How to Finish the Edge of the Basement Window Jamb

 

It is good for your basement to have windows so that the sunlight can penetrate into the small and dark area of the area. Whenever you installed a basement window, you will definitely notice that there will be a little gap running around the window where the window jamb’s edges touch the rough opening. You could install any technique of standard trim around your basement window. However, you should always remember that the basement windows are usually mounted into cement block walls. Therefore, you cannot just mount any type of trim around your window especially by using finishing nails. Below are some tips that you can learn on how to finish the edge of your basement window jamb.

To finish the edge of the basement window jamb, you need:

  • Tape measure
  • Carpenter’s square
  • Miter saw

Finishing the Edge of the Basement Window Jamb

How to Finish the Edge of the Basement Window Jamb

  • The first thing that you need to do is to do is to measure your window’s length on the top.
    • Make sure that you note down the measurement on your note pad so that you will not forget the measurement once you start your work.
    • Then, set your carpenter’s square to 1/8 inch before you start measuring in from the window casings inside edge area. After that, mark the 1/8-inch reveal along each corner.
  • Next step that you have to do is to set a miter saw to a right-hand 45-degree cut. Ensure that you cut approximately 1 inch from the end of a piece of trim before you could slide the miter saw over to a left-hand 45-degree cut.
    • Once finished doing the above step, you need to transfer the window’s top length measurement that you have measured earlier to the trim.
    • The measuring should start from the trim’s bottom edge and make sure you that you cut the trim starting from the mark that you have made earlier.
  • After that, you should place the trim piece on the wall over the window. You must ensure that the 1/8 inch of the window casing’s edge is revealed by lining up the trim’s bottom edge with the reveal line.
    • Once you have placed a level on the trim’s top edge and you can do some adjustment if it is necessary.
    • Next, you need to trace along the trim’s top edge by using a pencil and then lower the trim from the wall.
  • Next, you have to turn the trim over before placing a tube of construction adhesive with a caulk gun and remove the tip by using your utility knife.
    • Then, you need to run a narrow bead of adhesive down the trim’s center on the back side.
    • Once finished, you can lift the trim back up to the wall and line up the top edge using your pencil line that you have created earlier.
    • The next step is to place a level on the trim’s top edge before you adjust it accordingly and press it securely onto the wall.
  • You must also measure your window’s right-side length and left-side length starting from the top trim’s bottom corners right until you reaches the window frame’s bottom corners.
    • Make sure that you note down the measurement on your note pad so that you will not forget the measurement.
  • Then, you need to cut approximately 1 inch off the end of the other piece of your trim by using the miter saw that you need to set to a left-hand 45-degree cut.
    • Once you finished doing the above step, you need to transfer the measurement for the window’s right-hand side onto your trim.
    • You should swing the saw blade to a right-hand 45-degree cut. Make sure you cut the trim following the mark that you have made.
  • After that, you have to place the trim on the wall before you proceed to butt up the top mitered end together with the top trim’s mitered end in order to form a 90-degree corner.
    • Next, you should set a level on the outside edge of the trim before you could adjust the trim. You must make sure that the window casing has a 1/8-inch reveal.
    • After that, you can trace along the outside edge of the trim by using a pencil.
  • Take a bead of construction adhesive and apply them onto the back of the trim before you start to push it onto the wall.
    • Next, you have to create the third piece of trim for the window’s left-hand side.
    • Make sure that the top cut is set at the right-hand 45-degree cut while the bottom cut should be a left-hand 45-degree cut. Then, mount the trim next to the window just like what you did with the other trim that you have mounted earlier.
  • The next step to do is to measure your window’s bottom width starting from its left-hand trim’s inside corner right until you reach the right-hand inside corner of the trim.
  • As for the fourth piece of trim that is still not being used, you need to cut at least 1 inch off the end of it with a left-hand 45-degree cut.
    • Then, you have to transfer the window’s bottom measurement onto the trim before you cut the trim at the mark with a right-hand 45-degree cut.
    • After that, you need to place the bottom trim piece between the two side trim pieces.
    • Make sure that you check its corners so that it would be able to form a 90-degree bend.
    • Finally, take a bead of construction adhesive in order for you to secure the bottom trim firmly against the wall.

    Always remember that whenever you want to finish the edge of the basement window jamb

    • The most important thing is you get the right measurement of all the above mentioned steps accurately.

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