A roofer will make roof tiles from clay or slate and floor tiles from clay or stone. In smaller communities often a mason or stone mason will also take on this role, producing tiles during the off season when building is more difficult.
Clay is dug from the bottom of rivers by the tilers themselves or bought from nearby mines. It is then shaped and fired to become hard and impermeable. Laid on to buildings via iron nails or preformed groves, or a combination of both.
While players are generally free to select a citizen role as a background, they should check with the Dungeon Master to make sure it fits within the local area, other party members and does not conflict with the intended adventure.
Citizens have proficiencies in weapons and armour relative to their type and region, so it is not included in the above information, and players do not gain any proficiencies from choosing a citizen background.