Dam Waterproofing in South Africa lines and repairs farm dams, earth dams and storage ponds to stop seepage. Send one request and independent dam lining contractors reply with availability and prices.
Give the dam size, use and the problem, and get quotes.
Get Waterproofing QuotesWhat It Covers
- New dam linings. HDPE or LLDPE geomembranes welded on site.
- Relining. Replacing old, UV-damaged or torn liners.
- Seepage repairs. Patching tears and failed seams.
- Anchor trenches. Securing the liner edge around the crest.
- Inlets and outlets. Sealing pipes and spillways through the liner.
Common Problems
- Seepage. Water loss through porous or cracked soil.
- Wet patches below the wall. Water seeping through or under the embankment.
- Liner damage. Tears from animals, roots, UV or wind uplift.
- Seam failure. Poor welds opening over time.
Where It Applies
Farm irrigation dams, stock watering dams, game farm dams, storm water ponds, evaporation ponds and agricultural storage ponds.
Larger dams, dam walls and anything with safety risk may need an engineer and, depending on size, registration with the Department of Water and Sanitation.
Dam Waterproofing Prices
Ballpark prices so you can sanity-check a quotation.
| Item | Ballpark price |
|---|---|
| HDPE or LLDPE geomembrane supply and install | R90 - R250 per m² |
| Dam leak and seam repair | R5,000 - R30,000 |
| Geotextile underlay | R20 - R60 per m² |
| Site preparation and earthworks | R8,000 - R40,000 per site |
Prices JUST UPDATED. Indicative ballpark figures in rand, rounded, including labour unless stated. They are not our prices or quotations, and no contractor is bound by them. Confirm VAT, access costs, the product system and what each quotation includes.
Get prices for your property rather than a range. Send one request and see who replies.
Get Waterproofing QuotesWhat Affects the Quote
- Area. Large dams cost less per m² but more in total.
- Liner type and thickness. Thicker HDPE costs more and lasts longer under UV.
- Site preparation. Rocks, roots and shaping the basin add cost.
- Distance. Travel, accommodation and transport of rolls to rural sites.
How the Work Normally Runs
- Site visit. The contractor measures the dam, checks soil and access and discusses use.
- Design. Liner type, thickness, anchor trench and inlets are confirmed.
- Preparation. The basin is drained, shaped, cleared of rocks and roots, and compacted.
- Installation. Panels are laid, welded and the seams tested.
- Anchoring and filling. The edge is buried in the anchor trench and the dam refilled.
Maintenance and Questions to Ask
- Inspect after storms. Check for wind uplift, tears and erosion at the crest.
- Keep animals off. Fence where cattle or game could damage the liner.
- Ask. How are seams tested, and will I get test records?
- Ask. What thickness do you recommend for this dam, and why?
- Ask. Do I need an engineer or registration for this size of dam?
Dam Waterproofing FAQs
How long does an HDPE dam liner last?
It depends on thickness, UV exposure and installation quality. Ask each contractor for the expected life and the guarantee in writing.
Can a dam be lined while it holds water?
Generally no. The basin needs to be drained and prepared.
Do I need an engineer?
For larger dams, high walls or dams with a safety risk, yes. Small farm ponds usually do not.
Can a torn liner be repaired?
Usually, with a welded patch from matching material, if the rest of the liner is sound.
Related Services
Request dam lining quotes through Waterproofing South Africa and compare liner thickness and seam testing in each.
Waterproofing South Africa is a quote and referral service. We do not carry out waterproofing work and we do not employ contractors. Work is quoted and carried out by independent local contractors, and your agreement is with the one you choose. The right system depends on an inspection and the cause of the water ingress. Ask for a written quotation, the product system and the guarantee terms before you pay a deposit.
Dam Waterproofing. Describe what you need once and get the best quote, fast.
Get Waterproofing QuotesGet the Best Quote, Fast
Keep it brief. Say what is leaking or damp, the type of surface and your suburb. Your enquiry is passed only to contractors suited to the job, and you decide whether to go ahead.
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