No deck or sliding glass door was on this townhouse. We were able to remove the double window and replace it with a 6 slider without much trouble. This deck also features angled decking and sunbursts. The rear beam was required, due to the way the hou No deck or sliding glass door was on this townhouse. We were able to remove the double window and replace it with a 6 slider without much trouble. This deck also features angled decking and sunbursts. The rear beam was required, due to the way the house was built.