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If you have a window without a standard type of sill, then a window casing would be essential. In this case, four pieces of wood are cut using a miter saw so the corners are each mitered. As you will discover in this article, the process of putting up a new window casing is actually very easy, much easier than you might think. Therefore, if you want to create beautiful windows on the inside, you can.
The first step to installing window casing is to remove the old casing. The result is having drywall with exposed areas where the new window casing will go, marking the reveal. For this, use a 3/16 inch and an adjustable try-square. Then, the inside corner of the window casing would be placed on the pencil marks made. Next, the bottom jamb is different. For this, you want to mark the revealed 3/16 inch area since covering this can be a little tricky unless the window casing is positioned just right. Your next step for installing a new window casing is to fill the gaps around the window jambs with insulation, which you can purchase in small quantities. For this, we recommend fiberglass, not the expanding foam type since it is too hard to predict and if it gets on the carpet, it will ruin it. You might then consider writing down the dimensions of the window casing rectangle, adding twice the trim width so you get the outside dimensions right. Just mark the length and then make a 45-degree line with a speed square so you get a clean and precise line with the miter saw for the connecting corners. Next, lay out your four cut pieces for the window casing. Using a nail gun with 1-inch brad nails, shoot them into the corners to secure all of the pieces together. When finished, your window casing will look like a picture frame but without the picture. Once you have all four pieces of the window casing complete, you will put it in place over the window. If the window is large, you may need the help of a friend to get it into place while holding it while being installed. With the window casing in position, you can again use a 1-inch brad, shooting it in the top corner to anchor the frame. Once you have both of the top corners positioned and nailed securely down, continue down the window casing, driving a nail every 6 to 8 inches into the jamb. When shooting the nails into the window casing, just take your time so you space the nails out evenly and the completed job looks nice. You may notice the top piece of the casing trying to arch. For this, use another nail on the bottom mid-section to hold it in place. When done, you can go back over the nail holes, filling them with wood filler. That way, when the window casing is painted or stained, the nail holes will not be visible.
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