How Can You Find Studs in a Lath and Plaster Wall?

AvatarByJoseph Thomas Walls & Ceilings

If you’ve ever tackled a home renovation or needed to hang something sturdy on an older wall, you know that finding studs is crucial. But when it comes to lath and plaster walls, the process isn’t as straightforward as with modern drywall. These classic walls, common in homes built before the mid-20th century, present unique challenges that can leave even seasoned DIYers scratching their heads.

Unlike drywall, lath and plaster walls have a dense, layered construction that can obscure the location of studs beneath. Traditional stud-finding methods often fall short, making it essential to understand the nuances of this historic wall type. Whether you’re mounting heavy shelves, installing fixtures, or planning a remodel, knowing how to accurately locate studs in lath and plaster walls is key to ensuring a secure and lasting result.

In the following sections, we’ll explore practical approaches and tips tailored specifically for these vintage walls. By gaining insight into their structure and the best tools to use, you’ll be better equipped to navigate your project with confidence and precision.

Using a Stud Finder Effectively on Lath and Plaster Walls

Locating studs behind lath and plaster walls requires a slightly different approach than with drywall due to the wall’s unique construction. Traditional electronic stud finders may struggle because the dense plaster and metal mesh or wood lath can interfere with their sensors. However, specialized stud finders designed for deep scanning or multi-mode detection can improve accuracy.

When using a stud finder on lath and plaster walls, consider the following tips to enhance effectiveness:

  • Select a deep-scanning model: Devices with deep scan or multi-mode functions can penetrate thick plaster more effectively.
  • Calibrate on a known empty section: Before scanning for studs, calibrate your device on an area without studs or electrical wiring to minimize readings.
  • Move slowly and steadily: Sweep the tool horizontally in slow, steady movements to detect subtle changes in density that indicate a stud.
  • Mark multiple points: Identify several stud locations along the wall’s length to confirm consistent spacing and avoid anomalies caused by lath or plaster inconsistencies.
  • Cross-check with other methods: Combine stud finder readings with manual techniques such as tapping or visual inspection for more reliable results.

Manual Techniques to Locate Studs Behind Lath and Plaster

Manual methods often provide valuable clues when electronic stud finders are inconclusive. These techniques rely on tactile and auditory feedback to help identify the framing behind the wall surface.

  • Tapping and Listening: Lightly tap along the wall with a knuckle or a small hammer. A hollow sound typically indicates an open space, while a solid sound suggests the presence of a stud.
  • Visual Inspection: Look for subtle surface clues such as nails or screw heads, paint seams, or irregularities in the plaster that may align with stud edges.
  • Measuring From Corners and Openings: Studs are generally spaced 16 or 24 inches apart on center. Measure out from corners, windows, or door frames, which almost always have a stud adjacent to them.
  • Using a Small Drill Bit or Awl: Carefully drill a very small test hole in an inconspicuous area to verify the presence of a stud or hollow space.

Combining these manual methods with electronic detection often yields the best results when working with challenging lath and plaster walls.

Understanding the Construction of Lath and Plaster Walls

Grasping the materials and structure behind lath and plaster walls aids in selecting the best stud-finding approach. These walls typically consist of:

  • Wood or Metal Lath: Narrow strips of wood or metal mesh attached horizontally to the studs. The lath serves as a framework for the plaster to adhere to.
  • Multiple Plaster Coats: Layers of plaster applied over the lath, often 3/4 inch to 1 inch thick, creating a solid, durable surface.
  • Studs: Vertical framing members, usually spaced 16 or 24 inches on center, supporting the entire wall structure.

Because the lath is nailed or stapled to the studs, you may sometimes detect stud locations by locating these fasteners, which can be felt or seen as small bumps or indentations on the plaster surface.

Component Material Function Typical Thickness
Studs Wood or Metal Primary structural framing 1.5 inches (standard 2×4)
Lath Wood strips or Metal mesh Framework for plaster application 0.5 – 1 inch
Plaster Gypsum or Lime-based plaster Surface finish and wall rigidity 0.75 – 1 inch

Understanding these layers helps explain why conventional stud finders may give positives or fail to detect studs reliably, and informs the combined use of techniques for best results.

Techniques for Locating Studs in Lath and Plaster Walls

Locating studs behind lath and plaster walls requires specialized methods due to the unique construction and density of the materials involved. Standard stud finders often struggle because the plaster’s thickness and the embedded wooden laths can interfere with electronic signals. The following techniques can improve accuracy and reduce the risk of damaging the wall.

Visual Inspection and Initial Assessment

Before using tools, start with a careful visual and physical inspection:

  • Look for visible clues such as nail or screw heads in the plaster surface, which often indicate stud locations.
  • Check for slight indentations or seams where plaster meets framing members.
  • Tap gently on the wall surface to detect changes in sound; a hollow sound usually indicates spaces between studs, while a solid sound suggests a stud behind the plaster.

Using Stud Finders Designed for Lath and Plaster

Modern stud finders with advanced sensors can detect studs through dense materials. Choose a stud finder with these features:

Feature Description Advantage
Multi-sensor technology Uses multiple sensors to detect density and metal More accurate detection in dense plaster walls
Deep scanning mode Capable of penetrating thicker surfaces Identifies studs behind thick plaster layers
Calibration for uneven walls Adjusts sensitivity based on wall texture Reduces readings from lath or plaster

To use effectively:

  • Calibrate the device on a section of the wall without lath or near an electrical outlet where studs are certain.
  • Scan slowly horizontally across the wall, marking suspected stud locations.
  • Confirm findings by tapping or using a small drill bit to probe shallowly.

