--- title: "Base Extractors Description" description: "What are Base Extractors in Kreo BIM Takeoff" url: https://help-takeoff.kreo.net/en/articles/5723092-base-extractors-description collection: "Measurement Details" updated: 2026-10-26 language: en alternates: [fr] --- # Base Extractors Description What are Base Extractors in Kreo BIM Takeoff Before we start: 📝**Note!** Base Extractors calculate the geometric characteristics of an object. The layers of a single element (e.g. walls, floors) do not have a separate geometry. They are simply part of the Assembly geometry. Thus Base Extractors will not calculate the value of a single layer. They will calculate the value of the Assembly. This should be taken into account, determining the layer's thickness and the volume. **The list of the Base Extractors:** - Object.SurfaceArea — full surface area of the element. ![object-surface-area](https://staticfiles.gleap.io/helpcenter/6874f791a81bb9196b315e05/20250715091051_8672.png) - Object.HorizontalSurfaceArea — analyses the surface of the element and calculates the area of its horizontal parts. ![object-horizontal-surface-area](https://staticfiles.gleap.io/helpcenter/6874f791a81bb9196b315e05/20250715091051_0952.png) - Object.VerticalSurfaceArea — analyses the surface of the element and calculates the area of its vertical parts. ![object-vertical-surface-area](https://staticfiles.gleap.io/helpcenter/6874f791a81bb9196b315e05/20250715091051_8392.png) - Object.Volume — calculates the volume of the element's geometry. ![object-volume](https://staticfiles.gleap.io/helpcenter/6874f791a81bb9196b315e05/20250715091051_0835.png) - VerticalBB.Height — calculates the difference between the coordinates of the highest and lowest points of the element. ![vertical-bb-height](https://staticfiles.gleap.io/helpcenter/6874f791a81bb9196b315e05/20250715091051_1554.png) - VerticalBB.SectionMaxDimension — maximum horizontal cross section dimension of the object in its final position. ![vertical-bb-section-max-dimension](https://staticfiles.gleap.io/helpcenter/6874f791a81bb9196b315e05/20250715091051_8404.png) - VerticalBB.SectionMinDimension — minimum horizontal cross section dimension of the object in its final position. ![vertical-bb-section-min-dimension](https://staticfiles.gleap.io/helpcenter/6874f791a81bb9196b315e05/20250715091051_7563.png) - VerticalBB.SideSurfaceArea — side surface area of the object in its final position. ![vertical-bb-side-surface-area](https://staticfiles.gleap.io/helpcenter/6874f791a81bb9196b315e05/20250715091051_7753.png) - VerticalBB.TopSurfaceArea — top surface area of the object in its final position. ![vertical-bb-top-surface-area](https://staticfiles.gleap.io/helpcenter/6874f791a81bb9196b315e05/20250715091050_7417.png) - VerticalBB.BottomSurfaceArea — bottom surface area of the object in its final position. ![vertical-bb-bottom-surface-area](https://staticfiles.gleap.io/helpcenter/6874f791a81bb9196b315e05/20250715091051_9200.png) - VerticalBB.SectionArea — horizontal cross section area of the object in its final position. ![vertical-bb-section-area](https://staticfiles.gleap.io/helpcenter/6874f791a81bb9196b315e05/20250715091051_3259.png) - VerticalBB.Slope — the angle (radian) between the horizontal surface and the top surface of the object in its final position. ![vertical-bb-slope](https://staticfiles.gleap.io/helpcenter/6874f791a81bb9196b315e05/20250715091051_6504.png) - ObjectBB.Length — clearance length of the object. ![object-bb-length](https://staticfiles.gleap.io/helpcenter/6874f791a81bb9196b315e05/20250715091051_1808.png) - ObjectBB.SectionMaxDimension — clearance width (maximum size) of the object in a specific section. ![object-bb-section-max-dimension](https://staticfiles.gleap.io/helpcenter/6874f791a81bb9196b315e05/20250715091051_8387.png) - ObjectBB.SectionMinDimension — clearance depth (minimum size) of the object in a specific section. ![object-bb-section-min-dimension](https://staticfiles.gleap.io/helpcenter/6874f791a81bb9196b315e05/20250715091051_8223.png) - ObjectBB.SideSurfaceArea — the area of the object excluding the area of its faces which are superimposed with the start and the end faces of the bounding box. ![object-bb-side-surface-area](https://staticfiles.gleap.io/helpcenter/6874f791a81bb9196b315e05/20250715091051_2790.png) - ObjectBB.TopSurfaceArea — top area of the object, area of its face which is superimposed with the start face of the bounding box. ![object-bb-top-surface-area](https://staticfiles.gleap.io/helpcenter/6874f791a81bb9196b315e05/20250715091051_8030.png) - ObjectBB.BottomSurfaceArea — bottom area of the object, area of its face which is superimposed with the end face of the bounding box. ![object-bb-bottom-surface-area](https://staticfiles.gleap.io/helpcenter/6874f791a81bb9196b315e05/20250715091051_9292.png) - ObjectBB.SectionArea — the area of the minimal section of the bounding box. ![object-bb-section-area](https://staticfiles.gleap.io/helpcenter/6874f791a81bb9196b315e05/20250715091051_2674.png) - SelfDimension.Length — the length of the largest axis of the element. ![self-dimension-length](https://staticfiles.gleap.io/helpcenter/6874f791a81bb9196b315e05/20250715091051_5476.png) - SelfDimension.SectionVerticalDimension — the dimension of the section's most vertical edge obtained if you cut the extrusion object perpendicular to the direction of its extrusion (the extrusion axis is the largest element axis). ![self-dimension-section-vertical-dimension](https://staticfiles.gleap.io/helpcenter/6874f791a81bb9196b315e05/20250715091051_3852.png) - SelfDimension.SectionHorizontalDimension — the dimension of the section's most horizontal edge obtained if you cut the extrusion object perpendicular to the direction of its extrusion (the extrusion axis is the largest element axis). ![self-dimension-section-horizontal-dimension](https://staticfiles.gleap.io/helpcenter/6874f791a81bb9196b315e05/20250715091051_3911.png) - SelfDimension.SectionMaxDimension — maximum cross section dimension of the extrusion object (the extrusion axis is the largest element axis). ![self-dimension-section-max-dimension](https://staticfiles.gleap.io/helpcenter/6874f791a81bb9196b315e05/20250715091051_1240.png) - SelfDimension.SectionMinDimension — minimum cross section dimension of the extrusion object (the extrusion axis is the largest element axis). ![self-dimension-section-min-dimension](https://staticfiles.gleap.io/helpcenter/6874f791a81bb9196b315e05/20250715091051_8898.png) - SelfDimension.Thickness — the smallest of the three dimensions of the element, the length and width of which is much greater rather than the thickness. ![self-dimension-thickness](https://staticfiles.gleap.io/helpcenter/6874f791a81bb9196b315e05/20250715091051_9564.png) - SelfDimension.HorizontalRadius — curvature radius of the extrusion path of the object (the extrusion axis is the largest element axis). ![self-dimension-horizontal-radius](https://staticfiles.gleap.io/helpcenter/6874f791a81bb9196b315e05/20250715091051_8200.png) - SelfDimension.WideArea — the area of the largest continuous part of the element's surface. For walls it’s wall area from one side, for floors it’s bottom area subtracting all the openings. ![self-dimension-wide-area](https://staticfiles.gleap.io/helpcenter/6874f791a81bb9196b315e05/20250715091051_3983.png) - SelfDimension.SectionArea — cross section area of the extrusion object (the extrusion axis is the largest element