Mapei Lamposilex (Waterplug)

£21.39

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Mapei Lamposilex is a rapid-setting hydraulic waterplug mortar used to instantly stop active water leaks in concrete and masonry. It expands as it cures to form a permanent seal, even under pressure. Ideal for pre-sealing before applying waterproofing systems in basements, tanks, and foundations.

Size

5Kg

Product variants

Delivery and Shipping

Place your order before 3pm for next working day delivery.

Please note: Additional delivery charges may apply for Northern Ireland, Isle of Wight, Isle of Man, Isles of Scilly, Scottish Highlands & Islands, and Channel Islands. We will contact you to inform you of any additional costs once your order is received, or you can call us on 0800 111 4898 beforehand to confirm.

Description

Rapid-Setting Hydraulic Plug for Sealing Active Water Leaks

Mapei Lamposilex is a rapid-setting, cement-based hydraulic mortar designed to instantly stop water ingress through cracks, joints, or holes in masonry and concrete structures. Commonly referred to as a "waterplug," Lamposilex expands as it sets, creating a mechanical seal even under pressure. It is ideal for use in waterproofing applications where active leaks need immediate control — including basements, tunnels, tanks, and foundations.

Key Features & Benefits

Instant Leak Sealing: Stops active water flow within seconds of application.
Expanding Seal: Expands during curing to tightly seal against water pressure.
Fast Setting Time: Sets in 2 minutes or less, depending on ambient temperature.
High Strength: Once cured, forms a durable and permanent seal resistant to pressure and moisture.
Compatible with Waterproofing Systems: Can be overcoated with tanking slurries or membranes such as Biokil Crown Toptank or Newton 508.

Product Details

Brand: Mapei
Type: Hydraulic cement-based plugging mortar
Form: Pre-blended powder (just add water)
Colour: Grey
Setting Time: Approx. 2 minutes
Application Method: Hand-applied by gloved fingers or trowel
Coverage: Variable depending on void size (refer to technical datasheet)
SKU: LAMPO5

Application Instructions

Surface Preparation: Cut out and clean the leaking area to remove any loose or weak material.
Mixing: Add clean water to the powder to form a stiff, workable paste (only mix what can be used in 1 minute).
Application: Press the paste firmly into the leak using a gloved hand. Hold in place until fully set.
Finishing: Once the leak is sealed, surface can be finished or overcoated with waterproofing systems as required.

Limitations

Only suitable for localised repairs and sealing. Not a substitute for full waterproofing systems.
Do not apply below 5°C or onto frozen or contaminated surfaces.

Health & Safety

Contains cement: avoid inhalation of dust and contact with skin or eyes. Use gloves and goggles during mixing and application. Refer to the Safety Data Sheet (SDS) for full guidance.