How to Install Butted Window Casing How to Install Butted Window Casing

What You'll Need
1x4 Pine boards
Circular saw
Tape measure
Air nailer/hammer
2-inch galvanized nails
Square
Saw horses
Wood putty
Sandpaper

A window casing can be built in a couple of different ways. The first is by using mitered corners so that they all have 45-degree angles and frame your window in. The second is with butted edges. This is the easiest way for a do-it-yourself homeowner to install a window casing. Here are the steps involved in building your own window casing with butted joints.

Step 1: Measure Top and Bottom Sills

To start installing your butted window casing you will need to start with the top and bottom sills. Measure the top portion of the casing and write it down. Use your tape measure and find the measurement for the bottom portion of the casing. Write this measurement down. 

Step 2: Cut Boards to Length

Once you have your measurements you can cut the top and bottom parts of your window casing. Place the board for the top part on the saw horses with the part that will be cut off extending away from the saw horses. Mark the measurement on the board and make straight with the square. Cut it to length with the circular saw. Repeat this process with the bottom portion of the window casing. 

Step 3: Install Top and Bottom Parts

With the two pieces cut to length, you can then install them to the window. Apply some construction adhesive around the perimeter of the top board and press it into place above the window. Tack into place with a few nails in each corner. Apply construction adhesive in the same manner on the bottom board and press it into place. Again, tack it in place with a few nails in the corners.

Step 4: Measure for Side Pieces

Now that the top and bottom are in position you can measure for the side pieces. Take two separate measurements to ensure that the boards will fit correctly. Start measuring from the top of the top portion of the casing and go until you reach the bottom part of the bottom piece of the casing. 

Step 5: Cut Side Pieces

Take the measurement and transfer them to the appropriate board for each side of the casing. Use a square and make sure that the lines are straight. Cut them to length with the circular saw. 

Step 6: Install Side Casing

With the two pieces cut-out you can then install them into position around the window. Apply some construction adhesive to the back of the board, same as you did with the top and bottom casing pieces, and press it into position. Tack it into place with nails in each corner. Do the same with the other side.

Step 7: Secure and Putty

When you are satisfied with the look of the window casing, you can secure it better by placing nails along the perimeter of the boards every 6 to 10 inches. Fill the nail holes with wood putty by pressing a little into each hole. Once the putty has dried you can sand them smooth.

Step 8: Stain or Paint

With the putty sanded down you can then stain the wood or paint it. 

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