The Star-Telegram reports that in Grapevine, Texas, an amended ordinance will impose restrictions on fences around factory-built home communities.  City officials had discovered businesses operating illegally behind fences, and grass six feet tall that can harbor insects and rodents.  The new ruling will allow four-feet tall fencing that is 50 percent open, such as chain-link or picket fences, around individual homesites, and no taller than an eight-foot solid fence around the community.  City officials had discovered landscaping businesses operating in one community where they stored work vehicles and materials, and piled debris.  Previous ordinances governing factory-built home communities did not address fence issues, so the amended ordinance led to some confusion.