Pacoflex is a durable external waterproof membrane, which allows for
the selection of vegetation. Mastic asphalt is one of the oldest green roof system around It has been used in this situation since the 1930's
product is Pacoflex, which is polymer modified mastic asphalt. It comprises of
limestone aggregates bound together by asphalt cement an polymers
system must be laid on a concrete or plywood substrate. A separation layer is
required between the substrate and mastic asphalt topping, which is formed in
two 10mm layers. For a green roof system, Geo-textile and drainage cells are
applied over the mastic asphalt layer. The planting forms an external layer and can be of an intensive or extensive planting.
Scope of use
green roof system is applied on flat to moderately sloped roofs.
It is suitable in new
or existing commercial and buildings.It can be used for planter boxes podium planters or green roofs on residential or commercial buildings. Due to its durability and seamless nature mastic asphalt can be laid to minimal falls and has been on many New Zealand buildings,. Unlike sheet membranes there are no herbicides within the membrane. Mastic asphalt is laid 20mm thick and is monolithic therefore it cannot be penetrated by roots.
New Zealand Building Code (NZBC)
The product will, if employed in accordance with the supplier's installation and maintenance requirements, assist with meeting the following provisions of the building code:
- Clause B1 Structure: Performance B1.3.1, B1.3.2, B1.3.3(a), B1.3.3(c), B1.3.3(e), B1.3.3(q)
- Clause B2 Durability: Performance B2.3.1(b), B2.3.2
- Clause C6 Structural stability: Performance C6.2
- Clause E1 Surface water: Performance E1.3.1, E1.3.3(a), E1.3.3(b), E1.3.3(c), E1.3.3(d), E1.3.3(e), E1.3.3(f)
- Clause F2 Hazardous building materials: Performance F2.3.1
The product meets the requirements set out in the following documents, or relevant parts of cited standards within the documents:
Pure Asphalt waterproofing system Pacoflex Approval Inspection Testing
Certification 11/4859 14/09/2011.
BS: 8218:1998 Code of practice for mastic asphalt
roofing. UKAS Tested in relation to fire.
2003 Flat roofs with continuously
supported coverings. Code of practice
accordance to European standard: BS EN 13108-6:2006 Accepted
as New Zealand Standard Bituminous mixtures. Material specifications. Mastic asphalt
144: 1972 (Durability) Pacoflex
life serviceability up to 50 years
resistance tested to UK National Building Regulation Section C.2 UKAS
toxic once cured see Pure
Asphalt Product Safety Sheet
The product has and can make available the following additional evidence to support the above statements:
Use in Service History
- Stamford Plaza Hotel Auckland New Zealand: 2 x 10mm of
mastic asphalt applied on the green roof system on level 5 of the hotel
covering an area of 1600m².
Chambers and Station, ANZ Tower
concrete substrate must be designed in accordance with NZS 3604:2011 or AS/NZ
plywood sheets must be CCA treated to
H3.2. The plywood must be a minimum of 17mm thickness complying with AS/NZS
must be greater than 1:30 for roofs, 1:40 for decks and 1:100 for gutters.
All work to be carried out by approved Asphaltech
applicators experienced in mastic asphalt work.
substrate must be dry, with no sharp projections.
roof systems should be inspected twice a year to check for damages and
should be removed from the system.
Approved qualified contractor to perform any repair work.
to Asphaltech Waterproofing maintenance schedule.
||ISO 9002 Quality Management Systems