Where Can Cosmofin Membranes Be Installed?

Cosmofin has been successfully installed in the following areas:

  • Roof Decks (exposed, ballasted)
  • Green Roofs & Landscaped Areas (FLL Certified)
  • Balconies (tiled, pavers on support, timber decking)
  • Terraces
  • Basements
  • Planter boxes
  • Green walls
  • Retaining walls
  • Gutters – or as a pre-made gutter
  • Carpark and Driveway
  • Under-slab
  • Lift Pits
  • Expansion joints
  • Tunnel walls and bunkers
  • Podium slabs
  • Fountains and water features*
  • Dams*
  • Water envelopes*
  • Water detention tanks*

* Not suitable for potable water situation

The Cosmofin membranes can be applied on the following substrates:

  • Concrete
  • Timber
  • Steel
  • Masonry
  • Blockwork
  • CFC
  • Old Bitumen Roofs
  • Insulation Products
  • Failed Waterproofing Membranes

The loose laid membrane can also be installed over a damp substrate.

The Different Cosmofin Applications

Cosmofin Loose-Laid Application

Both Cosmofin Membranes (LL or LLV) can be used for loose-laid applications. This type of application does not require any adhesive and is typically used in areas such as:

  • Lift-Pits
  • Retaining Walls
  • Planter Boxes
  • Tanks

Cosmofin Strip-Bonded Application

The strip-bonded application is suitable for the LLV Cosmofin Membrane & has been recently developed to increase speed of installation when the bonding membrane requires adhesion. The TK 400 is applied in approximately 30mm strip/beads to the substrate. This type of application can be used in areas such as:

  • Rooftops (green roof or exposed)
  • Balconies and Terraces
  • Podium Slabs
1- LLV Installation2- TK 400 Installation

Cosmofin Fully-Bonded Application

The bonded application uses traditional glues and adhesives for bonding of the membrane and substrate. Again, both Cosmofin Membranes (LL or LLV) can be installed using that method. This conventional type of application is used in areas such as:

  • Rooftops (green roof or exposed)
  • Balconies and Terraces
  • Podium Slabs

If you require any assistance, please refer to Projex Group

Technical Assistance

How to Install Cosmofin?

Step 1: Substrate Preparation

  • All substrates to which the Cosmofin membrane is to be applied must be sound, smooth, clean, dry and free from the residues of any foreign material.
  • Oil or bitumen residues must be removed (Except LLV).
  • Check the existing bond and/ or compatibility before deciding to leave existing membranes in position.
  • While laying the membrane, keep the substrate swept clean and prevent stones or debris from lodging under the membrane.

Step 2: Membrane Laying

  • Set out the rolls so that they are used most economically, and the welds are minimised.

Step 3: Lap Welding

  • Side laps: Overlap each roll a minimum of 50 mm and weld the full width.
  • End laps: All as side laps.
  • Multi lap junctions (capillaries): Where these occur they are to be welded tight. Sealants should not be used.

Step 4: Profile Fixing

  • COSMOFINSTEEL profiles are supplied in 2 metres lengths. Space them 2 mm apart and join with 50mm wide welded patches for the full girth of the profile. This jointing process is not required for Type D2. Fix all profiles at 200 mm centres.

Step 5: Edge Cutting

  • All sheet or patch edges where the selvedge is cut away, should be dressed with Cosmofin Liquid so that they are “closed” against ponding water.

Technical Assistance

Projex Group P/L offer a full & comprehensive back up service for all Cosmofin installations