Homeowners can easily extend the lifespans of their fence posts by cutting the tops off at angles. This prevents water from pooling and seeping into the wood, which prevents rot, warping, and other moisture-related damage. Read our guide below to learn how to correctly angle-cut fence posts, seal them, and maintain them.
Why Angle-Cutting Fence Posts Is Important
Fence posts that have flat posts are susceptible to water damage. Rain and snow can collect on the flat surfaces, seep into the wood’s end grain, and cause swelling, splitting, and rot.
By cutting the tops of your fence posts at an angle of at least 30 degrees, you create a natural slope that guides water off. This simple modification significantly reduces the amount of moisture that can penetrate the wood, and prevents the damaging effects of water exposure. Your fence posts will be less likely to bow, twist, or rot as a result.
Choosing the Right Wood for Fence Posts
You can make your fence especially durable and long-lasting by choosing the right wood. This can make a significant difference in how well your fence resists damage and decay.
Weather-Resistant Wood Options
Some of the best types of wood for fence posts are below.
- Black locust: Extremely dense and naturally rot-resistant
- Cedar: Resistant to rot and insects
- Pressure-treated pine: Chemically treated to resist moisture and insects
- Redwood: Highly durable and naturally resistant to decay
- White oak: Dense and naturally resistant to decay
Essential Tools for Angle-Cutting Fence Posts
Gather the tools and materials you’ll need before you start installation to make your project run smoothly.
Hand Tools
Hand tools work well for homeowners who have a limited number of posts to cut. Gather the following tools:
- Handsaw: A sharp, sturdy handsaw is the most basic tool for cutting fence posts.
- Measuring tape: Use this to get consistent measurements across all posts.
- Protractor: Use this in conjunction with the sliding bevel square to set precise angles.
- Pencil: Use this to mark cut lines on the posts.
- Sliding bevel square: This adjustable tool helps you to mark accurate angles on your posts.
Power Tools
If you have lots of posts to cut, or need to complete your job quickly, consider the power tools below.
- Circular saw: Ideal for making quick, straight cuts on smaller posts
- Miter saw: Use to achieve precise angled cuts
- Reciprocating saw: Versatile and powerful, but may be less precise than other options
Wear protective gear and follow the manufacturer’s instructions when using power tools.
How To Measure and Mark the Angle for Your Cuts
You can use one of the methods below to measure precise cuts.
Using a Sliding Bevel Square
Using a sliding bevel square is the quickest and easiest way to measure cuts for fence posts. Follow the steps below.
- Set the sliding bevel square to your desired angle using a protractor. Make sure it’s at least 30 degrees.
- Hold the handle of the bevel square firmly against the side of the post.
- Align the blade with the top of the post.
- Draw a line along the blade to mark your cutting line.
- Repeat this process on all sides of the post to keep consistent angles.
This method allows for precise angle measurements that you can easily repeat across all your fence posts.
Alternative Measuring Methods
If you don’t have a sliding bevel square, you can use one of the alternative methods below.
- Angle finder app: Many smartphones have apps that can measure angles. Place your phone against the post and adjust it until you reach the angle you want.
- Cardboard template: Create a cardboard cutout of your desired angle and use it as a guide for marking your posts.
- Carpenter’s square and tape measure: Measure down from the top of the post on one side and make a mark. Use this measurement to create a slope for your desired angle.
These methods may not be as precise as using a sliding bevel square, but they can work in a pinch.
Techniques for Cutting Fence Posts at an Angle
Once you’ve marked your fence posts, you can start making cuts. The tools you have, your skill level, and the number of posts you need to cut will dictate which method you should choose.
Cutting with a Handsaw
Follow the steps below to cut with a handsaw:
- Secure the post firmly to prevent movement during cutting.
- Begin cutting along your marked line, and start at the highest point of the angle.
- Use smooth, even strokes to maintain a consistent cut.
- Check your progress to make sure you’re following the marked line.
- Slow down to avoid splintering the wood as you near the end of the cut.
Using Power Tools for Faster Cuts
Follow the directions below to correctly use power tools to make cuts:
- Chainsaw: Start at the highest point of the angle and carefully guide the chainsaw along the marked line.
- Circular saw: Set the saw’s base plate to the marked angle and carefully guide it along the cutting line.
- Reciprocating saw: Use a long blade and follow the marked line. Keep the saw’s shoe flat against the post.
Best Practices for Achieving Consistent Fence Post Angles
Consistency is key when you’re angle-cutting fence posts. Uniform angles improve the overall appearance of your fence and allow each post to successfully shed water.
Setting Up a Cutting Guide
Follow the steps below to set up a cutting guide, which will help you to maintain consistency across multiple posts:
- Create a template: Use a piece of scrap wood as a guide cut to your desired angle.
- Clamp the template: Secure the template to your workbench or sawhorses.
- Align the post: Place each fence post against the template before you cut.
- Mark and cut: Use the template edge to mark your cutting line, then make your cut.
Tips for Maintaining Accuracy
Follow the steps below to maintain accuracy across each post:
- Use sharp tools: Dull blades can lead to rough, inaccurate cuts.
- Take your time: Rushing can result in mistakes and inconsistent angles.
- Double-check measurements: Verify your angles and marks before making any cuts.
- Practice on scrap wood: If you’re new to angle-cutting, practice on some spare pieces first.
- Clean up between cuts: Remove sawdust and debris so that you can see your cutting lines clearly.
Sealing and Protecting Angled Fence Post Tops
After you cut your fence posts, you’ll need to seal the exposed end grain to prevent moisture absorption.
Applying Wood Preservatives
Wood preservatives protect your fence posts against moisture, UV damage, and insect infestation. Follow the steps below to correctly apply them:
- Choose a preservative: Select a product that’s designed for exterior wood use.
- Clean the cut surface: Remove any sawdust or debris from the angled top.
- Apply the preservative: Use a brush or sprayer to apply an even coat to the cut surface.
- Allow to dry: Allow the preservative to dry according to the manufacturer’s instructions.
- Apply a second coat: Apply a second coat after the first has dried for maximum protection.
Reapply the preservative every few years or as recommended by the product’s manufacturer to protect your posts.
Troubleshooting Common Angle-Cutting Issues
You may encounter some challenges when angle-cutting fence posts. Here are some common issues and how to address them:
Dealing with Uneven Cuts
Follow the steps below if you end up with uneven cuts on your posts:
- Use a rasp or coarse sandpaper to smooth out minor imperfections.
- Consider re-cutting the post if there are larger discrepancies.
- If re-cutting isn’t an option, use wood filler to even out the surface before you seal it.
Remember that small imperfections aren’t very noticeable once you assemble and weather the fence.
Fixing Splintered Edges
Here’s how to fix splintered edges, which can occur when you cut against the grain:
- Sand down any rough or splintered areas using progressively finer grits of sandpaper.
- Apply wood hardener to reinforce weak or damaged areas.
- Fill any remaining gaps or cracks with exterior-grade wood filler.
- Sand the filled areas smooth once they’re dry.
