What are the three types of materials defined in this standard?

Type 1 (General Purpose Repair Mortar), Type 2 (High Strength Repair Mortar), and Type 3 (Waterproofing Coating) as per Clause 5.

What is the minimum bond strength required for repair mortars (Type 1 & 2)?

A minimum pull-off bond strength of 1.5 MPa is required after 28 days of curing (Table 1).

What is the maximum water penetration allowed?

The maximum depth of water penetration must be 10 mm when tested according to the method in Annex A (Table 1).

Does this code apply to epoxy or polyurethane-based repair materials?

No, this standard is specifically for cement-based polymer-modified materials.

IS 16474

: 2017

Cement based polymer modified repair mortar/coating for waterproofing - Specification

CurrentSpecializedSpecificationBIMMaterials Science · Waterproofing and Damp Proofing

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This standard specifies requirements for pre-packed, cement-based, polymer-modified mortars and coatings used for waterproofing and repairing concrete. It classifies products into three types based on application (general repair, high-strength repair, coating) and outlines performance criteria like strength, adhesion, and water permeability.

Specifies requirements for cement-based polymer modified repair mortars/coatings primarily for waterproofing and repair applications.

Quick Reference Values

Min Compressive Strength (28d) for Type 125 MPa

Min Compressive Strength (28d) for Type 240 MPa

Min Bond Strength (28d) for Type 1 & 21.5 MPa

Max Water Permeability (Depth)10 mm

Min Pot Life at 27°C30 min

Min Water Vapour Permeability300 g/m²/24h

Practical Notes

The standard covers only pre-packed, factory-made products, not site-mixed polymer, cement, and sand.

Proper surface preparation, including pre-wetting to a saturated surface-dry (SSD) condition, is critical to achieve the specified bond strength.

Select the correct material type for the intended application: Type 1 for general repair, Type 2 for high-strength structural repair, and Type 3 for thin-section waterproofing coatings.