Description

1. SOLITEX EXTASANA ADHERO^® is a self-adhesive, synthetic underlay for use over rigid wall underlays under cavity or direct fixed wall claddings or over rigid sarking on pitched roofs.

2. SOLITEX EXTASANA ADHERO® Self-Adhesive Underlay is also suitable for use as a roof and wall underlay on Cross Laminated Timber (CLT) construction.

Scope

Use over E2/AS1 or NASH Building Envelope Solutions Rigid Wall Underlays

1. SOLITEX EXTASANA ADHERO® has been appraised for use as a flexible wall underlay when installed over fibre cement or plywood rigid wall underlays in accordance with NZBC Acceptable Solution E2/AS1 or NASH Building Envelope Solutions Paragraph 9.1.7.2 and when used on buildings within the following scope:

• the scope limitations of NZBC Acceptable Solution E2/AS1, Paragraph 1.1 for timber-framed buildings; or,
• the scope limitations of NASH Building Envelope Solutions, Paragraph 1.1 for steel-framed buildings; and,
• with a risk score of 0-20, calculated in accordance with NZBC Acceptable Solution E2/AS1 or NASH Building Envelope Solutions, Table 2; and,
• with absorbent and non-absorbent direct fix wall claddings or wall claddings installed over an 18 mm minimum drained cavity; or,
• with masonry veneer in accordance with NZBC Acceptable Solution E2/AS1 for timber-framed buildings or NASH Building Envelope Solutions for steel-framed buildings; and,
• situated in NZS 3604 Wind Zones up to, and including, Extra High.

Proprietary Rigid Wall Underlays

2. SOLITEX EXTASANA ADHERO® Self-Adhesive Underlay has also been appraised for use as a flexible underlay when used over proprietary rigid wall underlays. See Paragraphs 2.3 and 2.4 for substrates covered by this Appraisal. Also refer to the relevant BRANZ Appraisal for scope limitations and to the system proprietor to confirm the suitability of SOLITEX EXTASANA ADHERO® with their system.

3. SOLITEX EXTASANA ADHERO® Self-Adhesive Underlay may be used over the following proprietary rigid wall underlay systems:

• 4.5 mm thick HomeRAB™ Pre-Cladding and 6 and 9 mm thick RAB™ Board - refer to BRANZ Appraisal No. 611.
• Ecoply Barrier® - refer to BRANZ Appraisal No. 827.
• 10 and 13 mm thick GIB Weatherline® - refer to BRANZ Appraisal No. 1048.

Plywood Roof Sarking

4. SOLITEX EXTASANA ADHERO® Self-Adhesive Underlay has also been appraised for use as a roof underlay over plywood roof sarking on timber and steel-framed buildings within the following scope:

• with minimum 17 mm thick CD grade H3.1 LOSP treated or H3.2 CCA treated plywood complying with AS/NZS 2269 installed at the same pitch as the roof cladding; and,
• the scope limitations of NZBC Acceptable Solution E2/AS1, Paragraph 1.1 with regards to building height and floor plan area; and,
• the scope limitations of NASH Building Envelope Solutions, Paragraph 1.1 for steel-framed buildings; and,
• with roof claddings in accordance with NZBC Acceptable Solution E2/AS1 or NASH Building Envelope Solutions, Paragraphs 8.1–8.4; and,
• situated in NZS 3604 Wind Zones up to, and including, Extra High.

Use over Roofs and Walls of CLT Construction

5. SOLITEX EXTASANA ADHERO® Self-Adhesive Underlay has also been appraised for use as a wall and roof underlay when used on buildings within the following scope:

• used on buildings constructed of CLT from H1.2 Boron or H3.2 CCA treated radiata pine; and,
• with absorbent and non-absorbent wall claddings installed over an 18 mm minimum drained cavity; or,
• with masonry veneer to a specific design; and,
• with roof claddings in accordance with NZBC Acceptable Solution E2/AS1 or NASH Building Envelope Solutions, Paragraphs 8.1-8.4; and,
• situated in NZS 3604 Wind Zones up to, and including, Extra High.

(Note: CLT construction systems have not been assessed and are outside the scope of this Appraisal. Refer to Paragraph 7.13.)

Specific Design

6. Designers are responsible for confirming the suitability of SOLITEX EXTASANA ADHERO® Self-Adhesive Underlay for their specific design when used on other construction types or buildings outside the scope of this Appraisal. (Note: These have not been assessed and are outside the scope of this Appraisal).