Reducing Plastic Construction Material Waste

Construction waste is a major problem in New Zealand, but Kingspan Thermakraft are determined to be part of the solution. In the near future, they’ll expand the Thermakraft underlay product recycling programme to include a construction site waste take-back service.

In 2022, Kingspan Thermakraft diverted more than 29% of their manufacturing waste away from landfill, mostly by recycling synthetic underlays with similar materials. In 2023 this figure increased dramatically to more than 67%, as the recycling programme of synthetic underlays has advanced to include dissimilar materials.

Construction waste is a major environmental challenge in New Zealand, with the construction and demolition sector contributing up to 50%¹ of the country's total waste sent to landfill. To help address this colossal issue, Kingspan Thermakraft are planning to take their recycling programme a step further with a product take-back service from construction sites. The service will collect offcuts and part rolls of Thermakraft branded underlay from building sites and add them to the existing recycling programme. Customers will be advised as soon as the new take-back service is ready for roll out.

Through a proven recycling process, synthetic underlay scraps are shredded, remelted and transformed into regrind resin, which can be used for manufacturing various products, reducing the demand for virgin plastic. This initiative supports clients with strict waste management plans and contributes to a better circular economy.

The bigger picture: Kingspan’s Planet Passionate Programme

The product take-back service is part of Kingspan’s Planet Passionate programme, a 10-year global sustainability initiative aimed at tackling climate change, increasing circularity, and protecting the natural world. In New Zealand, Kingspan has set ambitious targets to reduce carbon emissions, energy and water usage, and increase waste recycling to promote circular economy practices. Looking to the future, Kingspan Thermakraft aims to establish local partnerships for recycling underlay products.

When you choose the Kingspan Thermakraft range of building underlays, you are joining the good fight against climate change and helping Kingspan Thermakraft to divert waste away from the landfills. Contact [email protected] to find out more about the development progress of the building underlays take-back service or read more about Kingspan’s approach to sustainability, innovation and performance at kingspan.com/about us

¹ Minimising Waste, (2024)

Thermakraft CoverTek 401 — Roof & Wall Underlay

Kingspan Thermakraft

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Covertek 401 is an affordable lightweight roof and wall underlay designed to keep water out and allow moisture to escape.

Roof Application:

Suitable with masonry tile, metal tile and profiled metal roof cladding.
Suitable for timber or steel framed buildings.
Self-supporting in roof pitch application greater than or equal a 10 degrees (Refer to installation guide)
Will provide temporary weather protection during construction (maximum 7 days), same day coverage recommended.
Covertek 401 may be installed during adverse conditions (rain/snow) without affecting durability or performance.
Suitable for use under dark coloured roofs.

Wall Application:

Can be used with timber and steel framing, either direct or in conjunction with an 18mm minimum drained cavity.
Suitable with absorbent (e.g. timber, brick or fibre cement) or non-absorbent wall claddings (e.g. metal or plastic).
Suitable with masonry veneer in accordance with NZBC Acceptable Solution E2/AS1 or NASH Building Envelope Solutions.
Is suitable for use in Wind Zones of NZS 3604 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.
Is suitable as an air barrier in unlined wall spaces.
Will provide some temporary weather protection during construction (maximum 60 days for wall application).

Refer BRANZ Appraisal No 943 (2021) for full details

Covertek 401 Roof Underlay, if used, designed, installed and maintained in accordance with the statements and conditions of the BRANZ Appraisal, 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. Covertek 401 Roof Underlay meets these requirements.
Clause E2 EXTERNAL MOISTURE: Performance E2.3.2. When used as part of the roof cladding system, Covertek 401 Roof Underlay will contribute to meeting this requirement.
Clause F2 HAZARDOUS BUILDING MATERIALS: Performance F2.3.1. Covertek 401 Roof Underlay meets this requirement and will not present a health hazard to people

BRANZ Appraised

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 CoverTek 405 — Roof & Wall Underlay

Kingspan Thermakraft

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Thermakraft CoverTek 405 is a fire retardant self supporting synthetic roofing underlay for use under all claddings.

Thermakraft CoverTek 405 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

Extra High Wind Zone

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 405 meets these requirements.

