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1 x 4 Wood Trim Around Exterior Window Sill

 
 

Here's another way to install 1 x 4 wood trim around your window, without cutting behind the window sill. As you can see I cut the 1 x 4 on the side of the window around the window sill.

Some carpenters will cut the window sill instead of notching the 1 x 4 wood trim around the window. It all looks the same after it has been painted.

These are common sense construction tips, try to apply different methods of building around around your construction projects.