FHB Logo Facebook LinkedIn Email Pinterest Twitter X Instagram Tiktok YouTube Plus Icon Close Icon Navigation Search Icon Navigation Search Icon Arrow Down Icon Video Guide Icon Article Guide Icon Modal Close Icon Guide Search Icon Skip to content
Subscribe
Log In
  • How-To
  • Design
  • Tools & Materials
  • Restoration
  • Videos
  • Blogs
  • Forum
  • Magazine
  • Members
  • FHB House
  • Podcast
Log In

Discussion Forum

Discussion Forum

Trapezoid and Triangle Interior Window T

| Posted in General Discussion on April 21, 2003 06:11am

Hi-

I’m trimming out my trapezoid windows and would like some feedback on the best method of matching the corners of the trim (I am referring to the trim that nails up against the sheetrock of the wall). As far as I can see, the only way to make things look right and get the angles and trim width to match all the way arond is to do the trim on the lower portion of the window just like a square or rectangular window using 45-degree angles on the corners and then place the top piece directly on top if the vertical trim pieces (stiles?)

On the triangle windows, it looks like I need to build the 90 degree portion of the window trim first and then place the sloping portion of the trim on afterward. Problem is this will force me to use a rectangular piece of trim on the bottom of the triangle since if I try to finish out the corner of the trim to a point that follows the same shape as the window it will extend the trim length past that of the rectangular window below causing a misalignment of the window trim boards on the wall.

Any suggestions would be greatly appreciated. Thanks!

SB

P.S.- I can attach some photos if you need clarification of what I’m working with.

Reply
  • X
  • facebook
  • linkedin
  • pinterest
  • email
  • add to favorites Log in or Sign up to save your favorite articles

Replies

  1. CAGIV | Apr 21, 2003 11:10pm | #1

    Pictures would be of a great help.

    View ImageGo Jayhawks..............Next Year and daaa. Blues View Image
    1. cliffhanger | Apr 22, 2003 12:39am | #2

      Hi CAG-

      I have attached two pictures (one trapezoid and one triangle).  I hope this helps explain what I'm trying to do.  Thanks in advance!

      -=Cliffhanger

    2. cliffhanger | Apr 22, 2003 12:44am | #3

      Hi CAG-

      It appears that the picture files would not attach using Internet Explorer. I'm going to try again using Netscape. I hope it works this time.

      -=Cliffhanger

      1. User avater
        GoldenWreckedAngle | Apr 22, 2003 01:48am | #4

        Your trim should match up perfectly if you simple split the difference of each corner angle between the two pieces of trim where they meet at each corner. (see attached)

        Is that what you were after?Kevin Halliburton

        "One machine can do the work of fifty ordinary men. No machine can do the work of one extraordinary man." -Elbert Hubbard-

        1. cliffhanger | Apr 22, 2003 04:27am | #5

          Hi Kevin-

          Thanks for the quick reply.  I can see how the trapezoid trim will work, but the triangle is still a problem.  If you look at the RH corner you'll see that in order to make those two pieces of trim meet using a cut like that the trim will have to extend out from the corner of the window much further than the actual width of the trim board (in my case the trim is 3 1/4 inches wide and using those angle cuts on the RH corner of the window forces the trim out approximately 6 inches from the window itself).  Since I am trying to match the triangle window trim to the trim of a rectangular window directly below it you can see how the two window trims will not line up vertically--the triangle corner trim will extend beyond the rectangular window trim by about 2 3/4 inches.  So, that is the problem I'm trying to figure out.  The only solution I have come up with is to not bring the corner of the triangular window to a point and instead just use a piece of trim on the bottom that has a vertical end cut that matches the trim on the window below it.  Does that make sense?  I can try to draw it if that would help.  Thanks again!

          -=Cliffhanger

          1. clampman2 | Apr 22, 2003 05:06am | #6

            Cliffhanger,

            There are several options, which you have probably thought about.

            1) Make the miter in the lower right corner and clip the end vertical to align with the lower unit.

            2)Use smaller trim on the upper since it appears that a carrying timber to the left of the triangle will require scribing anyhow.

            3) Cheat the reveal of the lower unit as wide as you can, and make that casing slightly wider than the rest. Then, drop the top piece of casing on the triangle below the jamb by an inch or so. It will not be very noticeable at all and you will only lose a small portion of the view of the outside soffit.

            4) (What I would do), is to hold a piece of trim in position on the lower unit and project it up to the upper triangle and draw a line along its outside edge so you can see exactly what's going on. Then I would hold up a small piece of trim on this line vertically and tack it in place. If the inside edge of this piece reaches the jamb or goes beyond it, good. Then I would lay the top piece of trim over it, bisect the angles for the miter, lay the bottom piece over it and bisect that angle, and make a trap out of the triangle. The outside edge of the small (transition) piece will align with the lower unit and be vertical as well.

