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Impermax is a high‑performance liquid waterproofing membrane designed to form a seamless, durable coating across ponds, water features, and containment structures. To achieve full mechanical strength and long‑term waterproofing, it is essential to apply the correct quantity of product per square metre.
Coverage Per Container
Each container of Impermax is formulated for a specific surface area:
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25 kg container → covers approximately 5 m × 5 m (25 m²) per coat
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10 kg container → covers approximately 10 m² per coat
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5 kg container → covers approximately 5 m² per coat
Coverage is calculated by measuring the surface area and ensuring the correct amount of product is applied per layer.
Required Thickness & Product Consumption
Impermax does not contain large quantities of mineral fillers. This is intentional — fillers add bulk but do not contribute to mechanical strength. Because Impermax is a self‑levelling polyurethane membrane, the strength comes from achieving the correct film thickness.
Correct Consumption
To achieve the required membrane depth:
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0.8 mm thickness requires 1.0 kg per m²
This is the minimum consumption needed to ensure the membrane cures with the correct strength, elasticity, and waterproofing performance. Applying less product will result in an under‑thickness membrane that may fail prematurely.
Most installations require two full coats, each applied at the correct rate, to reach the manufacturer‑specified total thickness.
Application Notes
1. Measure Before You Apply
Before opening the container, measure the surface area you intend to coat. This ensures the correct quantity of Impermax is applied per layer and prevents under‑application.
2. Apply Generous, Even Layers
Because the product is self‑levelling, it should be applied in a continuous, even film. Avoid stretching the product too thin, as this reduces the final membrane thickness.
3. Saving Surplus Product
If you have unused Impermax after completing a coat:
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Transfer the remaining product into a smaller, airtight container to reduce air exposure.
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Seal the container tightly.
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Store it upside down — this allows the product to seal any micro‑gaps in the lid and helps prevent air ingress.
This method extends the usable life of the remaining product.
Supplier product code: LS1003.
Supplier availability: This item may be dispatched directly by our supplier. Stock availability can change. If supplier stock becomes unavailable, your order may need to be placed on backorder. We will contact you with an estimated dispatch date.
Delivery and collection arrangements depend on the items ordered. For live fish, read our koi delivery guide and confirm the booking with us before dispatch. For dry goods and other items, see shipping and returns.
Firework Spectacular: free mainland UK delivery
Free mainland UK delivery is included with all ten numbered Firework Spectacular koi bowls. No delivery code is required. Delivery is booked with you before dispatch; contact us before ordering for Highlands, islands or restricted live-fish postcodes. Collection from Grimsby is also available by appointment. View the Firework Spectacular bowls. The standard delivery charges below apply to other orders unless a separate offer applies.
Shipping
At Elite Koi we understand the importance of receiving your items quickly. We shall endeavour to dispatch your items within 1 working day and same day if your order is received before 1pm. Orders are not accepted until you receive notification from us that the order has been fulfilled via e-mail. Our courier service is not guaranteed to be overnight due to some circumstances being beyond our control.
Dry Goods Shipped by Courier, 95% - 98% of all orders couriered are received the following working day however this is not guaranteed by our courier service provider, therefore Elite Koi do not and cannot guarantee Overnight service. If your item is required urgently please contact us prior to checking out.
Working days do not include Saturday's, Sunday's or Bank Holidays. i.e. if an order is placed on a Friday before 1pm, the item will be dispatched from us and collected by the courier. The item will not be delivered until the following Monday at the earliest and in some cases this could be the Tuesday.
Elite Koi do not ship any goods on Wednesday's, however if the item is needed urgently please contact prior to placing the order.
Please see below for our delivery methods and costs.
Dry Goods
Shipping costs added at checkout. Please contact us with any queries
Live Fish
Live Fish £30 per box overnight courier service. Live fish require conditioning to travel and Elite Koi will contact you to book the service for a convenient time for you to receive the Koi prior to Noon Wednesday & Friday
If your fish arrives damaged or deceased contact us immediately on 07561 804263.
Returns of Live fish cannot be accepted.
Returns
We hope you are happy with your purchases from Elite Koi however if you have ordered the wrong item let us know for an exchange. All Dry Goods can be returned within 30 days of the date of purchase provided they have not been opened or used. Should you wish to return an item which is unopened and unused please contact us within 30 days of the sale of purchase. We will then send you our return details.
Items damaged in the post should be reported to us within 48 Hours of receipt.
If you wish to return an item please use the "Contact Us" button at the top of page or call us on 07561 804263.
Please contact us for the postal return address.
Live Fish
If your fish arrives damaged or deceased contact us immediately on 07561 804263.
Returns of Live fish cannot be accepted.
