Gypsum Board Standard Sizes and Thicknesses (mm)

The most common gypsum board size is 1,200 × 2,400 mm at 12.5 mm thick, with tapered long edges. Under EN 520, standard widths are 600, 625, 900, 1,200 and 1,250 mm, and common thicknesses are 9.5, 12.5 and 15 mm. ASTM C1396 boards are 48 in. (1,220 mm) wide, usually 1/2 in. (12.7 mm) or 5/8 in. (15.9 mm) thick. Gulf markets use both.

For a plant investor the size question has a second side: which widths, thicknesses and edges your line must make, and how that changes its output. This page gives the standard sizes in millimeters for both systems, the tolerances, the Gulf picture, and what each choice means for the line.

Gypsum Board Standard Size in mm: Quick Reference

EN 520 does not fix lengths for most board types; producers choose them to suit framing, ceiling heights and transport. The lengths listed are common catalog sizes, not requirements.

EN 520 Gypsum Board Sizes and Tolerances

EN 520 sets preferred widths and thicknesses, and tolerances on every individual measurement (EN 520, clause 5.9):

A board described as “12.5 mm” must therefore measure between 12.0 and 13.0 mm at every point, with no more than 0.8 mm between the thickest and thinnest reading on one board. For type definitions and strength requirements, see our guide to the EN 520 gypsum board standard.

ASTM C1396 Sizes Converted to mm

North American boards are specified in inches. Here are the usual sizes with their metric values (ASTM C1396/C1396M uses the bracketed metric figures shown in the standard):

For wallboard, C1396 allows widths up to 48 in. (1,220 mm) or up to 54 in. (1,370 mm). The 2017 edition sets thickness tolerance at ±0.015 in. (±0.40 mm), length tolerance at ±1/4 in. (±6 mm) and end squareness at ±1/8 in. (±3 mm). Backing board, coreboard and shaftliner run from 16 to 48 in. (406 to 1,220 mm) wide. In practice, a US producer’s catalog for regular board lists 48 in. widths at 1/4, 3/8 and 1/2 in., 54 in. widths at 1/2 in., and lengths from 8 ft up to 15 ft depending on thickness (PABCO Gypsum product data). Check the current edition before you set limits; our page on ASTM C1396 for gypsum board producers explains the full specification.

Note the two near-misses between systems: 12.5 mm and 12.7 mm, and 1,200 mm and 1,220 mm. They look interchangeable but they are not. A nominal 12.5 mm board sits only 0.1 mm inside the C1396 lower limit for 1/2 in. board (12.7 − 0.40 = 12.30 mm, using the C1396-17 tolerance), so normal production variation pushes it out; and a 1,200 mm board does not land on studs at 16 in. or 24 in. centers.

Gypsum Board Sizes in Saudi Arabia, the UAE and the Gulf

The Gulf is a mixed market. The GCC Standardization Organization (GSO) has adopted both systems: GSO EN 520:2004+A1:2021 is listed against EN 520:2004+A1:2009, and GSO ASTM C1396/C1396M:2022 against ASTM C1396-17 (GSO store listings). GSO has also published a Gulf standard for the facing paper itself, GSO 2763:2024 Plaster Board liner Paper – Requirements.

Local practice shows both widths. A major producer’s UAE catalog lists its regular 12.5 mm board in 1,200 × 2,400 mm, 1,200 × 3,000 mm and 1,220 × 2,440 mm (Knauf UAE product data). So within one market you may need to supply metric thickness at both 1,200 mm and 1,220 mm widths.

Certification follows the specification your buyers name. In Dubai, the Dubai Central Laboratory certifies gypsum boards to ASTM C1396-17 through factory assessment and surveillance (Dubai Municipality). In Saudi Arabia and the other GCC states, check which edition the national standards body has adopted and the conformity route for imported and locally made boards before you fix your product list.

