How to Calculate How Much Decking You Need?
A beautiful and functional deck significantly enhances the quality of outdoor living. Accurately calculating the required materials is the first step to a successful project. To determine the number of deck boards needed, first calculate the total area of the deck. Then divide this by the area of a single board to get the base number of boards. Finally, add 10-15% for waste and cutting to arrive at the total number of boards required.
Additionally, variations in board spacing must be accounted for during calculations. For instance, composite wood decking and wooden decking have different spacing requirements. This guide will walk you through each step of figuring out how much decking you need, so you can get an accurate answer.
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Table of Contents
Why is It Crucial to Accurately Calculate Deck Material Quantities?
Deck material calculations require comprehensive consideration of multiple factors. Precise calculations offer the following benefits:
- Cost Control: Deck materials represent a major project expense. Over-ordering leads to financial waste. Under-ordering delays schedules, incurring additional transportation and time costs.
- Material Consistency: Different batches of decking materials may have slight changes in color or texture. Ordering sufficient quantities from the same batch ensures a uniform deck appearance.
- Project Planning: Having accurate numbers for the amounts of materials needed makes it easier to plan the schedule for construction work, budgeting, and staffing.
- Waste Reduction: Precise calculations minimize material waste, aligning with sustainable construction principles.
Deck Laying Fundamentals
Before beginning calculations, you need to understand some basic knowledge about decking.
Factors Affecting Deck Material Quantity
To accurately calculate required deck boards, consider these influencing factors:
- Deck shape
- Deck dimensions
- Board dimensions
- Laying direction
- Board spacing requirements
- Cutting waste and construction tolerances
- Additional structures like stairs and railings
Common Deck Board Dimensions
The sizes of the deck boards are also very important for accurate estimates. The usual widths for deck boards are 5.5 inches and 3.5 inches. You can choose from standard lengths of 8, 10, 12, 16, and 20 feet. Using the right measurements in calculations is important for getting accurate results.
Deck Board Layout Directions
The direction of board placement impacts both material calculations and aesthetic appeal. Common layouts include:
- Straight Layout: The simplest and most common method. This approach maximizes material efficiency and simplifies calculations.
- Diagonal Layout: Diagonal installation creates a more dynamic visual effect. However, it may require more cutting and precise calculations. Material usage typically increases by approximately 15-20%.
- Complex Pattern Layout: Some intricate patterns offer enhanced aesthetic appeal. However, material waste can reach 30-40%. For construction, it is advisable to engage a professional contractor.
Learn More: 9 Deck Patterns To Make a Style Statement
Preparation and Basic Measurements
Once you have gathered the above basic information, you can proceed to measure your deck.
Measuring Tools
Accurate measurements form the foundation of calculations. Prepare the following tools:
- 25-foot or longer tape measure
- Laser rangefinder
- Calculator
- Graph paper or drafting software
Determining Deck Design
Before measurement, a deck design plan must be established. Clarify the following:
- Deck Shape: Rectangular shapes are the simplest for calculations. However, modern deck designs often incorporate L-shapes, U-shapes, polygons, or irregular forms.
- Define Boundaries: Determine the deck’s perimeter, including any recessed, protruding, or curved sections.
- Consider Multi-Level Structures: If the design calls for more than one level of decking, you should measure each level individually.
- Include Staircases: Planned staircases should be measured and calculated as separate sections.
Precision Measurement Techniques
First, measure the length of the longest side of a rectangle or square deck. Then, measure the width across from the length. Save measures that are accurate to 1/4 inch.
If you have an irregular shape, break it up into several standard geometric shapes. Take different measurements of each section. Find the area of each part and add them up. Lastly, sketch the layout and mark each size.
To figure out stairs, you need to do the following:
- Measure the depth of each tread.
- Measure the width of each tread.
- Calculate the area of a single tread: Depth × Width.
- Multiply by the number of treads to obtain the total stair area.
Calculation Steps
After measuring the above data, you can begin your calculations. Consider the following aspects during computation:
Calculate Total Deck Area
To find the area of a simple rectangular deck, multiply the length by the width. Let’s say the deck is 16 feet long and 12 feet wide. The deck size is 16 x 12 = 192 square feet. If your deck has a complicated shape, break it up into easy geometric shapes. Find the area of each form on its own, and then add them all up.
Selecting Sheets and Calculating Single Sheet Area
Consider the following factors when selecting sheets:
- Minimize Seams: Use longer sheets to reduce end-to-end joints.
