Measure low spots across a roof in minutes using 3D photogrammetry models

Flat and low-slope roofing can be vulnerable water ponding. Even after 48 hours, lingering water can accelerate the deterioration of structural components such as waterproofing membranes, steel supports, and especially asphalt. 

If the ponding is due to poor maintenance, such as a leaking pipe on the roof, many asset insurance policies will not cover the damage. This can asset owners exposed; and engineers under pressure to identify and manage these risks quickly.

The risks of ponding across a roof

Structural stress: Standing water adds physical load, which can sag or deflect the roof deck.

Accelerated deterioration: Repeat exposure to water can accelerate the breakdown of water-proofing membranes, adhesives and steel supports. Asphalt is especially vulnerable.

Safety hazards: Detecting these issues typically requires rooftop access using ladders, ropes or EWPs. If the roof is already compromised, accessing the roof can be a challenge for engineers and is classified as high-risk construction work.

Low spots usually develop from a predictable set of issues: inadequate slope or drainage design, structural deflection and sagging, or blocked drains. 

But as these are hard to detect with the naked eye via a spot or representative inspection, identifying these problems ahead of time can be difficult.

A faster, safer way to assess low spots

Trendspek’s Surface Deflection measurement tool allows asset owners and engineers to identify and quantify ponding risks in minutes — without stepping onto the roof itself.

With your asset 3D modelled in Trendspek, the platform processes thousands of exact geospatial data points — including height, slope, length and volume — to generate a heatmap of roof deflection. 

Here’s how it works:

1. Digitally Outline the roof with a polygon and set accuracy levels.

2. Process thousands of data points to generate a heatmap visualisation of roof deflection.

3. Pinpoint low spots with precise geospatial, height, and volume metrics.

4. Collaborate instantly by exporting results as PDF or CSV, or sharing directly with contractors.

This allows you to move from a high-risk inspections to a complete, data-backed assessment, in less than five minutes.

What’s wrong with ladders?

Adopting a digital-led method to roof inspection isn’t just about convenience. 

It’s about protecting people, buildings, and budgets.

• Prevent costly damage by spotting low spots before it becomes structural or water damage.
  
  
• Strengthen compliance and insurance outcomes with auditable records of proactive maintenance.
  
  
• Improve safety by eliminating risky work-at-heights while still achieving full coverage.
  
  
• Optimise lifecycle planning using precise data to guide repairs and long-term capital works.

Safeguard your assets

Whether you’re responsible for maintaining assets or delivering engineering assessments, Trendspek’s Surface Deflection tool gives you the defensible data you need to detect risks earlier, protect insurance outcomes, and keep assets performing for the long term.