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Plaster vs drywall: curves or panels?
For plaster vs drywall, choose Plaster for curved surfaces or a 1/16-inch veneer finish, with 60–70°F application conditions (55°F minimum); Drywall for faced gypsum panels with a specified joint treatment and finish. The right choice depends on the backing, moisture exposure, and the finished surface.
| Factor | Plaster | Drywall |
|---|---|---|
| Construction to specify | Conventional plaster: typically three coats over lath (AWCI, undated). Veneer is a different plaster system. | Gypsum panel core covered with paper facing or glass-fiber mat (AWCI, undated). |
| Full-surface veneer coat | NPS (1989) describes a 1/16-inch veneer coat across the wall; this is finish thickness, not wall thickness. | The BOE wall-lining example specifies 1/2-inch drywall, taped and sanded (2025). |
| Moisture to plan for | NPS (1989): gypsum plaster needed protection from water. | EPA identifies the back side of drywall among possible hidden moisture and mold locations (undated). |
| Historical life reference | IHDA (2019) groups drywall and plaster together: 30–70 years; no material-specific ranking. | Same combined IHDA (2019) row: 30–70 years; a planning reference, not a wall-specific prediction. |
| 2025 in-place wall-lining reference | BOE (2025): $8.35–$10.01 per sq ft of wall area for three-coat plaster, no lath. Appraisal reference; lath excluded. | BOE (2025): $2.49–$2.81 per sq ft of wall area for 1/2-inch drywall, taped and sanded. Appraisal reference; finishes differ. |
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Why is plaster not used anymore?
Plaster is covered in USG’s 2010 application guide, which describes veneer and conventional finish coats at 1/16 to 3/32 inch. That source supports a construction method, rather than today’s market share: distinguish wet-applied plaster, veneer over a suitable base, and finished gypsum panels. Sources read: 6 November 2026.
Does plaster mold like drywall?
Moisture control matters with either wall finish. EPA recommends indoor relative humidity below 60 percent, ideally 30–50 percent if possible, and identifies the back of drywall as a hidden mold location; NPS says gypsum plaster needs protection from water. Neither source establishes a mold-immunity advantage for plaster. Sources read: 6 November 2026.
What are the disadvantages of plaster?
Plaster requires control of application and drying conditions. USG gives 60–70°F as optimum, with a 55°F minimum, and explains that rapid drying can open veneer joints through shrinkage. NPS also cautions that gypsum plaster needs water protection; a plaster bid should state the substrate and drying plan. Sources read: 6 November 2026.
How can you tell plaster from drywall?
The backing and finish system distinguish the two: AWCI describes conventional plaster as typically three coats over lath, while gypsum panels have a core covered by paper or glass-mat facing. NPS also describes veneer plaster applied across the entire wall, so a panel-backed wall can still have a plaster finish. Sources read: 6 November 2026.
How thin is veneer plaster?
Veneer plaster is a thin applied finish rather than the full thickness of a traditional plaster wall. NPS’s 1989 brief describes a 1/16-inch full-surface coat; USG describes veneer and conventional finish coats at 1/16 to 3/32 inch. Ask which base and complete system the proposed thickness refers to. Sources read: 6 November 2026.
Does plaster last longer than drywall?
The 2019 IHDA property standards list “Drywall and plaster 30–70” under Walls and Wall Treatments, a combined life-in-years row that supports no lifespan winner between these materials. Treat that historical planning range as context for comparing wall systems, rather than a prediction for an existing wall. Sources read: 6 November 2026.
What should plaster and drywall bids specify?
Specify the wall system before comparing bids: conventional plaster over lath, veneer plaster with a stated coat thickness, or gypsum panels with a stated finish. USG’s 55°F application minimum and NPS’s 1/16-inch veneer example show why the substrate, thickness and drying conditions belong in the written scope. Sources read: 6 November 2026.
Ask each bidder to list: the rooms and wall areas; retained backing and any new lath; plaster binder and base; coat count and thickness; gypsum panel type and thickness; joint treatment and finished surface; primer and paint inclusions; and the ventilation and temperature plan. Keep the same inclusions in each proposed system.
| Priority | Choose |
|---|---|
| A plaster finish that follows curved surfaces | Plaster |
| A faced gypsum panel wall with a specified finish | Drywall |
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