Tall Timbers – The rise of the wooden skyscraper – UPDATE #1


In recent years, a new trend in high-rise construction has emerged – the development of skyscrapers constructed largely of wood products (can also referred to as mass timbercross-laminate timber, and/or engineered-wood).

Use of these natural materials have the benefits of a reduced carbon footprint (15-20% lower than steel), lighter weight (approximately 1/5 that of concrete), quicker construction times (25% faster), prefabrication, and being a renewable resource.

The list below identifies those skyscrapers (completed or under construction) which are primarily built of timber and =/+ 100 feet in height.

  1. Ascent (Milwaukee, Wisconsin: preliminary site work underway) = 283 feet (as revised in March 2020)/25 stories

Ascent – Source: urbanmilwaukee.com/2020/03/09/eyes-on-milwaukee-worlds-tallest-timber-tower-gets-first-okay/nggallery/image/ascent-2020-rendering-2/

2. Mjøstårnet Tower (Brumunddal, Norway: 2019) = 280 feet/18 stories

3. HoHo Tower (Vienna, Austria: 2020) = 276 feet/24 stories

4. Terrace House (Vancouver, British Columbia: under construction) = 232 feet/19 stories

Terrace House – Source: bdcnetwork.com

5. Sara Cultural Centre (Skellefteå, Sweden: under construction) = 226 feet/20 stories

Sara Cultural Centre – Source: whitearkitekter.com/project/sara-cultural-centre/

6. Brock Commons Tallwood House (Vancouver, British Columbia: 2017) 174 feet/18 stories (hybrid timber tower with a steel and concrete core)

Brock Commons Tallwood House – Source: flickr.com

7. Treet (Bergen, Norway: 2015) = 173 feet/14 stories

Treet – Source: urbannext.net

8. Light House (Joensuu, Finland: 2019) = 157 feet/14 stories

9. Sensation (Strasbourg, France: 2019) = 125 feet/11 stories

10. SKAIO (Heilbronn, Germany: 2019) = 112 feet/10 stories

11. Forte (Melbourne, Australia: 2012) = 105 feet/10 stories

Forte – Source: envirospec.nz

UPDATE – Proud Kanda Surugadai (Tokyo, Japan: under construction – to be completed 2021) = Unknown height/14 stories

A number of other timber high-rises have been proposed worldwide. But, because projects are often proposed without actually being built, the list above only includes those that have been completed or are underway.

One may wonder about possible dangers of tall buildings constructed of wood, particularly fire. In some instances this has been addressed by constructing a concrete and/or steel core surrounded by mass timber or cross-laminated timber construction. Secondly, studies have shown that charred mass timber/cross-laminate timber remains very strong. In fact,

“The unburnt wood, protected by the charred wood, retains up to 100 percent of its initial strength.”

Source: Fire Performance, reThink Wood

Furthermore, studies show:

“During a fire resistance test of a 5-ply cross-laminated timber (CLT) panel wall, the panel was subjected to temperatures exceeding 1,800 Fahrenheit and lasted 3 hours and 6 minutes, far more than the two-hour rating that building codes require.”

Source: http://www.thinkwood.com/news/4-things-to-know-about-mass-timber

As more information becomes available, building codes, particularly here in the United States, will need to be modified to allow taller mass timber structures that the current limit(s). When completed, Ascent in Milwaukee will greatly supersede the current tallest mass timber tower in the United States, Carbon 12, an 85 foot tall apartment building in Portland, Oregon (see image below).

Carbon 12 – Source: apartments.com

SOURCES:

This entry was posted in architecture, art, Canada, cities, downtown, economic development, environment, Europe, geography, history, Housing, infrastructure, land use, nature, new urbanism, North America, Oceania, placemaking, planning, revitalization, skylines, skyscrapers, spatial design, States, Statistics, sustainability, Travel, urban planning, zoning and tagged , , , , , , , , , , , , , , , , , , , , , , , . Bookmark the permalink.

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out /  Change )

Google photo

You are commenting using your Google account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s

This site uses Akismet to reduce spam. Learn how your comment data is processed.