A junction box includes a housing with sidewalls and a bottom attached to the sidewalls. An exterior side of the bottom is configured to be mounted to a roof of a structure. The junction box includes a flashing attached to the housing and extending horizontally from the housing. The flashing is formed with the housing. The junction box includes fastener openings in the bottom. Each fastener opening is configured for a fastener positionable within the fastener opening. Securing a fastener through a fastener opening contributes to securing the housing to the roof. Each of the plurality of fastener openings in the bottom includes a boss. Each boss extends away from a bottom interior surface of the bottom. Each boss is configured to surround a portion of a fastener above a bottom plane at the bottom interior surface when the fastener is positioned in the fastener opening of the boss.