Understanding the Importance of Structural Grids in Construction Drawings

Understanding the Importance of Structural Grids and Detailed References in Construction Plans

Dive into the intricacies of a cementation plan and discover the importance of structural grids. This article explores how they play a key role in communications between structural engineers and regulatory agencies.

Key Insights:

  • Structural grids are essential in construction documents, commonly used to indicate specific areas in calculations for regulatory agencies. They are used universally in commercial construction and increasingly in residential construction.
  • Grid systems in plans not only facilitate easy referencing and localization of problem areas, but they also serve as a communication tool between on-site workers and office personnel.
  • Dimensions in cementation plans are anchored to the grids to further improve clarity and facilitate understanding. The dimensions serve to provide more detailed information about specific elements, like chimneys, in the plan.

This is our cementation plan. The cementation plan speaks of the concrete that is being built here. When you look at this drawing, you will see numbers in the grid.

We are showing the grid numbers from 1 to 8 at the top, and from A to H along the side. When the structural engineer sends his calculations to the regulatory agency. They are having to indicate throughout certain areas.

They have to indicate in certain areas because they have calculated structurally. So, for example, this wall segment would be the wall along grid 2 between grids A and C. So they would refer to that information in their calculations. In residential construction, it is increasingly common to see structural grids along a set of drawings.

In commercial construction, you always see structural grids indicated in a set of construction documents. One of the real advantages of having grid systems in the plans is if, for example, I am having a problem. In this area of the drawing, I can be in the workplace, talking to someone in their office.

And they can say, where is your problem? And I can say that it is between grids 3 and 4 and grids C and D. And then they can easily get to that point. Now, another thing that happens in this drawing is that if you look there, you can see that the floor plan is hidden. We have the floor plan in the structural drawing.

Learn Blueprint Reading

  • Nationally accredited
  • Create your own portfolio
  • Free student software
  • Learn at your convenience
  • Authorized Autodesk training center

Learn More

But it is protected, which means that it is a pose shadow. So again, it will facilitate conversations when you are talking to different people. So structural grids are very important.

You can see in this area that I have my detailed references. So detail 9 will show this condition at the base. So, detail 9 will be shown on sheet S1.3. And the first time we see that detail is on this page.

It was sheet 1.3. You can see the symbols right here for my different cutting walls. I have a description that talks about the state of the concrete floor. And again here I am showing a section.

Through that wall there is a detailed section. Again it would be detail 1 on sheet S4.1. And the first pages of this sheet as 2.1. We have foundational notes. You will also see this in the foundation notes themselves.

They are referring to other details to get more information. So, instead of mentioning all the information in the note, they are saying, go and look at this detail to see more about what is happening on this page. So this is our base plan.

If you could please take a little time to look at the drawing. You will also notice from the point of view of dimensioning. That we have dimensions and we are dimensioning the grid.

And as necessary we are anchoring for example the dimensions. For this chimney they are anchoring again to this grid here. So let's enlarge the image.

Observe that for a second. This again facilitates the visualization and communication of information. Between the structural engineer and the regulatory agency.

Again we have the structural grids and the dimensions are anchored again to the grids. And again we are finding structural grids. It is used all the time in commercial construction.

And it is used more and more in residential construction.

Al Whitley

AutoCAD and Blueprint Reading Instructor

Al was the Founder and CEO of VDCI | cadteacher for over 20 years. Al passed away in August of 2020. Al’s vision was for the advancement and employment of aspiring young professionals in the Architecture, Engineering and Construction (AEC) industries.

More articles by Al Whitley

How to Learn Blueprint Reading

Gain the ability to interpret and create technical blueprints for construction and engineering projects with comprehensive training.

Yelp Facebook LinkedIn YouTube Twitter Instagram