Why Standard Waste Percentages Can Be Misleading
Many construction projects use a standard waste factor, such as 5-10%, to account for errors, damaged materials, or cutting loss. While this can be a reasonable starting point for some materials, deck tiles often benefit from a more detailed calculation.
The primary reason is the modular nature of deck tiles. Unlike continuous materials like rolls of flooring, deck tiles are discrete units. A small cut needed for an edge might leave a significant portion of a tile as an offcut. If that offcut is large enough and the right shape, it can be used elsewhere in the layout, effectively reducing waste. A simple percentage doesn't always account for this potential reuse, leading to ordering more tiles than necessary.
Understanding Deck Tile Dimensions
Lumber Plus offers deck tiles in two common square formats: 12 x 12 inches and 24 x 24 inches. The choice between these sizes can influence your layout and the number of cuts needed.
The 12 x 12 inch (12" x 12") tile covers 1 square foot per tile. This compact size is often suitable for smaller areas, intricate layouts, or spaces with many edges or transitions. The 24 x 24 inch (24" x 24") tile covers 4 square feet per tile. This larger format is typically chosen for more expansive terraces and open surfaces, resulting in fewer tile seams across the area.
For example, Ipe deck tiles are available in both 12" x 12" and 24" x 24" sizes. Garapa and Cumaru deck tiles are also offered in these standard dimensions.
Always confirm the exact dimensions of the specific deck tile product you intend to use, as manufacturing tolerances can vary slightly.
Planning Your Layout: The Grid Method
The most effective way to calculate cuts and waste is to plan your layout on a grid. This involves drawing your project area to scale and then overlaying the chosen deck tile size.
Begin by accurately measuring the length and width of your project area. Note any fixed obstacles like columns, planters, or drainage points. Transfer these measurements to a scaled drawing or a digital plan. Next, determine the orientation of your tiles. Will they run parallel to the longest edge, or will you create a diagonal pattern? For most projects, a straight grid parallel to the main edges simplifies cutting and maximizes offcut reuse.
Once the grid is established, you can visually place each full tile. Any areas where a full tile does not fit will require a cut. Mark these sections clearly on your plan.
Worked Example: A 10' x 8' Terrace with 24" x 24" Tiles
Let's consider a hypothetical rectangular terrace measuring 10 feet (120 inches) by 8 feet (96 inches). We've chosen 24" x 24" deck tiles.
Along the 10-foot (120-inch) length: 120 inches / 24 inches/tile = 5 full tiles. This edge will require no cuts.
Along the 8-foot (96-inch) width: 96 inches / 24 inches/tile = 4 full tiles. This edge will also require no cuts.
In this ideal scenario, the terrace dimensions are perfect multiples of the tile size. The total number of tiles needed would be 5 tiles * 4 tiles = 20 tiles. There would be no waste due to cutting, assuming all tiles arrive intact and no errors are made during installation.
Now, let's adjust the example. Imagine the terrace is 10 feet (120 inches) by 8 feet 6 inches (102 inches).
Along the 10-foot (120-inch) length: Still 5 full tiles.
Along the 8-foot 6-inch (102-inch) width: 102 inches / 24 inches/tile = 4.25 tiles. This means we need 4 full tiles, and the last row will require cuts of 0.25 of a tile (6 inches) from each tile.
For the 8-foot 6-inch side, we will need 5 rows of tiles (4 full tiles + 1 partial tile). Each of the 5 tiles in that last row will be cut to 6 inches wide. This means we will purchase 5 tiles for that row, making 5 cuts. The remaining 18 inches from each of those 5 tiles (5 x 18" offcuts) are potential reusable offcuts.
Total tiles for the 10' x 8'6" terrace: 5 tiles (length) x 5 tiles (width) = 25 tiles. From these 25 tiles, 5 will be cut, and 5 usable 18-inch offcuts will remain. If you had a 6-inch strip needed elsewhere, you could use an offcut. However, in a simple rectangular layout, these offcuts may not be used, becoming waste. This highlights how a perfect fit reduces waste to zero, while even a small overhang requires cuts across an entire row, generating offcuts that may or may not be reusable.
