Our strict, methodical installation process for installing on flat concrete, ensures the Multi-Dex system is as effective as possible for your home. For more information on this, feel free to contact us.

Step 1: Preparation

  • Rip and remove any old waterproofing, where necessary
  • Clean and prepare your roof for Multi-dex waterproofing.

Step 2: Priming

  • Apply a coat of Bitu-Primer (acrylic based bituminous primer) to the slab for adhesion.

Step 3: Torch on

  • Using a fusion/gas weld application method, we torch on the Multi-Dex approved 4mm waterproofing torch-on system (Derbigum), with 75mm overlaps and 100mm cross-laps as per specification.
  • Waterproofing system is then cut, dressed and sealed into outlets.

Step 4: Overcoat

  • Lastly, we apply a specially formulated acrylic aluminium coat to the entire system. Maximising UV stabilisation and ensuring longevity.

Multi-dex Approved 4mm Membrane Features:

  • High-performance synthetic fibre dual-reinforced (polyester and glass).
  • Polymer modified-bitumens coated.
  • UV degradation and heat shock resistant, for extreme durability.
  • Only fire rated torch-on system in the industry.