How To Cut Metal Lath – The Jim Boslice Guide To Safe & Smooth Cuts
To cut metal lath safely and effectively, your best tools are aviation snips for precision work or an angle grinder with a metal cutting wheel for faster, longer cuts. Always wear heavy-duty gloves, safety glasses, and long sleeves to protect against sharp edges and sparks. Mark your cut lines clearly and secure the lath before cutting to ensure accuracy and prevent movement.
Ever tackled a plaster or stucco project, only to find yourself staring down a roll of metal lath, wondering how to get those clean, precise cuts you need? You’re not alone. Many DIY builders and woodworkers find themselves scratching their heads when it comes to taming this surprisingly tough material. It’s sharp, it’s rigid, and it can feel a bit intimidating.
But don’t fret! At The Jim BoSlice Workshop, we believe every challenge is just an opportunity to learn a new skill. In this comprehensive guide, we’re going to demystify the process of how to cut metal lath, transforming it from a tricky task into a manageable step in your project.
We’ll walk you through everything from choosing the right tools and prioritizing safety to mastering the cutting techniques for both intricate shapes and long, straight lines. By the end of this article, you’ll have all the expert insights and practical advice needed to cut metal lath like a seasoned pro, ensuring your next project looks fantastic and stands the test of time. Let’s get cutting!
Understanding Metal Lath: Why Accurate Cuts Matter
Before we dive into how to cut metal lath, let’s quickly touch on what it is and why getting your cuts right is so important. Metal lath is essentially a sheet of expanded metal mesh, often galvanized steel, used as a base for plaster, stucco, or even some tile applications. It provides a crucial mechanical bond, giving the finish material something to grip onto, preventing cracks and ensuring durability.
Think of it as the skeleton for your wall or ceiling finish. If the skeleton isn’t properly shaped and fitted, the whole structure suffers. Precise cuts ensure a snug fit around windows, doors, and corners, minimizing waste and creating a seamless surface for your finishing material. Crooked or poorly cut lath can lead to weak points, unsightly bulges, or even structural failures in your plaster or stucco down the line.
The benefits of how to cut metal lath accurately extend to the longevity and aesthetic appeal of your entire project. It’s a foundational step that sets the stage for success.
Safety First: Essential Gear for Cutting Metal Lath
When working with metal lath, safety isn’t just a suggestion; it’s a non-negotiable rule. The edges of metal lath are incredibly sharp, almost razor-like, and can cause nasty cuts in an instant. Sparks from power tools also pose a significant risk. Prioritizing safety will keep your workshop experience positive and injury-free.
Here’s your essential safety checklist before you even think about making a cut:
- Heavy-Duty Gloves: This is your first line of defense. Opt for thick, cut-resistant gloves, preferably leather, to protect your hands from sharp edges.
- Safety Glasses or Goggles: Metal shards, dust, and sparks can fly, especially when using power tools. Always wear ANSI-approved eye protection to prevent serious injury.
- Long-Sleeved Shirt and Pants: Protect your arms and legs from scrapes and cuts. Denim or other durable fabrics are ideal.
- Hearing Protection: An angle grinder can be quite loud. Earplugs or earmuffs are essential to protect your hearing from long-term damage.
- Dust Mask/Respirator: Cutting metal can create fine dust, especially when using a grinder. A good quality dust mask or respirator will protect your lungs.
- Work Boots: Protect your feet from falling tools or sharp pieces of lath.
- Clear Workspace: Ensure your cutting area is free of clutter. This prevents tripping hazards and gives you ample room to maneuver.
Remember, a moment of carelessness can lead to a lasting injury. Always double-check your safety gear before you begin.
Choosing Your Tools: The Right Way to Cut Metal Lath
The key to mastering how to cut metal lath effectively lies in selecting the right tool for the job. There isn’t a single “best” tool; it depends on the size of the lath, the type of cut you need, and your comfort level with power tools. Let’s explore the most common and effective options.
Aviation Snips (Tin Snips)
For precision work, intricate shapes, or smaller pieces of lath, aviation snips are your best friend. They’re like heavy-duty scissors designed specifically for cutting sheet metal. They come in three main types, easily identified by their handle color:
- Red Handle: Cuts left (curved cuts to the left).
- Green Handle: Cuts right (curved cuts to the right).
- Yellow Handle: Cuts straight.
For general use, a pair of yellow-handled straight-cut snips will get you far, but having a red or green pair can be invaluable for curved cuts. Aviation snips offer excellent control and produce relatively clean edges, making them ideal for fitting lath around obstacles.
Angle Grinder with a Metal Cutting Wheel
When you need to make long, straight cuts quickly, or tackle thicker gauge lath, an angle grinder is the tool of choice. It’s powerful and efficient, but it also demands extra caution due to sparks and kickback potential.
