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What is ‘Green Construction’?

Sun, Feb 14, 2010

Household

green home

Image: Michal Marcol / FreeDigitalPhotos.net

There is lots of talk about green homes and/or green construction but what does this mean?  First, and foremost, is that the house is built to be energy efficient.   This would include things like insulation of the house, high efficiency heating and cooling systems, heat recovery ventilators (exhaust air heats incoming air), heating/cooling control systems that are programmable, efficient lighting systems (LED or halogen, motion sensing), efficient appliances etc.

Green construction should also ensure that in-door air quality is high.  This is especially important in highly insulated homes that typically have less air exchange with outside fresh air.  A hepa (high-efficiency particle arresting) filter system built into the home HVAC  (heating, ventilation and air conditioning) system provides the best air filtering/cleaning available today. Making appropriate choices for construction materials should also be considered – low formaldehyde materials for drywall, floor sheathing and carpet underlayment and low VOC (volatile organic compounds) ratings for interior finishings like paints, stains and tile grout and finishes help ensure internal air quality.   Natural floor covering materials like cotton, hemp and bamboo do not give off toxic gases like  man-made artificial materials.

Home design can also incorporate many items for green living.  During home construction there are things that can be done very cheaply that if done after market would be very expensive and difficult.  An example is roughing in car recharging facilities, wind power electric generation hookups, or roof-top solar hookups for photoelectric cells or pipes for solar thermal systems.  Accommodating recycling facilities in the kitchen, garage and outside storage for recyclables or composting is best considered at design/construction.

Green homes should consider water supply and usage including  dual flush toilets (two flushes one less water and one more water depending on the need!) , tankless water heater, insulated hot water lines and grey water capture and reuse. A green home should consider water runoff.  Especially in urban areas water runoff creates a problem for municipal drainage systems and can lead to flooding.  Use of water permeable paving materials and disconnecting eaves from storm drains will keep water runoff from entering the municipal water systems.  Capturing rain water can create a green friendly supply of water for landscaping use.

The construction method also needs to be considered.  For example steps should be taken to protect trees during construction and waste materials during construction should be recycled whenever possible.  Construction materials should be sourced locally wherever possible and there are some really innovative new products available such as straw bales for walls, milk based paints, and sustainable harvested wood sources.  Insulated concrete form systems add insulating value and reduce the amount of material required for structural walls and foundations. Also, many materials are now available with partial or completely post consumer recycled content including: drywall, external siding, interior doors, hardwood flooring choices are available from environmentally friendly wood sources such as bamboo or cork.

Checkout http://builtgreencanada.ca for detailed standards information.

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21 Responses to “What is ‘Green Construction’?”

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  19. Carini says:

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