Category: shelter

Proposed Wooden Skyscraper

wood building
Yesterday we looked at making a key building material, cement, more green and today we’re looking at a skyscraper to be built out of wood. Wood is a much kinder material to the environment thanks to the fact that wood is renewable because it comes from trees.

The idea may sound odd given that wooden skyscrapers may not sound strong or even fire-resistant but all of this is thought out for this building which may get built in Vancouver.

‘Tallwood’ would be made of large panels of ‘laminated strand lumber’—a composite made by gluing together strands of wood.

Trees are a renewable resource, and they help to reduce air pollution. Sourcing from sustainably-managed forests could be deemed more environmentally sensitive, according to CNN.

Unlike concrete—which produces about 6-9kg of carbon dioxide for every 10kg of concrete—wood sucks carbon out of the atmosphere.

And contrary to popular belief, wood actually is quite fire-resistant.

“It may sound counter-intuitive, but performing well in a fire is something inherent in large pieces of wood, that’s why in forest fires the trees that survive are the largest ones,” Green said.

Read (and see) a bit more at Taxi.

The Growing Industry of Green Cement

Cement is a very popular building material for a lot of good reasons, the problem though is that the process of making it requires a ton of energy. This problem has led to a growing number of people looking into ways to make cement less damaging to the planet. We’ve covered cement on here before.

The Smithsonian has a good round-up of the current world of greening the cement industry. In some ways these solutions can work together.

Though still refining its procedures, Novacem is racing with at least five other companies and university centers to come up with a greener cement. “Given all the attention to carbon these days, a lot of entrepreneurs have popped up,” said MIT’s Jennings. “They see the opportunity side.” With cement a $170 billion-a-year industry, investment money is pouring in.

A California company called Calera has perhaps the most unusual approach: It harnesses carbon dioxide emitted from a power plant and mixes it with seawater or brine to create carbonates that are used to make cement. They can be added to Portland cement to replace some or all of the limestone. Calera is backed by a $50 million investment from Vinod Khosla, a computer engineer who is perhaps Silicon Valley’s most respected and deep-pocketed investor in green technologies. “We are actually making our cement out of CO2,” said company founder Brent Constantz. “We are taking CO2 that would have gone into the atmosphere and turning it into cement.” The technology is still in development, with a demonstration plant in Moss Landing, California, and a partnership with a Chinese group to build a plant next to a coal mine in Inner Mongolia, where they plan to use carbon dioxide emissions to make cement.

Calix, an Australian company, makes cement using superheated steam, which modifies the cement particles and makes them purer and more chemically reactive. The process also separates out carbon dioxide, making it easier to capture the gas and keep it out of the atmosphere.

Louisiana Tech University, like Novacem and Calera, is doing away with limestone altogether; it’s using a paste called geopolymer, which is made of fly ash, sodium hydroxide and potassium hydroxide.

Read more

Changing a Mall from Useless to Useful

Dead malls are a problem in too many communities and these malls are occupying large tracts of land that can be used better. Suburbs in North America have to confront the obvious change in front of them and some communities are doing a good thing by making the malls livable for people instead of just for cars.

The redesign will be in line with many new urbanism projects. There will be shops, cafes and offices connected by walkways. Storefronts will be on the first floor and residential units will occupy the top floors. There will also be a mix of cottages, multi family homes, and condos in the neighborhood as to add variety. Parking will still be present but will be hidden behind the retrofitted mall, away from the storefronts.

More info and pics here.

Through the Window Glass

Throughout North America builders construct homes with no regard with how the sun beams down on the, causing many homes to overcompensate with excessively large air conditioning units. This means that do to poor thinking by the builder the homeowner has an increased cost of operating their home.

If you live in one of those buildings built with no regard for the environment there are things you can do to save some money:

While we often think of curtains and drapes as “window dressing,” their primary function, like that of conventional roller blinds and louvered blinds, is to prevent glare and provide privacy. They can also save quite a lot of energy during the cooling season. According to LBNL research, when installed over clear (not low-e) glass, these attachments alone can block 20%–60% of solar gain (depending on material and color), reducing or preventing the need for air conditioning. For comparison, the highest-performing low-solar-gain windows on the market have an SHGC of 0.20 or lower. While that means that those windows block 80% of solar gain while still permitting a somewhat darkened view, they don’t provide much privacy, so many people will still use curtains or blinds.

Combining the two is a good bet: the curtains offer privacy, while the low-SHGC windows block the sunlight before it gets into the house, which is much more effective (more on this in the discussion of awnings below). One drawback of using curtains or drapes is that you may end up with dark rooms and need to turn on lights, which can cut into energy savings. Louvered blinds can be adjusted at the top to let some daylight reflect off the ceiling, but this light will bring some heat with it—especially if you have clear glass rather than low-e. Another option may be a solar screen that filters sunlight and prevents solar gain but still permits a view—although curtains may still be needed for nighttime privacy.

There’s a lot of information and tips on how to improve your windows here.