Solar access roof area

How is solar access determined?

Any roof area that has less than 70 percent annual solar access. Annual solar access is determined by dividing the total annual solar insolation, accounting for shading obstructions, by the total annual solar insolation if the same areas were unshaded by obstructions.

Which residential buildings require PV solar?

An art studio, pool house, ADU and all other types of residential buildings that are NEWLY CONSTRUCTED will require PV Solar. Title 24 Part 6 Energy Code Definition: NEWLY CONSTRUCTED BUILDING is a building that has never been used or occupied for any purpose.

What obstructions should be included in the annual solar access calculations?

For low slope roofs, all obstructions including those that are external to the dwelling unit, and obstructions that are part of the building design and elevation features shall be considered for the annual solar access calculations. Occupied roof areas as specified by CBC Section 503.1.4.

Does a steep slope roof require solar access?

For steep slope roofs only shading from existing permanent natural or manmade obstructions that are external to the dwelling, including but not limited to trees, hills, and adjacent structures, shall be considered for annual solar access calculations.

Do I need a collateral load for solar installation?

Collateral load for future solar installation is not required. What size solar zone is needed on a 10,000 square foot roof with no skylights that is shaded by a neighboring building so that 7,500 square feet of the roof has less than 70% annual solar access?

What orientation should a solar zone be on a steep-sloped roof?

• All solar zone sections on steep-sloped roofs shall be oriented between 90 degrees and 300 degrees of true north. Collateral load for future solar installation is not required.