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Installing Interior Window Casings and Sill

In this segment, Bob Ryley tackles window trim in the master bedroom of the new Colonial. He begins with the windowsill, which is predrilled through its leading edge and then secured with 10-penny nails. The first side casing is nailed into place, leaving a 3/16-inch reveal along the window jamb. The top casing is nailed and glued to insure that the boards don't move. After the remaining side casing is hung, the bottom apron is attached. Finally, precut corner return pieces are glued onto the apron to complete the job. The entire assembly will be painted later. More information