What Are Cementitious Coatings?
Cementitious coatings are a category of Type A waterproofing materials designed to provide waterproofing protection to building structures by creating a durable, waterproof barrier on the surface. These coatings are applied directly onto concrete, masonry, or other substrates to prevent water penetration and protect against moisture-related damage.
The thin, cement-based formulations are applied as a liquid or slurry onto surfaces to form a waterproof membrane when cured. These coatings typically consist of Portland cement, fine aggregates, polymer modifiers, and water-reducing agents to improve adhesion, flexibility, and waterproofing properties.
Characteristics of Cementitious Coatings
Waterproofing Properties: Cementitious coatings provide excellent waterproofing protection by forming a seamless and continuous barrier on the surface, effectively preventing water penetration and ingress into the substrate.
Breathability: While the coatings create a waterproof barrier, they are also breathable, allowing moisture vapour to escape from the substrate. This helps to prevent trapped moisture and reduces the risk of blistering or delamination.
Adhesion: Cement-based coatings adhere well to properly prepared concrete, masonry, and other substrates, providing a strong and durable bond. Surface preparation, such as cleaning, etching, and priming, is essential to ensure proper adhesion.
Flexibility: Some cementitious coatings are formulated with polymer modifiers to enhance flexibility and crack-bridging properties. This allows the coating to accommodate minor substrate movement and thermal expansion and contraction without cracking or delaminating.
Durability: Cementitious coatings are durable and resistant to weathering, UV exposure, and chemical attack, making them suitable for exterior and interior applications. Proper surface preparation, application, and curing are essential to maximise durability and longevity.
Applications and Considerations for Cementitious Coatings
Cementitious coatings are commonly used for a variety of waterproofing applications, including: Exterior and interior walls; Below-grade foundations and basements; Retaining walls and planter boxes; Swimming pools and water features; Roof decks and balconies; and Parking garages and podium decks.
When choosing and using a Type A cementitious coating however, there are some important factors to take into consideration:
Proper surface preparation is essential for adhesion and performance.
Application thickness and curing conditions impact waterproofing effectiveness.
Compatibility with other construction materials and systems should be considered.
Consult manufacturer guidelines and specifications for proper application and performance requirements.
Contact BaseTec - Complete Systems. Reliably Delivered.
If you require assistance with cementitious coatings or need advice on which cementitious coating product is best suited for your requirements, contact our friendly teams in Kent - 01732 906 826 - or Leeds - 0113 521 6789.
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