What is the recommended hardness number for roofing bitumen mastic?

30 to 60 when tested at 25°C, ensuring the material is flexible yet stable under typical roof temperatures.

Does this standard cover how to apply the bitumen mastic on the roof?

No, IS 3037 is a material specification. The code of practice for application is IS 4365.

What is the maximum allowable heating temperature during preparation?

The mastic should not be heated beyond 200°C to avoid damaging the bituminous binder.

IS 3037

: 1986

bitumen mastic for use in water-proofing of roofs

CurrentSpecializedSpecificationMaterials Science · Waterproofing and Damp-Proofing

Download PDF BIS Portal Google

This standard specifies the material requirements, manufacturing process, and physical properties (such as hardness number and bitumen content) of bitumen mastic used for waterproofing of building roofs.

bitumen mastic for use in water-proofing of roofs

Quick Reference Values

Hardness Number at 25°C30 to 60

Bitumen Content (Minimum)14% to 17% by mass depending on formulation

Maximum Heating Temperature200°C

Practical Notes

Mastic must be heated slowly and continuously agitated to prevent local overheating and degradation of the bitumen.

IS 3037 specifies the material manufacturing; for site application procedures, engineers must refer to IS 4365.

Proper grading of the fine aggregate and filler is essential to achieve the specified hardness number and prevent the mastic from flowing under solar heat.