The Design Platform Connecting Product Suppliers With Product Specifiers
We eliminate the technical barriers between specifiers & your product.
Contact Us To Integrate Your ProductsHow Do You Eliminate The Technical Barriers For Your Product
The Old Way
Share Data By PDF
Customer Build Spreadsheets
The Expensive Way
Building Your Own Proprietary Software
manage It Yourself
The Easy Way
Enabling Software Can Make It Easy For Specifiers To Choose
Our Approach
Make It Accessible
Our software makes mass timber accessible for engineers of all experience levels.
Make It Frictionless
Our software makes it easy for engineers to design in your product.
Make It Preferred
Our software helps generate leads and volume for our supply chain partners.
Recent Product Updates
The Fastest Growing Platform for Timber Specification
Release 2.1.8 - Analysis & One Page Summaries!
Release 2.1.7 - Screw Connections
Release 2.1.6 - Major Updates & New National Annexes
Release 2.1.5 - New Bracket Calculator Category
Release 2.1.4 - Fire Design!
Release 2.1.3 - Focus on Perpendicular to Grain Compression
Release 2.1.2- USA and Canada Beta Version
Release 2.1.1 - CLT to Steel Beam Connection Details, Dowel/Bolt Updates, Screw Filtering & More!
Engineering Engagement
200+ Engineering Presentations / Year
8+ Customer Support Tickets Logged Per Month
Quality Assurance Processes
Enabling Specification Is The Final Step
Build manufacturing Capacity
Product
Development
Product Enable Specificcation
Common Features – Software Features
PDF Infrastructure – Users can elect “summary” or “detailed PDF print outs for certification.
25+ Languages – Every bit of code on platform wrapped with DeepL language translation potential.
Educational Features – Educational slug infrastructure enables simplified education or users.
Comprehensive Analytics – We embed analytics deep into our calculators.
Application Security – We continually invest in the latest security technologies to mitigate risk and protect data across the entire platform
Enterprise Features – Companies can share access to projects & calculators.
- CLT
- Glulam/LVL
- Screws
- Brackets
- Light Frame
CLT Diaphgram Design Calculator
Get started with a comprehensive approach to diaphragm design by defining forces, material properties, and applying Eurocode 5 parameters. Begin by defining the input forces acting on the diaphragm in the X-direction and selecting screw types for stiffness calculations. Setting the geometry and orientation of the diaphragm in the user inputs, type of panel connections, and panel width with the technical information from CLT suppliers. Input forces for both ULS and SLS, considering force direction. Understand in-plane shear values, required lamination data, and key design parameters for Eurocode 5. Finally, analyze deflection results, the underlying theory, action forces, and strength checks to ensure a precise and efficient design.
CLT Floor Design Calculator
Join us as we explore everything from choosing the ideal CLT panel—whether you’re opting for a supplier’s product or manually entering your own data—to selecting the right National Annex, defining loads, and refining the finer details. This video walks you through each stage, including structural analysis, stiffness calculations, and even the integration of edge-glue lamellas into your design.
We’ll also examine how various vibration techniques affect your structure and reveal how you can optimize your design by factoring in the in-plane stiffness of the concrete screed and the influence of flexible support. Plus, you’ll be able to track results and formulas throughout the process, ensuring you’re always in the know.
Let’s get started!
CLT Shear Wall Design
Glad to announce that the Second Version Of Our CLT Shear Wall Calculator is now LIVE!
After 12 months of listening to user feedback, we’re excited to release an enhanced and more robust tool for shear wall design.
CLT Shear Walls have excellent in-plane strength and can serve as a reliable lateral load resisting system.
The second version of the calculator includes features such as five cutting-edge load transfer methods—leveraging research from Casagrande, Wallner-Novak, Tomasi, Pei, and Reynolds. We’ve also added lateral deformation checks and panel stiffness calculations following ProHolz 2014 Guide. Finally, we also include the In-plane Design of CLT as according to both Proholz 2014 & FP Innovations 2019.
We’re putting the shear wall calculator on the free version for the month of October.
CLT Floor Fire Design
We’re excited to launch the long-awaited Fire Design module for CLT floors, now available alongside the ambient design calculator on CLT Toolbox.
This tutorial walks through how the new module works, including which standards are supported and how char depth is calculated layer by layer.
Key features include:
• Support for multiple fire models:
– Draft Eurocode 5 (prEN 1995-1-2:2023)
– Austrian National Annex (ÖNORM B EN 1995-1-2:2011)
– Standard Fire Tests (ISO 834 / EN 1363-1)
• Flexibility to define protection layers and fire-exposed sides
• Automatic layer-by-layer charring depth calculations over time
• Clear logic for bond-line failure and glue-line degradation
• Full PDF export with all intermediate steps, safety factors and inputs
Built to give engineers transparency, accuracy, and speed for CLT fire design.
