On a drawing, a waterproofing detail can look perfect.
The membrane is continuous. The interfaces are clearly defined. Every junction, penetration and transition has been considered. Technically, the solution works.
And then it reaches the site…
Suddenly, real-world delays are introduced. Access is tighter than anticipated. There are clashes on site and practical limitations. And, as ever, the programme keeps moving.
This is where the difference between a waterproofing detail that works in theory and one that is genuinely buildable becomes clear.
At Premcrete, we know that successful waterproofing design has to consider both. A system needs to deliver the required level of protection, but it also needs to be practical to install under real construction conditions.
Because, ultimately, a waterproofing detail is only as successful as its execution.
What Does 'Buildable' Actually Mean?
Buildability is relatively simple in principle: can the proposed detail be constructed safely, correctly and consistently on site?
For waterproofing, however, there’s another important consideration: can it be constructed while maintaining the continuity and integrity of the waterproofing system?
That means looking beyond individual lines on a drawing and considering how the detail will actually come together.
Can the installer physically access the area? Can the membrane be applied and sealed correctly? Does the construction sequence allow the waterproofing to be completed at the right time? What happens where it meets another system? And can the completed installation be inspected before subsequent works cover it?
These considerations matter as to whether the project involves a relatively straightforward damp-proof membrane installation or a complex basement waterproofing membrane installation.
Good design answers these questions before they arise on site.
Construction sites are inherently dynamic environments.
The reality is that designs develop, programmes change, and multiple trades work alongside one another. Especially when it comes to complex below-ground structures, space can be at a premium.
None of this negates the need for correct installation. What it does mean is that waterproofing details should be developed with those conditions in mind.
Take access, for example.
A detail might require a membrane to be installed around a junction or sealed around a penetration. On a clean, theoretical drawing, there is plenty of space to do so. However, once reinforcement, formwork, temporary works and services are introduced, the available working area may look very different.
Sequencing presents a similar challenge.
Waterproofing doesn’t exist independently of the structure around it. The point at which a membrane is installed can be influenced by concrete works, reinforcement, drainage, services and other elements of the build.
For a successful basement waterproofing membrane installation, these interconnected relationships need to be understood long before construction reaches this critical detail.
Otherwise, the site team can find themselves trying to solve a design problem at exactly the point when time and options are most limited.
There’s another reality that cannot be ignored: construction programmes are demanding.
This is never an excuse for compromising waterproofing installation to save time… quite the opposite: it’s an argument for designing details that can be installed efficiently and correctly in the first place.
Every unnecessary interface, difficult transition or overly complicated installation stage introduces another variable. Under programme pressure, those variables can quickly become risks.
A simpler detail can reduce the number of operations an installer needs to complete, make the correct installation sequence clearer and provide better opportunities for inspection and quality assurance.
In other words, simplicity isn’t about reducing performance; it’s about removing unnecessary complexity while protecting performance.
That distinction is important.
Bring Installation Experience Into the Conversation Earlier
One of the most effective ways to improve buildability is also one of the simplest: involve the right people early.
Waterproofing design specialists, manufacturers and experienced installers bring a different perspective to the design process because they understand how a proposed system behaves beyond the drawing.
An installer may immediately recognise that access to a particular junction will be difficult.
A manufacturer can advise how its products should transition through an unusual interface.
A waterproofing design specialist may identify that changing the sequence could make the same detail considerably easier to execute.
These conversations are far more valuable at the design stage than they are when the concrete pour is approaching.
That doesn’t mean designing around poor workmanship; competence remains fundamental to successful waterproofing installation.
Instead, it means creating details that enable competent installers to do their job correctly and consistently.
At Premcrete, our approach has always been built around working closely with the people specifying and using our systems. It’s this close working connection between design, product knowledge and site experience that gives us a clearer understanding of what projects need in practice… not simply what works on paper.
That’s also why we have developed a unique design tool, bringing both clarity and confidence to the waterproofing process. Through interactive PDF drawings, layered configuration, guided product selection and automatic product key updates, project teams can seamlessly visualise, plan and tailor the details to their specific needs.
Some of the most important waterproofing details are also the points where different elements of a building meet.
Think slab edge detailing, construction joints, pile caps, service penetrations, transitions between waterproofing and gas protection systems.
Each creates an interface that needs to be considered as part of the wider waterproofing strategy.
A pipe penetration, for example, isn’t simply a hole through a wall. From a waterproofing perspective, it’s a break in what is an otherwise continuous barrier that needs to be properly detailed and executed.
The same principle applies to a damp-proof membrane installation. The performance of the membrane itself is only one part of the equation; laps, junctions, penetrations and connections to adjacent protection measures all contribute to the integrity of the finished system.
Coordination therefore matters.
Who completes the detailing? At what stage? Which trade follows afterwards? Could later works damage or penetrate the membrane? Can the installation be inspected before it’s concealed?
Resolving these questions early reduces ambiguity and gives everyone involved a clearer understanding of how the waterproofing strategy should be delivered.
Complexity can sometimes be unavoidable. Basements are very rarely perfect boxes, and modern buildings contain a wide range of services, interfaces and structural challenges.
But simplicity is the goal, and complexity should never exist without a reason.
Every additional overlap, transition, joint or site-fabricated component can introduce another point at which something needs to be executed correctly.
A well-considered waterproofing plan seeks to reduce these variables.
This could mean creating a clearer route for a membrane through every corner, simplifying the transition between systems or considering the location of penetrations before installation begins.
The objective isn’t simply to make life easier for the installer, although that is valuable.
Instead, it’s to make the desired outcome more repeatable.
As a result, the project team can have greater confidence that what was designed is what has actually been built.
That is risk reduction through design.
Design for the Site, Not Just the Drawing
So, what should project teams be asking when reviewing a waterproofing detail?
Start with the practical questions.
Can the installer physically reach every part of the detail? Is there sufficient space to form the required seals and connections? Can it be completed in the proposed construction sequence? Have reinforcement and service clashes been identified and considered?
Then look at continuity.
Does the waterproofing remain continuous through every junction, penetration and change in level? Where different systems meet, is that transition clearly defined?
Finally, think about what happens afterwards.
Can the detail be inspected before it’s covered? Is there a risk of following trades damaging the installation? And does everyone involved understand their responsibility for maintaining the integrity of the system?
These may sound like simple questions.
That’s precisely the point.
Good waterproofing detailing doesn’t need to make construction more complicated; it should make the route to a successful installation clearer.
Buildability Should be Designed In
Waterproofing performance begins long before a membrane is installed.
It begins with understanding the structure, identifying the risks and developing details that work not only technically, but practically.
When waterproofing is considered early, specialist expertise is brought into the conversation, and unnecessary complexity is designed out, the site team is placed in a much stronger position to deliver the intended result.
For us, this is what makes a waterproofing detail truly buildable.
Not simply that it can be drawn. But that it can be understood, installed, inspected and relied upon.
At Premcrete, we work closely with designers, contractors and specialist installers to help turn waterproofing strategy into practical, project-specific solutions. If you’re developing a below-ground waterproofing design or have a challenging detail that needs resolving, speak to our team today.
Because the best time to solve a difficult waterproofing detail is before it becomes reality.