Reservoir Linings – Custom Reservoir Waterproofing Solutions
Rainbow Tarps and Linings craft precision-fit polyester scrim-reinforced PVC liners that secure Africa’s water future while creating jobs and reducing environmental impact through virgin and recycled materials. A fully integrated reservoir lining system includes the liner, custom-made outlet sleeve fittings and an optional UV shield or reservoir cover.
Custom Liners for Every Reservoir Type
We engineer UV-stabilised reinforced PVC geomembranes to perfectly fit:
- Round, square & rectangular reservoirs
- Cement dams
- Brick dams
- Zinc dams
- Welded mesh wall dams
- Steel frame reservoirs
🛠️ Repairing a leaking dam? Our liners install directly into existing structures.
Premium PVC Liner Options
- 410 mic – upcycled liner, entry-level cost-effective standard duty, white.
- 450 mic – virgin liner, standard-duty performance. Ideal for irrigation, aquaponics, livestock dams and leaking water tanks.
600 Micron – Medium Duty, Versatile
- ✅ Perfect for aquaculture (fish farming), intensive irrigation and livestock dams.
- ✅ Enhanced puncture resistance.
- ✅ Withstands frequent use.
620 Micron – Potable Water, Medium Duty
- ✅ Potable-water certified – safe for human consumption.
- ✅ Ideal for municipal water storage and community reservoirs.
- ✅ Perfect for home drinking-water tank liners.
700 Micron – Heavy Duty, Top Performance
- ✅ Built for commercial fish farms, swimming pools and irrigation reservoirs.
- ✅ Excellent abrasion resistance and longevity.
- ✅ Animal-proof durability.
- ✅ Upcycled 700 mic option – best value for money, tough liner, white only.
800 Micron – Extra Heavy Duty, Best Performance
- ✅ Built for commercial fish farms, swimming pools, irrigation reservoirs and high-UV-exposure sites.
- ✅ Excellent abrasion resistance, longevity, super tough.
- ✅ Commercial farmers’ and mining operations’ first choice.
Rainbow Range – Custom Solutions
🌈 Choose upcycled fabrics for cost optimisation without compromising quality.
🌞 For added protection, add a UV shield for extended performance.
🌱 For debris-free water, install a leaf-catcher mesh cover.
🔧 For algae-free water, install a pitched tarp roof or floating cover. See our Reservoir Covers page.
Key Benefits of Our Liners
🌱 Eco-conscious manufacturing – recycled PVC options reduce landfill waste.
🔧 Precision engineering – custom-designed for a perfect fit, seamless installation over complex structures, 5-year warranty (expect 8+ years depending on thickness).
💧 Water security – zero-leak performance, long-term water storage.
Applications Spotlight
| Structure Type | Recommended Liner | Key Benefit |
|---|---|---|
| Cement/Brick Dams | 410–800 mic | Seals cracks & porous surfaces |
| Zinc/Welded Mesh | 410–800 mic | Flexible conformity to irregular shapes |
| Steel Frame Tanks | 600–800 mic | Durable, withstands water pressure |
| Fish Farming Tanks | 600–800 mic | Withstands equipment & stock activity |
Need help selecting? Our reservoir specialists offer free advice. Site visits at a 50% refundable fee on acceptance of quote.
UV Shield Protection System – Extend Your Liner’s Lifespan
Due to Africa’s harsh sun, we’ve engineered this affordable solution to protect your water investments while supporting local jobs and reducing environmental waste through recycled materials.
What is a UV Shield? A protective barrier system that covers exposed liner areas when reservoir covers aren’t practical:
- ✅ 320-micron PVC mesh (reinforced PVC mesh, perforated net).
- ✅ OR 450-micron liner (solid UV-resistant alternative).
- ✅ Pre-welded installation for added protection.
Why Your Dam Needs This
Protected areas:
- Outside wall fold-over (most vulnerable section).
- Top of dam wall (direct sun exposure).
- First 70cm inside the dam (fluctuation zone).
☀️ The PVC mesh option prevents up to 70% — and the 450-micron liner 100% — of UV degradation to the liner, adding 5–8 years to liner lifespan at a fraction of the cost of a new liner.
Critical for irrigation dams where:
- ✔ Water levels constantly change.
- ✔ Liner walls face daily sun exposure.
- ✔ The UV index is exceptionally high.
- ✔ No reservoir cover is fitted.
UV Shield – Cost-Saving Benefits
- 💰 1/5 the cost of a full liner replacement.
- 🔄 Future-proofing – only replace the shield, not the liner.
- ⚡ No extra installation – welded to the liner at time of manufacturing.
UV Shield – Technical Specifications
| Option | Thickness | Material | Best For |
|---|---|---|---|
| Standard Shield | 320 mic | Recycled PVC mesh | Moderate UV areas |
| Premium Shield | 450 mic | Virgin PVC | Extreme sun exposure |
Key features:
- UV stabilisers rated for 5 to 8 years.
- Withstands -20°C to 60°C temperatures.
Why Choose Rainbow’s UV Shield?
- 🌱 Eco-Smart – made from 100% upcycled PVC (320mic mesh and 450-micron PVC tarp off-cuts).
- 📆 Long-Term Value – 5-year warranty on workmanship and material failure.
Protect your investment today! Our dam experts will assess your UV exposure risks.
📩 Get a UV damage assessment and quote — 📞 call our shield specialists on (+27) 72 562 2658 or email sales@rainbowtarps.co.za.
Installation – Simple DIY or Professional
1. Simple DIY installation – all-inclusive kits with fully illustrated instructions. Everything supplied: outlet fittings, securing strap or cable, Dam Good sealing tape/glue, and the reservoir liner. Phone/WhatsApp support during installation; cost-effective with no labour fees. If you can farm, you can do this.
Professional Factory Installation
Nationwide certified teams. The fee includes site assessment on arrival, travel & accommodation, expert installation and a 5-year workmanship warranty. Best suited to large/commercial reservoirs, complex shapes, mining/industrial applications, and those less technically orientated — for total peace of mind.
How to Measure Your Reservoir (DIY Guide)
Five simple steps:
- Inside diameter – measure inside, wall-to-wall, at the widest points.
- Wall height – from base to top edge, inside the dam.
- Wall thickness – specify type: single/double brick, zinc sheeting (corrugated or flat), welded mesh, or concrete/stone.
- Outlet requirements – number of outlets and sizes (mm).
An illustrated measurement template and WhatsApp voice/video support are available.
Request a Custom Quote
📞 Call: (+27) 72 562 2658
📧 Email: sales@rainbowtarps.co.za