How To Apply Crown Molding On Inside Window Trim?

To install crown molding, measure the wall where the bottom of the molding will sit and cut it upside down with the ceiling side on the bottom and the wall side on the top. Nail in place and use caulk to create a finished look for your room. This step-by-step guide will help beginners and intermediate carpenters make the process easier.

Crown molding adds dimension to the top of the window, lacking in flat stock. It is made up of frieze board and cap, a feature found in classical houses. In this article, the basic steps for installing a wide trim around a door and window, complete with mitered corners, are shown. Additionally, a built-up baseboard made from a built-up baseboard is also discussed.

To install custom DIY window trim using basic lumber on a budget, follow these steps:

  1. Make the window sill.
  2. Add window trim sides.
  3. Assemble the header.
  4. Add the apron.
  5. Set nails, wood fill, sand, and caulk.
  6. Prime and paint.

Window moldings are an easy way to add character to your room and fill up the space. To install crown molding, cut a miter on one end of the front crown molding, line up the cut with one end of the head casing, and mark the opposite end for cutting.


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How To Apply Crown Molding On Inside Window Trim
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Rafaela Priori Gutler

Hi, I’m Rafaela Priori Gutler, a passionate interior designer and DIY enthusiast. I love transforming spaces into beautiful, functional havens through creative decor and practical advice. Whether it’s a small DIY project or a full home makeover, I’m here to share my tips, tricks, and inspiration to help you design the space of your dreams. Let’s make your home as unique as you are!

Email: [email protected], [email protected]

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7 comments

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  • @maddawgzzzz: You may be a pro window installer but in no way does that qualify you to be either a professional finish carpenter or an effective educator. Perhaps you’d care to explain why a self-proclaimed professional window installer is perusal YouTube articles designed to assist in the efforts of beginners? One would think a “professional” such as yourself to be much too busy working in your own craft to spend time reviewing skills you clearly believe you’ve mastered. Generally speaking, and I feel most would agree, self-confidence is considered to be a virtue. Being obnoxiously critical of individuals who make time to share their trade however, is unnecessarily rude. Mean words are never productive. I’m a 72 year old widow who thanks to Josh, and a few other educators like him, is quite proud of the knowledge and skills I’ve successfully put into practice after the passing of my husband 5 years ago. You, @maddawgzzzz, exhibit an unusually inflated opinion of your skills & abilities. Perhaps you’d like to justify them by making articles of your work in progress and posting them on YouTube in a positive manner rather than making nasty comments regarding others? For the rest of you crybabies: If you’re unable to keep up the pace with any YouTube article go to settings and adjust the playback speed. I also have a problem with the speed of some programs typically because they’re too slow. This one’s ideal for me.

  • Here’s a tip – rather than tacking it all down, tack it once and leave it a bit loose. Then, when you’re installing the second board you will have wiggle room to adjust it, rather than having to adjust your saw and make additional cuts. Once both boards fit, tack the first one fully and move on to the next board leaving the second one a bit loose, and so forth.

  • This is the correct way. But I would nail the top and side pieces on the jamb. Then Nail the top corners to the wall so they stay nice and flush. The bottom piece is easy. You could just cut it to the same length as the top one, but in this case just make sure the jambs are pointing 90° put the trim upside down against the 45° corners of the side trim and mark the trim Yu need to cut. Go to the miter saw and cut the pieces 45° inwards and you are done. The piece should now fit snug and flush against the side pieces. And because the side trim is not nailed to the wall you do have a few degrees of play on either side to press it against the miters. If you end up with a tiny gap, just fill it with paint and wipe with paper. To hide it, fill the nailheads while you’re at it. 😊

  • Watched this article just a handful of times and slowly but surely, I was able to put together a beautiful window in several hours. The initial cuts are relatively simple, and if you take your time and ensure that the final cut is perfect, you’ll have yourself a glorious lil’ window when you’re done! I’m sure the next one won’t take as long, I’m just meticulous.

  • Awesome article. I had never really done this before and my miters came out perfect. My house is old and the framing surrounding the window iwas not perfectly square. That is why the 45 degree comment below may not be relevant for every scenario. Mine were definitley not all 45 degrees and if you forced them to that the reveals would look off.

  • I used to nail the side verticle pieces in the middle only. The I slip the top or bottom horizontal piece under the sides and use a box knife to mark the angles. I then deepen the cut and score a second knife cut 45°. This makes a website in the wood to place your saw blade. This gives perfect fit and exact spot to start your saw cut first shot. I used a knife for marking and do fitting, rarely use a tape. Retired now after 40+ years

  • I don’t know where you learned anything. All miters should be 45 degrees. You put up you top piece of trim and had no idea if it was level. Level is level, plumb is plumb and square is square. Once you made your top piece you should have made and exact sized bottom piece same with the sides one you know their length. Then it is a matter of making a rectangle with square sides. I need to shut up but seriously you are giving bad advise.

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