It is fastened at on end and then stretched from the other. When stretched, the second end is fastened down and then the sides are folded over, caulked and stapled. While the roof is being done others are fastening siding. This may be hardboard, metal or vinyl. This is where the mistakes get found and, hopefully, taken care of.
Trim strips can cover a multitude of things quickly and cheaply.
This is when protective mats are taken off the vinyl and any damage discovered. Carpet is installed, windows are caulked, interior doors are hung etc. The home is hooked up to power, water and gas and everything should get tested. Inspectors are looking for water leaks, dripping faucets, improperly connected light switches etc. This is the point where the some critical management decisions get made.