Market Intelligence

Green & Sustainable Construction

What Makes a Building Product Green

Materials in use for sustainable design run the gamut from cotton insulation, to recycled asphalt paving, to photovoltaic arrays. Many of the products offer a green component that is at best incremental, offering performance or some other characteristic that is only slightly better than the conventional product. Use of these products by a small percentage of designers and contractors results in a positive effect that is barely measurable; common usage can make the effect global and lasting.

In our experience, green products fall into the following six categories, and many products have benefits in multiple categories.

Note that these categories are somewhat subjective, and a product that falls into three categories is not necessarily any more green than a product that falls into only one category. Also, environmental claims based on single impacts, such as recycled content alone, should be viewed with skepticism. These claims do not account for the fact that one impact may have been improved at the expense of others.

Green Process

The product is manufactured with consideration for exposure of workers to chemicals, source of materials, energy-efficient production methods, use of recycled materials in packaging, reclaiming manufacturing waste, and prudent use of energy. Since many of these approaches actually save the manufacturer money, these principles are incorporated as manufacturing facilities are upgraded. Even manufacturers of plastics can effectively claim their manufacturing as a green process.

Improved Sustainability

The product is renewable and makes good use of available resources. Use of wood from well-managed forests for building framing is an example of renewable and sustainable product selection.

Sustainability can be illustrated by systems as well as individual products, such as those used to improve the energy performance of the building.

For example, the recent Energy Code Update to the Massachusetts State Building Code requires an air barrier in the exterior wall assembly and insulation located outboard of the metal studs in a brick veneer/steel stud wall assembly. An air barrier can be established simply by taping the joints and perimeter of the exterior gypsum sheathing, but only by using a tape with a very low permeability and a high-performing permanent adhesive. Many architects have chosen to put a continuous air and vapor barrier membrane over the entire wall, again improving the long-term energy performance of the building and reducing the risk of premature failure of the exterior wall. Since the insulation is outside of the membrane, this allows the elimination of fibrous insulation in the metal stud cavity and the vapor barrier behind the interior drywall. Some prefer to limit fibrous insulation, and most acknowledge that an interior vapor barrier is frequently breached during installation or by utility penetrations. The assembly improves the longevity of the exterior wall, decreases the risk of mold in the exterior wall, and improves the energy performance of the building.

Recycled Content

The product is fabricated with post-consumer materials or post-industrial by-products. Many products, ranging from steel, to finish materials, to carpet cushion, are manufactured with recycled content. For example, synthetic gypsum board is manufactured from gypsum deposited on the interior of smokestacks at power plants during scrubbing. The gypsum is chemically the same as naturally occurring gypsum and does not have to be mined. Considering the overall energy consumption and shipping costs of using synthetic gypsum board, it makes most sense to use it within 500 miles of its manufacturing location.

One large gypsum manufacturer claims that 30% of its overall production is synthetic gypsum board. The company recommends that designers consider using their standard products if the project location is more than 500 miles from a synthetic gypsum plant, because the cost of shipping will outweigh the advantage of using recycled materials.

Other post-consumer materials include items such as plastic wood products fabricated using recycled plastic bottles. Products such as structural steel are always fabricated with both post-industrial (waste scrap) and post-consumer (salvaged steel) content.

Recyclable

The product can be reused or reprocessed after use and refabricated. We are most familiar with recyclable soda cans and bottles, but the same can apply to asphalt paving, masonry, metal framing, insulation, toilet compartments, and even carpet. Extruded polystyrene manufacturers claim their product can be reused in roofing assemblies, since the material is not affected by moisture. Manufacturers of gypsum wallboard provide facilities to recycle construction waste from their products.

Low Toxicity

The product is less toxic than comparable products used for the same purpose. Toxic fumes from site-mixed products, coatings, adhesives, and sealants containing such chemicals as formaldehyde and styrenes are a real threat to health, especially in remodeling projects where the building may be occupied while the work is being performed. Exposure to such products as carpet adhesives and high-performance paints has caused problems ranging from discomfort to long-term disability.

All products are now required to have Material Safety Data Sheets (MSDS) listing their components and potential hazards, but most architects have no training in interpreting them. Many hospitals and some computer companies require MSDS submittals before they will allow a product at their construction site or manufacturing facility. Wood particle board manufactured with resins that do not contain formaldehyde offers a less toxic environment for chemically-sensitive individuals and even for artwork stored in museums.

Biodegradable

The product returns to the earth naturally under exposure to the elements. The abandoned barn in the field eventually collapses and disappears. The subway car is dumped into the ocean as a marine habitat, and over time, the steel corrodes. We expect our buildings to last a lifetime, but it is not necessary for products to last thousands of years.

Editors Note: Reed Construction Data has added a green product search capability to Reed First Source and now identifies products suitable for green construction with a green and white leaf icon.


Email

RSS Feed

Member Comments

Posted by Julie McManus
06/03/2010
I couldn't agree more with this article. As an editor for trade publications myself, I just spent some time researching green building materials and found it overwhelming. At the start I found myself believing everything I read. Bamboo sounds like a miracle product, but it goes through a lot before it shows up here. Whenever possible, choose locally made products
Post Your Own Comments 
» Not a member? Register now to become one. Otherwise, login to post your comments on this article.

This article is an excerpt from the book Green Building: Project Planning & Estimating which can be purchased through the RSMeans Bookstore.

This new 3rd edition has been completely updated with the latest in green building technologies, design concepts, standards, and costs. Includes Means' Green Building CostWorks CD at no additional cost.

Buy today and get 20% off!

click here to update your log-in and member information

click here to maintain your company profile & view metrics

Join accessArchitecture Now!
accessArchitecture members get free pre-design leads in exchange for providing project information
Keep Up To Date with eNewsletters
Keep up to date with our variety of complimentary weekly and monthly eNewsletters covering the construction industry.