The tacking strips used with carpet stretching can become damaged, or the carpet itself just might loosen over time. Loose carpet can be ugly and risky, and there are some signs to look for to decide if you should call carpet restretching service. If you see a carpet that is raised or come into view to be wrinkled or bumpy, or if you see the edges of the carpet this is an with no trouble identifiable indication that carpet restretching service is desired.