Specify Thermakraft Integrated Solutions to Create a Weathertight Building Envelope

Waikato Master Builders Supreme House of the Year 2020, and winner of the coveted Workmanship Award twice over, the go-to for Craig Wallace’s team of CJW Build is an envelope created with Thermakraft product. Craig chooses Thermakraft because they “never have any quality issues, supply is always readily available and it’s great to work with."

CJW Build works with leading architects and designers. The homes are avant garde, featuring multiple claddings and architecturally designed windows and roofs. The builds are complex, and the envelope tends to be left open to the elements for longer. Craig points out that their preferred Thermakraft products have “lengthy exposure ratings and do not deteriorate or damage when exposed" and the new flashing tape (Thermaflash) is "perfect for complex junctions and openings."

What does Craig typically see specified throughout these adventurous projects? “In the early stages, we would typically be using Thermathene Orange DPM. Supercourse 500 as a damp course. We use a lot of wide width Watergate Plus wall underlay. One of our current builds has four different types of exterior claddings, ACM, brick, cedar, and aluminium and Watergate Plus can be used with any of these claddings."

Craig continues, “On the roof we see a lot of Covertek 407.” As for Craig's favourite Thermakraft product? “OneSeal, they’re so good and easy to use. We don’t need to tape around each penetration.”

Thermakraft recommends that this type of complex build might also include Drainage Mat when a ventilation and drainage layer is required and Vapour Shield, a vapour control or barrier layer used in Skillion roof construction.

Using an integrated product solution keeps it simple: one system, one warranty. Thermakraft’s target is clear, keeping New Zealand homes drier, safer and healthier.

Thermakraft One Wrap System

Kingspan Thermakraft

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The Thermakraft flexible wall membrane system is a multi-product integrated system design to assist with the passive control of air and moisture in buildings constructed in compliance with NZS3604:2011 and the requirements of all relevant compliance documents.

The Thermakraft One Wrap System is used behind wall cladding systems and around framed joinery openings as a secondary weather resistant barrier for walls.

System has been appraised for use a s flexible wall underlay system:

On timber and steel framed buildings
Over rigid wall underlays on timber and steel framed buildings

See BRANZ appraisal for full scope

In the opinion of BRANZ, The Thermakraft One Wrap System, if designed, used, installed, and maintained in accordance with the statements and conditions of the Appraisal, will meet, or contribute to meeting the following provisions of the NZBC:

B2 Durability: Performance B2.3.1 (a), not less than 50 years, B2.3.1 (b), 15 years and B2.3.2. the Thermakraft One Wrap System meets these requirements.
E2 External Moisture: Performance E2.3.2. When used as part of the cladding system, Thermakraft One Wrap System will contribute to meeting this requirement.
F2 Hazardous Building Materials: Performance F2.3.1. The Thermakraft One Warp System meets this requirement and will not present a health hazard to people.

BRANZ Appraised

Thermakraft Thermaflash

Kingspan Thermakraft

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Thermaflash high adhesion synthetic window flashing tape is a high performance self-adhering synthetic tape.

Thermaflash window flashing tape can be used as a flexible flashing system around window and door joinery openings on timber and steel framed buildings within the following scope:

Installed into and around joinery openings over the wall underlay and exposed frame to cover both the face and edge of the opening as a secondary weather resistant barrier
Installed at joinery heads to seal flashing upstands to the wall underlay
To assist the overall weathertightness performance of window and door joinery installations
To be used in conjunction with air seals and joinery flashing systems. Installer must check for air seal product compatibility with Thermaflash
Situated in NZS3604 Wind Zones up to, and including, ‘Extra High’
Suitable for residential builds (E2/AS1 timber framed and E2/AS4 steel framed) and medium rise buildings (E2/VM2)

Thermaflash window flashing tape has been appraised by BRANZ as a flexible system for use around window and door joinery for buildings with the following scope:

Constructed with timber and steel framing in accordance with scope limitations of NZBC Acceptable Solution E2/AS1 and NASH Building Envelope Solutions, Paragraph 1.1
With a risk score of 0-20, calculated in accordance with NZBC Acceptable Solution E2/AS1 or NASH Building Envelope Solutions, Table 2
With wall cladding systems complying with NZBC Acceptable Solution E2/AS1 or NASH Building Envelope Solutions, or a valid BRANZ Appraisal that specifies a flexible flashing system
With flexible wall underlays compatible with the flashing tape and complying with the NZBC

