What are the new California Title 24 codes for Residential Re-Roofing?

What are the new California Title 24 codes for Residential Re-Roofing?

Re-Roofing & California Title 24   (Posting date: 1/18/2010)
New Title 24 requirements are now in enforcement as of January 2010.  To download the entire requirement manual (551 pages) click the link here –2008 Title 24 Compliance Manual

Here is a quick Q&A of the new Title 24 requirements:

Q1) Why is it the 2008 Title 24 Compliance Manual?
A – This was originally created in 2008, and was suppose to go in effect in 2009 but was repeatedly pushed back from going into effect until now 2010.

Q2) What does it mean for me a homeowner or property owner?
A – When you choose to re-roof your home you must comply with the new standards to achieve greater energy efficiency.  In other words – California does not want you to put on the bare minimum of a roof.  They are forcing you to upgrade a little bit. You have to put on a roof color that meets the Solar Reflective Index of 16.  If the roof you want does not meet the Solar Reflective Index(SRI) of 16* then you have some alternative upgrade options to be in compliance of new Title 24 codes. (See below)

Q3) What is the Solar Reflective Index?
A – Roofing products with high solar reflectance and thermal emittance are referred to as “Cool Roof”, which refers to an outer layer or exterior surface of a roof. As the term implies, the temperature of a cool roof is lower on hot sunny days than for a conventional roof, reducing cooling loads and energy required to provide air conditioning. The benefit of a high reflectance surface is obvious: while dark surfaces absorb the sun’s energy (visible light, invisible infrared, and ultraviolet radiation) and become hot, light-colored surfaces reflect solar energy and stay cooler. However, high emittance is also important. Emittance refers to the ability of heat to escape from the surface once it is absorbed. Surfaces with low emittance (usually shiny, metallic surfaces) contribute to the transmission of heat into the roof components under the roof surface. The heat can increase the building’s air conditioning load, resulting in increased energy costs and detracting from the comfort level of the home. High-emittance roof surfaces give off absorbed heat relatively quickly through the path of least resistance: upward and out of the building.

Rating and Labeling

Roofing products that are used for compliance with the standards (prescriptive and performance approaches) are required to be tested and labeled by the Cool Roof Rating Council (CRRC). Roofing product manufacturers must have their roofing product tested for solar reflectance and thermal emittance, and be labeled according to CRRC procedures.  – SRI Calculator Worksheet

Q4) Who is the CRRC?
A – Cool Roof Rating Council.  Website is located at http://www.coolroofs.org.

CRRC is responsible for testing, rating and labeling the SRI or Solar Reflective Index of roofing products from composition shingles to concrete and clay roof tiles.

Q5) How do I know if the Roofing Product I want for my home is approved by the CRRC?
A – Brazil Quality Roofing, Inc. can help you with that – or – if you wish to do this on your own you can go to the CRRC website at http://www.coolroofs.org and click on “Rated Products Directory” and input your search for the product you wish by keywords or the options they have available.

Q6) What if the roofing product I want to use is not approved or not listed by the CRRC?
A – You have options.  The new Title 24 codes allow for substitutions or alternate ways of complying with Title 24 energy codes without having a roof with a SRI of 16.  Example: Lets say you want to put on a composition shingle roof and the color is a dark black or charcoal.  What can you do?  Below is a list of all the options available to you to be in compliance with Title 24:

  1. SRI greater than 16
  2. Remove all the ducts from the attic. (Move HVAC unit to a closet etc…)
  3. R-30(11.5”) or in some counties R-38(14.5”) of ceiling insulation.
  4. R 0.85 or greater above-roof-deck thermal resistance over a vented attic. (Counter battens, MonierLifetile Elevated Batten System, or a second deck over a minimum ¾” air space.)
  5. Ducts sealed and tested to existing duct requirements.
  6. Radiant Barrier installed correctly per manufacturers directions.
  7. In Climate Zones 10, 12, and 13 attic ventilation of 1/150 NFVA (Net Free Vent Area) with at least 30% of the NFVA at the peak or ridge of the roof.

 Q7) What Climate Zone do I live in? 

Q8) What are the most cost effective options?
A- Typically adding a radiant barrier or ventilation (F & G) options are the most cost effective, however, the biggest bang for the buck is insulation.  It traps the cool air in the summer and the heat in the winter.  Of course, you can also install items A – G for or a combo of them for greater or greatest efficiency.

More questions on Title 24?  Call us at Brazil Quality Roofing, Inc. at (916)357-5930 or email us at info@brazilqualityroofing.com.  We look forward in assisting you in all your roofing needs.

Michael J. Brazil
Brazil Quality Roofing, Inc.

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