Whether you're renovating an older home or planning new construction, understanding the differences between lath and plaster and modern drywall is essential. Each wall system has distinct characteristics, advantages, and considerations that affect cost, durability, and living experience.
What Is Lath and Plaster?
Lath and plaster is a traditional wall construction method used extensively from the 1700s through the 1940s. It consists of:
- Wood lath: Thin strips of wood nailed horizontally across wall studs with small gaps
- Scratch coat: First layer of plaster pushed through gaps to create 'keys' for adhesion
- Brown coat: Second layer for leveling and strength
- Finish coat: Final smooth or textured decorative surface
This multi-layer system creates walls typically 7/8 to 1 inch thick with substantial mass and density.
What Is Drywall?
Drywall (also called gypsum board or sheetrock) became standard in post-WWII construction. It consists of:
- Gypsum core: Mineral-based material pressed into sheets
- Paper facing: Heavy paper on both sides holds the gypsum together
- Standard thickness: 1/2 inch for most residential applications
- Joint compound and tape: Covers seams between panels
Key Differences Comparison
Durability and Strength
Lath and plaster wins for durability. Its density and thickness make it highly resistant to dents, dings, and impacts. Drywall is more susceptible to damage from furniture, door handles, and normal wear. However, drywall is easier to patch when damaged.
Sound Insulation
Lath and plaster provides significantly better sound insulation due to its mass. The irregular surface and multi-layer construction dampen sound transmission. Drywall transmits sound more readily, though adding insulation helps.
Fire Resistance
Plaster is highly fire-resistant—it can withstand fire for over an hour. Drywall provides good fire resistance (special fire-rated drywall is available), but standard drywall doesn't match plaster's performance.
Insulation Properties
Both materials offer minimal insulation value on their own. However, the density of plaster provides better thermal mass, helping regulate indoor temperatures in some climates.
Homes built before 1940 typically have lath and plaster walls. Post-1950 homes usually have drywall. Homes from 1940-1950 may have either or a combination.
Cost Comparison
Installation Costs
- Drywall installation: $1.50-$3.50 per square foot (materials and labor)
- Lath and plaster installation: $10-$20+ per square foot
- Reason: Plaster requires skilled craftsmen and multiple application sessions with curing time
Repair Costs
- Drywall patch: $100-$400 for typical repairs
- Plaster patch: $200-$800 for similar damage
- Plaster repair requires matching texture and finding skilled plasterers
Advantages of Lath and Plaster
- Superior durability and impact resistance
- Excellent sound insulation between rooms
- Outstanding fire resistance
- Unique character valued in historic homes
- Can create custom curved surfaces and details
- Longer lifespan when properly maintained
Advantages of Drywall
- Significantly lower installation cost
- Faster installation (days vs. weeks)
- Easier to repair with widely available materials
- Easy to run wiring and plumbing through walls
- Readily available skilled installers
- Consistent, flat surfaces for modern finishes
When to Keep Lath and Plaster
Consider preserving existing lath and plaster when:
- The walls are in good condition with minor cosmetic issues
- You value the soundproofing between rooms
- The home has historic significance
- Only localized repairs are needed
- Budget doesn't allow for full removal and replacement
When to Replace with Drywall
Replacing lath and plaster with drywall makes sense when:
- Walls are extensively damaged or failing
- Major electrical or plumbing updates are planned
- Adding insulation is a priority
- Extensive renovation is already underway
- Cost savings outweigh preservation benefits
You can install drywall over intact lath and plaster to save demolition costs—but this reduces room dimensions and requires adjusting door frames and electrical boxes.
Professional Lath and Plaster Services
ELN Remodeling specializes in both lath and plaster repair and new stucco installation throughout San Diego County. Our skilled plasterers can match existing textures, repair damaged sections, and advise whether preservation or replacement best suits your situation. With 24+ years of experience and California license #1136993, we bring traditional craftsmanship to modern homes. Call 760-388-9670 for a consultation.