Product Description

SOLITEX EXTASANA ADHERO® is a synthetic self adhesive wall & roof underlay designed for New Zealand conditions, produced in Germany, and exceeds all of the testing standards of table 23 E2/AS1. The product consists of a non-porous water resistant film laminated between two layers of spun-bonded polypropylene and is coloured blue on the top surface and grey on the bottom surface with a solid acrylic adhesive layer and separation paper.  SOLITEX EXTASANA ADHERO® can be applied to Rigid wall underlay products such as Plywood, OSB, Fibre cement and Glass faced modified Gypsum board, as well as over CLT and SIP constructions.

Roll sizes 1.5m x 30m (45sqm)

Complimentary Components:

  • TESCON EXTORA is used to seal the repairs and terminations
  • TESCON EXTOSEAL Sill Tape — one piece flexible Sill Tape for window and door openings
  • Tescon ADHISO WS - Adhesive backed pure aluminium foil tape, used to improve adhesion of sealants onto Extoseal sill tape when using wet seals
  • KAFLEX / ROFLEX Weathertight sealing grommets for cables and pipes that penetrate the membrane


  • High performance monolithic nonporous membrane
  • Fire Retardant
  • Suitable for 'Early close in' (ECI) allowing internal work to commence before the cladding is installed
  • High water resistance — water column more than 10,000 mm 
  • Low vapour resistance — MVTR approx 2 MNs/g with active humidity transport
  • High durability under all conditions — unaffected by wood preservatives
  • Thermostable — above 100°C
  • UV stabilised — can be exposed to the New Zealand elements for 180 days
  • Air Barrier — can be used as an Air Barrier as per NZS2295:2006 and NZBC E2/AS1 Table 23
  • Surface weight 240 g/m²

Product Catalogue

New Zealand Study on Airtightness and Moisture Management

Price List