There are several important preparation steps that you (or your installer) need to do when installing an Interlock Post & Rail Fencing. This article guides you through planning, site assessment, and gathering the right tools and materials for a successful installation.

• Why Preparation Matters
• Tools and Materials Checklist
• Site Assessment and Planning

Why preparation matters

The key to successful Interlock Post & Rail Fencing installation is good planning and preparation, so that you avoid mistakes that could cost both time and money.

Things we’ve seen go wrong include:

• Misaligned posts
• Unstable or uneven rails
• The need for extensive (and expensive) corrections later
• Extra time and labour

One of the most critical steps in the preparation process is taking accurate measurements of the installation area. Exact measurements ensure you order the right amount of fencing materials, and prevent delays.

It’s also important to prepare the site by clearing away debris, ensuring there are no underground utilities that the installation will disturb, and marking post positions. Good planning and site preparation sets the foundation for a stable and long-lasting fence.

Tools and materials checklist

Before you install your Interlock Post & Rail Fencing, you’ll need the right tools and materials on hand to ensure the process runs efficiently and smoothly.

Tools

• Spade: to help with digging and concrete spreading.
• Post hole borer: makes short work of excavating holes of an even size.
• Level: guarantees that everything is plumb.
• Measuring tape: for accurate placement.
• Marking tools: for accurate placement.
• Rubber mallet: to secure interlocking rails without damaging them.

Materials

• Interlock Posts & Rails
• Fence posts
• Concrete mix

Always use quality tools and materials to erect your Interlock Post & Rail Fencing. When it comes to the materials for the fence itself, choose high-quality ones like the timber fencing solutions we provide at Beams & Timber.

Opt for treated timber to resist pests, weathering, and moisture, and always choose timber products that are sustainably sourced here in New Zealand.

Site assessment and planning

A well-planned fence installation begins with a thorough assessment of your property. This step ensures a smooth build and helps prevent unexpected issues.

1. Assessing your property

• Check for slopes. If your land isn’t level, you need to decide whether to follow the natural contours of the land or to keep the top of the fence line level (mostly used for minor or short changes in elevation).
• Confirm legal boundaries and property lines to avoid disputes with neighbours. Check the land survey documents, or consult with your local council if you’re uncertain.
• Before you start digging, check for underground pipes and utilities, such as cables and irrigation systems. Use the online service Before You Dig NZ before excavating any post holes.

2. Considering how many sections will be used for each fence run

• Use full-length rails for as much of the fence run as possible.
• When you get to the last 10–20 metres of a run (or longer, if you prefer), reassess your measurements.
• Work out the exact post centres required for this final stretch.
• Cut all rails except the last section to the calculated lengths based on your adjusted measurements.
• Leave the rails for the final section uncut until you install that section. This gives you flexibility in case your earlier measurements or calculations are slightly off.

3. Clearing and levelling the area

• You want the ground clear of all debris such as old broken fencing, rocks, tree roots, and rubbish.
• If the ground is uneven, fill low spots with soil or dig out high points to create a level base.
• To provide a solid foundation, compact the soil where the posts will be.

Careful preparation ensures a professional and accurate Interlock Post & Rail Fencing installation that’s stable and durable.