This example demonstrates that even for a simple rectangle, the exact dimensions relative to the tile size dictate the cutting requirements and the amount of actual waste, which is often more than a simple percentage would suggest.
Maximizing Reusable Offcuts
The key to minimizing waste is to identify and utilize reusable offcuts. After making a cut, if the remaining piece of the tile is large enough and has a clean edge, it can often be used for another section of the layout.
For instance, if you cut a 24" x 24" tile to 12" x 24" for one edge, the remaining 12" x 24" piece can be used elsewhere if a 12" wide section is needed. Keep a clear record on your layout plan of where cuts are made and where the resulting offcuts could potentially fit. This is especially useful for projects with many corners or changes in direction. Plan your cuts strategically to produce offcuts that match other smaller sections of your layout.
Consider cutting tiles in a sequence that allows the larger portion of the offcut to be used immediately. For example, if you need a 6-inch piece and an 18-inch piece, cut the 6-inch piece first, leaving an 18-inch piece for a different section, rather than cutting an 18-inch piece and discarding a 6-inch offcut if it has no further use.
Accounting for Irregularities and Obstacles
Most outdoor spaces are not perfect rectangles. Columns, railings, planters, and drains will all require custom cuts. For these situations, careful measurement and templating are essential.
When encountering an obstacle, measure its dimensions and location precisely. Transfer these to your grid plan. You may need to create a paper or cardboard template of the obstacle's shape to accurately mark the cut lines on your deck tile. For circular obstacles, a compass or flexible ruler can help transfer the curve.
Each custom cut around an obstacle uses a full tile, and the resulting offcuts may be irregular and less likely to be reusable. Factor these into your overall tile count, understanding that these specific cuts will likely contribute more to non-reusable waste than straight edge cuts.
Before you order
- Have I accurately measured the entire project area, including all lengths and widths?
- Have I identified all fixed obstacles (columns, drains, planters) and measured their positions and dimensions?
- Have I chosen the specific deck tile size (e.g., 12" x 12" or 24" x 24")?
- Have I drawn a scaled grid plan of my project area with tile placement?
- Have I marked all necessary cuts for edges and obstacles on my plan?
- Have I identified potential reusable offcuts and noted where they could be used?
- Have I accounted for any expansion gaps or spacing requirements specified by the manufacturer?
- Does my final tile count reflect full tiles purchased, even if only a portion is used?
Confirm installation details, approved uses and warranty terms in the current instructions for the exact product and profile. Your installer should verify the substrate, structure and applicable project requirements.
Questions to help you decide
Can I use smaller deck tiles to reduce waste?
Using smaller deck tiles, such as 12" x 12" modules, can sometimes lead to less waste in irregularly shaped areas or around many obstacles. The smaller module size means that offcuts, even if not fully reusable, represent a smaller fraction of the original tile. However, this also means more tiles need to be purchased overall for the same area, and installation time might increase due to more individual pieces.
What tools do I need for cutting deck tiles?
The specific tools depend on the material of your deck tiles. For hardwood deck tiles, a miter saw or circular saw with a suitable blade is typically used for straight cuts. A jigsaw can be useful for intricate curves or cut-outs around obstacles. Always use appropriate safety gear, including eye protection and hearing protection, and follow the tool manufacturer's instructions.
Should I add extra tiles for contingency?
After performing a detailed cut and waste calculation, you might still consider adding a small buffer, perhaps 1-2 extra tiles, beyond your calculated total. This can account for unforeseen errors, future repairs, or slight material imperfections. This small contingency is different from a general waste percentage and is a safeguard for specific project needs.
Ready to Plan Your Deck Tile Project?
Request a material quote with your project dimensions, desired deck tile profile, and ZIP code. We can help confirm current availability and service options for your chosen deck tiles.
Request a material quote →