DIY| Roofing with Impermax

The Impermax B1K and Impermax LY are liquid 1-component roof coverings that can be used for many applications such as waterproofing roof ducts or complete roofs. In this article you can read more about the differences between the two types and how to process the Impermax yourself!

Advantages of the Impermax roofing

  • Easy to apply with a roller and brush
  • Increases the efficiency of solar panels at lower temperatures.
  • Fully adheres to the substrate, it does not need to be nailed, burned or glued.
  • Leaks of damage are easy to repair.
  • Easy to apply on sloping edges, roof openings and skylights.
  • Minimal fire risk because you are not working with an open fire.
  • Quickly waterproof, almost immediately rainproof.

Black liquid roofing (Impermax B1K)

The Impermax B1K is a high quality roofing material. It consists of a 1-component polyurethane-bitumen with solvents and creates a seamless and waterproof membrane. The B1K can be used for various applications and is easy to apply over existing roofs, directly on bitumen, PVC, EPDM and wood without primer.

The Impermax B1K can also be used to repair old roofs by overlaying them, this can completely or only close the details such as cracks. You can easily apply 1 layer with the consumption of 1 kg/m², giving your old roof an upgrade. A 2-layer system with Impermax fleece is equivalent to a full-fledged roof covering with a consumption of 2.5 kg/m².

White liquid roofing (Impermax LY)

The Impermax LY is a white colored roof covering. This forms an aromatic and waterproof polyurethane membrane on roofs, balconies and terraces. The white color means it retains less heat and reflects sunlight. Solar panels therefore perform even better at low temperatures. The efficiency increases up to 10%, which makes the Impermax LY an ideal roof covering for solar panels.

The LY in the name stands for Light Yellowing, because it is an aromatic system it will discolor slightly over time.

Instructions Impermax

Both types of Impermax can be applied in the same way and are easy to use. For optimal adhesion, it is recommended to work on a level surface, free of dust, loose particles, oil, etc. Cracks must first be repaired with Impermax fleece. Process your Impermax at a minimum temperature of 5°C.


Please note: always wear covering clothing when working with the Impermax.

1-layer system
Comsumption: 1 kg/m²

  • Open the can and mix the contents with a spiral mixer until a homogeneous mass is obtained.
  • After mixing, let the contents rest for a while to allow the air bubbles to rise.
  • Apply the roofing material with a roller and brush
  • Then let it cure for at least 4-8 hours

2-layer system
Consumption: 2,5 kg/m²

  • Open the can and mix the contents with a spiral mixer until a homogeneous mass is obtained.
  • After mixing, let the contents rest for a while to allow the air bubbles to rise.
  • Apply a layer of 1 kg/m² with a roller.
  • Place the glass fleece in the wet layer of Impermax and roll it into the material with a further 0.5 kg/m².
  • Leave an overlap of about 10 cm for the next lane.
  • Let the layer dry for 24 hours.
  • Then apply the 2nd covering layer of 1 kg/m².

Under normal conditions, the membrane reaches 90% of its full properties in three days. It is walkable after 1-2 days. Optimal hardness is reached after 10-15 days.

Costs compared to a roofer

Compare in the table the prices you pay on average for a roofer and when you apply the Impermax yourself!

 Roofer per m² From €50,- to €150,- per m²
Impermax 1-layer per m² From €7,99 to €15,99 per m²
Impermax 2-layers per m² From €10,99 to €18,99 per m²

Questions about Impermax?

After reading this article, do you still have questions or are you interested in a non-binding step-by-step plan + customized quote for your project? Please contact our specialists, we will be happy to help you! 

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