Page 1 of 5
PRODUCT CERTIFICATE
Thermakraft Covertek 405 Roof and Wall Underlay
1 CERTIFICATE HOLDER DETAILS ORIGINAL ISSUE DATE VERSION DATE RECERTIFICATION 2 PRODUCT CERTIFICATION BODY
Kingspan Insulation NZ Limited
11 Turin Place, Otara, Auckland.
info@kingspaninsulation.co.nz
Tel: +64 9 2733727
www.thermakraft.co.nz
29/06/2016 14/10/2022 01/07/2025 Global-Mark Pty Ltd
57 Willis Street, Wellington, 6011
customer.service@global-mark.co.nz
+64 9 889 0622
www.global-mark.co.nz
8 SIGNATURE
Herve Michoux, Global Mark Managing Director The complaints process for this certificate
can be found here:
https://www.global-mark.com.au/?s=complaint
This certificate is issued by an independent certification body accredited by JAS-ANZ, the product certification body appointed by the Chief Executive of the Ministry of Business, Innovation and Employment under the Building Act 2004.
This certificate may only be reproduced in its entirety. It is advised to check that this certificate is currently valid and not withdrawn or suspended by referring to the Register of Product Certificates on the Building Performance website http://www.building.govt.nz.
The purpose of construction site audits is to confirm the practicability of installing the product; and to confirm the appropriateness and accuracy of installation instructions. In issuing this certificate, Global-Mark has relied on the independent expert and/or laboratory advise or
reports. In placing the CodeMark mark on the product/system, the certificate holder makes a declaration of compliance with the certification standard(s) and confirms that the product is identical to the product certified herein.
CERTIFICATE V2
CERTIFICATE: CMNZ 30030
Version No: RevH
3 DESCRIPTION OF BUILDING METHOD OR PRODUCT
Thermakraft Covertek 405 Roof and Wall Underlay is a synthetic, fire retardant, absorbent, breathable building underlay for use under roof and wall claddings. The product consists of a micro-porous
water resistant film laminated between two layers of non woven spun-bonded polyolefin. Thermakraft Covertek 405 Roof and Wall Underlay is coloured white on the top and bottom faces with yellow
Covertek 405 branding on the exposed face.
4 INTENDED USE OF BUILDING METHOD OR PRODUCT
Thermakraft Covertek 405 Roof and Wall Underlay is an underlay for use under roof and wall claddings
5 NEW ZEALAND BUILDING CODE PROVISIONS
The performance clauses of the New Zealand Building Code that are relevant to the intended use and with which the building method or product complies or contributes to compliance:
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)
Clause E2 EXTERNAL MOISTURE: Performance E2.3.2, E2.3.5, E2.3.6 and E2.3.7 when used as part of the roof or wall cladding system.
Clause F2 HAZARDOUS BUILDING MATERIALS: Performance F2.3.1.
Page 2 of 5
PRODUCT CERTIFICATE
Thermakraft Covertek 405 Roof and Wall Underlay
This certificate is issued by an independent certification body accredited by JAS-ANZ, the product certification body appointed by the Chief Executive of the Ministry of Business, Innovation and Employment under the Building Act 2004.
This certificate may only be reproduced in its entirety. It is advised to check that this certificate is currently valid and not withdrawn or suspended by referring to the Register of Product Certificates on the Building Performance website http://www.building.govt.nz.
The purpose of construction site audits is to confirm the practicability of installing the product; and to confirm the appropriateness and accuracy of installation instructions. In issuing this certificate, Global-Mark has relied on the independent expert and/or laboratory
advise or reports. In placing the CodeMark mark on the product/system, the certificate holder makes a declaration of compliance with the certification standard(s) and confirms that the product is identical to the product certified herein.