What this means if you are building a plant to serve Saudi Arabia, the UAE or neighboring markets:

1. Ask your target distributors and contractors which standard their project specifications cite: EN 520, ASTM C1396, or both.
2. List the widths you must supply. If both 1,200 and 1,220 mm are needed, the forming section and edge belts must be designed for it.
3. Decide on thickness basis: 12.5 mm (EN) or 12.7 mm (ASTM), and whether you need 15 mm or 15.9 mm fire board.
4. Agree the lengths. Length is the easiest dimension to change on a running line, but bundle sizes and stacking affect packing and storage.

Gypsum Board Standard Thickness in mm by Use

The fire ratings in the ASTM column are the C1396 minimums for Type X board in its defined test assembly. EN 520 Type F has no rating of its own; the rating belongs to the tested wall or ceiling system.

Gypsum Board Edge Types

The long edges are formed on the line; the ends are cut square by the knife and the end saws.

• Tapered edge. The most common for walls and ceilings that are taped and finished. EN 520 requires a taper width of 40–80 mm and a depth of 0.6–2.5 mm. ASTM C1396 requires the edge to be 0.020–0.090 in. (0.51–2.29 mm) thinner than the board’s average thickness.
• Square edge. For boards that will be plastered over, used as a base layer, or laid in grid ceilings.
• Bevelled / beveled edge. A small chamfer, often for visible joints or as a base for a thin skim.
• Half-rounded and rounded edges (EN 520), often combined with a taper, so that the joint filler grips without paper tape.
• Featured edge (ASTM), a decorative edge profile; V-tongue-and-groove for some backing boards and coreboards.

Each edge profile needs its own edge-forming tools. List every profile you plan to sell in the requirement brief, because adding one later means new tooling and trial runs.

Gypsum board weight by thickness

Board weight depends on density, so it varies by producer and type. The Gypsum Association gives typical values of 6.8 kg/m² at 3/8 in. (9.5 mm), 9.8 kg/m² at 1/2 in. (12.7 mm) and 12 kg/m² at 5/8 in. (15.9 mm) (GA-235). Lightweight boards are lighter: the same US catalog lists its regular 1/2 in. board at about 1.5 lb/ft² (about 7.3 kg/m²). The UAE data above work out to about 7.4 kg/m² for 12.5 mm board (21.3 kg for a 2.88 m² sheet). For planning, our reference line uses 7.0 kg of stucco per m² on 12 mm board.

What Board Sizes Mean for Your Production Line

• Width is set by the forming section. The forming station, edge belts and setting belt are built for a width range. Our reference line forms 1.2 m board. If you need 1,220 or 1,250 mm, specify it at the start.
• Thickness changes output. Our reference line covers 6–25 mm and is rated at 3,000,000 m² a year on 12 mm board. Thicker board carries more water into the dryer, so the line runs slower in m² terms; a mix weighted to 15 mm board makes fewer square meters a year.
• Length is the flexible dimension. It is set by the cutting knife and end trim saws, so changing from 2,400 to 3,000 mm is mainly a control setting, with knock-on effects on stacking, bundle size and storage.
• Tolerances drive maintenance. The minus-only width and length tolerances in EN 520, and the ±0.40 mm thickness tolerance in C1396-17, are met through forming plate condition, edge former wear and knife accuracy. Build them into your quality testing routine.

FAQ

What is the standard size of gypsum board in mm?

The most common size in EN 520 markets is 1,200 × 2,400 mm at 12.5 mm thick, with 1,200 × 3,000 mm also widely used. EN 520 widths are 600, 625, 900, 1,200 and 1,250 mm. In ASTM markets the standard width is 1,220 mm (48 in.) and lengths run from 2,440 mm (8 ft) to about 4,880 mm (16 ft).

What is the standard thickness of gypsum board in mm?

