Why Early Waterproofing Strategy Matters More Than Ever

Waterproofing Is No Longer Just a Product Selection

Historically, waterproofing has sometimes been viewed as a later-stage package or product decision. However, under the Building Safety Act, this approach presents increasing risk.

Waterproofing forms a critical part of the building envelope and directly impacts:

• durability
• structural integrity
• long-term building performance
• occupant wellbeing
• future maintenance obligations

As a result, there is growing focus on ensuring waterproofing strategies are:

• properly designed
• clearly coordinated
• fully documented
• competently reviewed
• traceable throughout the project lifecycle

This is particularly important on higher-risk buildings and complex basement structures where failure can have significant long-term consequences.

The Importance of the “Golden Thread”

One of the core principles of the Building Safety Act is the requirement for a clear and accessible “Golden Thread” of information.

In practical terms, this means project teams must be able to demonstrate:

• why a waterproofing system was selected
• how the system was designed
• how interfaces were coordinated
• who accepted design responsibility
• what products were installed
• how installation quality was monitored

For waterproofing systems, gaps in information or unclear responsibility can create significant project risk later in the building lifecycle.

Early engagement and clear technical coordination are therefore becoming increasingly important.

Coordination Between Below and Above Ground Waterproofing

One area receiving greater scrutiny is continuity between below-ground and above-ground waterproofing systems.

Building Safety Inspectors are increasingly looking for:

• coordinated waterproofing details
• continuity of protection
• clearly defined interfaces
• compatibility between systems
• robust detailing around movement joints, penetrations and transitions

This is especially relevant at:

• podium interfaces
• retaining wall transitions
• façade junctions
• lift pits
• service penetrations
• movement joints

Without early coordination, these interfaces can become vulnerable points for future water ingress and remediation.

Gateway 2 & Design Accountability

Gateway 2 has introduced greater emphasis on demonstrating that designs have been properly developed before construction begins.

For waterproofing, this reinforces the importance of:

• early design involvement
• fully considered waterproofing strategies
• detailed specifications
• clear system build-ups
• coordinated drawings
• defined responsibilities

Waiting until construction is underway to finalise waterproofing details can increase programme pressure and introduce avoidable design risk.

A coordinated waterproofing strategy developed during the design phase helps support smoother project delivery and clearer compliance documentation.

Competence & Qualified Waterproofing Design

The Building Safety Act places increased emphasis on competence across all areas of design and construction.

For structural waterproofing, this reinforces the importance of engaging experienced professionals with a strong understanding of:

• BS 8102:2022
• groundwater risk assessment
• waterproofing system selection
• combined protection strategies
• detailing and buildability
• long-term structural performance

One recognised benchmark within the waterproofing industry is the Certified Surveyor in Structural Waterproofing (CSSW) qualification.

Developed by the Property Care Association, the CSSW qualification demonstrates specialist knowledge in below-ground waterproofing design and compliance with current industry guidance and standards.

As projects become increasingly scrutinised through Gateway 2 and wider Building Safety Act requirements, competence-led waterproofing design is becoming more important than ever.

Early engagement with CSSW-qualified waterproofing specialists can help improve coordination, reduce risk and support compliance documentation throughout the project lifecycle.

At PUDLO Products Limited, our technical team includes CSSW-qualified professionals who support project teams with coordinated waterproofing design, technical guidance and on-site support from early-stage design through to project completion.

Common Waterproofing Risks Under the Building Safety Act

As the industry adapts to increasing regulatory scrutiny, several common waterproofing risks are becoming more closely examined during both design and construction phases.

These can include:

• unclear waterproofing design responsibility
• late-stage specification changes
• uncoordinated detailing between trades
• incomplete compliance documentation
• lack of inspection records
• product substitutions during construction
• poor continuity between below and above ground waterproofing systems

Addressing these risks early through coordinated design and clear technical oversight can help reduce future remediation issues and support a more robust compliance process.

Reducing Risk Through Early Engagement

Early engagement with waterproofing specialists can help project teams:

• identify potential design risks sooner
• improve coordination between trades
• support compliance documentation
• reduce future remediation risk
• simplify technical approvals
• improve continuity between systems

As regulatory expectations continue to evolve, waterproofing design is becoming an increasingly important part of wider building safety strategy.

Supporting a More Accountable Construction Industry

The Building Safety Act represents a wider industry shift towards improved accountability, traceability and long-term performance.

For waterproofing, this means moving beyond simple product selection towards fully coordinated design-led solutions that support both compliance and long-term durability.

At PUDLO Products Limited, we work with project teams from early-stage design through to on-site support, helping deliver coordinated waterproofing strategies backed by technical expertise, detailed design support and long-term performance considerations.

Need Support With Waterproofing Design?

Whether you are reviewing a basement waterproofing strategy, navigating Gateway 2 requirements or looking to improve continuity between below and above ground waterproofing systems, our technical team can help.

Contact us to discuss your project requirements on 01480 756888 or drop us an email on sales@pudlo.com.