CERTIFICATE V2
6 CONDITIONS AND LIMITATIONS OF USE
1. Thermakraft Covertek 405 Roof and Wall Underlay use certified
a. as self supporting roof underlay on buildings:
i. within the scope limitations of NZBC Acceptable Solution E2/AS1, Third Edition including amendment 10 (5 November 2020), Paragraph 1.1 with regards to building height
and floor plan area; and,
ii. with
1. masonry tile roof cladding; or,
2. with metal tile roof cladding or
3. profiled metal roof cladding; and,
iii. situated in NZS 3604-2011 and NASH Standard Part 2 Wind Zones up to, and including Extra High.
iv. with a roof pitch of 3° and above
b. as flexible wall underlay for buildings:
i. within the scope limitations of
1. NZBC Acceptable Solution E2/AS1, Third Edition including amendment 10 (5 November 2020), Paragraph 1.1 for timber-framed buildings; or,
2. NASH Building Envelope Solutions, Paragraph 1.1 for steel-framed buildings; and,
ii. with absorbent or non-absorbent wall claddings either direct fixed or installed over an 18 mm minimum drained cavity; or,
iii. with masonry veneer in accordance with
1. NZBC Acceptable Solution E2/AS1 Third Edition including amendment 10 (5 November 2020) for timber-framed buildings or
2. NASH Building Envelope Solutions for steel-framed buildings; and,
iv. situated in
1. NZS 3604 and NASH Standard Part 2 Wind Zones up to, and including, Very High; or,
2. NZS 3604 and NASH Standard Part 2 Wind Zones up to, and including, Extra High when used over a rigid wall underlay in accordance with NZBC Acceptable
Solution E2/AS1 Third Edition including amendment 10 (5 November 2020) or NASH Building Envelope Solutions Paragraph 9.1.7.2.
2. Thermakraft Covertek 405 Roof and Wall Underlay shall be used and installed in accordance with all relevant technical information relating to the products use contained within Kingspan -
Product data Sheet - Thermakraft Covertek 405 Self-supporting roof and wall underlay (Issue 6.0, September 2022) and Kingspan- Installation Guide - Thermakraft Covertek 405 Self- supporting roof and wall underlay (issue 3.0, September 2022) and the BRANZ Appraisal No. 743 (2019) Amended 23 September 2020 Thermakraft Covertek 405 Roof and Wall Underlay
(refer to www.branz.co.nz).
3. Thermakraft Covertek 405 Roof and Wall Underlay must not be exposed to the weather or ultraviolet light before being covered for a total of more than:
a. 7 days when used as a roof underlay
b. 60 days when used as a wall underlay.
4. Thermakraft Covertek 405 Roof and Wall Underlay must be separated or protected from heat sources such as fireplaces, heating appliances, flues and chimneys.
5. When used as a roof underlay,
a. Thermakraft Covertek 405 Roof and Wall Underlay can be installed vertically or horizontally and must span no greater than 1200 mm in one direction between framing supports
without additional underlay support. All underlay supports must be corrosion resistant material.
b. In addition, at roof pitch less than 10°, the underlay must be installed horizontally unless installed over a roof underlay support.
Page 3 of 5
PRODUCT CERTIFICATE
Thermakraft Covertek 405 Roof and Wall Underlay
This certificate is issued by an independent certification body accredited by JAS-ANZ, the product certification body appointed by the Chief Executive of the Ministry of Business, Innovation and Employment under the Building Act 2004.
This certificate may only be reproduced in its entirety. It is advised to check that this certificate is currently valid and not withdrawn or suspended by referring to the Register of Product Certificates on the Building Performance website http://www.building.govt.nz.
The purpose of construction site audits is to confirm the practicability of installing the product; and to confirm the appropriateness and accuracy of installation instructions. In issuing this certificate, Global-Mark has relied on the independent expert and/or laboratory
advise or reports. In placing the CodeMark mark on the product/system, the certificate holder makes a declaration of compliance with the certification standard(s) and confirms that the product is identical to the product certified herein.
CERTIFICATE V2
6. When used as a wall underlay, in cavity installations where the cavity battens are installed at greater than 450 mm centres, Thermakraft Covertek 405 Roof and Wall Underlay must be
restrained between the battens to prevent the underlay bulging into the cavity space when bulk insulation is installed in the wall frame cavity.
7 HEALTH AND SAFETY INFORMATION
Standard industry safety practices and manufacturer safety requirement as detailed in the technical literature including the applicable SDS must be observed at all times.
When fixing the product in windy conditions, care must be taken due to the large sail area created.
