TimberTech Calculator
Estimate materials and costs for your composite decking project.
The total width of the deck area.
The total length of the deck area, parallel to the joists.
Standard TimberTech boards are 5.5 inches wide.
The length of the individual boards you will purchase.
Distance between the center of your deck joists.
The price for a single decking board of your chosen length.
Total Estimated Material Cost
Cost Breakdown
Chart shows estimated cost distribution. Joist and fastener costs are illustrative.
What is a TimberTech Calculator?
A TimberTech calculator is a specialized tool designed to help homeowners, DIY enthusiasts, and professional contractors accurately estimate the materials required for building a composite deck using TimberTech products. Unlike a generic construction calculator, this tool is tailored to the specific dimensions and components of TimberTech decking, providing a much more precise material list. It helps you figure out exactly how much composite decking you need, reducing waste and preventing budget overruns.
The primary purpose of this calculator is to translate your deck’s dimensions (width and length) into a concrete list of materials. This includes the total number of decking boards, the required fasteners for installation, and an estimate of the underlying support joists needed. By using a dedicated timbertech calculator, you can plan your project with confidence, knowing your material estimates are based on real-world product specifications and installation standards.
TimberTech Decking Formula and Explanation
The calculations for estimating your decking materials involve several steps, from finding the total area to determining board and joist counts. The core formulas used by this timbertech calculator are explained below.
1. Deck Area: The most basic measurement, calculated by multiplying the deck’s width by its length.
Deck Area = Deck Width × Deck Length
2. Number of Board Rows: This determines how many boards you’ll need side-by-side. It’s calculated by dividing the total width of the deck by the width of a single board plus the standard gap between boards (typically 0.1875 inches).
Board Rows = Deck Width / (Board Width + Gap)
3. Total Boards Needed: This is found by first calculating the total linear footage of decking required and then dividing by the length of the boards you plan to purchase. A waste factor is added to account for cuts and mistakes.
Total Boards = (Board Rows * Deck Length) / (Purchase Board Length) * (1 + Waste Factor)
| Variable | Meaning | Unit (Typical) | Typical Range |
|---|---|---|---|
| Deck Width | The measurement across the boards (perpendicular to board run). | Feet / Meters | 5 – 50 |
| Deck Length | The measurement along the boards (parallel to board run). | Feet / Meters | 5 – 100 |
| Board Width | The actual width of a single TimberTech board. | Inches / Millimeters | 5.5″ or 7.25″ |
| Joist Spacing | The on-center distance between support joists. | Inches | 12″, 16″, 24″ |
| Waste Factor | An added percentage to account for cuts, errors, and unusable pieces. | Percentage (%) | 5% – 15% |
Practical Examples
Understanding the inputs can be easier with a practical example. Here are a couple of common scenarios for using the timbertech calculator.
Example 1: Standard Rectangular Deck
Imagine you’re building a standard backyard deck for a grill and patio set.
- Inputs:
- Deck Width: 12 ft
- Deck Length: 16 ft
- Board Type: 5.5″ Standard
- Board Purchase Length: 16 ft
- Joist Spacing: 16 in
- Results:
- Total Area: 192 sq ft
- Total Boards Needed: Approx. 27 (16-foot boards)
- Hidden Fasteners: Approx. 324
- Framing Joists: Approx. 13
This shows that for a common deck size, you can quickly get a material list. You might also want to consult a composite decking cost guide for further budgeting.
Example 2: Large Metric Deck
Let’s consider a larger, poolside deck measured in metric units.
- Inputs:
- Deck Width: 5 m
- Deck Length: 10 m
- Board Type: 5.5″ Standard (140mm)
- Board Purchase Length: 16 ft (approx 4.88m)
- Joist Spacing: 16 in (40cm)
- Results:
- Total Area: 50 sq m
- Total Boards Needed: Approx. 37 (16-foot boards)
- Hidden Fasteners: Approx. 925
- Framing Joists: Approx. 26
How to Use This TimberTech Calculator
Using this calculator is a straightforward process. Follow these steps to get an accurate estimate for your project.
- Select Your Unit System: Start by choosing between Imperial (feet/inches) or Metric (meters/cm). All labels will update automatically.
- Enter Deck Dimensions: Input the total Width and Length of your planned deck. Ensure you measure from the furthest points.
- Choose Board Specifications: Select the width of the TimberTech boards you plan to use and the length you intend to purchase them in. Buying longer boards can sometimes reduce waste.
- Set Joist Spacing: Select the distance between your deck’s support joists. 16 inches is the most common standard for residential decks.
- Input Cost: Enter the cost for a single board of the purchase length you selected. This is crucial for an accurate cost estimation.
- Review Your Results: The calculator will instantly update with the total cost, number of boards needed, fasteners, and joists. The “Copy Results” button allows you to save this information. Check out deck design ideas to visualize your project.
Key Factors That Affect Decking Needs
While this timbertech calculator provides a strong estimate, several factors can influence your final material count.
- Deck Complexity: Irregular shapes, curves, and multiple levels require more cuts and typically increase the waste factor. This calculator is best for rectangular shapes.
- Board Orientation: A diagonal (45°) decking pattern can increase material needs by 15% or more due to the angle cuts on every board. Consider our deck material estimator for more complex layouts.
- Picture Framing: Adding a border of one or more boards around the perimeter (a “picture frame”) requires additional material and different cutting calculations.
- Stairs: Deck stairs require their own specific calculations for treads, risers, and stringers, which are not included in this main surface calculator.
- Waste Factor: All projects generate some waste. A standard 10% waste factor is a good starting point, but complex designs may need 15-20%.
- Joist Span Rating: Always ensure your joist spacing is compliant with TimberTech’s installation guidelines for the specific product line you choose to ensure safety and warranty coverage. A deck safety checklist is a valuable resource.
Frequently Asked Questions (FAQ)
1. How accurate is this TimberTech calculator?
This calculator provides a highly accurate estimate for square or rectangular decks with a standard layout. It includes a 10% waste factor, which is suitable for most projects. However, for highly complex designs, you should order slightly more material.
2. Does this calculator account for the gap between boards?
Yes, it automatically includes a standard 3/16″ (approx 4.7mm) gap between boards in its calculation for the number of boards needed, ensuring a realistic count.
3. What is not included in the calculation?
This calculator primarily estimates surface decking, fasteners, and joists. It does not include materials for stairs, railings, fascia boards, or structural posts and beams. For those, you may need a more comprehensive deck building calculator.
4. How much waste should I plan for?
A 10% waste factor is automatically included and is sufficient for most simple decks. If your design is complex (e.g., diagonal patterns, lots of angles), consider increasing your order by 15-20%.
5. Can I use this for different brands of composite decking?
Yes, as long as the board widths are similar (e.g., a standard 5.5-inch composite board). However, for the most accurate composite decking cost, it’s best to use calculators designed for a specific brand when possible.
6. Why is joist spacing important?
Joist spacing is critical for structural support. Composite decking requires specific spacing (usually 16″ or less) to prevent sagging and ensure safety. Always follow the manufacturer’s guidelines.
7. What if my deck is not a simple rectangle?
For L-shaped or T-shaped decks, the best approach is to break the deck into smaller rectangular sections. Calculate each section separately using the timbertech calculator and add the results together.
8. How are fasteners calculated?
Fasteners are estimated based on the number of board rows and the number of joists they will cross. The calculation assumes one hidden fastener at every intersection, providing a reliable estimate for systems like CONCEALoc.