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Sarasota:
Brent Yoder
brent@cbsroofing.net
4575 Pike Ave
Sarasota, Fl. 34233
941-926-1900 office
941-926-1901 fax
Macon:
Greg Gober
greg@cbsroofing.net
2076 Graham rd.
Macon, Ga. 31211
(478) 788-9979
941-926-1901 fax
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CEDAR SHAKES & SHINGLES
The Cedar Shake & Shingle Bureau is very involved in building code work. Certi-label™
cedar products are manufactured to CSSB-97 grading rules, which have been adopted
by the US International Building Code (IBC) and the US International Residential
Code (IRC) and the National Building Code (NBC) in Canada. The CSSB is active in
the Canadian Standards Association committee and is involved in the code change
process prior to any changes being formalized. Certi-label™ shakes and shingles
meet all national standards for shakes and shingles.
The following code bodies and
manufacturing standards in the United States and Canada govern shake and shingle
manufacturing and application:
- American Society for Testing and Material (ASTM)
- California State Fire Marshall (CSFM)
- Canadian Standards Association (CSA)
- Cedar Shake and Shingle Bureau
- International Accreditation Service (IAS)
- International Building Code (IBC)
- International Residential Code (IRC)
- National Fire Protection Association (NFPA)
- Uniform Building Code (UBC)
All construction projects in the
United States must meet at minimum IBC and IRC standards. Prior to beginning construction,
homeowners and contractors should check with the local building official in their
area to ensure that their project meets all code requirements and adheres to any
local ordinances in place when applying roof or sidewall product.
Hail Resistant
The aesthetic appearance and the natural durability of cedar add property value
to your home. These are just some of the reasons cedar is so often used as a roof
covering.
Cedar shakes are more resistant to hail than most other roof coverings
used today. Cedar shakes have earned a high impact-UL-2218 rating. UL-2218 is the
Underwriters Laboratories test standard for Impact Resistance of Prepared Roof Covering
Materials. The acceptance criteria upon examination after being subjected to the
test procedure is: prepared roof covering material exposed surface, back surface
and underneath layers shall show no evidence of tearing, fracturing, cracking, splitting,
rupture or other evidence of opening of the prepared roof covering layer. For further
information on this testing procedure please visit www.ul.com.
The classifications
for impact resistance are expressed as Class 1, 2, 3 or 4 which relate to a roof
covering's ability to withstand impacts from 1¼, 1½ , 1¾ and 2". diameter steel
balls, respectively.
Certi-label™ 24" x ¾" Handsplit and Resawn shakes carry a Class
4 impact resistance rating, Certi-label™ Handsplit and Resawn shakes 24"x ½" carry
a Class 3 impact resistance rating.
If you live in a hailstorm prone area there
are some insurance underwriting companies that will offer a discount on your premium
if you use a roofing material that is impact resistance rated. In the state of Colorado
for instance, Western United offers a scaled discount depending on the impact resistance
rating.
Identifying the difference in naturally weathered and storm
damaged cedar roofs is sometimes a difficult task. It takes a trained eye to assess
a cedar roof and determine if it is in fact damaged due to hail, or if it is just
naturally weathered. It also takes a trained eye to determine the amount of repair
required.
Wind Resistant
The aesthetic appearance and the natural durability of
cedar add property value to your home. These are just a couple of the reasons cedar
is so often used as a roof covering. Cedar shakes and shingles also prove to be
highly wind resistant roof coverings.
In Miami-Dade County, Florida, where hurricanes
and tropical storms are a common occurrence, roofing systems using Certi-label™
shakes and shingles comply with the International Residential Code.
Certi-label™
shakes and shingles have been subjected to the UL 1897 fourth edition "Uplift tests
for roof covering systems" with exemplary results. The classification for uplift
resistance is expressed in pounds per square foot. The test method subjects a minimum
10 by 10 ft. test sample to various short term (1 minute interval) static pressures
which represent the uplift forces imposed on roofing systems securement to a specified
roof deck when exposed to high velocity winds. In other words it tests how well
shakes and shingles hold up when subjected to high winds. It measures the degree
to which the roofing material is uplifted from the roof deck.
- Certigrade® shingles 90 PSF (pounds per square foot)
- Certi-Split® shakes 180 PSF
A subsequent report by a Florida Registered Professional Engineer converted the PSF numbers into miles
per hour figures using the analytical method for wind design of roof cladding set
forth in Section 6 of ASCE 7-98 (American Society of Engineers). Results, using
no safety factors, are as follows:
- Certigrade® shingles withstood wind speeds of 173 MPH
- Certi-Split® shakes withstood wind speeds of 245 MPH
It should be noted
that these calculations were conducted for a specific house in the Dade County area
of Florida. When converting from PSF to MPH using ASCE 7-98 results will vary depending
on many factors including building height, location, roof slope, environment etc.
Be advised that all design parameters, assumptions and limitations of use set forth
in the Florida engineer's report are necessary components of further interpretation.
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