Stating Dimensions for Crown Moulding

      Crown molding sizes can be looked at two ways: The thickness and width of the board, or the vertical and horizontal distances it will span when installed. Depending on the situation, either could be important. December 2, 2006

I've been working with wood for 30 years and I've pretty much been self-taught. One of the drawbacks of that is that you don't get to draw on other's knowledge very often. Here's my question: how is crown moulding sized? I have heard one size called: 2 5/8, 2 3/4 and 3". Is it measured point to point or is it measured from ceiling to bottom of moulding as it is installed?

Forum Responses
(Cabinet and Millwork Installation Forum)
From contributor J:
Point to point.

From contributor W:
Height and projection.

From the original questioner:
Okay, who's right?

From contributor B:
When you have one size given (example 4 5/8), it is always measured point to point.

From contributor E:
The place I buy molding from is a pretty good sized operation and they give two measurements. Thickness and point to point.

From contributor R:
All posters are correct in their answers. Point to point is used more often when ordering, manufacturing, or selling. Height and projection are more commonly used by drafting, architects, and design people. The height and projection set the width. The width and back bevels set the height and projection. It depends on which is more important to you and your project. Good question - in this case, everybody is correct.

From contributor F:
That is a good question. As an end user of spring moldings, I can say that what matters most to me is the dimensions of the molding in both height and projection. I need to know those two dimensions in order to design my work. For instance, when the crown molding on one cabinet terminates into the side of another cabinet, I need to know the projection of the crown so that the side of the cabinet is deep enough for the crown to terminate, plus a reveal margin. One thing that would be of interest to us all is the correct order of the three dimensions when all three are given. Is it projection x height x point to point?

From contributor R:
In most catalogs you will only see thickness and width (point to point 3/4" x 4 1/2", etc.). However, for master craftsmen, the height and projection I think is more important for reasons you mention. That's why I list both (at - it just depends which dimensions are more important to you. I don't believe there is any correct order in which to list them other than thickness X width.

From contributor B:
Letís look at it another way. Solid crown is sold by its thickness (ceiling projection) and width (wall projection). The size of the board determines the price. A sprung crown is also sold by its thickness (which is not the ceiling projection) and its width (point to point, which is not the wall projection). Again, the thickness and the width of the board determine the price. This is what is important to the manufacturer. It is important for the installer to pick a ceiling projection (I say pick, since you can alter it a little to adjust for reveals, etc.), since knowing the ceiling projection is the only way to check your miter cut depth before you cope. The miter cut depth on your piece to cope, has to equal your ceiling projection. You can use a framing square to check it.

From the original questioner:
Thanks for your responses. They were very helpful. I am buying a small moulding machine soon and this info will be very useful.

Would you like to add information to this article?
Interested in writing or submitting an article?
Have a question about this article?

Have you reviewed the related Knowledge Base areas below?
  • KnowledgeBase: Knowledge Base

  • KnowledgeBase: Architectural Millwork

  • KnowledgeBase: Architectural Millwork: Millwork Installer

  • KnowledgeBase: Architectural Millwork: Moldings

    Would you like to add information to this article? ... Click Here

    If you have a question regarding a Knowledge Base article, your best chance at uncovering an answer is to search the entire Knowledge Base for related articles or to post your question at the appropriate WOODWEB Forum. Before posting your message, be sure to
    review our Forum Guidelines.

    Questions entered in the Knowledge Base Article comment form will not generate responses! A list of WOODWEB Forums can be found at WOODWEB's Site Map.

    When you post your question at the Forum, be sure to include references to the Knowledge Base article that inspired your question. The more information you provide with your question, the better your chances are of receiving responses.

    Return to beginning of article.

    Refer a Friend || Read This Important Information || Site Map || Privacy Policy || Site User Agreement

    Letters, questions or comments? E-Mail us and let us know what you think. Be sure to review our Frequently Asked Questions page.

    Contact us to discuss advertising or to report problems with this site.

    To report a problem, send an e-mail to our Webmaster

    Copyright © 1996-2016 - WOODWEB ® Inc.
    All rights reserved. No part of this publication may be reproduced in any manner without permission of the Editor.
    Review WOODWEB's Copyright Policy.

    The editors, writers, and staff at WOODWEB try to promote safe practices. What is safe for one woodworker under certain conditions may not be safe for others in different circumstances. Readers should undertake the use of materials and methods discussed at WOODWEB after considerate evaluation, and at their own risk.

    WOODWEB, Inc.
    335 Bedell Road
    Montrose, PA 18801

    Contact WOODWEB

  • WOODWEB - the leading resource for professional woodworkers

      Home » Knowledge Base » Knowledge Base Article