Construction glossary · Envelope and finishes

What is drywall typesin construction?

In US commercial construction, drywall types are the different gypsum board products specified by core, thickness, and facing for a given assembly: standard 1/2 inch, fire-rated 5/8 inch Type X, moisture-resistant (MR) board, mold-resistant board, abuse-resistant board, and shaftliner. The estimator reads the wall types schedule and fire ratings to pick the right product for each partition. The board type drives both the unit cost and the labor for fastening and finishing.

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Updated August 2026 · Reviewed by the Ruh construction team

Standard sheet 4x8 ft, 1/2 inType X fire 5/8 in, 1-hr ratedMoisture board wet areas / tileCoverage 32 sf per sheet

Common gypsum board types by use

The definition

Drywall types, explained.

Drywall types are gypsum panels distinguished by core formulation, thickness, and face paper. Standard 1/2 inch board is the default for non-rated interior partitions. Type X is a 5/8 inch panel whose gypsum core has glass fibers added to resist fire, which is what lets a single layer help achieve a one-hour rating in tested assemblies; Type C is a higher-performance fire core used in some two-hour and shaft assemblies. MR (moisture-resistant, green) board and mold-resistant board go in wet or humid areas such as restrooms and janitor closets. Abuse-resistant and impact-resistant board go in corridors, gyms, and high-traffic walls. Shaftliner (1 inch) goes in elevator and mechanical shafts. The estimator matches each wall type tag to its UL or GA assembly, then counts the square feet by type. Getting the type wrong understates both material cost and the screw and finishing labor.

How it is measured

Quantify drywall by the square foot of board, separated by type and by number of layers, because a two-layer rated wall doubles the board on that face. Pull wall lengths from the floor plan and heights from the partition schedule or section details, then multiply length by height for each face. Read the wall types legend and the life-safety plan to assign Type X versus standard versus MR to each run. Add a waste factor (commonly 8 to 12 percent) for cuts and breakage. Convert square feet to 4x8 (32 sf) or 4x12 (48 sf) sheets for ordering. Note ceiling board separately, and flag soffits and furring that add board not shown in linear wall takeoff.

Worked example

A worked drywall types example.

Worked example

Illustrative, US market. A one-hour corridor partition runs 80 lf at 10 ft tall, board both faces. One face is 80 x 10 = 800 sf, so two faces are 1,600 sf. The wall type calls for single-layer 5/8 inch Type X to meet the rating, not 1/2 inch standard. At 32 sf per 4x8 sheet, 1,600 sf needs 50 sheets net; at a 10 percent waste factor that rounds to 55 sheets of 5/8 Type X. The material delta of choosing Type X over standard matters: at an illustrative 0.55 vs 0.42 per sf, the upgrade adds (0.55 - 0.42) x 1,600 = 208 dollars in board alone, before the heavier 5/8 board's added hanging labor. Specifying 1/2 inch standard here would have failed the rating and undercounted the bid.

How Ruh handles it

How Ruh handles drywall types.

Ruh reads the wall types schedule, the life-safety plan, and the partition details, then takes off board area face by face, splitting square feet by drywall type and layer count so Type X, MR, and standard are each their own line. It prices the board, screws, and finishing on the contractor's own price book and converts to sheet counts with the firm's waste factor. The estimator reviews the type assignments against the ratings and signs off.

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Drywall types: frequently asked questions

When do I need 5/8 Type X instead of 1/2 inch standard?+

Use 5/8 Type X anywhere the wall type tag references a fire-rated assembly, typically corridors, demising walls, shafts, and stair enclosures. Standard 1/2 inch is fine only for non-rated partitions. Always confirm against the specific UL or GA assembly the design team listed, since the rating depends on the whole assembly, not the board alone.

Is mold-resistant board the same as moisture-resistant (green) board?+

No. MR (green) board resists moisture in the core and paper; mold-resistant board adds treated paperless or fiberglass facing to resist mold growth. Specs increasingly call for mold-resistant board in restrooms and behind tile, so read the spec rather than defaulting to green board.

Do drywall types change my finishing labor?+

Yes. The 5/8 inch board is heavier to hang, and abuse-resistant and impact-resistant panels are denser and slower to cut and screw. Type also interacts with finish level, so price hanging and finishing as separate line items rather than one blended square-foot rate.

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What is drywall typesin construction?

Drywall types, explained.

A worked drywall types example.

Worked example

How Ruh handles drywall types.

Drywall types: frequently asked questions

Related terms

Knowing what drywall types means is the easy half.

Try Ruh on a bid you are pricing now.

Put your next takeoff on Ruh.