Combining Two Double Hung Windows Bob explains the homeowners wish to have windows centered in the wall so that bookcases can be added. Since the home’s windows were replaced just three years ago the crew is recycling the windows in the new project. Ryley and Bob demo the old frame and install supports for the combined window. Ryley shows how the dining room window in the den can make one great double-hung window. When the two windows are put together it’s called a mullioned window.

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