E3 Internal membrane (with a little E2

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  • Title: E3 Internal Membrane

  • Organization: Auckland Council

  • Date: Nov 24

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  • Course Objectives:

    • Identify areas within large commercial construction where impervious surfaces are required, both internal and external.

    • Understand installation requirements and limitations of products.

    • Comprehend requirements for accidental overflow, including containment and floor waste group (FWG) installation.

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  • Objective E3.1:

    • Safeguard people against:

      • Illness.

      • Injury.

      • Loss of amenity from internal moisture accumulation.

    • Protect household units and property from free water damage from adjacent units.

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  • Functional Requirement E3.2:

    • Construction must prevent:

      • Fungal growth and contaminant accumulation on linings.

      • Free water overflow penetrating adjoining household units.

      • Damage to building elements from moisture presence.

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  • Performance E3.3:

    • E3.3.1: Provide adequate thermal resistance, ventilation, and temperature control to:

      • Habitable spaces.

      • Bathrooms.

      • Laundries.

    • E3.3.2: Free water from accidental overflow must be disposed to avoid:

      • Loss of amenity.

      • Damage to property.

    • E3.3.3: Impervious and easily cleaned floor surfaces are required in:

      • Spaces containing sanitary fixtures/appliances.

    • Excludes communal non-residential, commercial, industrial, outbuildings.

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  • Performance Continued:

    • E3.3.4: Wall surfaces adjacent to sanitary fixtures must be impervious and easily cleanable.

    • E3.3.5: Surfaces that may be splashed or contaminated should also be impervious.

    • E3.3.6: Construction must prevent water splash from penetrating concealed spaces.

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  • Definitions:

    • Household Unit: Building used exclusively for residential purposes, occupied by one household.

    • Impervious: Not permitting moisture passage.

    • Sanitary Appliance: Equipment for sanitation, e.g., dishwashers.

    • Sanitary Fixture: Includes toilets, sinks, baths, etc.

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  • Water-stop:

    • Termination of waterproof membrane system preventing moisture passage beyond protected area.

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  • Acceptable Solution E3/AST Internal Moisture:

    • 1.0 Prevention of Fungal Growth: Construction must minimize internal condensation to avoid fungal growth.

    • Building paper requirements and insulation considerations outlined; details of acceptable construction techniques given.

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  • Areas Requiring Impervious Surfaces:

    • Defined by E3 performance requirements:

      • Kitchens

      • Toilets

      • Bathrooms

      • Internal pool rooms

      • Wash bays

      • Cleaner cupboards

      • Rubbish rooms

      • Bars

      • Laundries

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  • Overflow Regulations:

    • If a fixture could damage adjoining units, two options:

      • Containment and floor wastes meeting specific requirements.

      • Exemption for kitchen sinks/laundry tubs with integrated overflows.

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  • Non-requirements for Containment:

    • Does not apply for component/hose failures if attached directly to plumbing and not considered an accidental overflow.

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  • Containment Requirements (2.1.1):

    • Achieved through effective use of impervious floor coverings and consider preventive measures for adjoining units.

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  • Internal Wet-area Membrane Systems Requirements:

    • Compliance through adherence to IWAM Code of Practice ensuring waterproofing as per H3.3 guidelines in the NZBC.

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  • NZBC Performance Clause for Membrane Systems:

    • Free water from sanitary fixtures must be managed to avoid damage.

    • Installation of floor wastes in necessary locations only.

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  • Installation Requirements Continued:

    • Wall surfaces adjacent to sanitary fixtures must meet imperviousness and cleanability standards.

    • Surfaces should prevent splashing and allow for easy cleaning.

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  • Link to Code of Practice:

    • Access provided to the Internal wet-area Membrane Systems Code of Practice documentation.

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  • WMAI Membership List:

    • Lists ordinary and associate members involved in waterproofing solutions including manufacturers and service providers.

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  • Floor Waste Requirements:

    • Must install floor wastes in areas with expected water flow (e.g., showers) and specify slope where applicable.

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  • Water-stop Construction Guidelines:

    • Detailed drawing instructions for constructing effective water-stops in waterproofing systems, with specific location requirements.

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  • Sealant and Over-surface Finish Guidelines:

    • Instructions on sealing and waterproofing under cabinetry and finishes.

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  • Service Penetrations Requirements:

    • Waterproofing considerations for piped service penetrations with compliance guidelines provided.

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  • Illustrative Drawings:

    • Various figures showcasing the application of sound insulation and heating on slabs, providing examples of design and installation suggestions.

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  • Areas for Below Ground Tanking:

    • Identifies structures needing waterproofing strategies including:

      • Retaining walls

      • Lift pits

      • Pile caps

      • Ground levels.

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  • Common Products Overview:

    • Highlights availability and features of Allco waterproofing systems alongside its limitations.

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  • Additional Common Products:

    • Discusses the Nuralite and Bituthene products with compliance and appraisals noted.

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  • Final Common Products Mention:

    • Waterproofing Systems NZ and Bituflame products briefly noted with Branz appraisal.