Drywall became the standard building material in the United States during the 1950s, replacing plaster in most new construction

Plaster dominated interior walls from the 1800s through the early 1900s. It was applied wet over wooden lath strips, dried hard, and created smooth, durable surfaces. But plaster was slow to install, required skilled workers, and took weeks to cure. Drywall—sheets of gypsum core sandwiched between paper—arrived as a faster, cheaper alternative.

The shift was not sudden. Drywall was invented in the early 1900s and used in some commercial buildings by the 1920s. But it did not become common in residential homes until after World War II, when housing demand exploded and builders needed to work faster. By the 1960s, plaster was rare in new homes. Today, most houses built after 1970 have drywall throughout.

If your home was built before 1950, it almost certainly has plaster walls. If it was built between 1950 and 1970, it may have a mix of both. Homes built after 1970 are almost entirely drywall.

Key Takeaways

  • Plaster was the standard wall material until the 1950s; drywall became dominant after World War II due to speed and cost.
  • Plaster takes weeks to cure and requires skilled installation; drywall can be hung and finished in days.
  • Homes built before 1950 are almost certainly plaster; homes built after 1970 are almost certainly drywall.
  • Plaster is harder to repair and more expensive to patch than drywall, but it is more durable and soundproof.
  • Knowing which material your walls are made of matters for repairs, renovations, and understanding what to expect during maintenance.

Why builders switched from plaster to drywall after World War II

After 1945, American housing construction accelerated dramatically. Returning soldiers needed homes, and developers needed to build them fast and cheaply. Plaster could not keep up. A plasterer had to explore multiple coats by hand, wait for each to dry, and smooth the surface—a process that took two to three weeks per room. Drywall sheets could be nailed to studs in hours and finished in days.

Labor costs also favored drywall. Plastering required years of apprenticeship and commanded high wages. Drywall installation could be learned quickly and performed by less-skilled workers. For a builder constructing dozens of homes, the savings were enormous.

Drywall also standardized the building process. Sheets came in uniform sizes, joints were predictable, and finishing techniques could be taught to any worker. Plaster, by contrast, depended on the skill of individual craftsmen. Two plasterers might produce different results on the same wall.

How to tell if your walls are plaster or drywall

The easiest way is to look at the age of your house. But if you are unsure, there are physical differences. Plaster walls are usually thicker—often one inch or more—and feel rock-hard when you tap them. Drywall is thinner, typically half an inch, and sounds hollow when you knock on it between studs.

Plaster also cracks differently. It develops long, jagged cracks that follow stress lines in the wall. Drywall cracks are usually straight lines along the seams where sheets meet. If you see a crack that branches like a tree, it is almost certainly plaster.

Another test: try to drive a nail into the wall. A drywall nail will go in with moderate pressure. A plaster nail will bounce off or require a hammer blow. If you are renting, do not try this test—ask your landlord or look at the lease, which may specify the wall material.

Why plaster lasted so long before drywall took over

Plaster was not replaced because it was bad. It was replaced because drywall was faster and cheaper to produce at scale. Plaster walls are actually superior in several ways: they are more soundproof, more fire-resistant, and more durable. A plaster wall can last 100 years with minimal maintenance. Drywall typically lasts 30 to 40 years before it begins to deteriorate.

Plaster also creates a harder, smoother surface that resists dents and damage better than drywall. High-end homes and commercial buildings still use plaster for this reason. But for mass-market residential construction, the speed and cost advantage of drywall was decisive.

The transition was also driven by standardization. Drywall allowed builders to use the same techniques and materials across all their projects. Plaster required site-specific mixing, process, and curing—variables that made large-scale building more complicated.

What changed in wall construction when drywall replaced plaster

The underlying frame stayed the same: wooden studs spaced 16 inches apart. But the surface layer changed completely. Plaster required wooden lath—thin strips nailed horizontally across the studs—to give the wet plaster something to grip as it dried. Drywall sheets were nailed or screwed directly to the studs, eliminating the lath step.

Finishing also changed. Plaster walls were sanded smooth and painted. Drywall joints are covered with joint compound (also called "mud"), sanded, and painted. The joint compound creates a seamless surface, but it is softer and more prone to damage than hardened plaster.

Electrical and plumbing work also became easier with drywall. Holes could be cut quickly and patched easily. With plaster, cutting holes was messy and patching required re-plastering, which took time and skill.

Plaster walls in older homes: what you need to know for repairs

If your home has plaster, repairs are more expensive and time-consuming than drywall repairs. A small hole in plaster requires a plasterer to explore new plaster, wait for it to cure, sand it, and paint it. A drywall patch can be done with joint compound and takes one day.

Plaster also contains asbestos in some homes built before 1980. If you are planning major renovations or repairs, have the plaster tested before disturbing it. Asbestos is dangerous only when it is broken up and the fibers become airborne, so intact plaster is safe. But removal or heavy sanding requires professional abatement.

Plaster cracks are common and usually not serious. They occur as the house settles and wood framing shifts. Small cracks can be filled with spackling compound and painted. Large cracks or cracks that grow over time may indicate structural movement and should be inspected by a professional.

The timeline of drywall adoption across the United States

Drywall adoption was not uniform across the country. It spread fastest in areas with rapid post-war development: California, the Southwest, and the suburbs of major cities. Rural areas and older urban neighborhoods continued using plaster longer because construction was slower and builders were more traditional.

By 1960, drywall was standard in most new suburban homes. By 1970, it was nearly universal in residential construction. Plaster persisted longer in commercial buildings, high-end residences, and renovation work, where its superior durability and soundproofing justified the extra cost.

Today, plaster is used mainly in restoration work, historic preservation, and luxury construction. Most drywall is made by a handful of large manufacturers—USG, National Gypsum, and Knauf are the largest—and the product is standardized across the country.

Frequently Asked Questions

Is plaster better than drywall?

Plaster is more durable, soundproof, and fire-resistant, and it lasts longer. Drywall is faster to install, cheaper, and easier to repair. For a home built today, drywall is the practical choice. For an older home with plaster, keeping the plaster is usually fine unless it is damaged or you are doing major renovations.

Can I replace plaster with drywall?

Yes. Drywall can be installed over plaster if the plaster is stable and not crumbling. If the plaster is in poor condition, it should be removed first. This is a job for a contractor because it involves removing the old material, checking the studs, and installing new drywall properly. The cost varies by the size of the area and local labor rates.

Does plaster contain asbestos?

Some plaster applied before 1980 contains asbestos. If you are planning to remove or heavily sand plaster, have it tested first. If it contains asbestos, hire a licensed abatement contractor. Intact plaster with asbestos is safe and does not need to be removed.

Why do old houses have thicker walls?

Plaster walls are thicker because plaster is applied in multiple coats over wooden lath. Drywall is a single layer of material, so it is thinner. The thicker plaster walls also provide better soundproofing and fire resistance, which is one reason older homes feel more solid than newer ones.

What should I do if my plaster walls are cracking?

Small cracks are normal and can be filled with spackling compound and painted. Large cracks, cracks that grow over time, or cracks that appear suddenly may indicate structural movement and should be inspected by a professional. Do not assume all plaster cracks are serious—most are just the house settling.