On a live site, water damage rarely arrives as one neat category. A split on a riser or a standpipe left running can flood a plant room in an afternoon, and a decent flow monitor will usually flag it. Moisture sitting inside a CLT panel, or a slow ingress under a flat-roof membrane, is a different beast: no spike at the meter, often no stain on the ceiling yet, and plenty of time for insulation, decking, or timber lamella to absorb damage while the programme still looks on track.
Both paths end in rework, slipped handover dates, and awkward conversations with insurers and clients. The frustrating part is that many projects still spec one type of protection and treat the other as “someone else’s trade.”
Quensus has partnered with Tector so teams can scope LeakNet flow monitoring and embedded moisture sensors through a single route. Flow covers pipework and site supplies; probes in timber and roof build-ups cover what a meter cannot see
You can learn more about how we are working together here.
Looking beyond pipe leaks
Escape of water is still one of the costliest property risks in the UK. The Association of British Insurers (ABI) routinely cites burst pipes and leaks among the largest drivers of home and commercial claims. On many schemes, the FPA Joint Code of Practice (JCOP) for Escape of Water is the document insurers and risk teams reach for when they ask what prevention should look like at design stage, not only after a loss.
LeakNet is built for that mains-side risk: learning-mode flow analytics, alerts when usage drifts from normal, and automatic isolation where the project specifies it. That aligns with a prevention-first approach rather than waiting for visible damage. Broader leak detection and smart water monitoring use cases on commercial and residential portfolios follow the same logic.
CLT and flat roofs break the assumption that “if nothing is flowing abnormally, we are fine.” Panels can pick up moisture in the factory, on the lorry, or under a tarp that blew loose. Wet trades and open façades add more while the structure is exposed. On a membrane roof, water can sit in the build-up long before it shows internally, and it never has to pass through the building’s pipework at all.
In those situations the useful question is not litres through the meter. It is what is happening inside the material. Tector’s screw-in probes read moisture deeper in the CLT lamella than a surface check can, and sensors in the roof assembly can pick up ingress under the waterproofing layer. Quensus helps place that monitoring alongside LeakNet so both signals are planned before close-in, not bolted on after a gateway review goes wrong.
Why this matters for CLT projects
Mass-timber programmes live or die on encapsulation timing. Close in too early and moisture that looked “about right” on a handheld meter can stay trapped behind linings. Mould, dimensional movement, and insurer pushback are the usual outcomes; so is stripping finishes to prove what happened.
A single spot reading at the panel face is a snapshot. A trend through wet trades, heating, and ventilation tells timber engineers whether drying is actually progressing toward a safe envelope. On many UK schemes, around 20% wood moisture content is treated as the point where encapsulation needs serious scrutiny; watching the curve beats guessing that “another week” will be enough.
That evidence also helps at handover when someone asks whether panels were dry enough at close-in. It supports programmes that need auditable performance, including BREEAM WAT03 leak detection and flow control, where documentation matters as much as hardware.
Flat roofs present a different problem
Flat roofs fail quietly. Water under a membrane can soak insulation and deck while the occupied space below still looks fine. By the time a ceiling tile stains, several layers may already need replacing, and downstream apartments or teaching wings get dragged into the same remediation.
Embedded moisture monitoring is the complementary layer: sensors in the build-up that move when conditions change, giving the roofing contractor and main contractor a chance to open up the right zone before the loss spreads.
The same buildings still need riser and plant protection. Offices, schools, and residential blocks with podium or terrace roofs often end up with flow monitoring in the wet areas and almost nothing on the envelope until a leak proves expensive. Planning both at once closes that gap.
One project, two types of information
Using two sensor types on one site is not the point. The point is designing coverage before trades start arguing about who missed what.
On a typical CLT or hybrid job, responsibilities splinter quickly. M&E owns escape of water. The timber engineer owns drying. The roofer owns the membrane. The client, insurer, and FM team want one coherent story at PC. When those workstreams stay separate, you often get strong protection in the plant room and occasional moisture checks in panel zones; monitored permanent supplies but not the temporary standpipe; a roof spec that assumes visual inspection is enough.
