Screw pops in GIB plasterboard are one of the most common complaints after a stopping job, and the good news is they're almost always preventable. They happen when a screw works its way back toward the surface — or was never set correctly in the first place — causing a bump or crack in the finished coating. Understanding why they occur is the key to stopping them for good.
Why Do GIB Screws Pop?
Screw pops are caused by one or more of the following:
- Screws driven too deep — If the screw breaks through the paper face of the GIB board, it loses holding strength and can move over time.
- Screws not driven deep enough — A proud screw head sits above the board surface and will telegraph through even a well-applied stopping coat.
- Timber framing movement — New timber frames in NZ homes contain moisture and will shrink as they dry out. This seasonal movement can push screws back toward the surface, especially in the first year or two after construction.
- Using the wrong screw type or length — GIB screws should be purpose-made bugle-head drywall screws. Using the wrong fastener increases the risk of pops.
- Insufficient fastener spacing — Too few screws means the board can flex, causing movement at fixing points.
Getting the Screw Depth Right
The correct technique is to drive each screw so the head sits just below the surface of the board — creating a small dimple in the paper face without breaking through it. This is called setting the screw. Most good-quality drywall screw guns or drill drivers with a depth-sensitive nose piece make this easier to achieve consistently.
A quick check: run your hand across the board. You should feel a slight dimple at each screw location, not a bump or a rough hole. If you can feel the screw head proud of the surface, it needs to go in further. If the paper is torn or the board is crumbling around the screw, it's gone too deep — drive a new screw about 50 mm away and leave the damaged one in place (don't remove it).
Refer to the GIB site for their fixing schedules, which specify correct screw sizes, spacing, and installation requirements for different board thicknesses and framing configurations.
How to Fix Existing Screw Pops
If you've already stopped and painted and a screw pop has appeared, here's how to repair it:
- Drive the screw in further using a drywall screwdriver — set it just below the surface. If the screw spins without biting, drive a new screw 50 mm away.
- Apply a skim of stopping compound over the dimple in thin coats, feathering it out well beyond the repair area.
- Allow each coat to dry fully before applying the next — rushing this step is a common cause of future cracking.
- Sand lightly between coats and finish flush with the surrounding surface.
- Prime the repair before repainting — bare stopping compound will flash through paint if not primed first. Resene and Dulux both offer suitable primers for plasterboard repairs.
Preventing Screw Pops During the Stopping Process
Follow these best-practice steps before you apply a single coat of stopping:
- Check every screw before stopping begins. Run your screwdriver over each one to confirm it's set correctly.
- Use the right stopping compound — a quality, purpose-made GIB stopping compound applied in thin, even coats will perform far better than thick, rushed applications.
- Allow adequate drying time between coats — in NZ's more humid regions (Northland, West Coast, Southland winters), drying times can be significantly longer than on the packet.
- Control the environment — good ventilation and moderate temperature help stopping dry evenly and reduce the risk of shrinkage cracking.
- Don't over-sand — sanding through the paper face of the board weakens it and can cause future problems.
Framing Movement and New Builds
In new NZ homes built with green (unseasoned) timber framing, some degree of screw popping in the first 12–24 months is not unusual. As the timber dries and shrinks, it can push fixings outward. This is a known issue and is worth discussing with your builder or plasterer before handover. BRANZ has useful technical guidance on timber movement and its effects on linings.
If you're experiencing widespread or recurring pops across a whole wall or ceiling, it may point to a framing or fixing issue rather than a stopping problem — worth investigating before simply repairing the surface.
Tools and Materials You'll Need
| Item | Purpose |
|---|---|
| Drywall screwdriver or drill with depth nose | Setting screws correctly |
| GIB stopping compound | Filling dimples and repairs |
| Broad knife / spatula (150–250 mm) | Applying and feathering compound |
| Fine sandpaper (120–180 grit) | Sanding between coats |
| Plasterboard primer | Sealing repairs before painting |
You'll find most of these at Bunnings, Mitre 10, or PlaceMakers.
When to Call a Professional
If you're seeing widespread screw pops across multiple walls or ceilings, or if the pops keep returning after repair, it's time to bring in a qualified plasterer. Persistent popping can indicate underlying framing issues, incorrect board installation, or moisture problems that need professional assessment. A licensed plasterer will also be able to achieve a Level 4 or Level 5 finish (as defined in GIB's stopping guide) that's very difficult to match with DIY repairs. You can find experienced local plasterers on tradedirectory.co.nz.
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