Time to take

6 hours time redution figure

From when the manager went to site to take the point cloud until available results

Costs saved

Cost saving figure

Estimated cost savings of rework to correct every stair of the project in case all were deviated. $730 per element

Increase in

85% productivity increase graph

Estimated productivity upgrade after subtract spent hours on the same inspection with traditional methods

About the project

Location: Madrid, Spain.
Industry: Office building

Work phase: Above Ground – Structure
Data capture method: iPad Pro (Sitescape)

Size: 232737.27 ft2
Project value: $16.5M

The problem

Casting errors during the structural phase of a project, known as ‘site cast element’ mistakes, can lead to substantial rework expenses. These costs are avoidable through the implementation of advanced technological tools. By conducting meticulous formwork inspections, you can significantly mitigate project risk

Stairs 3D model and point cloud

Operation process & scope

To ensure that the element’s concrete was poured correctly, the site manager inspected the ground floor of the side to:

1. Test the quality of the point cloud that contains the concrete formwork before pour-in-place.
2. Upload models (BIM & POINT CLOUD) to execute the inspection on-site.
3. After having results, vary the displacement of the model from solid to wireframe and activate the heat map on the point cloud to highlight the deviated areas.
4. Share the inspection to the involved stakeholders to determine how to proceed.


At the moment of the operation the element’s concrete wasn’t completely poured. Thus, the system was able to confirm the formwork alignment on the constructed element and the remaining part to pour.

  • The system has made a very good comparison of the stairs in formwork, without having finished pouring all the concrete. Actually, it is evident that the edges of the steps are detected as being part of the formwork and not the model, but the already poured concrete is perfectly flat.
  • Something similar happens around the side corners of the stairs, where we can observe that the biggest difference between the point cloud and model is in the protruding formwork elements, nevertheless the percentage estimated to be inside of tolerance (which we call “Similarity Percentage”) is of around 97%.
Stairs 3D model and point cloud
Stairs 3D model and point cloud


C2B Platform aligned, self-corrected and cleaned the as-built model to automatically provide results 34h faster than the traditional methods. The second section of the stair has a higher inclination than that of the model. Its most distant area would represent an extra cost of 40.28ft3 of concrete. The element has 61% of similarity (points inside our tolerance values) with the projected element in the model.

Stairs 3D model and point cloud
Stairs 3D model and point cloud


Throughout both inspections the ACERTA’s team proved that CHECKTOBUILD’s C2B Platform definitely offers results with the same accuracy level as other traditional “reality capture” techniques with the advantage of reduced time to obtain results and take decisions.
Since in the two inspections of similar elements, the use of formwork was necessary, it was concluded that in the case of the second inspection, when the operation was carried out after the pouring, deviations were incurred in the concrete that could have been corrected in advance. As verified in the first inspection case; where the inspection was carried out on the formwork and only 70% of the concrete had been poured, That, allowed the team to verify the correct alignment of the formwork to the model.

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