9 BASIS FOR CERTIFICATION
The certification decision is based on independent technical review(s) of test report(s), engineering opinion(s) and other documented evidence(s), factory audit(s) and site review(s)
Code Clause Compliance pathway Evidence
B2 DURABILITY Alternative solution -Expert judgement 001, 002, 003 and 004
C3 FIRE AFFECTING AREAS BEYOND THE SOURCE Acceptable solution – Test report 001, 002, 003 and 004
E2 EXTERNAL MOISTURE Alternative solution -Expert judgement 001, 002, 003 and 004
F2 HAZARDOUS BUILDING MATERIALS Alternative solution -Expert judgement 001, 002, 003, 004 and 005
10 SUPPORTING DOCUMENTATION FOR CERTIFICATION
Ref Author Title Date and/or revision
001 BRANZ Thermakraft Covertek 405 Roof and Wall Underlay - BRANZ Appraisal No. 743 (2019) Amended 23 September 2020 23 September 2020
002 * BRANZ BRANZ Appraisals Means of Compliance – Basis of Appraisal - Thermakraft Covertek 405 Roof and Wall Underlay BRANZ Appraisal
No. 743 (2019)
TV08005-005
003 Kingspan Product data Sheet - Thermakraft Covertek 405 Self-supporting roof and wall underlay Issue 6.0, September 2022
004 Kingspan Installation Guide - Thermakraft Covertek 405 Self-supporting roof and wall underlay Issue 3.0, September2022
005 Kingspan Thermakraft Covertek Safety Data Sheet Issue 4.0, August 2022
* This document was provided commercial in confidence and is not publicly available.
Page 4 of 5
PRODUCT CERTIFICATE
Thermakraft Covertek 405 Roof and Wall Underlay
This certificate is issued by an independent certification body accredited by JAS-ANZ, the product certification body appointed by the Chief Executive of the Ministry of Business, Innovation and Employment under the Building Act 2004.
This certificate may only be reproduced in its entirety. It is advised to check that this certificate is currently valid and not withdrawn or suspended by referring to the Register of Product Certificates on the Building Performance website http://www.building.govt.nz.
The purpose of construction site audits is to confirm the practicability of installing the product; and to confirm the appropriateness and accuracy of installation instructions. In issuing this certificate, Global-Mark has relied on the independent expert and/or laboratory
advise or reports. In placing the CodeMark mark on the product/system, the certificate holder makes a declaration of compliance with the certification standard(s) and confirms that the product is identical to the product certified herein.
CERTIFICATE V2
11 SUPPORTING INFORMATION ABOUT DESCRIPTION (OPTIONAL)
Thermakraft Covertek 405 Roof and Wall Underlay is supplied in rolls 1.250 m wide x 20m and 40 m long and 2.550m wide x 29.4m long. The product is printed with the Thermakraft Covertek 405
logo repeated along the length of the roll. The rolls are wrapped in clear polythene film.
Accessories used with Thermakraft Covertek 405 Roof and Wall Underlay which are supplied by the installer are:
• Fixings - stainless steel staples, clouts, screws or proprietary underlay fixings, or other temporary fixings to attach the roof underlay to the framing.
• Wall underlay restraint (timber frame) – polypropylene strap, 75 mm galvanised mesh or galvanised wire, or vertical cavity battens where required to restrain the wall underlay in accordance
with NZBC Acceptable Solution E2/AS1, Third Edition including amendment 10 (5 November 2020), Paragraph 9.1.8.5.
• Wall underlay restraint (steel frame) – polypropylene strap, 75 mm galvanised mesh or galvanised wire, or vertical cavity battens where required to restrain the wall underlay in accordance with
NASH Building Envelope Solutions, Paragraph 9.1.9.5.
• Thermal break sheathing (steel framing) – in accordance with NASH Building Envelope Solutions, Paragraph 11.4.3.2.
Thermakraft Covertek 405 Roof and Wall Underlay has an AS 1530 Part 2 – 1993 (including Amendment 1) flammability index of not greater than 5 and therefore meets the requirements of NZBC
Acceptable Solutions C/AS2 amendment 2 (05 November 2020), 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.
12 SUPPORTING INFORMATION ABOUT INTENDED USE (OPTIONAL)
Thermakraft Covertek 405 Roof and Wall Underlay is intended for use as an alternative to conventional kraft paper roof and wall underlays. Thermakraft Covertek 405 Roof and Wall Underlay is
suitable for use under wall claddings as a wall underlay on timber-framed buildings and on steel-framed buildings, including non-absorbent wall claddings such as vinyl and metal-based weatherboards
in direct fixed situations.
