Waterproofing and damp
Waterproofing water tanks and underground sumps
Signs your tank is leaking
- Damp patches or salt marks on the walls or ceiling below an overhead tank
- Water level dropping when no one is using water
- Wet soil or seepage near an underground sump
- Cracks or exposed aggregate inside the tank
Building a new tank or sump
The best time to waterproof is while the concrete is being cast. A crystalline admixture like Berger HomeShield Shalicrystal 100 reacts inside the concrete and helps block water paths, with a self-healing effect on fine cracks. Good compaction, curing and sealing pipe entry points matter as much as the admixture. Builders and contractors can order site quantities through our contractor supply.
Repairing an existing tank
- Empty the tank and clean off algae, sludge and loose material.
- Cut out and patch damaged concrete; Berger HomeShield Repairo suits patch repairs and edges.
- Seal pipe entries and corners.
- Apply the waterproof coating in the specified number of coats, brushing it well into the surface.
- Cure as instructed and let it set fully before refilling.
A note on drinking water tanks
For tanks that store drinking water, check the product data sheet and suitability before use, and follow curing and washing instructions before the tank is put back in service. If you are unsure, call us and we will check the details for the product you plan to use.
Before any waterproofing job
- Find where the water enters before choosing a product
- Let the surface dry fully; most coatings fail on wet substrates
- Clean off moss, dust, loose plaster and old peeling coats
- Open and fill cracks; seal joints, pipe entries and parapet corners
- Follow the coat count and curing time on the data sheet
- Paint only after the waterproofing has cured
Signs that the problem needs an expert look
- The damp patch keeps growing after you have repaired the obvious cause
- Plaster sounds hollow when tapped, or pieces fall off
- Cracks are wider than a few millimetres or run diagonally from window and door corners
- Water appears in a room with no bathroom, tank or pipe nearby
- Steel bars are visible or rust stains run down the concrete
These can point to structural movement or hidden leaks. Get the source checked before spending on coatings.
The right season for waterproofing in this region
Across Gwalior, Morena, Bhind and the other districts, the useful window is the dry period from March to June, before the July rains. Roofs and walls are dry, coatings cure properly and you can test the work before the monsoon. Small repairs can be done in October and November after the rains, when walls have dried out. Avoid starting major waterproofing in July and August: wet surfaces are the most common reason coatings fail early.
Berger products that suit this job
| Product | Range | What it is |
|---|---|---|
| Berger HomeShield Wall Shield 2K | Premium | HomeShield Wall Shield 2K is a white cement-based waterproof slurry modified with acrylic polymer. |
| Berger HomeShield Latex Shield 2K | Premium | HomeShield Latex Shield 2K is a two-component polymer waterproofing for concrete, brick and block work. |
| Berger HomeShield Shalicrystal 100 | Premium | HomeShield Shalicrystal 100 is an admixture added to concrete. |
| Berger HomeShield Repairo | Premium | HomeShield Repairo is a ready repair mortar for patching and cement work. |
Buying Berger outside Gwalior city
PT Enterprises supplies more than 70 Berger dealers across the Gwalior region, so the products in this guide are available in Gwalior, Morena, Bhind, Sheopur, Shivpuri, Datia, Guna, Ashoknagar. Call or WhatsApp +91 77559 81105 and we will tell you the nearest dealer and check stock.
Useful next steps
- Waterproofing solutions
- Free site visit and estimate in Gwalior
- Berger waterproofing products
- Our Berger DOCO store in Gwalior
Frequently asked questions
Can I waterproof the tank from outside?
For overhead tanks, inside treatment is usually more effective because water pressure acts from inside. Outside coating helps protect the structure.
How long before I can refill?
It depends on the product and weather. Follow the curing time on the data sheet.
Do you supply builders in Morena and Gwalior?
Yes. Call +91 77559 81105 for site quantities.
About this guide: written by the team at PT Enterprises, the authorised Berger Paints distributor for the Gwalior region, which supplies dealers in eight districts and runs a Berger DOCO store in Gwalior. Product details follow Berger’s published data sheets; check the data sheet of your exact product for coverage, coats and drying time.
