Message Forums

Hi my guess it means that the porch groundsheet is stitched onto the bedroom inner. From the pic it appears to have a lip along the bottom of the door too, so it maybe fastens up inside the flysheet too, to create a "bath tub" shape. 

Any GS will collect the rain if it sticks out beyond the bottom edge of the flysheet. So it pays to make sure everything is tucked in, and with a sloping door rain will always get in when you are using the door in wet weather so a tarp shelter is the only answer.