Thermakraft Covertek 405 Roof and Wall Underlay is suitable for use as an air barrier where walls are not lined, such as attic spaces at gable ends, in accordance with NZBC Acceptable Solution E2/AS1
or NASH Building Envelope Solutions, Paragraph 9.1.4 (c).
The material also provides a degree of temporary weather protection during early construction but the product will not make the building weathertight. Some wetting of the underlying structure is
always possible before the cladding is installed. Hence, the entire building must be closed in and made weatherproof before moisture sensitive materials such as ceiling linings and insulation materials
are installed.
13 SUPPORTING INFORMATION ABOUT CONDITIONS AND LIMITATIONS OF USE (OPTIONAL)
General
• Part 7 of NZBC Acceptable Solutions C/AS2 amendment 2 (05 November 2020), and NZBC Verification Method C/VM1 (Amendment 4 (1 January 2017) provide methods for separation and
protection of combustible materials from heat sources.
• Any damaged areas of Thermakraft Covertek 405 Roof and Wall Underlay, such as tears, holes or gaps around service penetrations, must be repaired. Damaged areas can be repaired by covering
with new material lapping the damaged area by at least 150 mm and taping, or by taping small tears.
When used as a Roof underlay:
• Thermakraft Covertek 405 Roof and Wall Underlay must be fixed at maximum 300 mm centres to all framing members with large-head clouts 20 mm long, 6-8 mm stainless steel staples, self- drilling screws or proprietary underlay fixings. The membrane must be pulled taut over the framing before fixing.
Page 5 of 5
PRODUCT CERTIFICATE
Thermakraft Covertek 405 Roof and Wall Underlay
This certificate is issued by an independent certification body accredited by JAS-ANZ, the product certification body appointed by the Chief Executive of the Ministry of Business, Innovation and Employment under the Building Act 2004.
This certificate may only be reproduced in its entirety. It is advised to check that this certificate is currently valid and not withdrawn or suspended by referring to the Register of Product Certificates on the Building Performance website http://www.building.govt.nz.
The purpose of construction site audits is to confirm the practicability of installing the product; and to confirm the appropriateness and accuracy of installation instructions. In issuing this certificate, Global-Mark has relied on the independent expert and/or laboratory
advise or reports. In placing the CodeMark mark on the product/system, the certificate holder makes a declaration of compliance with the certification standard(s) and confirms that the product is identical to the product certified herein.
CERTIFICATE V2
• The roof underlay must extend from the ridge and overhang the fascia board by 20-25 mm .
• Vertical laps must be no less than 150 mm wide. Horizontal laps must also be no less than 150 mm, with the direction of the lap ensuring that water is shed to the outer face of the underlay. End
laps must be made over framing and be no less than 150 mm wide. To assist with achieving the correct lap dimension, Thermakraft Covertek 405 Roof and Wall Underlay has a 150 mm lap line
printed continuously along the top face.
When used as a wall underlay:
• Thermakraft Covertek 405 Roof and Wall Underlay must be run horizontally and must extend from the upper-side of the top plate to the under-side of the bearers or wall plates supporting
ground floor joists, or below bottom plates on concrete slabs. Horizontal laps must be no less than 150 mm wide, with the direction of the lap ensuring that water is shed to the outer face of the
underlay. End laps must be made over framing and be no less than 150 mm wide.
• Thermakraft Covertek 405 Roof and Wall Underlay should be run over openings and these left covered until windows and doors are ready to be installed. Openings are formed in the underlay by
cutting on a 45 degree diagonal from each corner of the penetration. The flaps of the cut underlay must be folded inside the opening and stapled to the penetration framing. Excess underlay may
be cut off flush with the internal face of the wall frame.
• Thermakraft Covertek 405 Roof and Wall Underlay can be added as a second layer over head flashings in accordance with the requirements of NZBC Acceptable Solution E2/AS1, Paragraph
9.1.10.3 for timber framing or NASH Building Envelope Solutions Paragraph 9.1.11.3 for steel framing.
• NZBC Acceptable Solution E2/AS1 Third Edition including amendment 10 (5 November 2020), Paragraph 9.1.8.5 for timber frame or NASH Building Envelope Solutions, Paragraph 9.1.9.5 for steel
frame provide information on Wall underlay restraint options include polypropylene strap, 75 mm galvanised mesh or galvanised wire, vertical cavity battens or thermal break sheathing (steel
frame only).
End of document