- Reduce Waste: Choose sheet lengths matching deck dimensions.
- Structural Considerations: Ensure sheet support meets manufacturer specifications.
- Aesthetic Factors: Evaluate how seam layout affects overall appearance.
The formula for single sheet area is: Sheet Length × Actual Sheet Width = Single Sheet Area. Note: Use actual width, not nominal width. Example: Board length is 16 feet. Actual board width is 5.5 inches. First convert board width to feet: 5.5 ÷ 12 = 0.4583 feet. Calculate single board area: 16 × 0.4583 = 7.33 square feet.
Calculating Base Board Quantity
To find out how many deck boards you need, divide the total deck area by the area of a single board. This gives you the baseboard number. To give you an idea, if the deck is 192 square feet and a single board is 7.33 square feet, then the number of base boards is 192 ÷ 7.33 = 26.19 boards.
Considering the Impact of Board Spacing
Board space is very important for a deck. Manufacturers require certain gaps between boards, whether wood or composite deck materials. The main reasons are:
- Drainage: Allows water to flow through gaps.
- Expansion: Provides space for thermal expansion and contraction.
- Ventilation: Promotes airflow to prevent mold growth.
- Aesthetics: Creating visually pleasing lines.
Spacing requirements vary by material. Strictly follow the specific instructions provided by the decking manufacturer. The spacing area is calculated as follows:
- Determine the Number of Gaps: Total gaps = Number of decking boards minus 1.
- Calculate Total Gap Width: Total gap width = Number of gaps × Gap width.
- Calculate Gap Area: Total gap width × Deck board length.
You could also record the boards’ actual width, which is easier. For instance, if a deck board is 5.5 inches wide and the space between them is 0.125 inches, then each board takes up a total of 5.625 inches of space.
Calculating Waste and Additional Materials
Besides the things you need to build the deck, you should also bring extras in case something goes wrong. Cutting scraps, bad materials, and mistakes during installation are the main causes of waste in deck building. You should also keep extra materials on hand in case you need to replace them in the future.
For a simple rectangular deck, you should set aside 5 to 10 percent of the decking boards to be thrown away. Allow 10 to 15 percent more for L-shaped or rectangular decks. Allow 15 to 30 percent more material for diagonal shapes or other complicated patterns.
Calculating Other Deck Materials
Beyond decking boards, you must also calculate quantities for other accessories. For example:
- Fasteners: Quantity is based on how many boards there are, how big they are, and how they are attached.
- Edge Boards: Edge boards cover board ends to protect them from environmental exposure. Quantity relates to the deck perimeter.
- Joists: Joist requirements depend on deck size and joist spacing. Calculation formula: Joist quantity = (Deck length ÷ Joist spacing) + 1.
- Beams and Posts: Beams and posts must be determined based on deck height and local building codes.
Conclusion
Calculating deck requirements is a systematic process. Accurate measurements and design considerations are essential. Select decking materials based on design, budget, and performance needs. Factor in spacing, material waste, and special design requirements. For multi-level decks or complex designs, professional planning is recommended. Contact EVODEK for assistance. We provide high-quality composite decking and answer your questions.
FAQ
What Deck Board Length Should I Choose?
Board length selection depends on several factors:
- Reduced Seams: Using longer boards reduces the number of end-to-end joints, which makes the job look better and lowers the risk of water leaks.
- Minimized Waste: Select lengths that best match your deck dimensions.
- Transportation and Handling: Using longer boards reduces the number of end-to-end joints, which makes the job look better and lowers the risk of water leaks.
- Structural Support: Ensure board spans do not exceed manufacturer recommendations.
How Do Composite and Wood Decking Differ in Calculations?
Key distinctions include:
- Different Spacing Requirements: Solid wood and composite decking exhibit varying thermal expansion/contraction. Thus, spacing requirements differ between products.
- Dimensional Stability: Composite decks are more consistent in their dimensions, which makes them easier to calculate. Wood may vary in size more, so it needs bigger adjustments.
- Waste Rate Differences: There may be more flaws in wood decking, so there needs to be a higher waste limit. Composite decking materials are more consistent, which means they usually need a slightly lower loss rate.
What Factors Should be Considered When Calculating for Sloped Decks?
Sloped decks require special considerations:
- Measure Horizontal Distance: Measure the horizontal projection distance, not along the slope.
- Account for Step Changes: If the slope is significant, a stepped deck design may be necessary.
- Safety Considerations: Ensure slope compliance with local building codes. Incorporate anti-slip treatments, especially in humid regions.
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