autodesk quantity takeoff 2013 tutorial pdf

Because information in a BIM model is in general more complete and consistent than that in a corresponding set of 2D drawings, BIM-based quantity take-off should be more accurate than 2D quantity take-off. Also, we need to be careful not to double count some quantity appearing in more than one 2D drawing. With this traditional 2D quantity take-off approach, we need to make sure we have a set of 2D drawings that contain complete information for quantity take-off. As shown in the figure, there are 9 windows on this drawing. If we would like to know the number of windows, we just need to mark on the positions roughly where the windows are located on the drawing and the software would count the number automatically for us. Different colors are used to label regions for separate area quantity take-offs. As long as you can lay out a 2D drawing with correct scale and units, the software can help you to lay rectangles on top of the regions we would like to have their area values. Let us use screen snapshots of some video clips available on the Internet as examples to demonstrate how quantity information can be extracted from the 2D drawings with the help of a computer software. The second type is about dimension information of the building components, spaces, and shapes, for example, the sizes of a door, the area of a floor, the volume of a column, etc.

The first one is information about number of building components or elements, such as doors, windows, columns, beams, etc. There are two major types of quantity information we need. Traditionally quantity information is extracted from 2D CAD drawings.

Then, we will discuss BIM-based quantity take-off methods.

In this module, I will introduce the importance of quantity take-off for construction and how quantity take-off is carried out traditionally based on 2D drawings. Quantity information is an important and essential part of the cost estimate for a construction project.

Autodesk quantity takeoff 2013 tutorial pdf