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jerryking : materials   2

The Trees and the Forest of New Towers - The New York Times
By Stephen Wallis
Nov. 20, 2019

Mass timber refers to prefabricated structural wood components that can be used to construct buildings — even large-scale buildings — faster, with less waste and eventually with less money........Mass timber refers to a variety of different types of engineered wood components, the most common being cross-laminated timber (known as CLT) and nail-laminated timber (or NLT), in which multiple layers of wood planks, stacked at 90 degrees, are glued or nailed together under pressure to form structural panels. So-called glulams, which are made in a similar fashion and have been around for more than a century, are typically used for long elements like beams and columns.........building with mass timber can ameliorate climate change because it produces less in greenhouse gas emissions than construction with concrete and steel. And wood has the benefit of storing the carbon dioxide trees absorb during their growth, keeping it out of the atmosphere indefinitely.....While cutting down trees to make buildings may not sound environmentally sensitive, mass timber supporters argue that wood could be harvested from sustainably managed forests...At the end of last year, the International Building Code was changed to allow wood buildings of up to 270 feet tall, or the equivalent of about 18 stories, from 85 feet....People want to live and work in these kinds of buildings — they have a sense of connection to the material,”......what we’ve seen from fabricators and builders is that there’s a 35 percent drop in construction time for mass-timber buildings, which means the carrying costs are less.”....
architecture  building_codes  climate_change  construction  design  emotional_connections  lumber  materials  skyscrapers  sustainability  Swatch  timber  wood_products  
november 2019 by jerryking
A library of the world’s most unusual compounds - FT.com
June 20, 2009 | FT | By George Pendle
A library of the world’s most unusual compounds
materials  libraries 
may 2012 by jerryking

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