Belzona 3121 (MR7)

A 2-part, liquid-applied emergency roof repair material providing instant waterproofing of leaking roof areas.
Where to Buy

Belzona 3121 (MR7)

A 2-part, liquid-applied emergency roof repair material providing instant waterproofing of leaking roof areas.
Where to Buy
Description

A 2-part, liquid-applied emergency roof repair material providing instant waterproofing of leaking roof areas. Belzona 3121 (MR7) is a flexible membrane and bonds strongly to all common roofing surfaces including slate roofs, tile roofs, asphalt, felt, asbestos cement sheet roofs and metal roofs, even during adverse weather conditions.

This fast-curing, all climate roof repair coating incorporates a reinforcement sheet which ensures the coating will adapt to roof movements and follows complex roofing contours. This roof waterproofing membrane is water resistant immediately after application and can cure even if fully immersed in water.

  • Provides long-term roof protection
  • Microporous structure allows trapped moisture to escape whilst providing long-term weatherproofing protection
  • Reduced health and safety risks as it is solvent-free
  • Lightweight material, will not overload existing structures
  • Excellent adhesion to a wide range of materials including felt, asphalt, lead, zinc, copper, glass, concrete and brick
  • Adapts to roof movements due to its outstanding elasticity
  • Can be easily applied by brush and roller with no mixing required
  • Application and cure at room temperature no hot work involved
  • Energy Star approved as it incorporates special reflective fillers, which reflect sunlight and minimize air conditioning costs
  • Creation of waterproof and weatherproof roof surfaces
  • Long-term roof leak repair and protection of deteriorated gutters
  • Sealing of glazing bars
  • Weatherproofing around upstands and other roof protrusions such as skylights, chimneys and vents
  • Replacement of damaged or missing flashings
  • Sealing of gaps and joints on coping stones as well as roof parapet walls
  • Sealing of tank bases

* All products are subject to regional restrictions. Check with your local Distributor for more information

15 L 18 L and 120 L

Note: Sizing and availability may change per region. Please contact Belzona for details.

Product Applications

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Can Be Used Together

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QUESTIONS & ANSWERS

A flexible membrane is a microporous coating that acts as a barrier to prevent the permeation of one substance but allows others.
The application of the roof waterproofing coating, Belzona 3121 (MR7), depends on the substrate. Generally, the area must be sturdy, clean, dry, and free of any loose material. Also, abrade the surface of non-porous substrates. Then, add the contents of the Solidifier container to the Base container and mix thoroughly to achieve a uniform consistency.
Next, apply the first layer of Belzona 3121 (MR7) to the prepared surface. Immediately apply Belzona 9331 (MR7 Reinforcement Sheet) with the fibrous side face down and ensure the sheet is completely wetted.

Apply the second layer of Belzona 3121 (MR7) as soon as possible. Finally, allow curing.
The roof coating, Belzona 3121 (MR7), is water-resistant immediately after application, but the times to develop ultimate adhesive and mechanical properties are as follows:
Ambient temperature 68°F (20°C) 50°F (10°C) 32°F (0°C)
Time to develop properties 7 days 15 days 30 days
Please see the Instructions for Use (IFU) for more information: Belzona 3121