Here's how to choose the right structural waterproofing system.
When constructing below-ground structures like basements, tunnels and foundations, ensuring long-term protection from water ingress and ground gases is critical. Choosing the right structural waterproofing system isn't just about compliance with regulations - it's about safeguarding your investment, ensuring building integrity, and maintaining a safe, dry environment.
But with various waterproofing options available, how do you determine which solution is best for your project? Let's break it down...
Why Structural Waterproofing Matters
Waterproofing your structure isn't just an afterthought - it's an essential part of construction that protects against water ingress, dampness, and even harmful gases. For basement structures, this becomes even more critical, as these areas are vulnerable to seepage and flooding. By using the right system, you can:
- Safeguard against water damage and mould
- Ensure compliance with British Standard BS 8102:2022 for waterproofing performance
Grades of Waterproofing: What Does your Building Need?
The British Standard BS 8102:2022 outlines different grades of waterproofing performance based on the intended use of the structure. Understanding these can help you determine the level of protection your project requires:
Grade 1a: Seepage and dampness are tolerable. Ideal for structures where minor water ingress won't interfere with the use.
Grade 1b: No seepage, but some damp areas are allowed
Grade 2: No seepage, and minimal dampness is acceptable due to internal air moisture
Grade 3: Zero water ingress. Perfect for environments where even slight dampness could be problematic
Each grade offers a different level of protection, and choosing the right one depends on the intended use of your structure and the surrounding environment.
The Three Types of Structural Waterproofing Solutions
British Standard BS 8102:2022 also details three main types of structural waterproofing systems:
Type A (Barrier Protection)
A separate waterproofing membrane is applied to the structure. This can be installed internally or externally and can be pre-applied or post-applied.
Examples of Type A Products:
Maxiprufe Plus
Combi-Seal
Hydroprufe DPM
Type B (Structurally Integral Protection)
The structure itself is made water-resistant using reinforced concrete or watertight concrete additives, which also protect construction joints.
Examples of Type B Products:
Hydrocrete
Cemflex VB
Type C (Drained Protection)
This system incorporates an internal cavity drainage system with sump pumps to control water ingress.
Examples of Type C Products:
Hydroflow HP8
Hydroflow Channel
Combining Waterproofing Systems for Maximum Protection
For complex or high-risk environments, a combination of Type A, B and C systems is often used to ensure maximum protection. This is especially important for structures that need to meet Grade 2 or Grade 3 waterproofing requirements, or for sites dealing with ground gas risks or contaminated land.
How Premcrete Helps You Find the Right Solution
At Premcrete, we offer a comprehensive approach to structural waterproofing through our Prem360 service. We work with architects, structural engineers, and contractors to ensure the right waterproofing solution is implemented from concept to project completion. 
Concept Design: We engage early in the process to provide feasibility studies, budget quotes, and tender support. Our in-house team offers value-engineered solutions tailored to your needs.
Detail Design: Our CSSW-qualified team collaborates with your stakeholders to finalise the waterproofing strategy, ensuring compliance and mitigating risks.
Site Support: We offer hands-on support during installation, using our Premtrac system to maintain quality control and provide real-time reporting.
Project Delivery: We guarantee timely delivery of materials, backed by our in-house manufacturing and a 25-year warranty on installed systems.
For more information on how to choose the best waterproofing system for your project, visit our waterproofing solutions page or contact us today: sales@premcrete.com
Protect your substructure with the right waterproofing. Future-proof your building and enjoy peace of mind for years to come.