Clause B2 DURABILITY: Performance B2.3.1 (b), 15 years and B2.3.2. Thermaflash Flashing Tape meets these requirements
Clause E2 EXTERNAL MOISTURE: Performance E2.3.2. Thermaflash Flashing Tape contributes to meeting this requirement
Clause F2 HAZARDOUS BUILDING MATERIALS: Performance F2.3.1. Thermaflash Flashing Tape meets this requirement and will not present a health hazard to people

BRANZ Appraised

Thermakraft Vapour Shield

Kingspan Thermakraft

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Vapour Shield is intended for use as a vapour barrier layer ideally for skillion roof construction where condensation and moisture vapour control as required behind internal cladding.

Underlayment for roof construction, where condensation and moisture control is required
Acts to keep sarking dry until roof is fixed
Acts as vapour control layer during serviceable life of roof
Can be laid either side up

Thermakraft Vapour Shield Moisture Control Barrier, if correctly installed, will meet the performance requirements of NZBC:

Clause B2, Durability (B2.3.1[a] 50 years), and B2.3.1 (b) 15 years
Clause E2, External Moisture

Thermakraft Thermathene Orange 300μm

Kingspan Thermakraft

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Thermakraft Thermathene Orange 300μm is a super high strength concrete underlay, tear resistant polythene film used as a damp proof membrane.

Thermathene Orange is intended for use as a dampproof membrane separating the concrete slab from ground soil. The product acts as a vapour barrier to stop ground moisture penetrating the concrete.

Thermathene Orange Concrete Underlay has been appraised for use as a DPM under concrete slab on-ground floors complying with NZS 3604 or NZS 4229.

Thermathene Orange Concrete Underlay has also been appraised for use as a DPM on buildings subject to specific design within the following scope:

Where the DPM is laid on a granular base prepared to not damage the DPM; and,
Where the DPM is adequately protected against damage in service

Thermathene Orange is an Acceptable Solution as per the requirements of the NZBC. Thermathene Orange meets the requirements of NZBC 3604:2011 Clause 7.5.4.2, NZBC Acceptable Solutions E2/AS1, Table 23 and NZS 4229:2013 Clause 7.4 & 7.6.

When Thermathene Orange is used and installed as a damp-proof membrane as per Thermakraft’s literature, the product will meet or contribute to meeting the following provisions of the NZBC: Clause B2 Durability: Performance B2.3.1 (a), 50 years, Clause E2 External Moisture: Performance E2.3.3 & Clause F2 Hazardous Materials: Performance F2.3.1.

BRANZ Appraised

Thermakraft Watergate Plus

Kingspan Thermakraft

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Thermakraft Watergate Plus is a fire retardant absorbent breathable wall underlay.

Thermakraft Watergate Plus can be used as a wall underlay on timber and steel framed buildings within the following scope:

The scope limitations of NZBC Acceptable Solution E2/AS1, Paragraph 1.1, with regards to building height and floor plan area; and,
With absorbent wall claddings directly fixed to timber and steel framing; and,
With non-absorbent wall claddings directly fixed to timber and steel framing; and,
With absorbent and non-absorbent wall claddings installed over an 18mm minimum drained cavity;
With masonry veneer in accordance with NZS 3604, NZBC Acceptable Solution E2/AS1 for timber framed buildings, or specific engineering design for steel framed buildings; and,
Situated in NZS3604 Building Wind Zones up to, and including ‘Very High’ when used as a standalone flexible underlay, and “Extra High” when used as a flexible underlay over a rigid wall underlay.
Can be used as a non-rigid backing material for Stucco Plaster in accordance with the requirements of NZBC Acceptable Solution E2/AS1 Paragraph 9.3.5.1.
The Underlay must be supported with 75mm galvanized mesh, or Thermakraft Stud Strap at 150mm centres run across cavity battens to limit deflection to a maximum of 5mm.
May also be used as a slip layer over rigid backing for Stucco Plaster in accordance with the requirements of NZBC E2/AS1 Paragraph 9.3.3(b).
Refer BRANZ Appraisal No 695 (2017) for full details.
May be used with LOSP treated timber.
Is suitable as an air barrier in unlined wall spaces.
Is suitable to be used in conjunction with thermal breaks on steel framed buildings.
Is suitable for direct fixing behind metal cladding

