ESL-1170 - ICC-ES Listing Report for CLT by Stora Enso

Sep 15, 2026

Uploaded by Aditya

ICC-ES listing report ESL-1170 covers CLT by Stora Enso cross-laminated timber panels used as floor and roof components. It describes the product certification system, including accredited test evaluations, factory inspections, and quality-system surveillance, and states compliance with ANSI/APA PRG 320-2019 and ANSI/APA PRG 320-2012, plus building code requirements referencing CSA-O86-14. The report outlines panel construction, approved lamination properties, adhesive specifications, design requirements, identification marking, installation obligations, and conditions of listing tied to dry service moisture limits.

LanguageEnglish

CategoryResearch & Report

FormatPDF

Pages6

Reading Time15 min

AccessFree to download

Product Certification System

Product and Standards Compliance

Building Code Compliance and Design Requirements

Description, Identification, and Installation

Conditions of Listing

| [www.icc-es.org](www.icc-es.org |)[ |](www.icc-es.org |) (800) 423-6587 | (562) 699-0543 | A Subsidiary of the International Code Council® | | --- | --- | ICC-ES Listing Report Reissued October 2025 ESL-1170 This listing is subject to renewal October 2026. CSI: DIVISION: 06 00 00 – WOOD, PLASTICS AND COMPOSITES Section: 06 17 19 – Cross-laminated Timber Product Certification System: The ICC-ES product-certification system includes evaluating reports of tests of standard manufactured product , prepared by accredited testing laboratories and provided by the listee, to verify compliance with applicable codes and standards. The system also involves factory inspections, and assessment and surveillance of the listee’s quality system. Product: CLT BY STORA ENSO Listee: STORA ENSO OYJ Compliance with the following standards: 􀂠 ANSI/APA PRG 320-2019 , Standard for Performance-Rated Cross-Laminated Timber, APA-The Engineered Wood Association. 􀂠 ANSI/APA PRG 320-2012 , Standard for Performance-Rated Cross-Laminated Timber, APA-The Engineered Wood Association. Compliance with the following building code: CLT by Stora Enso panels, as described in this listing report, has met the structural performance requirements in ANSI/APA PRG-320 and Clause 8.2 of CSA-O86-14 . The materials were evaluated based on analysis and testing in accordance with ANSI/APA PRG-320 . Refer to Table 1 for the layups of Stora Enso CLT panels which meet the layup requirements as noted in Clause 8.2.2 of CSA-O86-14 and Tables 2 and 3 for reference design values which are used to determine Limit States Design (LSD) requirements noted in Clauses 8.3, 8.4 and 8.5 of CSA O86-14. CSA-O86-14 is referenced in the applicable section of the following code edition: 􀂠 National Building Code of Canada® 2015 Applicable Section: Volume 1-Division B: [4.3.1.1](4.3.1.1). (1) Description of product: CLT by Stora Enso is a cross-laminated timber (CLT) panel for use as components in floors and roofs. CLT by Stora Enso panels are plane timber building components which are made of at least three laminations of sawn and planed softwood lumber boards. Adjacent laminations are glued at an angle of 90° . The panels can be produced with a width up to 9.68 feet (2 .95 meters) and a length of up to 52.5 feet (16 meters) . The CLT by Stora Enso panels are manufactured by face-bonding each layer of lamination using a formaldehyde-free, polyurethane-based structural adhesive. The layers are placed in a press to form a dimensionally stable structural element. The laminations within a layer of CLT panels may be edge-bonded by either EPI glue, or a mixture of hotmelt and PVA dispersion glue. Refer to Table 1 for the layups of CLT by Stora Enso panels. Figure 1 depicts the panel layup and section structure of a possible CLT by Stora Enso panel. Wood laminations used in manufacturing CLT by Stora Enso panels must be an equivalent to Select Structural sawn lumber provided in Table 4A of AWC National Design Specifications® (NDS) for Wood Construction; and complying with the report holder’s approved quality documentation. The minimum specific gravity is 0.42. Adhesive used to face-bond layers of CLT by Stora Enso panels and adhesive used for finger-joints of wood laminations are one-component polyurethane based, exterior-type structural adhesives, conforming to ANSI/APA PRG 320 and the product specifications in the approved quality documentation. Design Requirements: CLT by Stora Enso panels are designed in accordance with the applicable code and Clause 8 of CSAO86-14 . Tables 2 and 3 provide reference design values for bending capacities and in-plane shear capacities of CLT by Stora Enso panels, respectfully. The reference design values in Table 2 are intended for Limit States Design (LSD) in accordance with Clauses 8.4 and 8.5 of CSA O86-14 and must be adjusted using adjustment factors in accordance with Clause 8.3 of CSA O86-14 . Maximum deflection of CLT p

FAQs

What is the ICC-ES listing report ESL-1170 about?

It is an ICC-ES listing report for CLT by Stora Enso cross-laminated timber panels used in floor and roof applications.

Which standards and building code section are referenced for compliance?

The report states compliance with ANSI/APA PRG 320-2019 and ANSI/APA PRG 320-2012 and references Clause 8.2 and related clauses of CSA-O86-14, including the applicable National Building Code of Canada 2015 section.

What are the key use and installation conditions?

Use is limited to dry service conditions with moisture content in lumber below 16% for most covered structures, and installation must follow the evaluation report, applicable code provisions, and manufacturer design/installation instructions available on site.

Sep 15, 2026

Uploaded by Aditya