National Evaluation Service, Inc. 5203 Leesburg Pike, Suite 600,, Falls Church, Virginia 22041-3401 Phone: 703/931-2187 Fax: 703/931-6505 Website: www.nateval.org Report No. NER-215 Re-Issued May 1, 2002 NATIONAL EVALUATION REPORT DIVISION 07 - THERMAL AND MOISTURE PROTECTION Section 07310 - Shingles REPORT HOLDER: CHEMCO, INC. POST OFFICE BOX 875 FERNDALE, WASHINGTON 98248 WWW.CHEMCO.ORG EVALUATION SUBJECT: FTX, CEDARPLUS, DURASHAKE, FST, AND CHEMCO PRESSURE-TREATED WOOD SHAKES AND SHINGLES Copyright© 2002, National Evaluation Service, Inc. This report is limited to the specific product and data and test reports submitted by the applicant in its application requesting this report. No independent tests were performed by the National Evaluation Service, Inc. (NES), and NES specifically does not make any warranty, either expressed or implied, as to any finding or other matter in this report or as to any product covered by this report. This disclaimer includes, but is not limited to, merchantability. This report is also subject to the limitation listed herein. 1.0 SUBJECT Pressure Treated Wood Shakes and Shingles: 1.1 FTX 1.2 CEDARPLUS 1.3 DURASHAKE 1.4 FST 1.5 CHEMCO 2.0 PROPERTY FOR WHICH EVALUATION IS SOUGHT 2.1 Weather Resistance 2.2 Roofing Classification 3.0 DESCRIPTION The shakes and shingles described in this report are sold under the trade names FTX, CEDARPLUS, DURASHAKE, FST, and CHEMCO. 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" treated shakes and shingles. FTX, CEDARPLUS, DURASHAKE, FST, and CHEMCO pressure treated wood shakes and shingles shall be produced from No. 1 grade western red cedar shakes or shingles, complying with the applicable code. Shakes and shingles, having a maximum moisture content of 25 percent, are pressure treated with a proprietary fire-retardant chemical. The bundles shall be labeled as indicated in the Identification portion of this report. Installation shall comply with instructions described herein for the Class A, Class B, or Class C roof coverings, except additional weather protective measures are necessary in areas subject to roof ice buildup and wind driven snow as required by the applicable code. 4.0 INSTALLATION 4.1 GENERAL Wood shakes or shingles shall be installed on minimum roof slopes of 4:12, except as described herein. When wood shingles are installed on minimum roof slopes of 3:12, an underlayment of not less than a listed Type 15 felt complying with ASTM D 226, Type I, shall be used and the installation shall be in accordance with the applicable code and shall be approved by the local building official having jurisdiction. The roof valley flashing shall be fabricated in accordance to the applicable code and applied over an underlayment of not less than 36 inch (914 mm) wide Type 15 felt. The metal shall extend at least 8 inches (203 mm) from the centerline each way for wood shingles and 11 inches (279 mm) from the centerline each way for wood shakes. Sections of flashing shall be overlapped a minimum of 4 inches (102 mm). Maximum weather exposure shall not exceed the value specified in Table 1. The hip and ridge weather exposure shall not exceed those permitted for the field of the roof. 4.2 CLASS A ROOF COVERING FTX, CEDARPLUS, DURASHAKE, FST, and CHEMCO pressure treated wood shakes and shingles labeled "Class B" are installed over ¼ inch (6 mm) thick Dens-Deck® Roof Board, manufactured by Georgia-Pacific Corporation. The Dens-Deck board is fastened either to 1 inch (25 mm) by 4 inch (102 mm) decking spaced in accordance with weather exposure for proper fastening or ½ inch (13 mm) plywood with exterior glue. Dens-Deck board requires a minimum of four fasteners per board to avoid panel shifting. Dens-Deck Roof Board may be substituted with a minimum,seventy two pound mineral surface fiberglass cap sheet complying with ASTM D 3909 and fastened to either 1 inch (25 mm) by 4 inch (102 mm) decking spaced in accordance with weather exposure for proper fastening or ½ inch (13 mm) plywood with exterior glue. An interlayment of 18 inch (457 mm) Type 30 felt is placed between courses on the shake decks. Shake and shingle fasteners shall be long enough to penetrate at least 1 inch or through the sheathing. Other installation details are as described in Section 4.3 of this report. 4.3 CLASS B ROOF COVERING 4.3.1 Shake Installation FTX, CEDARPLUS, DURASHAKE, FST, and CHEMCO pressure treated western red cedar shakes labeled "Class B" are applied over a substrate of 1 inch (25 mm) by 4 inch (102 mm) spaced sheathing boards or not less than ½ inch (13 mm) thick plywood with exterior glue which shall be installed in accordance with the applicable code. An underlayment of Type 30 complying with ASTM D 226, 36 inch (914 mm) wide asphalt saturated organic felt is installed under the 15 or 18 inch (381 or 457 mm) long starter course at the eave line. An 18 inch (457 mm) wide interlayment of Type 30 asphalt saturated organic felt is applied between shake courses in such a manner that no felt is exposed to the weather below the shake butts nor between the individual shakes. Shakes are laid with a minimum sidelap of 1½ inches (38 mm) between joints in adjacent courses. Spacing between shakes shall not be less than 3/8 inch (10 mm) nor more than 5/8 inch (16 mm). Shakes shall be attached to the sheathing with fasteners in accordance to the code, positioned approximately 1 inch (25 mm) from each edge and approximately 2 inches (51 mm) above the exposure line. Nails shall be a minimum No. 13 gauge with a 7/32 inch (6 mm) head diameter and of sufficient length to penetrate ¾ inch (19 mm) into the sheathing or through the thickness of the sheathing, whichever is less. The starter course at the eave shall be doubled. Fifteen inch (381 mm) or 18 inch (457 mm) shakes are permitted to be used for the final course at the ridge. 4.3.2 Shingle Installation FTX, CEDARPLUS, DURASHAKE, FST, and CHEMCO pressure treated No. 1 grade western red cedar shingles labeled "Class B" shall be applied over a substrate of 1 inch (25 mm) by 4 inch (102 mm) spaced sheathing boards or not less than ½ inch (13 mm) thick plywood with exterior glue which shall be installed in accordance with the applicable code. The pressure treated shingles shall be laid and fastened to the plywood decking as described for pressure treated wood shakes in Section 4.3.1 of this report, except that underlayment and interlayment may be omitted in jurisdictions other than those using the BOCA National Building Code. 4.4 CLASS C ROOF COVERING FTX, CEDARPLUS, DURASHAKE, FST, and CHEMCO pressure treated shakes or shingles labeled "Class C" shall be installed as described for the Class B roof covering.