Waterproofing Warranty in India: What a 10-Year Guarantee Actually Covers

Ten-year waterproofing warranties are widely offered in Pune and widely misunderstood. This guide sets out what such a document reasonably covers, what it reasonably excludes, and which clauses are worth reading closely before you approve an estimate.

What a warranty is, in practice

A waterproofing warranty is a written undertaking that if water penetrates the treated area during the stated term, because the applied system failed, the contractor will make it good at no cost. Three qualifiers in that sentence do the work: the treated area, during the stated term, and because the applied system failed. Most disputes turn on one of the three.

The two kinds of warranty, and why the distinction matters

The distinction matters because the overwhelming majority of waterproofing failures are not material failures. They are inadequate preparation, insufficient thickness, missed junction detailing, or compressed curing. A manufacturer warranty pays out on none of those. When a contractor says “it comes with a ten-year warranty”, the useful follow-up is: whose warranty, and does it cover the labour to put it right?

Exclusions that are reasonable

A well-drafted warranty will exclude the following, and these exclusions are fair:

• Structural movement beyond the system’s rated capability — a coating rated to bridge 2 mm cannot be blamed for a 10 mm settlement crack.
• Third-party breach — a subsequent contractor drilling through the membrane to fix a railing, an antenna or a solar mount.
• Change of use — adding a water tank, a planter box or heavy traffic to a surface specified for none of those.
• Lack of maintenance — blocked rainwater outlets causing ponding is the classic example, and it is genuinely the owner’s responsibility.
• Ingress from an untreated area — water entering the flat below from a neighbour’s untreated bathroom is not a failure of your terrace.

Clauses worth negotiating before you sign

Transferability

Warranties in India do not transfer automatically on sale. For a flat owner planning to sell, or a society with turnover among members, a transferability clause is one of the highest-value things to ask for and usually costs nothing to include.

Response time

A warranty that promises repair without stating a response time can be honoured slowly enough to be worthless during a monsoon. Ask for a stated period for inspection after a reported leak.

Partial versus full remediation

Does the warranty cover repair of the failed section, or re-treatment of the affected area? For a large terrace the difference is substantial, and it should be explicit.

What survives a partial claim

If a section is repaired in year four, does the original ten-year term continue on the rest, and what term applies to the repaired section? Well-drafted documents answer this; most do not.

The records that make a claim easy

Warranty claims years after the work are won or lost on documentation. At handover, ask for and keep:

• Photographs of the substrate after preparation and before the first coat
• Photographs of junction, upstand and penetration detailing before over-coating
• Dry film thickness readings, if a gauge was used
• The water or hold test result, dated and signed
• Product data sheets and batch details for the materials used
• The signed warranty document itself, with exclusions

A contractor who provides this set as a matter of course is a contractor whose work will stand up to the scrutiny. One who cannot produce any of it after the event is in a weak position to defend the work — and so are you.

What we do

Eligible completed projects carry a written ten-year warranty on the treated area. The work is water-tested in front of you before handover, and the exclusions are stated on the estimate before you approve it rather than disclosed at claim stage. The full credentials and compliance position is set out separately.

Frequently asked questions

What does a 10-year warranty actually cover?

Water ingress through the treated area arising from failure of the applied system, for the stated term, subject to disclosed exclusions.

Manufacturer or applicator warranty — which do I want?

The applicator warranty, because it covers workmanship, and most failures are workmanship. Ideally both.

Does the warranty transfer if I sell?

Only if the document says so. Negotiate it in writing at quotation stage.