California Title 24 Roofing

California title 24 roofing

California’s Building Energy Efficiency Standards for Residential and Nonresidential Buildings (Title 24, Part 6) contains requirements for the thermal emittance, three-year aged reflectance, and Solar Reflectance Index (SRI) of roofing materials used in new construction and re-roofing projects.
The requirements apply to new construction and to retrofits or additions that replace or re-coat at least 2,000 ft2 of roof space for nonresidential buildings and 1,000 ft2 of roof space for residential buildings, or 50 percent or more of the roof surface - whichever is larger. These requirements apply to nonresidential, high-rise residential, and low-rise residential buildings across California’s 16 climate zones. Additionally, roofing products used for meeting the Title 24, Part 6 requirements must be rated and labeled by the CRRC.

Roofing Requirements

The roofing requirements can be found in the following sections of the 2019 Title 24, Part 6 standards:

  • Section 10-113(a, b) (Certification and Labelling of Roofing Product Reflectance and Emittance)

  • Section 140.1 (Performance Approach: Energy Budgets);

  • Section 140.2 (Prescriptive Approach);

  • Section 140.3(a)1 (Prescriptive Requirements for Building Envelopes);

  • Section 141.0(b)2B (Additions, Alterations, and Repairs to Existing Nonresidential,   

  • High-Rise Residential, and Hotel/Motel Buildings);

  • Section 150.1(c)11 (Performance and Prescriptive Compliance Approaches for Low-Rise Residential Buildings);

  • Section 150.2(b)1I (Energy Efficiency Standards for Additions and Alterations to Existing Low-Rise Residential Buildings – Alterations - Prescriptive); and

  • Section 150.2(b)2 (Energy Efficiency Standards for Additions and Alterations to Existing Low-Rise Residential Buildings – Alterations – Performance Approach

Energy Code Brochures

Last year, in 2019 The California Energy Commission has published two new Energy Code Brochures, which include low-rise residential cool roofs and nonresidential, high-rise residential, hotel, and motel cool roofs.

Those Energy two new brochures involve information about the following about the requirements of cool roofs:

  • Solar reflectance, thermal emittance, and solar reflectance index

  • Mandatory labeling requirements

  • Prescriptive requirements

  • Code triggers for roof alterations

  • Exceptions to the requirements

Cool Roof Requirements

Of course, not all cool roofs look the same, as long as there are a number of materials to meet the cool roof requirements, such as metal, coatings, and asphalt. They are also available in a wide variety of colors involving dark, as well as vibrant shades.

A Cool Roof Can:

  • Look good

  • Keep your building cooler

  • Increase occupant comfort

  • Lessen energy cost

  • Last Longer (comparing with conventional roofs)

  • Reduce temperature of attic and roof

  • Decrease energy use on hot days

  • Help greenhouse gas and air pollution emissions

  • Comply with building energy standards and green energy programs.

The Energy Commission recognizes the Cool Roof Rating Council (CRRC) for rating the solar reflectance and thermal emittance values of roofing products. Only the aged solar reflectance and emittance values listed within the CRRC Rated Products Directory may be used to meet the cool roof requirements in the Energy Standards. All rated roofing products will have a CRRC label, with the efficiency values listed.

cool roofs

Energy-Efficient Roofs

Energy-efficient roofs are also known as cool roofs. These roofs are designed to reflect more sunlight and absorb less heat than a standard roof. Energy-efficient roofing products have high solar reflectance and thermal emittance properties. These properties help lower roof and attic temperatures on hot, sunny days to reduce the need for air conditioning. Both properties are measured from 0 to 1, and the higher the value the cooler the roof.
Solar reflectance (SR) refers to a material’s ability to reflect the sun’s solar energy back into the atmosphere.
Thermal emittance (TE) refers to how much of the absorbed heat is released.
What is the solar reflectance index? This is an alternative to meeting the minimum requirements for thermal emittance and aged solar reflectance in the prescriptive approach. An SRI calculation allows for tradeoffs between thermal emittance and aged solar reflectance values. The Energy Commission’s solar reflectance index calculator must be used to determine the SRI value. The calculator is available on the Energy Commission’s website.

Long-Term Viability Roof

When investing money into your property portfolio, staying aware of potential pitfalls can have a major financial impact. As a building’s owner, you are understandably focused on having a long-term viability roof.

Some risks may be unavoidable, but others can be drastically reduced by taking small actions early on to strategize against the odds. Nowhere can a structural investment go south more quickly than with inadequate roofing. Whether constructing a completely new building or taking on an existing structure, issues caused by poor roofing design can quickly push your budget through the roof.

Nobody would expect you to keep track of all design and material-related aspects of your asset protection strategy that is what you hire the experts for. We can provide the knowledge and context needed to make more strategic roofing design and repair decisions. Elevating your roofing strategy starts with two words: cover boards. Even if you plan to own a building for a long time or turn around and sell it, cover boards are a reliable way to add comprehensive durability and long-term damage resistance to the roofing assembly.

Roof Assembly Design

Of course, you want the best roof assembly design from your roofing consultant at the lowest possible cost. But if you are not careful, you may sacrifice important quality considerations without realizing what you are giving up. When preparing the best roof assembly design for your building’s specific needs that includes occupant assets and climate conditions, the consultant will most likely create a design that includes a high-performance rigid cover board.

What is it and why does it matter? - A cover board is a sturdy substrate attached beneath the roof membrane for added support to help maintain structural integrity and protect the insulation, which is the most expensive material to replace. But added doesn’t mean unnecessary. Roofing assemblies that include a high-performance cover board also reduce the risk of damage from a variety of sources, such as fire, moisture, wind, and impact for example hail, heavy foot traffic, hefty equipment, and so on.
Yet, too often, the cover board gets removed from the final design and proposal to save cost.