How To Install an Interior Window Sill

If you have yet to get a windowsill, then you might want to accent your window by installing one. It does not only do you good aesthetically but also provides functionality. It’d provide you with a horizontal space adding depth to your window and providing you a place to put your potted plants or your mug or even that pie you just baked to cool it down. I’d assume though that you already have an existing sill, and the reason for installing one is to replace the current, which might already be unstable or even broken.

  • First thing to do is choose the type of wood you are using. You can use oak, maple, walnut, or just about any type of wood you fancy. If you are not familiar with types of wood, you can just bring a piece of the existing one you have and bring it over to the hardware, they will be able to assist you there.
  • If you used caulk to seal the window, you might want to loosen it first by running a utility knife or your putty knife (this will be better as it is usually used for these kinds of tasks).
  • Next thing you do is trace a pattern of the sill you are replacing. You can use the existing sill and trace it on top of a wooden board, but it be best if you use a large piece of paper or cardboard, so in case you are not able to pry the existing sill out in one piece. It wouldn’t be that hard to trace it over. You can trace it on the paper by using a marker. Preferably a pencil, so you can cut out the paper with accuracy.
  • When removing the existing sill, you need to be careful prying it out to avoid further damage on the wall or aprons.
  • Next thing to do is tracing the paper over the piece of wood you will be using. You can also clamp the paper on the wood if you have the tools. This way you do not have to painstakingly trace it over. Then using your power tool (if you have one) cut out the new pattern of the sill you are going to use. Be careful in doing this to avoid unnecessary injuries.
  • You might want to sand the sides of the sill to have a smooth finish. Do not over do this so your new sill still fits perfectly on your window or casement.
  • If it’s not a casement window, you need to use aprons to keep them stable. You can also use small L-frames but they might take a bit off the style you’re trying to achieve. If the existing aprons are still stable, you can still use them to save you some money.
  • You can use wood glue to attach the new sill or nails, whichever is required. Also put caulk to seal if needed.
  • Last thing to do is hide the evidence of repair. You do want an obvious repair, so you just need to match the paint if damaged by removing the previous sill, and finishing with stain or varnish, whichever is appropriate. Allow time to dry.

You can now relax and look outside the window with your plant/s and enjoy a cup of coffee and maybe a piece of cake on your new sill for a job well done.


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