How To Replace Interior Window Sill And Trim. Following the scribe lines cut a notch into each end of the stool with a jigsaw. With a little DIY knowledge replacing an interior window sill isnt too complicated.
Now measure the opening of your window base. Slide the front end of the pry bar between the trim and the building then pry off the pieces of trim and underlying trim boards1 X Research sourceStep 2 Use expanding foam to fill in wall gaps. If you plan to do a lot of DIY its definitely worth the investment.
Set the compass to the distance from the stools back edge to the sill trim.
Slide the front end of the pry bar between the trim and the building then pry off the pieces of trim and underlying trim boards1 X Research sourceStep 2 Use expanding foam to fill in wall gaps. To avoid damaging the wall hold a wood block against it. Brads spaced about every 6 in. Fine-tune it with a jigsaw chisel or sandpaper.