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ICBO Evaluation Service, Inc.
5360 WORKMAN MILL ROAD •WHITTIER, CALIFORNIA 90601-2299
A subsidiary corporation of the International Conference of Building Officials
EVALUATION REPORT
Copyright 1999 ICBO Evaluation Service, Inc.
ER-5404
Reissued December 1, 1999
Filing Category: ROOF COVERING AND ROOF DECK CONSTRUCTION (202)
PRESSURE-TREATED WOOD SHAKES AND SHINGLES
CHEMCO, INC.
POST OFFICE BOX 875
FERNDALE, WASHINGTON 98248
1.0 SUBJECT
FTX, CEDARPLUS, Durashake , FST and Chemco Pres-
sure-treated Wood Shakes and Shingles.
2.0 DESCRIPTION
2.1 General:
The pressure-treated wood shakes and shingles are pro-
duced from No. 1 grade western red cedar shakes or shingles
complying with UBC Standards 15-3 or 15-4. The shakes
and shingles, having a maximum moisture content of 25 per-
cent, are pressure-treated by Chemco, Inc., with a proprietary
fire-retardant chemical. Treated products are identified as
“Class B” and “Class C”. The “Class B” treated shakes and
shingles have higher levels of chemical retention than the
“Class C” shakes and shingles. Products are sold under the
trade names FTX, CEDARPLUS, Durashake, FST and
Chemco.
2.2 Installation:
2.2.1 General: The wood shakes and shingles are installed
on spaced or solid sheathing complying with the code. The
shakes and shingles are installed in accordance with Table
15-B-2 of the code except as noted in this report. On roof
slopes from 3:12 (25% slope) to less than 4:12 (33.33%
slope), installation requires one layer of Type 15 asphalt-satu-
rated felt. In addition to the interlayment between courses,
shakes are installed with an underlayment of 36-inch-wide
(914 mm), Type 30 asphalt-saturated felt under the 15- or
18-inch-long (381 or 457 mm) starter course at the eave line.
Valley flashing must comply with Section 1508.5 of the UBC,
and other flashing must comply with Section 1509. Maximum
weather exposure of the shakes and shingles must not ex-
ceed those exposures in Table 15-C of the UBC. Weather ex-
posure of hips and ridges must not exceed those exposures
permitted for the field of the roof. Starter courses at the eave
are doubled. Fifteen-inch (381 mm) or 18-inch (457 mm)
shakes or shingles may be used for the final course at the
ridge. See Figure 1 for typical installation details.
2.2.2 Class A Roof Covering: Products labeled as
“Class B” shakes or shingles are installed in accordance with
Section 2.2.1 of this report, over spaced or solid sheathing
covered either with one layer of 1/4-inch-thick (6.4 mm) Dens-
Deck) Roof Board, manufactured by Georgia-Pacific Corpo-
ration, or with one layer of 72-pound mineral-surfaced cap
sheet. Fastener length must be increased for the thickness of
the Dens-Deck board or cap sheet. The Dens-Deck boards
are fastened to spaced or solid sheathing using a minimum
of four fasteners per board to avoid panel shifting prior to
installation of the shakes or shingles. The mineral-surfaced
cap sheet is installed with 2-inch (51 mm) overlaps on sides
and ends, and attached with a sufficient number of fasteners
to hold the sheet in place prior to installation of the shakes or
shingles.
2.2.3 Class B Roof Covering: Products labeled as
“Class B” shakes or shingles are installed in accordance with
Section 2.2.1 of this report.
2.2.4 Class C Roof Covering: Products labeled as
“Class C” shakes or shingles are installed in accordance with
Section 2.2.1 of this report.
2.3 Identification:
Bundles of treated wood shakes and shingles bear a label
noting the shingle or shake grading agency and compliance
with UBC Standard 15-3 or 15-4. An additional label is affixed
to each bundle, and bears the treater’s name (Chemco, Inc.),
the product name, the name of the quality control agency
(Fire Tech Services, Inc.), the fire classification and the evalu-
ation report number (ICBO ES ER-5404). Labels for “Class B”
shakes are printed with red ink and labels for “Class C”
shakes are printed with blue ink. See Figure 2 for product la-
bels.
Dens Deck Roof Board and mineral-surfaced fiberglass
cap sheet must bear the label of a quality control agency ac-
credited by ICBO ES.
3.0 EVIDENCE SUBMITTED
Reports of tests in accordance with the ICBO ES Acceptance
Criteria for Fire-retardant-treated Wood Roof Systems
(AC107), dated September 1997, quality control manual and
installation instructions.
4.0 FINDINGS
That the pressure-treated wood shakes and shingles de-
scribed in this report comply with the 1997 Uniform
Building Code , subject to the following conditions:
4.1 The shakes and shingles are treated, identified and
installed in accordance with this report.
4.2 The shakes and shingles are pressure-treated by
Chemco, Inc., in Ferndale, Washington, under a
quality control program with inspections by Fire
Tech Services, Inc. (AA-641).
This report is subject to re-examination in two years.
Evaluation reports of ICBO Evaluation Service, Inc., are issued solely to provide information to Class A members of ICBO, utilizing the code upon which the report
is based. Evaluation reports are not to be construed as representing aesthetics or any other attributes not specifically addressed nor as an endorsement or recommen-
dation for use of the subject report.
This report is based upon independent tests or other technical data submitted by the applicant. The ICBO Evaluation Service, Inc., technical staff has reviewed the
test results and/or other data, but does not possess test facilities to make an independent verification. There is no warranty by ICBO Evaluation Service, Inc., express
or implied, as to any “Finding” or other matter in the report or as to any product covered by the report. This disclaimer includes, but is not limited to, merchantability.10/12/18
Page 2 of 4 ER-5404
Underlayment
Underlayment
Flashing Details For Shingle and Shake Valleys
FIGURE 1—TYPICAL INSTALLATION DETAILS
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Page 3 of 4 ER-5404
Flashing Details for Typical Roof Projections
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm.
FIGURE 1—TYPICAL INSTALLATION DETAILS—(Continued)10/12/18
Page 4 of 4 ER-5404
AA-641
FIGURE 2—PRODUCT LABELS
10/12/18