CLT Diaphgram Design Calculator
A complete guide to setting up and analyzing diaphragm behavior in the X-direction using CLT Toolbox. You’ll define screw types for stiffness calculations, set panel geometry, connection types, and panel widths. We cover how to input ULS and SLS forces, and explain required in-plane shear values and lamination data. The video finishes with a breakdown of deflection results, force actions, and strength checks per Eurocode 5.
CLT Wall Calculator
In this video, you’ll learn how to design a typical CLT wall element step by step. We’ll cover selecting a CLT supplier, using the right functionalities, dynamic images, and educational content to determine the optimal panel thickness and design. You’ll also see how to switch between Platform and Balloon framing types, apply different eccentricity methods, and add in-plane and out-of-plane loads -giving you a solid understanding of the basics of CLT wall calculations and design.
Mass timber is shaping the future of sustainable construction. With record-breaking timber buildings emerging worldwide, mastering CLT design is more relevant than ever. Check out our CLT Toolbox app for powerful design tools, automated calculations, and expert insights to help you streamline your CLT projects!
CLT Floor Design Calculator
From selecting the right CLT panel—whether from a supplier or with manual input – to defining loads, and fine-tuning specifics, this video covers it all. We’ll go step by step through analysis, stiffness calculations, and even incorporating edge-glue lamellas into the design.
You’ll also see how different vibration methods impact your structure and how to optimize your design by considering in-plane stiffness from the concrete screed and flexible support.
Plus, you can track results and formulas throughout the entire process—so you always know exactly what’s happening.
Let’s dive into CLT Toolbox together.
Spline Connection Calculator
Learn how to design a CLT spline panel-to-panel connection using input forces from diaphragm calculations. Selecting the CLT supplier, spline width, density and material, with an explanation of proper screw selection and availability for setting different screw suppliers, their screw families and screw types. For each group, there is educational content helping to select the right screw product. Easily switch between analytical methods, including the current and new Eurocode 5 approaches.
Half Lap Connection Calculator
Learn how to use the CLT Toolbox Half-lap calculator to model a floor-to-floor diaphragm connection. We start with selecting the CLT layup, supplier, and lap width, and then walk through the difference between discrete and continuous calculation modes. Explore screw supplier options, screw families, and ETA-based optimization.
Spline Connection Calculator
In this video we are walking you trough the Spline Joint Calculator. Design a spline connection between CLT panels with confidence. This tutorial explains how to input diaphragm forces, choose the right spline dimensions, material density, and CLT supplier. You’ll also learn how to select appropriate screws—by supplier, type, and family—using the educational content built into the CLT Toolbox. Easily switch between analytical methods and compare current vs. new Eurocode 5 calculations.
Half - Lap Connection Calculator
Discover how to use the CLT Toolbox Half-Lap Calculator to design diaphragm floor-to-floor connections. Start by selecting the CLT layup, supplier, and lap width, then explore the differences between discrete and continuous calculation options. Dive into screw selection, including suppliers, types, and families, while understanding the workflow behind each choice. Input the appropriate loads and optimize screw design using supplier-specific ETA methods for a precise and efficient connection
GLT Beam Penetration Design
The GLT Beam Penetration Calculator simplifies the design process for structural beams with penetrations. The features of this calculator are as follows:
Design Standards: Adheres to Eurocode (prEN 1995:2023) or AS 1720:2010/NZ WDG Ch12.6.
Material Input Options: Choose between manual input or a preferred partner supplier.
Penetration Shapes: Covers rectangular and circular-shaped penetrations up to five penetrations.
Beam Type: Focuses exclusively on simply supported beams.
Load Combinations: Offers input design forces. Strength Verification: Includes built-in checks for geometric limitations, tension capacity, flexural capacity, and shear capacity.
Reinforcement Check: Provides screw reinforcement geometry and design checks.
GLT Beam Penetration Design
The GLT Beam Penetration Calculator simplifies the design process for structural beams with penetrations. The features of this calculator are as follows:
Design Standards: Adheres to Eurocode (prEN 1995:2023) or AS 1720:2010/NZ WDG Ch12.6.
Material Input Options: Choose between manual input or a preferred partner supplier.
Penetration Shapes: Covers rectangular and circular-shaped penetrations up to five penetrations.
Beam Type: Focuses exclusively on simply supported beams.
Load Combinations: Offers input design forces.
Strength Verification: Includes built-in checks for geometric limitations, tension capacity, flexural capacity, and shear capacity.
Reinforcement Check: Provides screw reinforcement geometry and design checks.
Vertical Bracing Member Design
Learn how to design vertical bracing diagonals using the CLT Toolbox Member calculator. This video walks you through importing force data from external analysis tools, identifying maximum tension and compression forces, and selecting the correct inputs—grades, sections, design codes, and applied loads. Get a clear overview of the results, including material properties and design checks based on Eurocode.
Mass timber is transforming modern construction with its sustainable, low-carbon footprint—offering a powerful alternative to traditional building materials. CLT Toolbox is here to support you every step of the way in designing your dream project with confidence and precision.
