Hanging things on a GIB plasterboard wall is one of the most common DIY jobs in a Kiwi home, but use the wrong fixing and you risk a shelf or mirror crashing to the floor. The good news is that with a basic understanding of how plasterboard works and a few quality fixings, most homeowners can tackle this confidently. This guide walks you through the main options, how to choose the right one, and when to call in a pro.
Understanding What's Behind Your GIB Wall
Before you reach for a drill, it pays to know what you're working with. Standard GIB plasterboard in NZ homes is typically 10 mm or 13 mm thick, fixed to either timber framing (most common in houses built to NZS 3604) or steel framing (common in newer builds and apartments). Between the studs is hollow space — sometimes with insulation — and this is where choosing the right fixing really matters.
Use a stud finder (available from Bunnings or Mitre 10) or the old-fashioned knuckle-knock method to locate your studs, which are typically spaced at 400 mm or 600 mm centres.
Fixing Into a Timber Stud: The Strongest Option
If you can position your fixing into a timber stud, do it — this is by far the strongest approach and suitable for heavy items like large shelving units, TV brackets, and heavy mirrors.
- Use wood screws (coarse thread, at least 50–65 mm long) driven through the plasterboard and well into the stud.
- Pre-drill a pilot hole to avoid splitting the timber.
- For steel framing, use self-drilling wafer-head screws designed for metal stud — standard wood screws won't grip properly.
Hollow-Wall Fixings: When You Can't Hit a Stud
Sometimes your layout means you simply can't line up with a stud. That's where hollow-wall anchors come in. Here's a comparison of the most common types:
| Fixing Type | Best For | Approx. Load Capacity | Notes |
|---|---|---|---|
| Plastic plug & screw | Very light items (picture frames) | Low | Only use in stud or solid backing — poor in hollow GIB |
| Nylon toggle / butterfly anchor | Light to medium loads | Low–medium | Spreads load behind board; easy to install |
| Metal self-drilling anchor (e.g. Driva) | Medium loads, shelves, hooks | Medium | Drills straight in, no pre-drill needed |
| Plasterboard toggle bolt | Heavier items, curtain rods | Medium–high | Large toggle spreads load over wider area |
| Snap toggle / metal toggle | Heavier loads | Higher | Very secure; harder to remove |
Important: Always check the manufacturer's rated load for the specific fixing and board thickness. Never exceed the stated load rating, and factor in dynamic loads (e.g. a child pulling on a shelf).
Picture Hooks and Adhesive Options
For lightweight artwork and pictures, a simple adhesive picture hook or a hardened steel picture hook with a small nail at an angle can work well without damaging the wall significantly.
- Adhesive hooks (like Command strips) are great for renters or for walls where you want minimal damage, but check the weight rating carefully and follow the instructions precisely — NZ humidity can affect adhesion.
- Angled nail picture hooks are a classic option for frames up to a few kilograms.
Wet Areas and Special Situations
If you're hanging something in a bathroom or kitchen — near a shower, bath, or splashback — be aware that standard GIB is not suitable in wet areas. GIB Aqualine or similar moisture-resistant board should have been used in these zones under NZ Building Code clause E3. Use corrosion-resistant (stainless or galvanised) fixings in these areas to prevent rust staining and fixing failure.
How Much Weight Can a GIB Wall Take?
This is the question most homeowners ask. As a general rule:
- Into a timber stud: Can handle significant loads — suitable for most household items including large TVs and heavy shelving when properly fixed.
- Hollow-wall anchors: Capacity varies widely by product. Light to medium loads only — always check the product's rated capacity.
- Adhesive hooks: Strictly light duty; follow the pack rating.
For anything particularly heavy — like a large wall-mounted TV, a heavy bookshelf, or a wall-hung vanity — always fix into studs or consult a carpenter.
Step-by-Step: Installing a Hollow-Wall Anchor
- Mark your position with a pencil.
- Check for pipes and cables — use a detector or refer to WorkSafe NZ guidance on safe drilling near services.
- Drill the correct size hole as specified on the anchor packaging.
- Insert the anchor and tap flush with the wall surface if required.
- Drive the screw until snug — don't overtighten or you'll crush the plasterboard.
- Test before loading — give it a firm tug before hanging anything valuable.
When to Call a Professional
Some situations call for a qualified carpenter or builder — find one on tradedirectory.co.nz:
- Mounting a large wall-mounted TV or heavy shelving system where structural integrity matters.
- Installing wall-hung cabinetry in kitchens or bathrooms.
- Any work that involves cutting into or modifying framing — this may be restricted building work under the NZ Building Act, requiring a Licensed Building Practitioner (LBP).
- If you're unsure whether your wall contains electrical wiring or plumbing — never drill blind near services. Electrical work is restricted to licensed electricians registered with the EWRB, and plumbing to those registered with the PGDB.
Safety note: Always use a cable and pipe detector before drilling into any wall. Striking a live cable or water pipe can be dangerous and costly.