Reading a Roof's Condition History From Space
Zack Butler
Most roof decisions are made from a single inspection: someone walks the roof, takes photos, and writes a recommendation. That snapshot matters, but it misses the most useful thing an owner can know — how the roof got here.
Why history beats a snapshot
A roof that has looked the same for eight years and a roof that has degraded sharply in the last two can photograph almost identically today. Their futures are very different. The first may be a coating candidate; the second is telling you something about drainage, traffic, or mechanical penetrations that a coating will not fix.
Building the record from imagery
Through our Pulsix research, we trace each roof section from historical satellite imagery and track it over time: surface reflectance, ponding patterns, new equipment and penetrations, patches, and repairs. The result is a degradation curve for each section rather than a single condition grade.
What the curve tells us
- Rate, not just state. A steepening curve flags sections to prioritize even if they still look serviceable.
- Cause. Changes that line up with new rooftop units or added traffic point to a mechanical or access fix, not just new membrane.
- Energy. Darkening and lost reflectivity raise cooling load underneath — which matters most on data centers and other cooling-heavy buildings.
From curve to scope
The history does not replace a site visit; it focuses it. We use it to decide where to core, what to photograph, and whether repair, restoration, or replacement belongs in the lifecycle plan. Then the field documentation from our own crews — photos and readings checked against manufacturer references — closes the loop.
You can see roof sections modeled alongside cooling and power systems in our public data center case study.
Pulsix is not affiliated with the campus owner or operator. Every figure in the case study is labeled observed, modeled, or owner-required, and nothing here is an assessment of how the facility is actually run.
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