Are Green Buildings Risky?

One of the most common complaints about green buildings is that they are too expensive.  However, it has been proved that green buildings can be built for the same cost as a traditional structure, or if they do cost more, the extra cost will quickly equal out due to decreased operating costs.  One topic that is often not discussed is whether green buildings can have more problems than a traditional building.

An article published by the Associated General Contractorsof America (AGC) addresses other issues that owners and contractors may need to consider before deciding to build a green building.  The main focus of the article is that using new construction methods and materials increases the risk of potential problems.  As stated in the article, “Simply put, departing from the ‘tried and true’ often means increasing the risk of building failure.” 

One of the main risks involved with green buildings is the potential for moisture and mold issues.  Many green buildings encourage the introduction of outside air to achieve indoor air quality credits, while traditional buildings emphasize dehumidification.  Large amounts of outside air can lead to moisture and mold issues soon after the building is constructed.  A variety of other green building practices can also lead to moisture problems.  Vegetative roofs stay moist and can leak into the structure.  Many green buildings focus on insulation rather than repelling water.  Also, the increased insulation can change the dew point location in walls and increase condensation.  Recycled materials may not shed water as well as traditional materials.  Finally, some methods to improve air quality, such as “building flush out” may introduce an excessive amount of moisture into the building.

Another risk involved with green building is the number of new building products being introduced that claim to be sustainable.  Many of these new products have received a limited amount of testing and may fail to meet their advertised performance levels, compared with proven materials found in other buildings.  This could result in a shorter lifespan of the structure than anticipated and possible safety concerns.

All of these issues should be addressed when designing and constructing green buildings.  If any of these problems do occur, the owner may end up with a useless building.  This could result in a legal battle between the designer, owner, and contractor.  Repair and legal costs could quickly outweigh the money saved in operating costs by building a green building.  Therefore, special care should be taken to be sure that the building will be able to perform either equally or better than a traditional building.  The article recommends three steps to help achieve this goal.  First, a Climate Design Criteria should be developed to encourage the best practices for moisture control.  Next, a Green Building Risk Management Plan should be created to provide guidelines for building the project, as recommended by a variety of experts.  Finally, past projects should be used to determine what practices worked and failed.  Green building is growing at a rapid pace, and while it is wonderful for the environment, we must remember to maintain a high level of building quality so they can be used for many years into the future.