Timber Column Calculator
In this video, we walk you through designing Timber Column using tributary area loads, all in line with Eurocode 5 guidelines. We begin by selecting the right material and national annex, ensuring your starting point is solid and up to code. Next, we show you how to input the appropriate loads from the columns above as well as from the supported beam. We also cover the crucial step of adding lateral wind loads. As we progress, you’ll see how to optimize your column’s cross-section for both strength and efficiency.
At CLT Toolbox, we’re passionate about mass timber, it’s sustainable, innovative, and changing the way we build. We love how it packs strength, durability, and environmental benefits into one smart package. In our video, we break down the process with straightforward tips and clear explanations so you can put these methods into practice on your own projects. If you’re ready to move your design work into the future, stick around and let’s dive in together.
Vertical Bracing Member Design
Learn how to use the CLT Toolbox Member Calculator to design a vertical bracing diagonal. We’ll walk you through importing analysis results from external tools, identifying maximum tension and compression forces, and selecting the right inputs—grades, sections, code specifics, and forces. Plus, we’ll break down the results, covering material properties and all key design checks. CLT Toolbox is here to be your partner in designing timber projects!
Beam Notch Calculator
Design & Verification of a GLT Beam Notch According to EC5 with CLT Toolbox
The key question: does the reduced cross-section provide enough capacity, or is reinforcement with screws required?
Here’s what we covered in this video:
– How to check notch capacity using EC5
– When and how to use reinforcement screws based on ETA data from suppliers
– Introduction to screw geometry inputs
– How screw position, orientation, and quantity can optimise the design
A practical guide to achieving safe and efficient timber connections. Would love to hear your thoughts or experiences with similar designs!
Timber Column Calculator
In this video, we’ll walk you through designing Timber Column using tributary area loads, following Eurocode 5 and AS1720 standards. We start by selecting the right material that not only meets the structural demands but also fits the design requirements. Then, we detail how to input the loads from the columns above and the supported beam, ensuring every force is accounted for. An essential part of this process is incorporating lateral loads from wind. We also demonstrate how to optimize the cross-section to enhance both efficiency and performance.
At CLT Toolbox, we’re passionate about #masstimber – it’s sustainable, innovative, and changing the way we build. We love how it packs strength, durability, and environmental benefits into one smart package. In our video, we break down the process with straightforward tips and clear explanations so you can put these methods into practice on your own projects. If you’re ready to move your design work into the future, stick around and let’s dive in together.
Screws: Laterally loaded timber to timber end grain
We are thrilled to release the Laterally Loaded Timber-to-Timber End Grain Module, a powerful tool for engineers designing connections with screws subjected to lateral loads. This specialized calculator ensures accuracy and flexibility for timber connection designs.
Key Features:
• Design Codes: Supports three design codes for laterally loaded screws: EN 1995:2004, AS 1720:2010, and prEN 1995:2023.
• Supplier Input: Input screws from top suppliers like Rothoblass, Eurotec, Sihga, Spax, and Simpson’s Strong Tie.
• Manual Input: Allows manual entry of screw parameters, including dimensions and material properties.
• Flexible Calculations: Perform calculations based on the selected supplier’s ETA document or design code.
• Dynamic Diagrams: Interactive diagrams that update based on your input data, visualizing load paths and screw performance.
• Comprehensive Summaries: Detailed summaries with geometry checks and shear capacity utilization, providing reliable data for design decisions.
• End Grain Connections: Specifically designed to calculate timber connections with screws fixed on the end grain direction.
This specialized calculator helps engineers ensure strong, reliable, and accurate timber connections under lateral loads.
Half Lap Connection Calculator
Learn how to use the CLT Toolbox Half-lap calculator to model a floor-to-floor diaphragm connection. We start with selecting the CLT layup, supplier, and lap width, and then walk through the difference between discrete and continuous calculation modes. Explore screw supplier options, screw families, and ETA-based optimization.
Spline Connection Calculator
Learn how to design a CLT spline panel-to-panel connection using input forces from diaphragm calculations. Selecting the CLT supplier, spline width, density and material, with an explanation of proper screw selection and availability for setting different screw suppliers, their screw families and screw types. For each group, there is educational content helping to select the right screw product. Easily switch between analytical methods, including the current and new Eurocode 5 approaches.
Spline Connection Calculator
In this video we are walking you trough the Spline Joint Calculator. Design a spline connection between CLT panels with confidence. This tutorial explains how to input diaphragm forces, choose the right spline dimensions, material density, and CLT supplier. You’ll also learn how to select appropriate screws—by supplier, type, and family—using the educational content built into the CLT Toolbox. Easily switch between analytical methods and compare current vs. new Eurocode 5 calculations.
Half - Lap Connection Calculator
Discover how to use the CLT Toolbox Half-Lap Calculator to design diaphragm floor-to-floor connections. Start by selecting the CLT layup, supplier, and lap width, then explore the differences between discrete and continuous calculation options. Dive into screw selection, including suppliers, types, and families, while understanding the workflow behind each choice. Input the appropriate loads and optimize screw design using supplier-specific ETA methods for a precise and efficient connection
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