Coordinated scoping through Quensus maps LeakNet to risers, plant, temporary supplies, and occupied areas, and Tector coverage to CLT panels and roof zones where hidden moisture is material. Alerts can go to the people who can act, and thresholds can be agreed with the timber supplier and insurer early rather than improvised on site.
Where schemes already reference escape-of-water mitigation, for example through our Aviva Risk Management Solutions partnership, specifying moisture alongside flow avoids a last-minute addendum when the risk surveyor asks about timber at practical completion.
Better information during construction
Contractors usually care about one thing: not stopping the job. A moisture rise caught while panels are still open might mean ventilation, heat, or a local repair. The same issue after linings, ceilings, and kitchens are in is a different contract entirely.
Shared data gives the site team something to react to between formal inspections. If a probe trends upward after a weekend of rain, someone can walk the zone. If drying is steady, the timber engineer has a basis to release the next trade. If a temporary supply starts running at 3 a.m., LeakNet can notify the duty manager before the ground floor is underwater.
Good waterproofing, sequencing, and water management on construction sites (including Considerate Constructors expectations) still do the heavy lifting. Monitoring fills the gaps between visits, when nobody is on site to hear water move.
Supporting a clearer handover
Water risk does not vanish at practical completion. New builds often sit part-occupied or empty for months: systems live, heat on frost stat, few eyes on the corridors. Our Handover Vulnerability Gap piece describes why that period concentrates financial exposure, and why flow data matters when occupancy is thin.
LeakNet can stay on the permanent installation with alerts and shut-off as specified. Moisture records from construction then become part of the handover pack: not only a line in a report saying panels were dry, but a time-stamped history of how they dried. That helps clients, warranty providers, and insurers when someone later asks whether moisture entered before close-in or after a roof defect.
Vacant-phase pipe risk spikes in winter; see winter escapes and frozen pipes in vacant new builds for how flow monitoring limits damage when nobody is there to shut the valve by hand.
Planning monitoring from the start
The cheapest time to decide probe positions and roof sensor routes is before encapsulation, while panel layouts and build-up drawings are still negotiable.
Design and pre-construction
Agree monitored zones, probe and sensor locations, alert recipients, and what happens when a threshold is breached. Align with insurer and timber supplier requirements so “stop work” means the same thing to everyone.
Fabrication and delivery
Baseline moisture when panels leave the factory or arrive on site. If readings jump in transit or storage, that is visible before the crane sets the panel.
Construction and fit-out
LeakNet on temporary and permanent supplies; moisture trends through wet trades and before linings close. Where needed, integrate visibility with FlowReporter for portfolio or FM teams.
Handover and vacancy
Flow protection while the building is complete but lightly occupied; export moisture history for the client file.
Occupation
Ongoing escape-of-water analytics and isolation where configured; optional continued monitoring on critical roof zones.
What the Quensus and Tector partnership provides
Through Quensus, a project can combine:
LeakNet flow monitoring, alerts, and automatic shut-off where configured
Embedded CLT moisture monitoring using Tector screw-in probes
Flat-roof build-up monitoring for ingress under the membrane
Construction and occupation phases in one scoped plan
Records for handover that support insurer, client, and warranty conversations
Single commercial route instead of two vendor silos mid-programme
Pipe leaks, timber momsture, and roof ingress stay different physics, but they can sit in one water-risk strategy. On schemes where insurers and clients expect evidence across the building lifecycle, that unified view is increasingly what gets specified.
From construction into operation
Quensus treats leak prevention as a lifecycle issue, not a day-one occupancy checkbox. Temporary site supplies leak. Timber gets rained on. Roof membranes get punctured during follow-on trades. Finished buildings sit empty before tenants arrive. The failure mode changes each month; the need for visibility does not.
Pairing flow monitoring with embedded moisture monitoring covers more of that journey, from first fix through handover and into stable operation, without asking the project team to maintain two unrelated monitoring stories.
Further reading & sources
Discuss your project
Delivering mass timber, flat-roof, or mixed-structure work and need both flow protection and embedded moisture monitoring? We can help you scope what belongs on your layout and programme.
Speak to the Quensus team or read more on the CLT & flat roofs solution page.