- Cutting Wheel: Ensure you use a thin abrasive metal cutting (cutoff) wheel, not a grinding wheel. These wheels are designed to slice through metal efficiently.
- Safety: As mentioned, an angle grinder generates significant sparks and can be loud. Full PPE, including hearing and eye protection, is absolutely critical.
Other Potential Tools
- Utility Shears: For very light gauge lath, heavy-duty utility shears might work, but they often struggle with the expanded mesh structure and can quickly dull.
- Reciprocating Saw with Metal Blade: While less common for lath, a reciprocating saw equipped with a fine-tooth metal-cutting blade can be effective for longer cuts, especially if you have a stable way to secure the lath. It’s often more cumbersome than an angle grinder for this specific task.
When considering how to cut metal lath best practices, tool selection is paramount. Choose the tool that matches the task, and always ensure it’s in good working order before you begin.
Step-by-Step: Mastering How to Cut Metal Lath
Now that you’re geared up and have your tools ready, let’s get into the practical application of how to cut metal lath. We’ll break it down by tool, focusing on technique and precision.
Cutting with Aviation Snips
This method offers the most control and is excellent for intricate work or smaller pieces.
- Measure and Mark: Lay your metal lath flat on a stable surface. Use a tape measure and a permanent marker (or a scratch awl for clearer lines) to mark your cut line. For straight cuts, use a straightedge to draw a clear line.
- Secure the Lath: If possible, clamp the lath to your workbench. This prevents it from shifting and makes your cuts more accurate and safer.
- Position Your Snips: Open the snips wide. Start your cut at the edge of the lath, aligning the blades with your marked line.
- Make the Cut: Apply firm, even pressure. Don’t try to cut through too much material at once. Take small “bites” with the snips, working your way along the line. Keep the blades perpendicular to the lath.
- Mind the Waste Side: For straight cuts, keep the bulk of the waste material on the side of the snips that curls the metal away from your cut line. This helps keep your primary piece flat and minimizes distortion.
- Clean Up: After cutting, inspect the edge. You might have small burrs or sharp points. Use a file or even a spare piece of wood to knock off any particularly nasty bits.
These how to cut metal lath tips for snips emphasize control and a steady hand for the cleanest results.
Cutting with an Angle Grinder
For longer, faster cuts, an angle grinder is highly efficient, but requires a more robust safety approach.
- Set Up Your Workspace: Choose an outdoor area or a well-ventilated space, away from flammable materials. Sparks will fly! Lay down a fire-resistant tarp or board underneath your cutting area.
- Install the Right Wheel: Ensure your angle grinder has a thin metal cutting (cutoff) wheel securely installed. Double-check the wheel’s RPM rating against your grinder’s maximum RPM.
- Measure and Mark: Just like with snips, accurately mark your cut line on the lath. A chalk line or a strong marker works well.
- Secure the Lath: This is crucial. Clamp the metal lath firmly to a stable workbench or sawhorse. The lath must not move during the cut. Consider placing a sacrificial board underneath the lath to protect your work surface.
- Don Your PPE: Reiterate full safety gear: gloves, safety glasses, hearing protection, long sleeves, and a dust mask.
- Position the Grinder: Hold the grinder firmly with both hands. Let the grinder reach full speed before touching the wheel to the lath.
- Make the Cut: Guide the spinning wheel along your marked line. Apply gentle, consistent pressure. Let the tool do the work. Do not force it. Move slowly and steadily. The sparks will be significant, so be prepared.
- Keep it Straight: For long cuts, use a clamp-on straightedge or a fence as a guide for the grinder. This will help you achieve perfectly straight lines.
- Allow to Cool & Inspect: The cut edges will be very hot. Allow the lath to cool before handling. Inspect for burrs and file them down if necessary.
Using an angle grinder is one of the most effective ways to follow a comprehensive how to cut metal lath guide for speed and efficiency, but never compromise on safety.
Common Problems and Smart Solutions When Cutting Metal Lath
Even with the right tools and techniques, you might encounter a few hiccups when learning how to cut metal lath. Here are some common problems and practical solutions to keep your project on track.
- Problem: Jagged or Bent Edges:
- Solution (Snips): You might be trying to cut too much material at once, or your snips are dull. Take smaller “bites” with your snips and consider sharpening or replacing them. Ensure you’re using the correct type of snips (straight, left, right) for your cut direction.
- Solution (Grinder): Applying too much pressure or moving too fast can cause rough edges. Let the grinder’s speed do the work. A worn-out cutting wheel can also contribute; replace it.
- Problem: Lath Shifts During Cutting:
- Solution: You’re not clamping it securely enough. Use multiple clamps, especially for larger pieces or when using an angle grinder. A stable work surface is also key.