axis). ![self-dimension-section-area](https://staticfiles.gleap.io/helpcenter/6874f791a81bb9196b315e05/20250715091051_4599.png) - SelfDimension.TopSurfaceArea — top surface area of the extrusion object (the extrusion axis is the largest element axis). ![self-dimension-top-surface-area](https://staticfiles.gleap.io/helpcenter/6874f791a81bb9196b315e05/20250715091052_9328.png) - SelfDimension.BottomSurfaceArea — bottom surface area of the extrusion object (the extrusion axis is the largest element axis). ![self-dimension-bottom-surface-area](https://staticfiles.gleap.io/helpcenter/6874f791a81bb9196b315e05/20250715091051_9323.png) - SelfDimension.SideSurfaceArea — side surface area of the extrusion object (the extrusion axis is the largest element axis). ![self-dimension-side-surface-area](https://staticfiles.gleap.io/helpcenter/6874f791a81bb9196b315e05/20250715091051_0212.png) - Formwork.Horizontal — total formwork area for the horizontal surfaces with a slope of up to 5 degrees. ![formwork-horizontal](https://staticfiles.gleap.io/helpcenter/6874f791a81bb9196b315e05/20250715091051_6657.png) ![formwork-horizontal-1](https://staticfiles.gleap.io/helpcenter/6874f791a81bb9196b315e05/20250715091051_5272.png) - Formwork.HorizontalWithOpenings — the same as “Formwork.Horizontal” adding void areas. ![formwork-horizontal-with-openings](https://staticfiles.gleap.io/helpcenter/6874f791a81bb9196b315e05/20250715091051_2229.png) ![formwork-horizontal-with-openings-1](https://staticfiles.gleap.io/helpcenter/6874f791a81bb9196b315e05/20250715091051_5219.png) - Formwork.Vertical — total formwork area for the vertical surfaces with a slope of up to 5 degrees. ![formwork-vertical](https://staticfiles.gleap.io/helpcenter/6874f791a81bb9196b315e05/20250715091051_5278.png) ![formwork-vertical-1](https://staticfiles.gleap.io/helpcenter/6874f791a81bb9196b315e05/20250715091051_3919.png) - Formwork.VerticalWithOpenings — the same as “Formwork.Vertical” adding void areas. ![formwork-vertical-with-openings](https://staticfiles.gleap.io/helpcenter/6874f791a81bb9196b315e05/20250715091051_2416.png) ![formwork-vertical-with-openings-1](https://staticfiles.gleap.io/helpcenter/6874f791a81bb9196b315e05/20250715091051_0498.png) - Formwork.SlantedLess15 — total formwork area for the horizontal surfaces with a slope from 5 to 15 degrees. ![formwork-slantedless15](https://staticfiles.gleap.io/helpcenter/6874f791a81bb9196b315e05/20250715091051_5767.png) - Formwork.SlantedMore15 — total formwork area for the horizontal surfaces with a slope from 15 to 60 degrees. ![formwork-slantedmore15](https://staticfiles.gleap.io/helpcenter/6874f791a81bb9196b315e05/20250715091051_0900.png) - Formwork.SlantedLess15WithOpenings — The same as “Formwork.SlantedLess15” adding hole areas. ![Formwork.SlantedLess15WithOpenings](https://staticfiles.gleap.io/helpcenter/6874f791a81bb9196b315e05/20250715091051_0701.png) - Formwork.SlantedMore15WithOpenings — The same as “Formwork.SlantedMore15” adding hole areas. ![Formwork.SlantedMore15WithOpenings](https://staticfiles.gleap.io/helpcenter/6874f791a81bb9196b315e05/20250715091051_2983.png) - Formwork.SlopedPerimeter — the perimeter of the horizontal section of the wall or the floor, excluding the perimeter of inner voids (applicable for slanted objects too). ![formwork-sloped-perimeter](https://staticfiles.gleap.io/helpcenter/6874f791a81bb9196b315e05/20250715091051_8167.png) - Formwork. SlopedPerimeterWithOpenings — the perimeter of the horizontal section of the wall or the floor, including the perimeter of inner voids (applicable for slanted objects too). ![formwork-sloped-perimeter-with-openings](https://staticfiles.gleap.io/helpcenter/6874f791a81bb9196b315e05/20250715091051_9943.png) ## Related - [Measurement Description](https://help-takeoff.kreo.net/en/articles/5723124-measurement-description.md)