Section 101.135 - Uniform firewall identification(1) The department shall promulgate rules that specify uniform dimensions, design and other characteristics for signs used to identify firewalls. The rules may not specify firewall signs that are more expensive than necessary to accomplish their purpose.(2) Whenever a city, village or town provides by ordinance for the identification of firewalls, the provisions of the ordinance shall conform to the rules promulgated under sub. (1).