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Waterproofing Admixtures
Designed to protect concrete from water damage at the mix stage, Waterproofing Admixtures are specialist waterproofing additives used to reduce porosity and capillary action. These advanced compounds are incorporated directly into concrete or mortar to enhance resistance against moisture, making them ideal for basements, lift pits, retaining walls, and water tanks. By integrating into the structure, they help avoid the need for surface-applied barriers and support long-term durability in wet or below-ground environments. Suitable for new-builds or demanding commercial projects, these admixtures form part of a broader range of waterproofing products in structural construction and infrastructure works.
Sika 1 Waterproofer Liquid Admixture
Sika 1 Waterproofer Liquid Admixture is an aqueous solution containing complex colloidal silicates. In the presence of water these swell and block the capillaries and pores in the applied sand/cement renders, screeds and mortar to provide an effective barrier against the transmission of liquid water. Features and Benefits Proven for more...
Visqueen IGW Admix
Used to provide Type B watertight concrete protection in accordance with BS8102:2022 in reinforced concrete basement walls and floors. Crystalline growth - provides continuous protection for the lifetime of the concrete structure Reduces water penetration - reduced permeability when compared to an equivalent plain concrete Improves...
Cromar AlphaChem 3 in 1 Admixture
Cromar AlphaChem 3 in 1 Admixture is a triple action admixture that waterproofs, plasticises and retards render mixes to assist workability and reduce water penetration. Allows larger areas to be covered in one application. Air entraining, chloride free admixture that waterproofs, plasticises and retards in one application Improves...
Fosroc Conplast UW
Fosroc Conplast UW is an underwater concrete admixture used to minimise washout of concrete placed underwater. When added to concrete, Conplast UW produces a gel in the water phase which surrounds the cement particles and other fine components of the concrete mix and protects them from excessive washout both during placement and once the...
Ronacrete Ronafix Universal
Admixture for thin bonded, floating and unbonded screeds and toppings. Applications include: Floor screeds, concrete repair Waterproof renders Slurry coats/levelling and protective Heavy-duty floor toppings Protection of steel reinforcement Bedding and bonding mortars Tanking and waterproofing Conforms to BS EN 934-2 Open to...
Fosroc Supercast CWA
Fosroc Supercast CWA (Crystalline Watertight Additive) is a crystalline growth, crack and capillary sealing, concrete admixture suitable for use in Type B (Integral) watertight concrete construction as defined in BS8102:2009 Designed for use as an integral waterproofing admixture for ready mixed concrete Supplied, pre-weighed in water...
Sika MaxMix Waterproofer
Sika MaxMix Waterproofer is a highly concentrated waterproofing and air entraining admixture for sand and cement which is 25 times the strength of conventional products. It forms extremely stable air bubbles in sand/cement mixes. This improves the workability of mortar/render giving it a “buttery” consistency and helps prevent shrinkage,...
Sika 4 Rapid Setting
Sika 4 Rapid Setting is a ready to use quick setting leak stopping liquid for use against low water pressure infiltration. It is used to aid the quick setting of cement based renders and concretes where low water pressure or slow moving water exists. Features and Benefits Ready to use Quick setting Prevents cement wash out Does not...
Fosroc Supercast Watertight Concrete Powder
Fosroc Supercast Watertight Concrete Powder (formerly Conplast WP402) is a hydrophobic, pore-blocking, concrete admixture suitable for use in Type B (Integral) watertight concrete construction as defined in BS 8102: 2009. Designed for use as an integral water resisting admixture for ready mixed concrete Based on a unique blend of fatty...
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Waterproofing Admixtures for Concrete and Structural Protection
Waterproofing Admixtures designed to enhance concrete performance by reducing its permeability from within. These admixtures are introduced at the batching stage, altering the capillary structure or chemically reacting to block moisture pathways. By preventing water ingress at the source, they provide an internal line of defence for critical structures such as foundations, water tanks, tunnels and retaining walls. Their role is especially valuable where membranes or coatings may be difficult to apply or maintain, offering a streamlined approach to long-term protection.
While they are often specified in the same projects, our range of repair admixtures serve a different purpose - restoring or strengthening damaged concrete rather than preventing moisture entry in new mixes. Waterproofing admixtures are used in fresh concrete to reduce reliance on external barriers and deliver built-in protection. This makes them an ideal solution for infrastructure works, basement construction, lift shafts and exposed decks where water contact is unavoidable and durability is essential.
Waterproofing Admixtures FAQs
Are waterproofing admixtures compatible with all types of cement?
Most are compatible with standard cement blends, but site conditions and mix design should be assessed before use.
Can these admixtures be used in exposed concrete finishes?
Yes, many are designed to perform without affecting appearance or finish, though always check individual product details.
Do they stop cracks from forming?
They help reduce water-induced cracking but are not substitutes for structural reinforcement or good design practice.
How are these admixtures added during mixing?
They are dosed by weight or volume during batching and must be evenly distributed for full effectiveness.