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Fire Rated System
EVALUATION REPORT - ICBO Report for CedarPlus Fire Treated Shakes and Shingles
Filing Category:
ROOF COVERING AND ROOF DECK CONSTRUCTION (202)
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ER-5404
Reissued December 1, 1999
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PRESSURE-TREATED WOOD SHAKES AND SHINGLES
CHEMCO, INC.
POST OFFICE BOX 875
FERNDALE, WASHINGTON 98248
1.0 SUBJECT
CEDARPLUS, Durashake, FST and Chemco Pressure treated Wood Shakes and Shingles.
2.0 DESCRIPTION
2.1 General:
The pressure-treated wood shakes and shingles are produced 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 percent, 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 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-saturated felt. In addition to the interlayment between courses, shakes are installed with an underlayment of 36" wide (914 mm), Type 30 asphalt-saturated felt under the 15" or 18" 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 exceed those exposures in Table 15-C of the UBC. Weather exposure of hips and ridges must not exceed those exposures permitted for the field of the roof. Starter courses at the eave are doubled. 15" (381 mm) or 18" (457 mm) shakes or shingles may be used for the final course at the ridge. See Figure1 (page 3) 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 ¼" thick (6.4 mm) Dens-Deck) Roof Board, manufactured by Georgia Pacific Corporation, 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" (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 evaluation 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. Dens Deck Roof Board and mineral surfaced fiberglass cap sheet must bear the label of a quality control agency accredited 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
The pressure-treated wood shakes and shingles described in this report comply with the 1997 Uniform Building Code.
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