Exterior Waterproof Sealant

Waterproof Sealant Exterior for protection against moisture damage and general degrading

No matter what the scale or purpose of your exterior construction project, waterproofing your installation is crucial to the longevity and durability of your build. 

From large bridge structures and underground tunnels, to roofing a building, selecting the correct waterproof sealant that addresses the demands of your exterior construction is an important decision. 

At Bostik, we design and manufacture a variety of smart products to assist you with your project, helping you to prevent the ingress of moisture and degradation that often occurs over time to installations that are open to the elements.

If you would like technical support on the optimal solution for your exterior waterproofing needs, contact our experienced and knowledgeable technical support team for professional consultation.

Waterproof sealant exterior: sealant applications

At Bostik, our intelligently engineered sealant range is formulated for a variety of applications, so whether you are repairing a leak or waterproofing the exterior of a new building, you’ll find a product suited to your individual needs.

If you are working on foundations or works below the ground such as tunnels and bridge footings, defending your installation from water ingress is crucial. Choosing the right waterproof Bostik sealant can prevent structural damage caused by the freezing, thawing and cracking of moisture pockets.

In order to achieve the highest compatibility with brickwork, blockwork, expansion and construction joints, our waterproofing technologies are specially designed to work with a multitude of substrates. Concrete, sand, cement, timber, metal and cement board are just some of the materials you can strengthen against weather and water with Bostik products.

Most of our sealants designed for exterior application are low modulus solutions, providing good levels of flexibility and elasticity. We also manufacture smart solutions that can bond to already wet surfaces, or sealants that are cured by the moisture in the air – these work especially well with surface membranes.

Some products specific to roof sheets, gutter sealants and similar applications possess fantastic slump resistance and boast a minimum lifespan of up to 10 years. In addition, all our sealants are highly durable, minimize shrinkage and odor output, and allow for carefree overpainting.

Waterproof sealant: sealant technologies

Silyl modified polymer (SMP)

Our SMPs are acid-free, and perfect for a wide range of waterproofing installations. Bostik’s silylated modified polymers are capable of bonding to the same variety of substrates as a standard silicone sealant, but possess a much higher bond and peel strength.

Learn more about our silyl modified polymer products

Bitumen sealant

Our bituminous sealant solutions possess excellent resistance to water, dilute acids and alkalis, alcohol, and most salt solutions. This makes them ideal for waterproofing, particularly when using roofing materials.

Cementitious sealant 

Our range of cementitious sealant are ideal for working with swimming pools and other interior assemblies composed of tiling or tile-based substrates. We also produce cementitious products that are formulated specifically to combat positive water pressure.

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Waterproof sealant for interior and exterior waterproofing


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