You can use fibreglass mesh tape on GIB plasterboard joins, but it isn't always the best choice — and in some situations, paper tape is strongly preferred by professional plasterers. Understanding the difference between the two will help you get a smooth, crack-free result that stands the test of time.
What's the Difference Between the Two Tapes?
Paper tape is a thin, slightly flexible paper strip that is embedded into a layer of wet stopping compound (also called joint compound or base coat). It creates a very strong mechanical bond and resists cracking under stress, making it the go-to choice for most professional plasterers working with GIB plasterboard systems.
Fibreglass mesh tape (also called alkali-resistant or AR mesh tape) is a self-adhesive woven tape that sticks directly to the board surface before compound is applied over the top. It's easier for beginners to handle because it doesn't require a bed coat underneath, but it has some important limitations.
Where Each Tape Works Best
| Joint Type | Paper Tape | Fibreglass Mesh Tape |
|---|---|---|
| Tapered (recessed) joins | ✅ Recommended | ⚠️ Acceptable with care |
| Butt joins (flat edges) | ✅ Strongly recommended | ❌ Not ideal |
| Internal corners | ✅ Best choice | ❌ Not recommended |
| External corners | ✅ With corner bead | ✅ With corner bead |
| Repairs / small patches | ✅ Good | ✅ Convenient |
Tapered Joins
Most GIB boards have a recessed taper along their long edges. This recess gives you room to bed tape and apply compound flush with the board face. Both tape types can work here, but paper tape — properly embedded in a base coat — produces a flatter, stronger result with less risk of cracking over time.
Butt Joins
Butt joins occur where the square-cut ends of two boards meet. These are the most difficult joins to finish because there's no recess to hide the tape and compound. Paper tape is strongly preferred here because it's thinner and lies flatter, making it easier to feather out the compound without creating a noticeable hump. Mesh tape adds extra thickness and can telegraph through the finished surface.
Internal Corners
Internal corners (e.g., where a wall meets a ceiling) should always be finished with paper tape. Mesh tape is too rigid to fold cleanly into a corner and is prone to cracking as the building moves — which all NZ timber-framed homes do, especially in areas with seismic activity. GIB's own technical literature specifies paper tape for internal angles.
Why Fibreglass Mesh Tape Can Cause Problems
Fibreglass mesh tape has an open weave structure, which means it requires more compound to fill the gaps in the mesh. This extra build-up can lead to:
- Cracking — the thicker compound layer is more prone to shrinkage cracks as it dries
- Humping — a visible ridge over the join, especially on butt joins
- Delamination — if the wrong compound is used or the tape isn't fully embedded
To minimise these risks with mesh tape, always use a setting-type compound (one that hardens chemically rather than just drying) rather than a standard air-dry compound. Setting compounds are stronger and shrink less. Check with your local Mitre 10 or PlaceMakers for suitable products.
The Professional Approach
Most experienced NZ plasterers use paper tape as their default for all flat joins and corners, reserving mesh tape for small patch repairs where its self-adhesive convenience saves time. If you're stopping a whole room or a new GIB installation, investing the extra effort to learn paper tape technique will give you a noticeably better result.
The basic paper tape process:
- Apply a thin bed coat of stopping compound over the join
- Press the paper tape into the wet compound using a broad knife, smoothing out bubbles
- Apply a thin skim coat over the tape and allow to dry fully
- Sand lightly and apply one or two finish coats, feathering edges wide
Always follow the GIB stopping system guidelines for the specific board type you're using, as recommendations can vary between standard GIB, GIB Aqualine, and other specialist boards.
NZ Building Code Considerations
Internal wall and ceiling linings in NZ must comply with the NZ Building Code, particularly Clause E3 (Internal Moisture) and Clause F2 (Hazardous Building Materials). While the choice of tape itself isn't directly regulated, the overall lining system — including stopping and finishing — must perform as intended. In wet areas like bathrooms, GIB Aqualine boards with appropriate waterproofing systems are required; always check with your local council if you're unsure whether your project needs a building consent.
For most standard interior stopping work, no building consent is required, but confirm this with your council as Schedule 1 exemptions can depend on the scope of work.
When to Call a Professional
If you're tackling a large GIB installation, finishing a new build, or working in a high-visibility area like a living room ceiling, it's worth getting a qualified plasterer involved. Poor stopping is very hard to hide once painted, and fixing humps or cracks after the fact is time-consuming. A skilled tradesperson will also know which products and techniques suit your specific NZ climate conditions — humidity and temperature affect drying times significantly.
You can find qualified local plasterers on tradedirectory.co.nz to get the job done right first time.
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