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Can You Use Softwood for Bench Slats?

Published in Outdoor Furniture Materials 3 mins read

Yes, you can absolutely use softwood for bench slats, particularly when it has been appropriately treated to enhance its durability and resistance to outdoor elements.

Softwood is a common and practical choice for outdoor furniture components like bench slats due to its availability and the ease with which it can be processed and treated.

Why Choose Treated Softwood for Bench Slats?

While raw softwood might not be the most resilient material for outdoor exposure, pressure-treated softwood is specifically engineered to withstand harsh weather conditions, rot, and insect infestation. This treatment significantly extends the lifespan of the wood, making it a viable and often more economical alternative to hardwoods.

Many suppliers offer a wide range of replacement softwood bench slats, often supplied fully machined with a smooth radius on all edges, designed for easy installation and comfort. These slats are available in various widths, thicknesses, and common lengths, such as 1.800m (6ft), to fit standard bench frames.

Benefits of Pressure-Treated Softwood:

  • Cost-Effective: Generally more affordable than hardwoods, making it a budget-friendly option for repairs or new constructions.
  • Availability: Widely available from timber merchants and hardware stores.
  • Workability: Easier to cut, drill, and shape compared to dense hardwoods, simplifying installation and customisation.
  • Durability (when treated): Pressure treatment infuses the wood with preservatives, protecting it from:
    • Moisture and rot
    • Fungal decay
    • Insect attacks (e.g., termites)
  • Sustainability: Many softwoods are sourced from sustainably managed forests, offering an environmentally conscious choice.

Common Softwoods Used

Typically, softwoods like pine, spruce, or fir are used for bench slats. When intended for outdoor use, these are almost always pressure-treated. The treatment process gives the wood a distinctive green or brownish tint, which can weather to a silvery-grey over time or be stained/painted for a desired finish.

Considerations for Softwood Slats:

  1. Pressure Treatment: Always opt for pressure-treated softwood for outdoor bench slats. Untreated softwood will quickly succumb to rot and decay when exposed to the elements.
  2. Maintenance: While treated, regular cleaning and occasional application of a water-repellent sealer or stain can further extend the life and maintain the aesthetic appeal of the slats.
  3. Finish: Ensure the slats are smooth and free of splinters. Many manufactured slats come fully machined with rounded edges for comfort and safety.
  4. Dimensions: Confirm the dimensions (width, thickness, length) match your bench frame to ensure a proper fit.

Treated Softwood vs. Untreated Softwood for Bench Slats

Feature Pressure-Treated Softwood Untreated Softwood
Outdoor Suitability Excellent (resists rot, insects, moisture) Poor (will rot and decay quickly)
Lifespan Long (10-15+ years with maintenance) Short (1-3 years without protection)
Cost Moderate Low (but not practical for outdoors)
Maintenance Low to moderate (occasional sealing) High (requires constant protection)
Appearance Green/brownish tint, weathers to grey Natural wood color, darkens with age
Common Use Decking, fences, outdoor furniture, benches Indoor furniture, structural framing

By choosing pressure-treated softwood, you can create durable, comfortable, and attractive bench slats that will withstand the test of time and weather.