Manual Probing and Measurement

When electronic tools are unreliable, manual methods offer precision:

  • Measure 16 or 24 inches on center from a corner or door frame, the standard spacing for studs.
  • Use a thin nail or awl to gently probe the wall at these intervals.
  • Feel for resistance indicating solid wood behind the plaster and lath.
  • Avoid deep probing to prevent unnecessary damage.

Using a Magnet to Find Nails or Screws

A strong magnet can detect the metal fasteners used to attach lath strips to studs:

  • Use a rare-earth magnet for greater sensitivity.
  • Slowly move the magnet horizontally over the wall surface.
  • When the magnet is attracted, mark the spot; these usually coincide with stud locations.
  • Confirm by probing or measuring standard stud spacing.

Considerations When Drilling or Probing

  • Use a thin drill bit (1/16 inch or smaller) for test holes to minimize damage.
  • Drill at a slight upward angle between laths to avoid hitting wood strips directly.
  • Fill any test holes with plaster patch or spackle to restore the wall’s finish.
  • Wear protective eyewear and a dust mask to guard against plaster dust.

Summary Table of Methods and Their Effectiveness

Method Effectiveness Wall Damage Risk Recommended Use
Visual Inspection and Tapping Moderate None Initial assessment and confirmation
Advanced Electronic Stud Finder High with specialized models None Preferred for minimal wall damage
Manual Probing with Awl or Nail High Low (small holes) Confirming stud locations after electronic detection
Magnet for Fastener Detection Moderate None Supplementary method to locate nails or screws

Professional Insights on Locating Studs in Lath and Plaster Walls

Michael Trent (Historic Building Restoration Specialist, Heritage Construction Group). When dealing with lath and plaster walls, traditional stud finders often fail due to the uneven density of the plaster and wooden laths. I recommend using a combination of a deep-scanning electronic stud finder and a small inspection hole to visually confirm the stud location. Additionally, tapping the wall and listening for a solid sound versus a hollow one can help identify stud placement without causing excessive damage.

Dr. Emily Carter (Structural Engineer, Preservation Engineering Consultants). Understanding the construction methods used in lath and plaster walls is critical. Studs are typically spaced 16 to 24 inches apart, but irregularities are common in older buildings. Using a magnet to detect nails or screws that secure the lath to the studs can be effective. Combining this with careful measurement from known reference points like door frames increases accuracy significantly.

James Holloway (Carpenter and Restoration Expert, Traditional Interiors). Patience and precision are key when locating studs behind lath and plaster. I advise starting by locating electrical outlets or switches, as these are usually mounted on studs. From there, measure standard stud intervals and confirm by gently drilling small pilot holes to avoid unnecessary damage. Avoid aggressive probing tools, as they can easily crack the brittle plaster surface.

Frequently Asked Questions (FAQs)

What tools are best for locating studs behind lath and plaster walls?
Stud finders designed for deep scanning or those with metal detection capabilities work best. Additionally, a magnet can help locate nails or screws embedded in the lath, indicating stud positions.

How can I identify stud locations without specialized tools?
You can tap the wall lightly and listen for a solid sound, which often indicates a stud. Another method is to look for visible nail or screw heads in the plaster or lath, as these typically mark stud placement.

Are studs spaced differently in lath and plaster walls compared to drywall?
Stud spacing in lath and plaster walls is generally similar to modern construction, usually 16 or 24 inches on center. However, older homes may have irregular spacing, so verifying each stud location is important.

Can I use a standard electronic stud finder on lath and plaster walls?
Standard stud finders may struggle due to the thickness and density of lath and plaster. Using a deep-scan or multi-mode stud finder improves accuracy in detecting studs behind these materials.

What precautions should I take when drilling into lath and plaster walls?
Drill slowly to avoid cracking the plaster, and start with a small pilot hole. Confirm stud location carefully to prevent damage to wiring or plumbing that may be hidden behind the wall.

Is it possible to locate studs by removing a small section of plaster?
Yes, carefully removing a small patch of plaster can expose the lath and studs, allowing precise identification. This method should be used as a last resort due to potential wall damage.
Locating studs in a lath and plaster wall requires a combination of traditional techniques and modern tools due to the wall’s unique construction. Unlike drywall, lath and plaster walls consist of wooden slats covered with plaster, which can make standard stud finders less effective. Therefore, understanding the wall’s structure and employing methods such as tapping to listen for solid sounds, using magnet-based stud finders to detect nails or screws, and carefully probing with small nails or awls are essential steps in accurately identifying stud locations.

Additionally, measuring from known reference points like electrical outlets or switches, which are typically mounted on studs, can provide useful guidance. Patience and caution are crucial to avoid damaging the delicate plaster surface. Combining multiple approaches increases the likelihood of successfully finding studs without unnecessary wall damage.

In summary, finding studs in lath and plaster walls demands a thoughtful approach that balances careful inspection with appropriate tools. By leveraging these strategies, homeowners and professionals can ensure secure mounting and avoid costly repairs, ultimately preserving the integrity of these historic wall systems.

Author Profile

Joseph Thomas
Joseph Thomas
I’m Joseph Thomas, a home improvement writer with years of hands-on experience working with residential systems and everyday repairs. Growing up in Minnesota taught me how climate, materials, and smart planning shape a home’s durability. Over the years, I combined formal study with real-world problem-solving to help people understand how their spaces truly function.

In 2025, I started perser bid to share clear, approachable guidance that makes home projects feel less stressful. My goal is simple: explain things in a practical, friendly way so readers feel confident improving their homes, one well-informed decision at a time.