• Joists – Supporting decks more than 1m above ground. Table 5. 11 ... CANTILEVER. JOIST. CENTRES. JOIST. SINGLE SPAN. JOIST. CONTINUOUS SPAN. FLOOR PERFORMANCE.
13.11.2024 ... Floor joists can typically cantilever up to 25% of their allowable single span. So a continuous 90 x 45mm joist has a max span of 1800mm, ...
J Joist J Decking Board J Pile/Post J Bearer JOIST CENTRES Use this table to see how far different sized joists can. Maximum cantilever length of joist ...
01.10.2020 ... 0508 432 115 | www.northpine.co.nz. 34 Cove Road, Waipu ... Maximum cantilever length of joist supporting: Wall, 1.5 kPa floor ...
18.03.2025 ... Building a deck in New Zealand? Start here! In this video, we demystify the key tables from NZS 3604, including the bearer table, joist ...
Average Joist Span = (Joist Span 1 + Joist Span 1). 2. Deck Bearers. Timber. Decking. Joist Cantilever refer to table 14A. Ballustrade. (Max 25Kg/m). Loads:.
The SPEEDFLOOR® Steel Joist system offers extended spanning capability and unmatched constructional flexibility in almost any type of construction. Buy NZ Made.
Bearers for Decks in New Zealand (NZ) - information about the sizes and grades derived from tables used for bearers for a deck using ROBO Deck Designer.
