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Visit our website today for more plumbing, construction and remodeling tips. Here's a method you can use to install a new sink in a roof below a kitchen, bathroom, laundry room or in a basement. It won't always be easy, because of the new vent pipe you will need to connect to a vent pipe above floor and you might need to get creative with this installation to make it happen. Check with local plumbers or building authorities to verify plumbing codes in your area.