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Deck Quantity Calculator

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  • Since pressure-treated wood shrinks and composite wood expands, you must ensure a construction gap (joint] of approximately 5mm according to the material characteristics to prevent defects such as the deck sagging or warping in the summer.
  • The spacing of the lower joists must be maintained at 300mm or less for 20T decking and 400mm or less for 25T decking, based on the thickness of the decking material, to prevent accidents such as the deck swaying or breaking while walking.
  • At the butt joints where deck boards connect, two rows of square tubing (double joists] must be installed so that each end is supported by a separate joist to prevent long-term damage and corrosion.
  • Ordering materials with a margin of about 10 to 15 percent above the calculated result, taking into account cutting losses and scraps caused by site conditions, is the standard practice for efficient site management without construction interruptions.
  • When installing composite wood, a minimum gap of at least 10mm must be maintained at points where it meets the wall, and the clip-type or screw-type fixing method suitable for the material's characteristics must be accurately selected and used during installation.

How about this calculator?

Deck Material Calculator, Complete Guide to Pressure-Pressure, Composite, and Natural Wood Quantities

The most important factor in estimating the construction of a terrace or yard deck is accurate material calculation. By considering not only the construction area but also the gaps between materials and the cutting loss rate, we calculate the precise quantity of decking material (sheets] and total length required on-site.

Deck Material Requirements Calculation Formula

To determine the exact quantity, the calculation is based on the effective width, which is the sum of the material width and the construction spacing.

Total extension length
Total length (m] = Construction area (㎡] ÷ (Material width + Construction interval]
Final required quantity
Quantity (sheets] = (Total length ÷ Length of one sheet] × (1 + Markup rate / 100]

Calculation based on effective width, which reflects site conditions, is much more accurate than quantity based on simple area.

Detailed Guide to Calculator Input Items

Please input the material characteristics and site conditions for accurate results.

1. Selecting Decking Material Type

Please select the material you intend to use (composite wood, pressure-treated wood, natural wood, etc.]. Since shrinkage and expansion characteristics vary depending on the type, the installation spacing settings will differ.

2. Construction Area and Material Specifications

Enter the width and length of the floor to be installed. The width of the material (e.g., 120mm, 140mm] is the factor that has the greatest impact on the quantity calculation.

3. Construction Gap and Markup Rate

Enter the gap (joint] between materials. Considering the scraps discarded during cutting, it is recommended to apply a markup rate of 5–10% for simple shapes and 10–15% for complex shapes.

Comparison of Features by Deck Material

division treated wood synthetic wood natural wood
characteristic Excellent value for money No maintenance required Premium texture and strength
disadvantage Periodic painting required High initial costs High price and difficulty
Recommended interval 2~3mm (shrinkage] 5~8mm (expansion] Varies by tree species
note.

Since pressure-treated wood shrinks as it dries and composite wood expands due to heat, it is essential to install them at intervals appropriate to the characteristics of the materials.

Essential Checklist for Fail-Free Construction

This is the core principle of substructure construction that determines the lifespan of the deck.

  • Observe joist spacing

    Depending on the thickness of the decking material, a joist spacing of 300mm or less for 20T and 400mm or less for 25T is recommended. If the spacing is too wide, the deck may sway.

  • Double Joist Installation

    At the butt joints where deck boards connect, two rows of square tubing must be installed so that each end is supported by separate joists to prevent damage and corrosion.

  • Contraction and expansion free space

    In particular, since composite wood stretches in the longitudinal direction, it must be installed with a gap of at least 10mm where it meets the wall to prevent bulging.

Frequently Asked Questions (FAQ]

  • Q. Which is better, the clip type or the piece type?
  • A. Clip-type screws are neat and safe as they leave no screw marks, but they are more expensive. Screw-type screws offer secure fastening and are easy to maintain, but visible screw marks remain.
  • Q. Is it mandatory to maintain a gap (spacing] between the deck boards?
  • A. Yes, the key is to ensure a gap of approximately 5mm to account for smooth drainage and ventilation, as well as the shrinkage and expansion of the wood. This small difference is the expert's secret to preventing deck warping and extending its lifespan by more than double.
  • Q. What is the difference between hollow and solid types?
  • A. The hollow type has holes, making it lightweight, inexpensive, and suitable for general pedestrian use. The solid type is solid, making it resistant to impact, and is recommended for areas with high foot traffic.