In a large stockpot (or pasta pot with removable strainer), add the roasted chicken bones, onion, carrots, celery, garlic, bay leaves, and peppercorns.
Add in enough water to fill the pot, and to cover the ingredients inside. Add the salt.
Bring the stock to a simmer (uncovered) on the stovetop for at least 2 hours (longer is better), stirring occasionally.
As the stock simmers it will reduce slightly in volume and intensify in flavor.
Slowly and carefully, remove the strainer basket from the stockpot base If using) and discard the contents.
Cool the stock completely and then strain it into air-tight freezer and/or refrigerator containers.
Notes
**IMPORTANT NOTE - Do NOT give pets chicken bones as they will splinter and be a choking hazard.Chicken stock may be kept in the refrigerator in an airtight container for up to 7 days.Chicken stock may be frozen in an airtight freezer container or freezer bag for up to 6 months.