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
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:
A)SRI greater than 16
B)Remove all the ducts from the
attic. (Move HVAC unit to a closet etc…)
C)R-30(11.5”) or in some
counties R-38(14.5”) of ceiling insulation.
D)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.)
E)Ducts sealed and tested to
existing duct requirements.
F)Radiant Barrier installed
correctly per manufacturers directions.
G)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.
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.
