Outside mount or ceiling mount.
Inside mount blinds vinyl windows.
When installing them inside the opening make sure the bottom.
Mark the positions of the bracket holes with a pencil.
Try to mount them in a position that will allow the screws to sink into wall studs especially for large bulky heavy window blinds.
Fix the brackets to the top or sides of the inside opening or install them outside the opening.
The vinyl is not strong enough to hold the weight of the blinds.
If you have vinyl windows you won t be able to screw the brackets directly into the vinyl channel that holds the window.
Finally vinyl window frames can make it tricky to install inside mount blinds because the vinyl isn t strong enough to directly support the weight of the blind.
An inside mount is when blinds or shades are installed inside the top of the window frame.
The window treatment brackets are either screwed into the ceiling of the window opening or sides.
There s no wall on either side of the window just the other window frames.
For inside mount the brackets are attached to the top of the opening directly on the trim or on the sides.
The top of the window frame is flush with the ceiling so the only other option is to hang the blinds from the ceiling which seems less than optimal.
I want to hang blinds on the center window in a three window window seat.
For outside mount the blinds are screwed onto the window trim or anchored into the drywall or into the plaster.
Use a tape measure if needed to place the brackets.
Installing window treatments as an inside mount gives your windows a clean finished look allows blinds or shades to be flush with the trim or wall and doesn t cover decorative molding.