Proofex Engage is intended for below-ground concrete structures on new build projects, including basement walls and foundations, lift pits and carparks, typically in commercial and multi-storey construction where tanking to BS 8102 grades 1 to 3 is required.

It also suits sites requiring methane, carbon dioxide or radon protection, or where ground conditions contain aggressive salts, chemicals or hydrocarbons.

Proofex Engage has been appraised by BRANZ as DPMs for use:

• on buildings subject to non-specific design under floor slabs complying with NZS 3604 and behind concrete masonry basement walls and under floor slabs complying with NZS 4229; and,
• in buildings subject to specific design with substrates of in-situ or precast concrete complying with NZS 3101 or concrete masonry complying with NZS 4230 and NZS 4210; and,
• where subsoil drainage and free draining granular backfill has been placed behind basement walls.

Proofex Engage has been appraised as a tanking membrane for use:

• on buildings subject to specific design with substrates of in-situ or precast concrete complying with NZS 3101; and,
• where the membrane is subject to hydrostatic pressure with the pressure not to exceed 2 bar (20m head of water). 

• Must be adequately protected against damage during backfilling and in service.
• Must be installed by a Fosroc preferred/registered applicator under a quality assurance regime

In the opinion of BRANZ, Proofex Engage if designed, used, installed and maintained in accordance with the statements and conditions of Appraisal 1035, will meet the following provisions of the NZBC:

• Clause B2 DURABILITY: Performance B2.3.1 (a) not less than 50 years. Proofex Engage meets this requirement.
• Clause E2 EXTERNAL MOISTURE: Performance E2.3.3. Proofex Engage meets this requirement.
• Clause F2 HAZARDOUS BUILDING MATERIALS: Performance F2.3.1. Proofex Engage meets this requirement.

Contributions to Compliance: 

• B2.3.1(a): Proofex Engage has a serviceable life of not less than 50 years when installed and maintained in accordance with the Appraisal and continually protected from sunlight and UV radiation.
• E2.3.3: Proofex Engage prevents the penetration of water that could cause undue dampness or damage to building elements, with a vapour flow resistance of not less than 90 MN s/g and a tanking capability up to a maximum hydrostatic pressure of 2 bar (20m head of water).
• F2.3.1: Proofex Engage is not classified as hazardous under the criteria of EPA New Zealand GHS 7 and does not present a health hazard in normal use.

Proofex Engage has been in use since 1999. It has been specified in a range of civil, commercial, and residential projects.

• Kererū Gorge culvert rebuild — Hastings District Council
• BlueScope Steel’s Port Kembla facility upgrade — NSW

• Watertightness: Pass to EN 1928 Method A with no evidence of water penetration at 6 m head; also passed ASTM D5385 at 69m. Tested to ASTM D5385 showing no lateral water migration at 100m hydrostatic water pressure.
• Mechanical performance: Impact resistance 1500mm (EN 12691 Method A); puncture resistance 672 N (ASTM E154-08); resistance to static load 20kg; nail shank tear resistance 720 N longitudinal (EN 12310-1); lapped joint shear strength ≥400 N (EN 12317-2); crack bridging up to 5mm over 100 cycles (ASTM C1305 modified).
• Tensile properties: Composite sheet plus mesh: longitudinal >9 N/mm² with elongation at break >140%; transverse >7 N/mm² with elongation at break >120% (EN 12311-2).
• Gas and chemical resistance: Methane permeability 127 ml·m⁻²·day⁻¹·atm⁻¹ unjointed (BS ISO 15105-1:2007); CO₂ permeability <5.12 E⁻¹³ m²/sec/Pa (Rilem Report 12); resistance to alkali pass at 2 kPa and 60 kPa (EN 1847/EN 1928).
• Certification: BRANZ Appraisal No. 1035; BBA Certificate No. 03/4042; CE classified as Type A and Type T to EN 13967:2012. Reaction to fire pass to EN ISO 11925-2.
  Environmental: Approved as an "environmentally preferred coating" under the Green Label Singapore labelling scheme.
• Lifespan: Design life of 100-plus years and a warranty of up to 20 years.