Independent construction monitoring.

The design intent is usually sound. The leak comes later, during the build, when the design gets value-engineered, substituted, or detailed by people without waterproofing depth, and signed off with no specialist in the room. That gap is where we work.

On a design-and-build basement, waterproofing is usually handed down as a Contractor Designed Portion. The contractor takes the performance specification, develops the Stage 5 design, warrants it, and builds it. On paper, that's tidy. In practice, it's where the risk concentrates, because once the build starts, the people watching the works are the core design team, and waterproofing falls down the gap between them. No one on that team owns it to specialist depth.

So everyone assumes the waterproofing is covered. Often, no one is actually watching it.

Construction monitoring is needed during RIBA Stage 5 (Construction), from the start of waterproofing installation through to practical completion and handover. The monitoring scope is defined before construction begins, typically as part of CLW's appointment terms, and is coordinated with the contractor's programme to ensure CMT attendance during critical waterproofing operations.

Construction monitoring is needed on every commercial development where waterproofing works are being carried out. The scope and intensity of monitoring varies, from advisory monitoring (a defined number of targeted site visits) to formal CMT (comprehensive inspection with defined hold points), depending on the complexity of the waterproofing works, the experience of the appointed contractor and the consequences of waterproofing failure.

We don't sell product. We don't work for the contractor or the supplier. So when we tell you a substitution is a bad idea, it's because it's a bad idea, not because it threatens a sale.

A supplier will give you an answer shaped by the product they're trying to sell. We have nothing to sell but the outcome. On a serious basement, that difference is the whole point.

The fee for keeping us client-side through construction is a fraction of the cost of a single leak found at practical completion, before you count the programme delay, the finishes ripped out, the dispute, and the conversation with your client about why their new asset is wet.

On a major commercial basement, our involvement typically returns several times its cost in risk reduced and waste removed.

Construction monitoring is the final stage of CLW's involvement in the design-to-delivery chain. It verifies that the structural waterproofing design philosophy has been implemented on site, that the performance specification requirements have been met, that the contractor appointed through the waterproofing procurement strategy has delivered the expected quality, and that the collaborative working established during the PCSA phase has translated into a compliant installation. The findings from construction monitoring also feed back into CLW's design practice. Installation observations inform future design decisions and specification refinements.