Posts Tagged ‘design’

How To Prevent Basement Waterproofing Failures

June 2025 Newsletter

June 25 newsletter

Basement waterproofing failures cost the UK construction industry millions of pounds every year—not just in repairs, but in project delays, reputational damage, and client dissatisfaction. The most frustrating part? These failures are entirely preventable.

At MacLennan, we’ve spent decades refining our approach to waterproofing design, installation, and maintenance. In this post, we’ll explain how we prevent failures before they happen—and why our systems are trusted across the UK and beyond.

It All Starts with Smart Design

Most waterproofing failures can be traced back to one root cause: poor design. At MacLennan, we believe that good design is the foundation of waterproofing success. But we’re not just talking about detailing—we mean integrating the installation process, maintenance strategy, and repairability into the design from day one.

The British Standard and all major codes of practice are clear: waterproofing systems must be designed with repair and maintenance in mind. Yet, many systems are installed without any consideration for how they’ll be accessed or serviced once finishes are in place.

🧱 Why Type C Systems Are the Gold Standard

If your basement includes finishes, internal walls, or linings, then only a Type C cavity drain system can provide the level of repairability required for long-term performance.

Unlike other systems, Type C solutions are designed to manage water ingress by directing it to a controlled drainage system. But even these systems can fail—if they’re not properly maintained.

🔍 Inspection & Servicing: The MacLennan Difference

Most service providers focus on pump maintenance, but the real Achilles heel of a cavity drain system is the drainage channel. If this becomes blocked or compromised, the entire system is at risk. At MacLennan, we’ve solved this with:

  • We design and manufacture our own inspection ports, allowing directional camera access for full visibility.
  • We commission and inspect the system after finishes are installed—when many issues first appear.
  • We provide ongoing servicing through our dedicated in-house team, ensuring long-term performance.

📡 Remote Monitoring & Superyacht-Grade Reliability

We’ve taken it a step further with remote monitoring technology built into our systems. This allows us to track performance in real time and alert clients to potential issues before they become problems.

And when it comes to power reliability, we use state-of-the-art battery backups and inverters—the same systems trusted on ocean-going superyachts. These can even be upgraded to power essential services during outages.

🛠️ Servicing Is Not Optional—It’s Essential

You wouldn’t buy a car and never service it. A waterproofing system is no different. Regular maintenance is the key to preventing failures, and it should be built into the design from the start.

At MacLennan, we don’t just install systems—we design them for life.

💬 Want to Learn More?

We’re passionate about helping clients avoid costly waterproofing failures. If you’re planning a basement project or want to ensure your current system is protected for the long haul, get in touch with our team.

concrete deck and buried roof CPD advice

New CPD!

We are now offering a CPD on the Waterproofing Design of Concrete Decks and Buried Roofs.
All your design team needs to know on this very specialist subject will be covered in a 1-hour LIVE online CPD.
What is covered:
– How to design a deck or buried roof for waterproofing – Materials options for waterproofing Buried decks and roofs – Environmental conditions critical to waterproofing – Financial considerations with Winter work – How to prepare for waterproofing – Our best advice on systems – Testing and quality control – Guarantees and protecting the client.
To book email cpd@maclennanuk.com
RIBA CPD Waterproofing promotional image

Our CPD is now RIBA approved!

MacLennan is very proud to have achieved the approval from the Royal Institute of British Architects which goes to show they appreciate the expert opinion of an independent waterproofing specialist.   Our CPD covers all aspects of waterproofing design and installation, including different types of waterproofing, legal precedence affecting the design, failed systems, remedial options and most importantly – how to avoid pitfalls and protect your client. When it comes to waterproofing, there is much more to consider than purely the materials you choose. We are an independent firm who insist there should be no split liability when it comes to waterproofing.   Our CPD diary is booked up for September, we are open for bookings from October. If your team are designing basements, they would hugely benefit from our RIBA approved CPD, gaining double points. To book, please fill out a FORM.   We are currently providing seminars in person in your offices or over Zoom (or Teams) conference.
Design meeting at MacLennan headquarters

Waterproofing, Better by Design.

ian scroggins

Ian Scoggins CSSW

I have worked in the construction industry for 28 years and have been specialist waterproofing surveyor for 12 years, my time as a waterproofing specialist has given me a rounded experience of the industry.

During that time in the industry, I have seen projects that have gone very well and some not so great.

Based on my personal experiences, I have come to realise that its early engagement and collaboration with the overall design team that delivers the best results. By everyone investing time in early engagement, I find that designs can often be simplified as sitting around a table and everyone giving their input can often take out expensive complexity and give a much better overall solution, that ultimately benefits the end client.

This only works when the correct sub-contractors are engaged on project early, so they are associated with the project from day one, one thing that sets us apart from manufacturers offering technical support is that we are involved in projects on-site every day and know the practical solutions to problems that aren’t always evident when looking at a drawing.

When it comes to high-risk elements like the basements and waterproofing, going out for multiple tenders and the lowest bidder often leaves you with skills and scope gaps as there is a clear lack of ownership. It can then become about delivering a solution to a budget, rather than a simple but effective solution that works with all the other key partners on the project in mind that’s actually deliverable on-site.

This doesn’t mean the client shouldn’t benchmark the competition and capabilities, as I live in the real world and want to offer real value for money to my clients but I want to do this without them un-intentionally building in unnecessary risk by accident by being insightful and helpful early on. It’s what falls between the cracks where the real risks sit (no pun intended) that really sets out your specialist subcontractor as part of a collaborative team that makes all the difference.

"My role is as much about sleeping well at night, as it is about waterproofing."

As myself, my MD, our insurance company, the main contractor and my end client all want to never ever worry about what the waterproofing is doing as it’s a hidden system in their beautiful property that just does what its supposed to. Its why our company takes full design and solution responsibility and hold genuine guarantees as we offer our clients leak free basements from a waterproofing perspective rather than material warranties.

If you found this blog helpful or would like to hear more technical advice, try booking a CPD with MacLennan! We offer free, lunch provided 1 hour CPD's at your premise.


CPD Booking Form

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Flood season is approaching

We are getting into that time of year where we will be called on to protect homes from the dreaded floods.

flooded houses

   
MacLennan waterproofing have a number of strategies for this. We always try and reduce the problem with external works if possible. This can include barriers, pumped systems and breathable water repellents as well as the repair of defects in pointing, service entries etc.Internally we make the property as watertight as possible and then install a cavity water management system with sealed sumps and pumps on the outside.

See Flood Control Systems click here

See Flood Control Case Studies click here
 

Here is an example detail, click on the picture below:

image001

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0330 3200 240
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