Home   |   Education   |   Membership   |   News   |   FAQs   |   About Us
Members:   Login   |   Register
YouTube   Twitter   LinkedIn   AWC Store
American Wood Council

Courtesy of LEVER Architecture

Tall mass timber is an industry term to identify mass timber buildings that exceed the height limit for wood buildings set by the current International Building Code. Mass timber includes any product currently permitted for use in Type IV construction, such as Cross Laminated Timber, Structural Composite Lumber, glued-laminated timber, and large section sawn lumber.

Because of the unique structural and fire resistance characteristics of solid timber walls and floors (CLT) and mass timber structures, in 2016 the International Code Council appointed a balanced committee of building officials, fire officials, architects, fire protection engineers, and industry experts to examine and propose appropriate code requirements. The committee’s work can be followed at this link: ICC Ad Hoc Committee on Tall Wood Buildings


Tall Mass Timber Courses
  • DES600 – Tall Wood Structures: Current Trends and Related Code and Standard Changes

  • DES602 – Tall Wood Structures: Fire Resistance Design Primer for Mass Timber Construction

  • DES603 – Fire Tests in Support of Tall Mass Timber Buildings

  • DES604 – CLT Adhesive Tests in Support of Tall Mass Timber Buildings

Other Events
Mission to Canada: Mass Timber, CLT & Glulam
March 20-21, 2018
Montreal, Canada

Mass Timber in Architecture
March 28, 2018
New Haven, CT

Mass Timber Intensive Summer Design-Build Workshop
June 24-30, 2018
OSU College of Forestry, Corvallis, OR

Tall Mass Timber News
Code Connections

Code Official Connections is free to qualified governmental employees and is designed for the professional needs of the code administration and enforcement community.

More Information ›

Building Codes

On behalf of the industry it represents, AWC is committed to ensuring a resilient, safe, and sustainable built environment. To achieve these objectives, AWC contributes to the development of sound public policies, codes, and regulations which allow for the appropriate and responsible manufacture and use of wood products. We support the utilization of wood products by developing and disseminating consensus standards, comprehensive technical guidelines, and tools for wood design and construction, as well as providing education regarding their application.

More Information ›

Fire Safety

Resources for code and fire officials on fire performance of wood products.

More Information ›

Mass Timber Fire Testing

ATF Fire Tests

A team of fire experts from the U.S. Bureau of Alcohol, Tobacco, Firearms and Explosives (ATF) working alongside scientists from the U.S. Forest Products Laboratory put identically furnished, multistory, one-bedroom apartments constructed of exposed, partially exposed, and unexposed (protected) five-ply cross-laminated timber (CLT) through a series of rigorously monitored fire tests. The purpose of the tests is to provide data that will help inform any recommendations the ICC Ad Hoc Committee on Tall Wood Buildings (TWB) will propose for the 2021 International Building Code. A series of five tests were conducted. Each test was designed to replicate real world conditions across five scenarios. Identical, furnished, one bedroom apartments were constructed in a multistory building. The door between the living and sleeping areas was left open in both apartments. A three minute video capturing the highlights of each test is included in this playlist.

Full-Scale Fire Tests of a Two-Story Cross-Laminated Timber Structure


SwRI Lab AWC Test Summary

E119 Test Summary


Fire Safety and Protection: During the planning, construction, and occupancy of a building, fire safety is a priority.


Cross Laminated Timber Fire Tests

Full Presentation – 44:00 minutes

Part 1 - Fire Test Materials – 01:24 minutes

Part 2 - Fire Test – 03:08 minutes

Part 3 - Fire Test Results – 07:54 minutes

American Wood Council
222 Catoctin Circle SE, Suite 201
Leesburg, VA 20175

- Public Policy Office -
1101 K Street NW, Suite 700
Washington, DC 20005
- Phone -
General: 202-463-2766
General Fax: 703-771-4079
Publications: 800-890-7732
Publications Fax: 412-741-0609
- Email -
Technical: info@awc.org
Publications: publications@awc.org
Education: education@awc.org
Fire: fire@awc.org
© Copyright 201​8 American Wood Council. All Rights Reserved.