Drywall is a manufactured panel made from a gypsum plaster core sandwiched between two layers of heavy paper, used to create the smooth, paintable interior walls and ceilings found in the vast majority of modern homes. Also known by the trademarked names Sheetrock and gypsum board, drywall replaced traditional wet plaster construction over the middle decades of the twentieth century because it could be installed dramatically faster, required far less specialized skill, and produced a more consistent, predictable finished surface.
Standard drywall panels typically measure four feet wide and come in various lengths, most commonly eight, ten, or twelve feet, with thicknesses ranging from a quarter inch for curved surfaces and repair work up to five-eighths of an inch for fire-rated assemblies and ceilings needing extra rigidity to resist sagging between framing members. The panels are fastened directly to wall studs or ceiling joists using drywall screws or nails, then the seams between panels are covered with tape and joint compound, sanded smooth, and finished to create the appearance of one continuous, seamless surface.
Beyond the standard white-paper-faced panel most people picture, drywall actually comes in numerous specialized formulations engineered for particular conditions. Moisture-resistant boards, often called greenboard, handle the humidity of bathrooms and laundry rooms better than standard panels. Fire-rated Type X drywall, thicker and reinforced with glass fibers within the gypsum core, slows the spread of fire through walls and ceilings and is required by code in specific locations like garage-to-house separations. Soundproofing drywall uses viscoelastic polymer layers to dramatically reduce noise transmission between rooms, while impact-resistant panels stand up to the abuse of high-traffic hallways, stairwells, and areas prone to accidental damage.
What Does Drywall Involve?
- A gypsum plaster core encased in heavy paper facing
- Standard, moisture-resistant, fire-rated, and specialty formulations
- Installation via screws or nails directly to framing
- Taped and compounded seams finished to a smooth, paintable surface
Why Is Drywall Important?
Drywall’s dominance in residential construction comes down to a genuinely compelling combination of speed, cost, and performance. A crew can frame and hang an entire home’s interior walls in days rather than the weeks that traditional lath-and-plaster construction once required, and the material itself is inexpensive relative to the finished wall surface it produces. Beyond simple economics, drywall’s gypsum core provides real fire resistance because the mineral naturally releases chemically bound water when heated, actively slowing combustion and heat transfer through the wall assembly for a meaningful period, which is precisely why building codes specify drywall thickness and type at fire-rated locations rather than treating it as purely cosmetic.
Drywall’s fundamental limitation is that it’s genuinely fragile compared to plaster, dent-prone from furniture impacts, doorknobs, and moving boxes, and it has essentially no tolerance for sustained moisture exposure before the paper facing begins supporting mold growth and the gypsum core softens and loses structural integrity. This vulnerability is exactly why choosing the correct drywall type for each specific room and application, rather than defaulting to standard panels everywhere, meaningfully affects how well a home’s interior surfaces hold up over years of actual use.
Drywall vs. Gypsum Board
These terms describe the identical material and are used completely interchangeably throughout the construction industry, with drywall serving as the common, everyday term most homeowners and contractors reach for in conversation, while gypsum board appears more frequently in technical specifications, manufacturer literature, and building code documentation where precise, formal terminology is preferred.