There are many reasons to compare two plans, such as receiving an addenda or wanting to place an architectural over a structural plan to view obstructions.  STACK allows you to visually compare the two plans by showing red lines on one plan and blue lines on the other so you can easily see any differences between them.

To get started, open the plan you would like to overlay another plan on.  In this example, I will overlay the revised version of C03.00 with the original version. I start with the original plan open, and click the Overlay button on the right menu. 

This will open a window showing all the plans in the project.  If you created folders for the project, you will see the folders listed under the plan name to help you identify the correct plan to choose. You can also search by the plan name.  Once you find the plan you want, click in the plan name area.  

Initially, you will see a color change on the screen.  A purple color indicates no changes between the two plans.  Blue represents the original plan, and red indicates the overlayed plan.  

In this example, we can see detail (red color) was added to the addenda version.  There is also text in the bottom left with instructions on using overlay.  

Click the layers icon to see the colors associated with each plan.  Click the green 'x' to turn off the overlay.  Click the up icon to close the layer window. 

You also have options to re-size or move the plan if it needs aligned.  

To resize, hold the mouse down on one of the corner drag handles to proportionally resize the plan.  You can also resize horizontally or vertically by holding down the non-corner drag handles.  

To align the pages, hold down the CTRL key (ALT when using Firefox on a Mac) on your keyboard while pressing down with the mouse button to move the overlay. Once the pages are aligned, you will see the color purple to indicate they are directly on top of each other.  You can use text, or a corner of a room to align the pages, for example. 

If you do a takeoff or markup on the overlay, they will be drawn on the plan you started with, before applying the overlay,  In this case, I added a markup to the overlay.

The dimension line then appears on the original plan when you are finished viewing the overlay.

To close the overlay, close the tab.  You can quickly reapply the overlay again by repeating the steps above.  

To add more than one Overlay to the page, click the Add Overlay button within the layer window.

You have the ability to add as many Overlay's as you like.  Hide Overlay's to improve the pan and zoom experience. 

You can also hide the visibility of an Overlay or close an Overlay within the layer window.

Additionally, you can override the Overlay color by clicking on the colored layer icon for any Overlay, except the base layer.  

Share your feedback, or ideas for improving Plan Overlay by clicking the star icon.

Note:  Plan Overlay is not supported using Internet Explorer 11.  We recommend using Chrome or FireFox 

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