Designing to E3 Internal Waterproofing with GIB

It is best practice to use GIB Aqualine or GIB Toughline Aqua for watersplash areas with an impervious finish or within wet areas where it is finished with an impervious wall lining such as tiles, integrally waterproof sheet lining, or decorative high pressure laminate. This will also ensure the overall wall construction maintains its integrity longer when exposed more frequently to moisture and one-off events such as leaks or flooding.

Builder and homeowner Reade Wilson recently installed GIB Aqualine in his own bathroom at Wilson House.

“GIB Aqualine is my favourite drywall product," says Reade. "I've seen what can grow on (and in) other products. Yet GIB Aqualine has the ability to withstand humid environments and stay in mint condition."

"Part of my job is performing ongoing maintenance on the houses we're lucky enough to work on. As part of that maintenance, I sometimes see the damage water can do if it's not properly contained," says Reade. "GIB Aqualine gives me confidence that if a leak were to occur the GIB Aqualine could sustain the damage by not unnecessarily absorbing moisture and continue to do its job.”

A few things to note when using GIB Aqualine or GIB Toughline Aqua for bathrooms, kitchens and laundries:

You can’t tile over the plasterboard lining when installed over a GIB Rail or STWC Acoustic Clip (ST001).
Fastener centres to be maximum 150mm to perimeter of wall and all intermediate studs when walls are tiled.
When plasterboard lining is installed horizontally, a row of nogs is required behind the horizontal joint in showers or showers over bath situations.
Tiled internal corners of showers and showers over bath should have a minimum 32 x 32x 0.55mm galv. metal angle installed over the framing from floor to at least 1.8m high. This angle is not a flashing but is there to strengthen the corner and ensure the waterproof membrane does not crack (see image 3 above).
Maximum allowed tile weights are as per table in image 4 above. An allowance for tile adhesive and grout has been made in the calculation.

GIB Wet Area Systems

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Although able to cope with infrequent short-term exposure, standard gypsum plasterboard will have a shortened life expectancy when frequently exposed to water or moisture.

NZ Made

GIB Aqualine is ideal in situations where lining materials may be exposed more frequently to water or streams (particularly one-off events such as leakages or flooding of a room) because it features a water resistant wax polymer impregnated core.

Clause B1 Structure: The design and material specification for steel and timber framing used in GIB Aqualine systems must be in accordance with the performance requirements of NZBC Clause B1 (Structure).
Clause B2 Durability: When installed and maintained in accordance with this literature, GIB Aqualine tiled or vinyl covered systems have a serviceable life of at least 15 years. They comply with the requirements of NZBC Clause B2 for use in wet areas directly exposed to liquid water, e.g. showers, showers over baths and splash-backs. When used as a general wet area lining and maintained under normal dry internal conditions, GIB Aqualine systems have a serviceable life of at least 50 years and comply with NZBC Clause B2 for use within toilets, kitchens, bathrooms and laundries not directly exposed to liquid water.
Clause C3 Spread of Fire: GIB Fire Rated Systems provide passive fire protection in accordance with the requirements of NZBC Clause C3. When GIB Aqualine is substituted into fire rated systems in place of the equivalent thickness GIB Fyreline, the Fire Resistance Rating (FRR) of that system will be maintained.
Clause E3 Internal Moisture: When installed in accordance with this literature, tiled or vinyl covered GIB Aqualine systems may be used in areas directly exposed to liquid water, such as showers, to provide an impervious and easily cleaned wall surface.
Clause F2 Hazardous Building Materials: At no stage during handling, installation, or serviceable life does GIB Aqualine constitute a health hazard. It therefore meets the provisions of NZBC Clause F2.
Clause G6 Airborne and Impact Sound: GIB Noise Control Systems can be used to provide ratings for Sound Transmission Class (STC) and Impact Insulation Class (IIC) in accordance with the requirements of NZBC Clause G6.

All GIB unfinished plasterboard sheet materials achieve a Group 1-S interior fire rating to NZBC C/AS2-AS6, Table 4.1, following testing in accordance with ISO 5660.1 and ISO 5660.2.

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