Plasterboard looks like flat, paper-faced gypsum sheets with tapered long edges, square ends, printed edge marks, and a pale ivory or grey front.
If you’ve ever stared at a bare stud wall and wondered what goes on top, the answer in most homes is plasterboard. Before paint or plaster skim hides it, the board itself has clear sight clues you can learn in a minute. This guide shows the surface, edges, colours, and small details that set it apart from other panels.
Quick Visual Snapshot
Think of a rigid panel about door height, the face paper smooth and chalk-flat. Along the two long sides you’ll often see a shallow recess: that’s the tapered edge made for joint tape. The short sides end square. Many boards carry faint ink text along an edge or on the back, listing size, type, and fire or moisture codes.
If you only have seconds, these traits make ID simple.
| Visual Feature | What It Looks Like | What It Tells You |
|---|---|---|
| Face Paper Colour | Ivory or light grey front; brown/kraft back | Standard wallboard ready for paint or a skim |
| Long Edges | Shallow, continuous recess along both sides | Tapered for taping and a flush finish |
| Short Ends | Cut square and clean | Forms a butt joint that needs wider feathering |
| Printed Marks | Ink text along an edge or on the back | Size, type, and compliance info at a glance |
| Fastener Dimples | Small recesses over studs or joists | Ready for joint compound after fixing |
| Cut Edge | Paper face with a white, chalky core | Confirms a gypsum core, not wood or cement |
| Sheet Size | About 1200×2400 mm (or 4×8 ft) | Typical board size for walls and ceilings |
| Thickness | About 12.5 mm (or 1/2 in) for walls | Common choice for general rooms |
For a clear, manufacturer-backed overview of what this panel is, see the Gypsum Association’s overview of gypsum board. For a typical spec sheet that shows face/back colours, sizes, and edge options, check the British Gypsum WallBoard datasheet.
Standard Board: Face, Back, And Edges
Face And Back
Standard wallboard uses a gypsum core wrapped in paper liners. The front usually shows an ivory or light grey tone that takes paint or a skim coat. Flip it over and the back looks brown or kraft-like. Those two tones are an easy tell even on offcuts.
Edges And Ends
The long sides are designed to hide joints once taped. You’ll spot a gentle hollow running the full length: that’s the taper. The ends are cut square and clean, while the face paper folds around the long edges to protect the core. After installation, screws leave shallow dimples ready for compound.
Sizes And Thicknesses You’ll See
Common boards measure about 1200 by 2400 mm in the UK and 4 by 8 ft in North America, with longer sheets available for tall ceilings. The go-to thickness for walls is 12.5 mm (or 1/2 in). Edge options are either tapered for jointing or square for ceilings and skimming.
Colour Cues For Special Boards
Colour can signal special performance. Moisture-resistant boards often carry a green face. Fire-resistant boards from many brands use a pink face paper. Standard wallboard stays ivory on the front and brown on the reverse. On site, that quick splash of colour saves time when sorting stacks.
Moisture-Resistant Boards
In kitchens, bathrooms, and plant rooms you may see stacks with green faces on both sides. These look the same as regular boards in shape and edge form, but the core includes water-repellent additives. They still tape and finish like any other board.
Fire-Resistant Boards
Pink-faced boards signal enhanced fire performance. They install and finish like standard board, yet the core includes glass fibre and other additives. Some versions that also resist moisture carry pink on both sides.
On-Site: Before And After Finishing
Raw Installation
When boards first go up, you’ll notice screw lines running along studs at regular spacing. Long joints align where tapered edges meet; short joints look flat where square ends meet. Openings for sockets, switches, or downlights reveal a chalky white core at the cut edge.
Fixing Pattern
Fasteners sit slightly below the face without breaking the paper. After joint tape and the first pass of compound, those dimples fade. Light across the surface still shows them until sanding and the final coat.
Cut Edges And Openings
Machine-cut ends look neat; hand cuts show a crisp paper face with a white core behind it. Circular holes for services, and square or rectangle cuts for outlets, leave clean paper margins when done well.
Finished Surface
After taping and either a skim or compound finish, plasterboard turns into a single smooth plane. Under grazing light you might still trace joint bands until paint builds. Good sanding and a sound priming coat make the face read as one sheet.
What Does Plasterboard Look Like In A New Build?
Walk a new-build shell and you’ll spot wrapped pallets of board in sizes to match room heights. Labels ride the long edges; some makers print type marks along the face near an edge. Inside rooms, fixed boards show straight screw rows, taped seams, and protective corner beads on external angles.
Plasterboard Vs Similar Materials: Quick ID
A quick side-by-side check helps when you’re not sure what you’re seeing. Here’s how wallboard differs from wet plaster, cement board, and wood panels.
| Material | Surface Signs | Easy Checks |
|---|---|---|
| Plasterboard | Paper-faced sheet; tapered long edges; screw dimples | Cut edge shows a white gypsum core |
| Wet Plaster | Continuous trowel finish; no panel seams; no paper | Knockouts aren’t needed to pass wires through a sheet |
| Cement Board | Grey cementitious face; gritty feel; mesh at edges | Heavier; fasteners often use special screws and washers |
| OSB/Plywood | Visible wood flakes or grain; nail lines | Brown or yellow wood through the full thickness |
| Glass-Mat Gypsum | Fibreglass mat on the face; often green or purple | Mat texture is easy to spot at cutouts |
Care Cues When Viewing
When you evaluate a finished room, small signs tell you how the board sits behind the paint. Look for even joints with no ridges, no popped screws, and no scuffs that expose the paper. Near baths and showers, watch for green board behind tile zones or check that a moisture-ready lining was used.
Lighting And Flatness
Shine a light along a wall and you’ll read the plane. Minor shadow bands at joints can appear before the final coat of paint. A steady, level surface with tight corners points to careful jointing.
Edges Near Openings
Around windows and doors, look for straight corner beads and smooth returns. The board should sit tight to frames, with neat sealant lines after decorating.
Telltale Marks
Smudged lines along studs, dings that expose paper fibres, or long screw pops hint at movement or rushed fixing. Brown stains point to past leaks; a warped patch often means the core took on water.
Simple Field Checks
Tap the face lightly: plasterboard rings dull and solid, while plywood gives a woody note. Run a hand across a joint band: a taper joint should feel shallow and wide, while a butt joint feels narrow. At a cutout, the chalky core confirms you’re not looking at wood or cement board.
Quick Recap
Standard boards show an ivory face, brown back, tapered long edges, and square ends. Green signals moisture resistance; pink flags fire resistance. Edge text and back stamps help you match type and size. Once taped and finished, the surface reads as a flat, continuous plane ready for paint or tile.