            Good luck,

            Clampman

            Edited 4/21/2003 10:41:10 PM ET by clampman

          2. cliffhanger | Apr 22, 2003 06:22am | #8

            Clampman-

            I'll give your tricks a whirl.  Thank you for the help.  I really appreciate it!

            -=Cliffhanger

          3. User avater
            SamT | Apr 22, 2003 05:53am | #7

            If you can stand to look at my bad drawing hre's another.

            After marking both (scrap) pieces cut from mark to mark.. "leave the marks" when you cut.  use the scraps to layout the trim.

            SamT

          4. cliffhanger | Apr 22, 2003 06:25am | #9

            Sam-

            Thank you for the help.  I'll give it a try.  Much appreciated!

            -=Cliffhanger

          5. User avater
            GoldenWreckedAngle | Apr 22, 2003 05:56pm | #10

            Ahhhh, now I see your dillema. I knew I was over simplifying it but I couldn't wrap my brain around what you were having trouble with.

            I think this is actually what you are shooting for, no?Kevin Halliburton

            "One machine can do the work of fifty ordinary men. No machine can do the work of one extraordinary man." -Elbert Hubbard-

          6. cliffhanger | Apr 22, 2003 08:37pm | #11

            Kevin-

            That's it!  Thanks a bunch!

            -=Cliffhanger

          7. clampman2 | Apr 23, 2003 04:34am | #13

            Your picture is so much clearer than my description. My thanks too.

            Clampman

          8. User avater
            Qtrmeg | Apr 22, 2003 08:40pm | #12

            It's a job thing, those extentions didn't look like they lined up in the photo, but hard to tell from here.

            Lotsa good ideas,

            Edited 4/22/2003 1:44:53 PM ET by Qtrmeg

Log in or create an account to post a comment.

Sign up Log in

Become a member and get full access to FineHomebuilding.com

Video Shorts

Categories

  • Business
  • Code Questions
  • Construction Techniques
  • Energy, Heating & Insulation
  • General Discussion
  • Help/Work Wanted
  • Photo Gallery
  • Reader Classified
  • Tools for Home Building

Discussion Forum

Recent Posts and Replies

  • |
  • |
  • |
  • |
  • |
  • |
View More Create Post

Up Next

Video Shorts

Featured Story

FHB Podcast Segment: Finding the Right Fixer-Upper

Get expert guidance on finding a fixer-upper that's worth the effort.

Featured Video

A Modern California Home Wrapped in Rockwool Insulation for Energy Efficiency and Fire Resistance

The designer and builder of the 2018 Fine Homebuilding House detail why they chose mineral-wool batts and high-density boards for all of their insulation needs.

Related Stories

  • Guest Suite With a Garden House
  • Podcast Episode 688: Obstructed Ridge Vent, Buying Fixer-Uppers, and Flashing Ledgers
  • FHB Podcast Segment: Finding the Right Fixer-Upper
  • Keeping It Cottage-Sized

Highlights

Fine Homebuilding All Access
Fine Homebuilding Podcast
Tool Tech
Plus, get an extra 20% off with code GIFT20

"I have learned so much thanks to the searchable articles on the FHB website. I can confidently say that I expect to be a life-long subscriber." - M.K.

Get home building tips, offers, and expert advice in your inbox

Signing you up...

This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.
See all newsletters
See all newsletters

Fine Homebuilding Magazine

  • Issue 332 - July 2025
    • Custom Built-ins With Job-Site Tools
    • Fight House Fires Through Design
    • Making the Move to Multifamily
  • Issue 331 - June 2025
    • A More Resilient Roof
    • Tool Test: You Need a Drywall Sander
    • Ducted vs. Ductless Heat Pumps
  • Issue 330 - April/May 2025
    • Deck Details for Durability
    • FAQs on HPWHs
    • 10 Tips for a Long-Lasting Paint Job
  • Issue 329 - Feb/Mar 2025
    • Smart Foundation for a Small Addition
    • A Kominka Comes West
    • Making Small Kitchens Work
  • Issue 328 - Dec/Jan 2024
    • How a Pro Replaces Columns
    • Passive House 3.0
    • Tool Test: Compact Line Lasers

Fine Home Building

Newsletter Sign-up

  • Fine Homebuilding

    Home building tips, offers, and expert advice in your inbox.

  • Green Building Advisor

    Building science and energy efficiency advice, plus special offers, in your inbox.

  • Old House Journal

    Repair, renovation, and restoration tips, plus special offers, in your inbox.

Signing you up...

This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.
See all newsletters

Follow

  • Fine Homebuilding

    Dig into cutting-edge approaches and decades of proven solutions with total access to our experts and tradespeople.

