Certi-Last® Shakes & Shingles

Long term protection from fungal decay is provided with factory pressure impregnated preservative treatment that will extend the life of cedar shake and shingle roofs.  Warranties on the preservative treatment are available from the treatment manufacturers.


Identification: The Certi-Last® label identifies red cedar shakes and shingles which have been pressure-impregnated with wood preservatives in compliance with the American Wood Preservers Association (C34 Standard). Preservative retention, penetration, and assay sampling criteria shall be in accordance with the AWPA U107and/or CSA 0118.1 Standard.

Material: Certi-Last® products are manufactured using Certi-Split® cedar shakes, Certigrade® cedar shingles, and Certi-Sawn® cedar shakes. The product is sold under the Certi-Last® trademark when treated to the established standards.

Application: Shakes and shingles are applied according to standard specifications of the Cedar Shake & Shingle Bureau. The treatment company may have special requirements regarding flashings, fasteners, etc. Contact the treatment company for more details.

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Recommended Use: Certi-Last® is recommended for use on roofs in areas having a climate index of more than 65 as identified in the USDA Forest Service Techline Durability Paper III -3.

  • Certi-labelTM cedar shakes and shingles are manufactured by members of the Cedar Shake & Shingle Bureau and are graded in accordance with UBC Standards No. 15-3 and 15-4 and/or CSA 0118.1.
  • Contact the treatment company for treatment warranty information, accessory product requirements (including recommended fastener types) and application details for treated cedar material.
  • This is only a product description necessary for selection of materials and grades. For a new roof construction manual and/or wall manual please contact: info@cedarbureau.com