What is the process of installing support for basement window?
More information would help with this reply.
Different methods are advisable depending on the size of the window, the direction the floor joists above run and the type of foundation wall.
Assuming that the window is 30" or more wide and the joists run perpendicular to the wall where that window is being installed and that you have a concrete foundation wall that has the sill plate resting on it would be advisable to give the joists above the area where the window is to be installed temporary support and a Header of appropriate size would need to be put in place. Windows are not meant to be carrying weight. If the joists run parallel then such support would not be required. If the window is to be below grade outside the home then a window well of the appropriate size that is drained to the perimeter drain needs to be part of the installation. This is a job for a professional and not recommended as a do it yourself project. As care must also be taken to ensure that no water has entry into the basement and that proper sealing is done in accord with building codes.
Above all read all the instructions of the window manufacturer as to how that particular window is to be installed, either by the instructions supplied with the window or from an on-line source.
I hope this helps...
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