    Start Free Trial Now
    • Facebook
    • Instagram
    • X
    • LinkedIn
  • GBA Prime

    Get instant access to the latest developments in green building, research, and reports from the field.

    Start Free Trial Now
    • Facebook
    • YouTube
  • Old House Journal

    Learn how to restore, repair, update, and decorate your home.

    Subscribe Now
    • Facebook
    • Instagram
    • X
  • Fine Homebuilding

    Dig into cutting-edge approaches and decades of proven solutions with total access to our experts and tradespeople.

    Start Free Trial Now
    • Facebook
    • Instagram
    • X
    • LinkedIn
  • GBA Prime

    Get instant access to the latest developments in green building, research, and reports from the field.

    Start Free Trial Now
    • Facebook
    • YouTube
  • Old House Journal

    Learn how to restore, repair, update, and decorate your home.

    Subscribe Now
    • Facebook
    • Instagram
    • X

Membership & Magazine

  • Online Archive
  • Start Free Trial
  • Magazine Subscription
  • Magazine Renewal
  • Gift a Subscription
  • Customer Support
  • Privacy Preferences
  • About
  • Contact
  • Advertise
  • Careers
  • Terms of Use
  • Site Map
  • Do not sell or share my information
  • Privacy Policy
  • Accessibility
  • California Privacy Rights

© 2025 Active Interest Media. All rights reserved.

Fine Homebuilding receives a commission for items purchased through links on this site, including Amazon Associates and other affiliate advertising programs.

  • Home Group
  • Antique Trader
  • Arts & Crafts Homes
  • Bank Note Reporter
  • Cabin Life
  • Cuisine at Home
  • Fine Gardening
  • Fine Woodworking
  • Green Building Advisor
  • Garden Gate
  • Horticulture
  • Keep Craft Alive
  • Log Home Living
  • Military Trader/Vehicles
  • Numismatic News
  • Numismaster
  • Old Cars Weekly
  • Old House Journal
  • Period Homes
  • Popular Woodworking
  • Script
  • ShopNotes
  • Sports Collectors Digest
  • Threads
  • Timber Home Living
  • Traditional Building
  • Woodsmith
  • World Coin News
  • Writer's Digest
Active Interest Media logo
X
X
This is a dialog window which overlays the main content of the page. The modal window is a 'site map' of the most critical areas of the site. Pressing the Escape (ESC) button will close the modal and bring you back to where you were on the page.

Main Menu

  • How-To
  • Design
  • Tools & Materials
  • Video
  • Blogs
  • Forum
  • Project Guides
  • Reader Projects
  • Magazine
  • Members
  • FHB House

Podcasts

  • FHB Podcast
  • ProTalk

Webinars

  • Upcoming and On-Demand

Podcasts

  • FHB Podcast
  • ProTalk

Webinars

  • Upcoming and On-Demand

Popular Topics

  • Kitchens
  • Business
  • Bedrooms
  • Roofs
  • Architecture and Design
  • Green Building
  • Decks
  • Framing
  • Safety
  • Remodeling
  • Bathrooms
  • Windows
  • Tilework
  • Ceilings
  • HVAC

Magazine

  • Current Issue
  • Past Issues
  • Magazine Index
  • Subscribe
  • Online Archive
  • Author Guidelines

All Access

  • Member Home
  • Start Free Trial
  • Gift Membership

Online Learning

  • Courses
  • Project Guides
  • Reader Projects
  • Podcast

More

  • FHB Ambassadors
  • FHB House
  • Customer Support

Account

  • Log In
  • Join

Newsletter

Get home building tips, offers, and expert advice in your inbox

Signing you up...

This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.
See all newsletters
See all newsletters

Follow

  • X
  • YouTube
  • instagram
  • facebook
  • pinterest
  • Tiktok

Join All Access

Become a member and get instant access to thousands of videos, how-tos, tool reviews, and design features.

Start Your Free Trial

Subscribe

FHB Magazine

Start your subscription today and save up to 70%

Subscribe

Enjoy unlimited access to Fine Homebuilding. Join Now

Already a member? Log in

We hope you’ve enjoyed your free articles. To keep reading, become a member today.

Get complete site access to expert advice, how-to videos, Code Check, and more, plus the print magazine.

Start your FREE trial

Already a member? Log in

Privacy Policy Update

We use cookies, pixels, script and other tracking technologies to analyze and improve our service, to improve and personalize content, and for advertising to you. We also share information about your use of our site with third-party social media, advertising and analytics partners. You can view our Privacy Policy here and our Terms of Use here.

Cookies

Analytics

These cookies help us track site metrics to improve our sites and provide a better user experience.

Advertising/Social Media

These cookies are used to serve advertisements aligned with your interests.

Essential

These cookies are required to provide basic functions like page navigation and access to secure areas of the website.

Delete My Data

Delete all cookies and associated data