Marshall Innovations Offer Weathertight Solutions for New Learning Environments

The Ministry of Education have recently made some key changes to the requirements for architects when designing new school buildings. The updated requirements promote:

More robust and cost-effective buildings
Less maintenance over the building’s life
Simple and straight forward building forms
Elimination of costly poor performing building materials and systems

As a nationwide supplier of weathertight building products, Marshall Innovations want to illustrate how and where various Marshall Innovations Construction Solutions are suitable for use in new learning environments.

Firstly, where the new requirements differ from the previous 2014 edition it is clearly noted that rigid air barrier board is mandatory for external cavity framed walls. This alleviates the option of a flexible wall underlay, however ‘Super-Stick’ Flexible Flashing tape (generally used for weathertight treatment around window and door openings) can also be used for fibre cement sheet joins, including JH RAB board. In this situation Super-Stick tape has been tested (as a system) and is also BRANZ Appraised.

Secondly, Marshall Innovations’ Trade-Seals — specifically designed for sealing around service penetrations through (flexible and) rigid-type wall underlays, are confirmed as suitable for use. Trade-Seals are a one-piece, self-adhesive collar available in in a large range of sizes from 8mm up to 220mm, used for sealing around pipe or conduit. Trade-Seals protect against damage to building insulation, framing structure, internal linings etc. from water penetration (in the event of external cladding failure) through the building ‘envelope’, by keeping water out and maintaining internal dryness.

Thirdly, Marshall's new HYDRA Roof Underlay — which has recently been introduced to the NZ market, for secondary protection against water penetration through roof cladding, carries a very current BRANZ Appraisal # 1071 (2019) — a specific design requirement of the MOE with regard to Metal Roofing – Underlay.

Although many Roof Underlays such as HYDRA are considered ‘self-supporting’, this product must still be fully supported by mesh regardless of purlin spacing. HYDRA Roof Underlay is a tri-laminate, non-woven, synthetic which is absorbent, and has excellent water resistance.

Further design requirements are Roof Underlay must have side and end laps of 150mm (or as per manufacturers requirements), be laid horizontally (except for roofs greater than 8 degrees), and have all penetrations, junctions, and laps sealed with a compatible window sealing tape — Super-Stick tape is also compatible for use with HYDRA Roof Underlay.

The Weathertightness Design Requirements apply to all new state school buildings, including:

Extensions and additions that increase the building footprint.
Projects that involve end-of-life replacement or the alteration of roof or wall cladding envelopes of existing buildings

HYDRA Roof Underlay

Marshall Innovations

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HYDRA is a heavy duty, spun-bonded, self-supporting, fire retardant, non woven fabric, laminated with a breathable coating for use under roof claddings.

HYDRA Roof Underlay has been appraised for use as a roof underlay on buildings within the following scope:

the scope limitations of NZBC Acceptable Solution E2/AS1 Para 1.1 with regards to building height and floor plan area; and
with masonry tile roof cladding; or,
with metal tile and profile metal roof cladding; and
situated within NZS3604 Wind Zones up to and including Extra High.

HYDRA Roof Underlay has also been approved for use on buildings subject to specific weathertightness design. Building designers are responsible for building design and for the incorporation of HYDRA roof underlay into their design in accordance with the declared properties and the instructions of Marshall Innovations Ltd.

Extra High Wind Zone

In the opinion of BRANZ, HYDRA Roof Underlay, if designed, used, installed and maintained in accordance with the statements and conditions of Appraisal 1071 [2019], will meet, or contribute to meeting the following provisions of the NZBC:

Clause B2 DURABILITY: Performance B2.3.1 (a), not less than 50 years, B2.3.1 (b) 15 years and B2 .3.2 HYDRA Roof Underlay will contribute to meeting this requirement
Clause E2 EXTERNAL MOISTURE: Performance E2.3.2. When used as part of the roof cladding system, HYDRA Roof Underlay will contribute to meeting this requirement
Clause F2 HAZARDOUS BUILDING MATERIALS: Performance F2.3.1. HYDRA Roof Underlay meets this requirement and will not present a health hazard to people

See Appraisal for full information

Durability

External Moisture

Hazardous Building Materials

Trade Seals

Marshall Innovations

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A range of EPDM collars with self adhesive backing.

Trade-Seals have been appraised for use as a pipe and service penetration seals for use where the pipes and service penetrations penetrate the wall underlay on timber framed buildings within the following scope.

the scope limitations of NZBC Acceptable Solutions E2/AS1, Paragraph 1.1: and,
with BRANZ Appraised flexible and rigid wall underlays; and,
situated in NZS 3604 Building Wind Zones up to, and including 'Extra High'

Trade-Seals have been appraised for use as a pipe and service penetration seals for use where the pipes and service penetrations penetrate the wall underlay on steel framed buildings within the following scope.

the scope limitations of NZBC Acceptable Solutions E2/AS1, Paragraph 1, with regards to building height and floor plan area; and,
with BRANZ Appraised flexible and rigid wall underlays; and,
situated in NZS 3604 Building Wind Zones up to, and including 'Extra High'

Trade-Seals have also been appraised for use on buildings subject to specific weather tightness design. Building designers are responsible for the building design and for incoporation of Trade-Seals into their design in accordance with the declared properties and the instructions of Marshall Innovations Limited.

Extra High Wind Zone

Trade Seals if designed, used, installed, and maintained in accordance with the BRANZ Appraisal No.719, will meet or contribute to meeting the following provisions of the NZBC:

B2 DURABILITY: Performance B2.3.1 (b), 15 years and B2.3.2. The TRADE-SEAL meets these requirements
E2 EXTERNAL MOISTURE: Performance E2.3.2. When used as part of the cladding system, Trade-Seals will contribute to meeting this requirement
F2 HAZARDOUS BUILDING MATERIALS: Performance F2.3.1. The Trade-Seal meets this requirement and will not present a health hazard to people

Durability

External Moisture

Hazardous Building Materials

BRANZ Appraised

SUPER-STICK Flashing Tape

Marshall Innovations

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SUPER-STICK is a flexible flashing tape used around framed joinery openings as a secondary weather resistant barrier.

SUPER-STICK has been appraised as a flexible flashing system for use around window and door joinery openings for buildings within the following scope:

the scope limitations of NZBC Acceptable Solution E2/AS1, Paragraph 1.1; and,
with a risk score of 0-20, calculated in accordance with NZBC Acceptable Solution E2/AS1, Table 2; and,
with wall cladding systems complying with NZBC Acceptable Solution E2/AS1 or a valid BRANZ Appraisal that specifies a flexible flashing tape system; and,
with wall underlays compatible with the flexible flashing tape; and, situated in NZS 3604 Wind Zones up to, and including, 'Extra High'.
SUPER-STICK has also been appraised as a flexible flashing system for use around window and door joinery openings for steel framed buildings

In the opinion of BRANZ, SUPER-STICK, if designed, used, installed and maintained in accordance with the statements and conditions of Appraisal No. 846 (2013), will meet or contribute to meeting the following provisions of the NZBC:

Clause B2 Durability: Performance B2.3.1 (b), 15 years and B2.3.2. SUPER-STICK meets these requirements.
Clause E2 External Moisture: Performance E2.3.2. SUPER-STICK contributes to meeting this requirement.
Clause F2 Hazardous Building Materials: Performance F2.3.1. SUPER-STICK meets this requirement and will not present a health hazard to people. SUPER-STICK has been appraised as an Alternative Solution in terms of New Zealand Building Code compliance.

Durability

External Moisture

Hazardous Building Materials

BRANZ Appraised

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