Under EN 520, common thicknesses are 9.5, 12.5 and 15 mm, with a minimum of 6 mm. Under ASTM C1396, the common thicknesses are 12.7 mm (1/2 in.) and 15.9 mm (5/8 in.), plus 6.4 and 9.5 mm. Shaftliner and coreboard are 19.0 or 25.4 mm. Standard walls use 12.5 or 12.7 mm; fire-rated walls usually 15 or 15.9 mm.

What gypsum board sizes are used in Saudi Arabia and the UAE?

Both metric and ASTM-based sizes are sold. GSO has adopted EN 520 and ASTM C1396 as Gulf standards. A major producer’s UAE catalog lists 12.5 mm board in 1,200 × 2,400, 1,200 × 3,000 and 1,220 × 2,440 mm. Dubai certifies boards to ASTM C1396-17. Confirm which standard your target projects specify before you fix your product list.

Is 12.5 mm the same as 1/2 inch gypsum board?

No. Half an inch is 12.7 mm. A 12.5 mm board is 0.2 mm thinner, leaving only 0.1 mm before the ASTM C1396 lower limit of 12.30 mm (per C1396-17; check the current edition), while EN 520 allows a 12.5 mm board to go down to 12.0 mm. Widths differ too: 1,200 mm metric board versus 1,220 mm (48 in.) ASTM board. Treat them as different products with different forming settings.

Can one production line make several board sizes?

Yes, within the range it is designed for. Length is changed at the cutting knife, and thickness at the forming station within the line’s range: 6–25 mm on our reference line. Width is the hardest to change, because the forming and edge-forming sections are built for it. Specify every width and edge profile you need before the line is designed.

Planning a Gypsum Board Line for Your Market’s Sizes?

Send us the board sizes, thicknesses, edge profiles and standard your market uses, and we will configure the line around them. See our gypsum board production line for the process and consumption figures, and the gypsum board plant setup guide for the full planning sequence.

Sources

• Rwanda Standards Board, DRS 632:2026 (draft), Gypsum plasterboards — Definitions, requirements and test methods, prepared with reference to BS EN 520:2004+A1:2009: https://www.rsb.gov.rw/fileadmin/user_upload/DRS_632_2026.pdf
• ASTM International, C1396/C1396M-17, Standard Specification for Gypsum Board (scope and edition history): https://store.astm.org/c1396_c1396m-17.html
• iTeh Standards, ASTM C1396/C1396M-17 sample pages (sections 4–6): https://standards.iteh.ai/catalog/standards/astm/3708e9e7-b64b-4be1-8613-a31a666c882c/astm-c1396-c1396m-17
• GCC Standardization Organization, GSO EN 520:2004+A1:2021: https://www.gso.org.sa/store/standards/GSO:790021/GSO%20EN%20520:2004+A1:2021?lang=en
• GCC Standardization Organization, GSO ASTM C1396/C1396M:2022: https://ysmo.gso.org.sa/store/standards/GSO:803391?lang=en
• GCC Standardization Organization, GSO 2763:2024, Plaster Board liner Paper – Requirements: https://www.gso.org.sa/store/standards/GSO:925240/GSO%202763:2024?lang=en
• Dubai Municipality, Dubai Central Laboratory, DM-DCLD-RD-DP21-2198 (IC), Certification of Gypsum Boards as per ASTM C1396-17: https://www.dm.gov.ae/wp-content/uploads/2020/05/DM-DCLD-RD-DP21-2198-IC.pdf
• Knauf UAE, Regular (RG) 12.5 mm gypsum board product data: https://knauf.com/en-AE/p/product/regular-rg-12.5mm-gypsum-board-enbs-10003_0606
• PABCO Gypsum, PABCO Regular product data: https://pabcogypsum.com/products/pabco-regular/
• Gypsum Association, GA-235 Gypsum Board Typical Mechanical and Physical Properties: https://gypsum.org/2019/04/ga-235-2019-gypsum-board-typical-mechanical-and-physical-properties/