Description

Casali Dermabit/Dermafil torch-on membrane system is a waterproofing system for new and existing roofs, podiums, decks and parapets.

Roofs with the Casali Dermabit/Dermafil torch-on membrane system may be used to harvest potable water.

The Casali Dermabit/Dermafil Torch-on Roof and Deck system is a two-layer torch-applied, polyester-reinforced amorphous-poly-alpha-olefin (APAO) modified / Atactic Polypropylene (APP) bitumen roof waterproofing membrane with a slate chip finished upper surface and a thermofusible thermoplastic film on the lower surface.

The two layers consist of a 3mm thick Basesheet which is torch-applied or self-adhered to a primed substrate, and a 4mm coloured ceramic-chip Cap-sheet.

Basesheet

• Casali Dermabit Extra 30160 - It is supplied in 1 m x 10 m rolls.
• Casali Olympia - It is supplied in 1 m x 10 m rolls.
• Aderix SS Polyester 2.5mm PE – It is supplied in rolls 1m width x 15m length.

Capsheet

• Casali Dermabit Extra 43170 Ardesiato (Slated) - It is supplied in 1 m x 8 m rolls.
• Casali Dermafil (Slated) - It is supplied in 1 m x 10 m rolls.
• Aderix AS SP Polyester 4.5kg Mineral –it is supplied in 1 m x 10 m rolls.

Scope

1.The Casali Dermabit/Dermafil Torch-on Roof and Deck system is certified for use on buildings:

• a) where the sub-structure is:
  • i. timber framed designed in accordance with NZS3604 (as a light roof where used as roof membrane); or
  • ii. steel framed designed in accordance with NASH 2 (as a light roof where used as roof membrane); or
  • iii. concrete or other specifically designed sub-structure designed in accordance with verification method B1/VM1 using the structural design actions in AS/NZS1170; and
• b) situated:
  • i. in Wind Zones, up to, and including, Extra High (as defined in NZS 3604), and within the scope limitations of NZBC Acceptable Solution E2/AS1 para 1.1 with regards to building height; or
  • ii. in wind pressures up to a maximum design differential ultimate limit state (ULS) of 6 kPa; and
  • iii. in any expose zone (as defined in NZS3604) except microclimates, and
• c) where the substrate for the membrane is:
  • i. plywood (CCA H3.2 treated) or
  • ii. Concrete (cast in-situ or pre-cast) or
  • iii. Fibre cement compressed sheet, and
• d) where the roof or deck is pitched or nominally flat (1:80 minimum, finished) and gutters have a minimum fall of 1:100.

2.The Casali Dermabit/Dermafil Torch-on Roof and Deck system shall:

• a) be designed and installed in accordance with the Allco Torch-on Details and Installation Guide Sept 2024 and the details set out in the Allco Waterproofing Solutions Ltd Casali Dermabit/Dermafil Roof and Deck Membrane Systems Technical Details, V1.0 December 2022, and
• b) be installed by Allco Waterproofing Solutions Ltd (contact certificate holder for list of approved applicators), and
• c) be separated or protected from heat sources such as fireplaces, heating appliances and chimneys, and
• d) be protected from physical damage by a pedestal protection system or other means where the where the membrane is on a trafficable area of a roof or deck and subject to pedestrian traffic other than for installation and general maintenance.

3.This certification does not include:

• a) the design and construction of the substrate and movement / control joints, or
• b) the weather tightness design of junctions between building elements on specifically designed buildings.
• c) applications where ancillary components other than those provided by Allco Waterproofing Solutions Ltd listed in this certificate are substituted with alternative products, or
• d) integral roof gardens, steps within the deck level and direct downpipe discharge to the roof level.