S-One roof deflection monitoring

Measures how much your roof structure deflects under snow and rain load, around the clock. A laser inside the building measures the roof girder at mid-span, so the floor below stays free and your team hears about a growing load while there is time to act.

Let's talk about your building See how it works

S-One sensor on a steel bracket at a roof support inside a warehouse, status light on

±0.04 in

Accuracy (±1 mm)
3 min

Between readings, around the clock
197 ft

Maximum roof span (60 m)

How it works

S-One is a laser sensor mounted inside the building, on a bracket at a structural support of the roof. It aims at a target board fixed to the same girder or truss at mid-span. When snow or water loads the roof, the member deflects and the distance S-One measures changes.

The laser measures in the plane of the roof, high up under the deck, so the floor below stays free for your operations.
A built-in inclinometer corrects every reading for sensor rotation and keeps track of how plumb the supporting column stays.
Every 3 minutes a reading travels over a self-healing wireless mesh network to the S-One gateway and on to the Smart Roofs Platform.
When deflection crosses a predefined threshold, the platform sends SMS and email alerts to your team.

Target board bolted to a roof truss at mid-span, with the red dot of the S-One laser on it — The target board at mid-span. The red dot is the S-One laser.

S-One sits at the support and aims at a target board at mid-span. As the girder deflects, the measured distance changes.

What your site team gets

Early warning

You hear about a growing load while there is time to act, before the structure approaches its limit state.
The effect on the structure itself

Snow of different consistency and soaked insulation load a roof very differently. S-One measures how the structure responds to the load it actually carries.
Fewer roof inspections

Continuous readings reduce the need for expensive and time-consuming manual checks, which lowers building maintenance costs.
A record of every event

Each snowfall and rainstorm stays in the Smart Roofs Platform as a deflection history you can review.

Alerts reach your team on their phones and in their inbox. History and reports for each building stay on the Smart Roofs Platform.

SMS
Email
App notification

Technical highlights

Uptime

99.99%

Most failures are resolved remotely, with no action needed on your side.
Minimum service life of the laser sensors

10 years
Manufacturer's warranty

24 months
To install 10 sensors

2–3 days

On a 107,600 sq ft (10,000 m²) building. A few hours to a few days, depending on the building.

S-One

Measurement: Laser distance with inclinometer correction
Laser range: Up to 98 ft (30 m), for spans up to 197 ft (60 m)
Accuracy: ±0.04 in (±1 mm)
Measurement interval: Every 3 minutes
Inclinometer: ±15° range, 0.009° accuracy
Laser: Class 2, 635 nm, less than 1 mW
Installation: Indoors, at a structural support of the roof
Operating temperature: 14 °F to 113 °F (−10 °C to +45 °C)
Power: 9–30 VDC from the S-One gateway, 0.6 W max
Wireless: 2.4 GHz ISM band, self-healing mesh, range up to 295 ft (90 m)
Housing: Stainless steel, IP44, 5.7 × 2.6 × 3.5 in (144 × 66 × 90 mm) without antenna
Weight: 2.0 lb (0.9 kg)
Target board: 3.9 in or 5.9 in (100 or 150 mm) high