Design Timber Stud Walls to AS 1720.1
Design timber stud walls in Australia and New Zealand to AS 1720.1, for tall walls, high wind loads and heavy point loads that standard AS 1684 span tables don't cover, using real timber grade properties rather than simplified assumptions. Axial, bending and combined-action checks run automatically, with sheathing and bracing conditions factored into every result. Try the calculator to specify a wall configuration you can take straight to certification.
Start Designing for Free See Integrated Suppliers- AS 1720:2010, NZS AS 1720:2022 (EN 1995-1-1 also supported)
About Timber Stud Wall Design
When the Tables Aren't Enough
For standard houses, AS 1684 (Residential Timber Framed Construction) is the bible. But modern architecture—with high ceilings, large window openings, and extreme wind categories—often pushes framing beyond the scope of the standard tables. The SPEC Toolbox Stud Wall Calculator performs a first-principles engineering analysis to AS 1720.1. It allows you to verify studs for specific heights (e.g., 3.6m), localized wind pressures, and heavy point loads that simplified span tables simply cannot handle.
The engineer's guide
Timber Stud Wall Design, AS 1720.1
What This Calculator Does
This tool analyzes a vertical timber stud as a structural Beam-Column under combined Gravity (Roof/Floor) and Lateral (Wind) loads. It verifies:
- Axial Capacity (Nd): Checks compression capacity, calculating the column stability factor (k12) based on the effective buckling length.
- Bending Capacity (Md): Checks resistance to out-of-plane wind pressure.
- Combined Actions: The critical engineering check — verifies interaction between Axial Compression and Bending Moment, ensuring the stud doesn’t buckle under combined stress.
- Bearing (Np): Checks compression perpendicular to grain on the wall plates (top and bottom plates).
- Wind Deflection: Calculates lateral deflection limits (e.g., Height/180) to protect glazing and linings.
Overview of Light-Frame Timber Stud Design
Light-frame timber construction is one of the most widely used structural systems for residential and low-rise buildings. Vertical timber members («studs») transfer loads from floors and roofs down to the foundation while stabilized by horizontal members and structural sheathing. SPEC Toolbox provides a dedicated Stud Design calculator evaluating axial compression, bending effects, buckling behavior, and stability per Australian timber design provisions.
Supported standards: AS 1720:2010, NZS AS 1720:2022, EN 1995-1-1:2004 (Eurocode 5).
Timber Stud Properties
Parameters: Timber grade, Stud width (b), Stud depth (d), Stud spacing. Stud spacing determines tributary load area transferred from floors/roofs to each stud.
Wall Type: Discrete wall (each stud independent) or Continuous wall (load redistribution between members).
Sheathing and Bracing Conditions: plywood, OSB, or structural boards; whether sheathing is present, whether it provides lateral support, whether braced battens are installed — influences effective buckling length and lateral stability.
Timber Design Standards
- AS 1720:2010 – Timber Structures
- NZS AS 1720:2022 – Timber Structures
- EN 1995-1-1:2004 – Eurocode 5
Load Cases and Combinations
Load types: Permanent loads (G), Imposed loads (Q), Wind loads (W), Snow loads (S). Loading Code: AS/NZS 1170.0:2002 – Structural Design Actions. Load Combination Settings: load combinations, loading code, combination factors (ψ-factors for probability of simultaneous variable load occurrence).
Axial Loads
Distributed loads: Permanent load (gk), Imposed load (qk), Wind load (wk), Snow load (s) — represent tributary load carried by each stud.
Lateral Loads: wind pressure generates bending in studs; lateral loading values used to calculate bending stresses and combined bending/compression effects.
Automated Stud Capacity Checks
- Bending Design: verifies sufficient bending capacity under lateral loads.
- Compression Check: evaluates axial compression resistance.
- Strength Interaction Check: ensures combined axial and bending stresses remain within allowable limits.
- Buckling Verification: checks global buckling resistance under axial compression.
- Lateral Torsional Stability: evaluates resistance against lateral torsional instability from bending and compression.
Timber Stud Wall Design, AS 1720.1
Is this compliant with NCC?
Gratis, basado en navegador, sin descargas. Diseñe cualquier conexión certificada con sus materiales reales en segundos.
Empieza a diseñar gratis →Ponga sus productos ante cada ingeniero que especifica en la plataforma, justo en el momento del diseño.
Logre que especifiquen sus productos →
