How to fit trims to arched windows

An arched window presents some great opportunities for decorating and enhancing a room. A simple alteration like adding trims can work wonders to bring out the curves and highlight the elegant architecture of your arch windows.


While there are many methods used to apply trims to arched windows, one of the easiest involves the use of polyurethane materials. Not only do polyurethane trims add an air of depth and texture to your arched windows, they are also flexible and easily manipulated making installation a breeze. What’s more, polyurethane trims are perfect for fitting around unusual arch window shapes and sizes.


Here is how you do it:

First and foremost, select the type of trim you want to fit. Choosing the trim will largely depend on the existing decor of the room and the type of window you want to trim.
Being the measurements. Start by measuring the bottom of the window inside the arch. This is easily done by placing your measure on the left side of the window just before the start of the curve and stretching it horizontally until it reaches the same area on the right side.trims to arched windows
Now you have to measure the tallest part of the arch. This is simple once you realize that all arch windows are symmetrical, and that the center region will always be the tallest section. Begin measuring from the bottom center of the window to the top of the arch, essentially the arch’s radius.
Now that you have all the required measurements, take it down to your local hardware or home design store. They will have a number of trims to choose from; try to pick one that matches your measurements perfectly. If you can’t find a trim in your size, buy a polyurethane trim and cut it or bend it to fit your size.
Start working on the polyurethane trim with a heat gun. Ideal for smaller pieces of trim, the heat from the gun will enable you to bend the polyurethane to the exact shape you need for your arched window. Be sure to hold the heat gun about a foot away from the trim while heating to prevent any damage to the polyurethane. Once warm the trim can be bent to the exact dimensions of your arch. After heating, allow the trim to cool and harden into its new shape, after which you must sand and paint the trim before installing it.
A particularly thick trim can be cut lengthwise with a hand saw or miter saw. If you buy a four inch thick trim, cut is laterally to end up with two strips of trim each two inches thick. Always try to cut along a seam or elevation in a polyurethane trim, since thick trims will be stuck together in levels. The center of a thick polyurethane trim will be thing and feature elevated borders for easy separation. Use these borders as a guide when cutting.
Now that you have separated the polyurethane trim, the next step is to cut it into several sections. Start by making vertical cuts along the trim with a miter saw or hand saw. Connect the cut pieces together by caulking, making the cuts themselves flexible. As you make your cuts, lay out the individual pieces on the ground and methodically connect each cut piece to the next with caulk. This is the method you will use to create the arch. Deeper arches will require more cuts. While this method is fine for thin trims, additional steps have to be taken when dealing with pieces of long thick polyurethane trim.

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