Meets the Performance Requirements of NZBC Clauses B2, Durability (B2.3.1 (a) 50 years, B2.3.1 (b) 15 years and B2.3.2), E2 External Moisture (E2.3.2), and F2 Hazardous Building Materials F2.3.1, providing

It is not damaged
Installed in accordance with instruction guide
Is not left exposed for more than 90 days
Installed by or under guidance of Licensed Building Practitioners
Is compatible with cladding system used

BRANZ Appraised

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Thermakraft CoverTek 407 — Roof & Wall Underlay

Kingspan Thermakraft

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Thermakraft CoverTek 407 is a fire retardant self supporting synthetic building underlay for the use under all claddings.

Thermakraft CoverTek 407 Fire Retardant Self-Supporting Roof Underlay has been appraised for use as a self-supporting roof underlay on buildings within the following scope:

The scope limitations of NZBC Acceptable Solutions E2/AS1, Paragraph 1.1 with regards to building height and floor plan area; and,
With masonry tile roof cladding; and,
With metal tile and profiled metal roof cladding; and,
Situated in NZS 3604 Wind Zones up to, and including Extra High

Clause B2 Durability: Performance B2.3.1 (a), not less than 50 years, B2.3.1 (b), 15 years and B2.3.2. Thermakraft CoverTek 407 meets these requirements.

Clause E2 External Moisture: Performance E2.3.2. When used as part of the cladding system, Thermakraft CoverTek 407 will contribute to meeting this requirement.

Clause F2 Hazardous Building Materials: Performance F2.3.1. Thermakraft CoverTek 407 meets this requirement and will not present a health hazard to people.

Thermakraft CoverTek 407 Roof Underlay has an AS 1530 Part 2 flammability Index of not greater than 5 and therefore meets the requirements of NZBC Acceptable Solutions C/AS2 to C/AS6, Paragraph 4.17.8 b), for the surface finish requirements of suspended flexible fabric used as an underlay to exterior cladding that is exposed to view in occupied spaces. It may therefore be used with no restrictions in all buildings.

BRANZ Appraised

CodeMark

Thermakraft OneSeal Multi-fit Pipe and Cable Penetration Seals

Kingspan Thermakraft

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OneSeal Multi-fit Pipe and Cable Penetration Seals are a range of pipe and service penetration seals consisting of a soft, flexible EPDM membrane with a self-adhesvive flange.

OneSeal Multi-fit Pipe and Cable Penetration Seals have been appraised for use as pipe and service penetration seals for use where the penetration penetrates the wall underlay on timber and steel framed buildings within the following scope:

the scope limitations of NZBC Acceptable Solutions E2/AS1, Paragraph 1.1 with regards to building height and floor plan area; and,
with stand-alone flexible wall underlays covered by a valid BRANZ Appraisal; or,
with flexible wall underlays covered by a valid BRANZ Appraisal for use over rigid wall underlays; or,
with proprietary plywood or fibre cement based rigid wall underlays cover by a valid BRANZ Appraisal; and,
situated in NZS 3604 Wind Zones up to, and including Very High where stand-alone flexible wall underlays are used; or,
situated in NZS 3604 Wind Zones up to, and including Extra High where flexible wall underlays are used over rigid wall underlays, or proprietary rigid wall underlays are used.

OneSeal Multi-fit Piep and Cable Penetration Seals have also been appraised for use on buildings subject to specific weathertightness design. Building designers are responsible for the building design and for the incorporation of Multi-Fit Penetration Seals into their design in accordance with the declared properties and the instructions of Thermakraft Ltd

Clause B2 Durability: Performance B2.3.1 (b), 15 years and B2.3.2. Multi-Fit Penetration Seals meet these requirements.
Clause E2 External Moisture: Performance E2.3.2. When used as part of the wall cladding system, Multi-Fit Penetration Seals will contribute to meeting this requirement.
Clause F2 Hazardous Building Materials: Performance F2.3.1. Multi-Fit Penetration Seals meet this requirement and will not present a health hazard to people.

BRANZ Appraised

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