St. Louis recently passed a new law requiring all new buildings to be made solar-ready.
All new structures—commercial and residential—must reserve rooftop sections for solar panels to be easily installed. The ordinance does not mandate that rooftop solar be installed.
The solar-ready zone must be at least 40% of the roof area. It can be one contiguous area or multiple smaller sub-zone areas that are no less than five feet in width at their narrowest point. The solar-ready area cannot be obstructed by pipes, vents, HVAC equipment, or other shadow-casting elements.
Construction documents must outline pathways for routing of piping from the solar-ready zone to the building’s electrical service panel or service hot water system. The electrical panel must also have reserved space for a dual-pole circuit breaker to support future solar installations.
New buildings that have permanently-installed onsite generation systems already, buildings whose solar-ready zones would be shaded from sunlight for more than 70% of the day, and buildings where a licensed design professional has deemed that the solar radiation available to the building is not suitable to a solar-ready zone or because the area requirement cannot be met due to extensive rooftop obstructions, may be exempt.
Related Stories
Codes and Standards | Sep 17, 2019
Zero energy buildings can be constructed with no added upfront cost
ROI can be realized in as little as one year.
Codes and Standards | Sep 13, 2019
Researchers use U. of Arkansas buildings as testbed for CLT panels
Investigation could influence future use of the materials.
Codes and Standards | Sep 13, 2019
At least 30 U.S. cities have adopted stricter building energy codes since 2017
Some followed their states in implementing more robust standards.
Codes and Standards | Sep 12, 2019
Illinois law sets maximum retainage on private projects
The change is expected to give contractors bigger checks earlier in project timeline.
Codes and Standards | Sep 10, 2019
Retreat may be the best option for some coastal communities in face of sea level rise
A new study makes the case for relocating in a "strategic, managed" manner.
Codes and Standards | Sep 9, 2019
Free app calculates maximum allowable heights and areas for buildings
A free app that calculates the maximum allowable heights and areas for buildings of various occupancy classifications and types of construction has been released.
Codes and Standards | Sep 6, 2019
Standard for assessing frame deflection using one component polyurethane foams updated
The standard offers guidance when installing fenestration products.
Codes and Standards | Aug 29, 2019
The high cost of gridlock: $166 billion per year
Growing economy means more jobs, more cars, more hours stuck in traffic.
Codes and Standards | Aug 29, 2019
Industry leaders ask for government help as trades shortage worsens
AGC asks for more funding for education and increased immigration to fill gaps.
Codes and Standards | Aug 29, 2019
Code-conforming wood design guide available
The guide summarizes provisions for the use of wood and wood products in the 2018 IBC.