Clause E2 External Moisture: Performance E2.3.2. When used as part of the cladding system, Thermakraft CoverTek 405 will contribute to meeting this requirement.

Clause F2 Hazardous Building Materials: Performance F2.3.1. Thermakraft CoverTek 405 meets this requirement and will not present a health hazard to people.

Thermakraft CoverTek 405 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 Covertek 215

Kingspan Thermakraft

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Kingspan Thermakraft Covertek 215 is an economic, versatile lightweight roof underlay designed as a superior alternative to bituminous building paper when a fire-retardant underlay is NOT required.

Designed for use as a roof underlay 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
Situated in NZS3604 Wind Zones up to, and including, ‘Extra High’ (Roof only)

Refer BRANZ Appraisal No 1229 (2023) for full details.

Suitable with masonry tile, metal tile or profiled metal roof cladding
Suitable for timber or steel framed buildings — Direct fix or cavity fix
Self-supporting in roof pitch application greater than or equal to 10 degrees (Refer to installation guide)
Will provide temporary weather protection during construction (maximum 7 days), same day coverage recommended
Covertek 215 may be installed during adverse conditions (rain/snow) without affecting durability or performance
Suitable for use under dark coloured roofs

Covertek 215 Roof Underlay, if used, designed, installed and maintained in accordance with the statements and conditions of the BRANZ Appraisal, 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. Covertek 215 Roof Underlay meets these requirements. See Paragraphs 9.1 and 9.2
Clause E2 EXTERNAL MOISTURE: Performance E2.3.2. When used as part of the roof cladding system, Covertek 215 Roof Underlay will contribute to meeting this requirement. See Paragraphs 12.1 and 12.2
Clause F2 HAZARDOUS BUILDING MATERIALS: Performance F2.3.1. Covertek 215 Roof Underlay meets this requirement and will not present a health hazard to people

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

CodeMark

Thermakraft CoverTek 403 — Roof and Wall Underlay

Kingspan Thermakraft

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CoverTek 403 Roof and Wall underlay is a fire retardant, absorbent and breathable synthetic roof and wall underlay, constructed using a microporous water-resistant film sandwiched between two layers of shrink-resistant spun-bonded polyolefin.

Suitable for use as a roof underlay:

NZS 3604: when used as a roof underlay is suitable for use all wind zones, up to, and including, Very High
Suitable with masonry tile roof cladding
With metal tile and profiled metal roof cladding
Can be used as a roof underlay on roofs of 10 degrees pitch or greater. Requires support
Will provide temporary weather protection during construction (roofs 7 days) same day coverage recommended
May be installed in adverse conditions
May be run to any length, including under dark coloured roofs
Has a 150mm lap line printed on each edge

Suitable for use as a wall underlay:

NZS 3604: when used as standalone flexible underlay — up to, and including, Very High
NZS 3604: when used as a flexible underlay over a rigid wall underlay — up to, and including Extra High
Can be used as a wall underlay on timber and steel framed buildings with absorbent and non-absorbent wall cladding direct fixed to framing
Can be used as a wall underlay on timber and steel framed buildings with absorbent and nonabsorbent wall cladding installed over an 18mm minimum drained cavity
Will provide temporary weather protection during construction (walls maximum 42 days)
Can be used as a non-rigid backing material for stucco plaster
May be used as a slip layer over rigid backing for stucco
Is suitable as an air barrier in unlined walls

Very High WInd Zone

Clause B2 Durability: Performance B2.3.1 (a), not less than 50 years, B2.3.1 (b), 15 years and B2.3.2

Clause C3 Fire Affecting Areas Beyond The Fire Source: Performance C3.4 (c). Thermakraft CoverTek 403 Plus meets this requirement

Clause E2 External Moisture: Performance E2.3.2. When used as part of the cladding system, Thermakraft CoverTek 403 Plus will contribute to meeting this requirement

Clause F2 Hazardous Building Materials: Performance F2.3.1. Thermakraft CoverTek 403 Plus meets this requirement and will not present a health hazard to people

Thermakraft CoverTek 403 Roof and Wall 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

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