Mortgage giants Fannie Mae and Freddie Mac are loosening homeowners insurance requirements in an effort to lower one of the "hidden costs" of homeownership. The Federal Housing Finance Agency, which regulates Fannie and Freddie, said the mortgage giants would now accept mortgages from homeowners with a leaner type of insurance that covers only the current value of a roof, rather than its full replacement cost. The policy change, which affects single-family homes and condominiums, has broad implications ...