Building treated pine garden edging is one of the most rewarding DIY projects for transforming an unruly yard into a structured, visually appealing space. This guide walks you through the entire process, from selecting the right materials to the final finishing touches. The goal is to create a durable, attractive border that defines your garden beds and lawn areas for years to come.
When planning your project, the first critical decision is the type of pine timber you use. For garden edging, pressure-treated pine is the standard choice due to its resistance to rot and insect damage. However, you will need to decide between ground contact-rated and above-ground-rated timber. While above-ground options are more affordable, investing in ground contact timber significantly extends the lifespan of your edging, especially in moist soil conditions.
Planning and Layout
Measuring Your Garden Beds
Before purchasing a single piece of wood, you must map out your design. Use a measuring tape to determine the perimeter of each garden bed you wish to edge. For complex shapes, divide the area into manageable straight sections and measure each individually. Adding an extra 10% to your total length calculation is wise, as it accounts for cutting errors and waste during installation.
Marking the Territory
Once measurements are taken, it’s time to visualize the placement. Lay a garden hose or use spray paint to trace the outline of your edging on the ground. This visual guide is invaluable for adjusting curves and ensuring straight lines are truly straight. It also helps you confirm that the edging will complement your existing landscape features, such as pathways or patios.
Material Selection and Tools
Choosing the Right Timber
Standard dimensions for garden edging are typically 100mm x 50mm or 150mm x 50mm. The larger size offers more rigidity and a bolder aesthetic, making it ideal for taller edging, while the smaller size is more discreet and easier to handle. Regardless of size, ensure the wood is kiln-dried to minimize warping and twisting after installation.
Essential Tools for the Job
Gather your tools before starting to ensure a smooth workflow. You will need a sturdy tape measure, a claw hammer or mallet, a rubber mallet for gentle placement, a handsaw or circular saw, a level, a garden hose or spray paint, a spade or trenching shovel, and landscaping fabric or geotextile if you plan to install a weed barrier.
Installation Process
Preparing the Trench
Clear the marked area of grass and debris. Using a spade, dig a trench approximately 5 to 7.5 cm (2 to 3 inches) deep and wide enough to accommodate the width of your timber. A slight slope at the bottom of the trench facing inward helps with water drainage, preventing the wood from sitting in pooled water.
Laying the First Course
Place the first piece of treated pine into the trench. Check for levelness both horizontally and vertically using a spirit level. Gently tap the board into place with a rubber mallet. Ensuring the first piece is perfectly positioned is crucial, as subsequent pieces will align with it. Stagger the joints of adjacent boards to create a stronger, more stable structure rather than having them sit flush in a straight line.
Securing and Finishing
Joinery Techniques
For a clean, professional look, avoid simple butt joints that can separate over time. If you are comfortable with basic tools, consider creating a lap joint by overlapping the ends of the boards by half their thickness. Alternatively, you can use galvanized steel stakes or deadmen (angled stakes driven into the ground behind the edging) to hold the structure firmly in place without visible fasteners on the top surface.
Weathering and Maintenance
Once installed, you have two options for finishing the wood. You can leave the pine to weather naturally, which will turn it to a silvery-grey patina over a few years. Or, you can apply a water-repellent preservative or a stain to enhance the wood grain and prolong its original color. Applying the finish before installation allows for better penetration, protecting the wood from the ground moisture.
