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 must be sealed with Thermakraft White General Purpose Tape, Thermakraft Premium Joining Tape or Aluband Window Flashing Tape at the lap joints to form a complete vapour barrier
• Maximum weather or UV exposure is 30 days
• Cannot be used as a roof or wall underlay

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.

Thermathene Orange Concrete Underlay is a suitable DPM material (polyethylene sheet), and is expected to have a serviceable life of at least 50 years provided it is installed and maintained in accordance with this Appraisal and is continually protected from sunlight and ultra-violet (UV) radiation.

Thermathene Orange Concrete Underlay may be exposed for a maximum period of 30 days before the concrete slab is placed.