BITUBOND HM

Description

Hot poured waterproofing membrane

 

Bitubond HM is a single component, hot-poured rubber asphalt compound, which cures to form a tough & flexible waterproofing membrane.

Properties

  • Forms a tough and flexible waterproofing membrane 
  • Suitable for high ambient temperature application. Will not run or flow at temperatures up to 80º C 
  • Has good adhesion to asphalt and concrete substrates 
  • Seamless / Joint free

This TDS is applicable for the United Arab Emirates only. Please contact your local Polybit sales office for the available TDS in your region

Step by step

SURFACE PREPARATION

The surface shall be cleaned thoroughly of all contaminants like dust, traces of curing compound, oil and grease. Light mechanical grinding / grit blasting / high pressure water jet may be used to clean the surface of all the contaminants depending on the degree of contamination on the surface to be coated. All surface imperfections, protrusions, structurally unsound and friable concrete must be removed and repaired with a suitable concrete repair mortar.

PRIMING

Polyprime SB shall be primed on the prepared substrate prior to the application of Bitubond HM. Due to its low viscosity, the primer is penetrative in nature and easily penetrates into the concrete pores which promotes the adhesion between the membrane and the concrete surface.

In addition to that, the primer also acts as a binder for the dust particles which gets accumulated on the concrete surface even after cleaning. Application of primer will also assist in the application of this heavy bodied coating and will ensure a more readily achieved even coverage. The primer can be applied with a brush, roller or squeegee.

APPLICATION

Heat Bitubond HM to 175ºC in a suitable oil jacketed heat vessel. Pour the melted compound on the surface and spread or apply it with a trowel / spatula at a rate of 1m2 /ltr/coat to achieve a dry film thickness of 1mm. For more demandingsituations, it is recommended to apply the coating @ min 2mm DFT. Protect the applied membrane from damage until it has cooled down and forms a tough resilient membrane.

PRECAUTION

Care should be taken when heating Bitubond HM. The maximum safe heating temperature should not exceed 210º C. Use an oil jacketed bitumen heater with temperature control. Small quantities (up to 5 Kg) can be heated by direct heating method.

PROTECTION

Bitubond HM coating should be protected from getting damage due to the ongoing site activities and during backfilling. Coating laid on horizontal surfaces can be protected either by a cement sand screed (50mm thick) or by a fibre impregnated asphaltic protection board (Bituboard). On vertical surfaces the coating shall be protected with Bituboard. Bituboard can be fixed on the membrane by a double sided bitumen adhesive tape (Watertite TS 15).