- Problem: Snips Getting Stuck or Jammed:
- Solution: Metal lath, especially expanded mesh, can sometimes “trap” the snips. Try to cut through the solid metal strands rather than the expanded mesh openings when possible. If you encounter resistance, adjust your angle or try a different type of snip.
- Problem: Excessive Sparks and Dust (Grinder):
- Solution: This is normal, but it highlights the need for proper PPE and a clear, fire-safe workspace. Ensure good ventilation, and never cut near flammable materials.
- Problem: Rapid Tool Wear:
- Solution: Cutting metal is tough on tools. Regularly check your snips for sharpness and your grinder wheels for wear. Replace worn wheels promptly. Dull tools are not only inefficient but can also be dangerous.
Addressing these common problems with how to cut metal lath will save you frustration and help you achieve professional results.
Sustainable Practices & Tool Care for Your Workshop
At The Jim BoSlice Workshop, we’re always thinking about the long game – not just for our projects, but for our tools and the environment too. Incorporating sustainable practices and proper tool care makes your work more efficient, cost-effective, and eco-friendly.
Eco-Friendly & Sustainable How to Cut Metal Lath
- Minimize Waste: Plan your cuts carefully to get the most out of each sheet of lath. Layout your cuts like a puzzle before you start. This reduces scrap and saves material.
- Proper Scrap Disposal: Metal lath scraps can be sharp and dangerous. Collect all metal offcuts and dispose of them responsibly. Many recycling centers accept scrap metal. Keep a dedicated, sturdy container for metal waste.
- Buy Quality, Buy Once: Investing in good quality metal lath and durable tools means they last longer, reducing the need for frequent replacements and minimizing manufacturing impact.
How to Cut Metal Lath Care Guide for Your Tools
Your tools are an investment. Taking care of them ensures they’re ready for the next project and perform optimally.
- Clean After Use: Metal dust and debris can corrode tools. Wipe down your snips and grinder after each use. Use a stiff brush for the grinder to remove dust from vents.
- Lubricate Snips: A drop of light machine oil on the pivot points of your aviation snips will keep them operating smoothly and prevent rust.
- Inspect Grinder Wheels: Before and after each use, inspect your angle grinder’s cutting wheel for cracks, chips, or excessive wear. A damaged wheel is extremely dangerous. Replace it immediately if you see any damage.
- Store Properly: Store tools in a dry environment to prevent rust. Toolboxes or wall-mounted racks keep them organized and protected.
- Sharpen Snips (Professionally): While it’s possible to sharpen snips yourself, it’s often best left to a professional for the best edge. Dull snips make cutting harder and less safe.
Following this how to cut metal lath care guide for your tools not only extends their life but also ensures they’re always performing at their best, making your future projects smoother and safer.
Frequently Asked Questions About Cutting Metal Lath
What is the easiest way to cut metal lath?
For most DIYers, using a good pair of aviation snips (yellow-handled for straight cuts) is often the easiest and most controlled method, especially for smaller pieces or intricate cuts. For longer, faster cuts, an angle grinder with a metal cutting wheel is highly efficient, though it requires more safety precautions.
Can I use regular scissors to cut metal lath?
No, regular household scissors are not designed to cut metal lath. They will quickly dull, bend, or break, and you risk injuring yourself. Always use tools specifically designed for cutting metal, such as aviation snips or an angle grinder.
How do I prevent rust on cut edges of metal lath?
Most metal lath is galvanized, which provides a level of rust resistance. However, cut edges expose the raw steel, making them susceptible to rust. For exterior applications or high-moisture areas, you can apply a cold galvanizing compound or a rust-inhibiting primer to the cut edges before installation to offer additional protection.
Is it better to cut metal lath wet or dry?
Metal lath is always cut dry. Cutting it wet would not make it easier and could introduce rust more quickly, especially if the lath isn’t galvanized. Always ensure your lath and tools are dry when working.
What’s the best tool for cutting metal lath around curves or irregular shapes?
Aviation snips are definitely the best tool for cutting metal lath around curves or irregular shapes. Use red-handled snips for left-curving cuts and green-handled snips for right-curving cuts to achieve smoother, cleaner lines without distorting the lath.
Ready to Tackle Your Next Project!
You’ve now got the full rundown on how to cut metal lath with confidence and precision. From understanding the vital role of accurate cuts to selecting the right tools, prioritizing safety, and troubleshooting common issues, you’re well-equipped to integrate metal lath into your next woodworking or DIY build.
Remember, every expert started as a beginner. Take your time, focus on safety, and don’t be afraid to practice on a scrap piece before making your final cuts. The satisfaction of a well-executed project, built with your own hands, is truly rewarding.
Keep honing those skills, stay curious, and always put safety first. We’re here to help you build amazing things. Stay safe and stay comfortable!
