Once again, sustainable modular construction is being featured in the GreenZone area at Greenbuild 2012. For anyone who missed it last year, the GreenZone, which is spearheaded by Building Design + Construction and Professional Builder magazines, made its debut in Toronto with a prototype for a medical facility. This year in San Francisco, there are two structures available for tour: a net-zero, LEED-designed home and an innovative green classroom designed to meet rigorous indoor air quality requirements. Both prototypes mark the convergence of an outstanding project team, including Bogue Trondowski Architects, Method Homes, Portland State University, Blazer Industries, Pacific Construction Services and Oregon Solutions. (And, yes, we’re very proud to have two CertainTeed products — AirRenew Indoor Air Quality Gypsum Board and Sustainable Insulation — included as well!) If you are at the show, be certain to stop by the GreenZone located just outside of the North Hall.
Lucas Hamilton is Manager, Building Science Applications for CertainTeed Corporation
If you follow organizations and companies dedicated to sustainable solutions such U.S. Green Building Council, Leadership in Energy and Environmental Design (LEED) or even this Blog you have probably seen an increased discussion about VOCs or Volatile Organic Compounds. But I am not sure that people, in general, are aware of how pervasive VOC’s are in our lives.
By definition a Volatile Organic Compound is an organic material with a growing point less than 250° Fahrenheit. For most of us this means that these organic compounds tend to exist as gases. They are in many products that we buy and they also can occur naturally. They have a wide range of adverse health effects including eye and respiratory tract irritation, headaches, dizziness, visual disorders, and memory impairment in other words, they are not good for you! Organizations such as the Environmental Protection Agency (EPA), Occupational Safety and Health Administration (OSHA) and Health Canada have clearly spelled out the effects of long-term exposure to elevated concentrations of VOCs.
Most people recognize the presence of VOCs by their smell. They have a distinctively unnatural smell. I always tell people if it smells bad it is bad. We all have a genetic memory in our bodies that identify bad smells.
As I have mentioned in a previous blog about tightening the building envelop, VOCs are all around us. They are found in cleaning products we use, carpeting, paint, lacquers, printing products – there is an exhaustive list.
When VOCs are part of interior air you only have three methods of reducing them: capture them, kill them off, or ventilate them away. In terms of capture ordinary particle filters do not work. Filters made of activated charcoal are good at capture but these filters don’t work at the high air speeds which occur within our HVAC systems. Emerging technologies, such as AirRenew® which we’ve spoken of before, provide a new means of sequestration which HVAC filters do not. To “kill them off” requires ultraviolet light (UV). Formaldehyde, for example, has a 14 day half life in the presence of UV but we don’t have much UV inside our buildings. This leaves ventilation as a functional option. Providing fresh air ventilation rates in accordance with ASHRAE 62.1 for commercial buildings and 62.2 for residential buildings is a good place to start.
Trust your olfactory system – if it doesn’t smell right you may have a build-up of volatile organic compounds!
Glenn Jackson is Director, Corporate Marketing for CertainTeed Corporation
Part of the conversation regarding sustainable design is a move toward improving performance and addressing specific needs of the potential occupants of a particular space.
The building industry has historically designed buildings based only on the need to provide a place for people to live, or go to school or to heal when sick.
Today, so much more is taken into consideration. Product manufacturers, the design community and even building owners are much more focused on asking “What problem are we trying to solve” or “What elements need to exist in a building to help address performance based criteria such as, learning, healing, innovating and working.
Creating unique spaces is becoming more the norm even within what we refer to as vertical markets or niche markets which meet the needs of a particular industry. Standards for design or performance may exist within a vertical market such as educational facilities or healthcare facilities but each project will have specific needs driven by geographical and environmental conditions, uses for the spaces, aesthetics and building owner preferences.
Some of the areas most critical to building sustainable and performance-based structures are thermal and acoustical comfort which is not seen but does affect our physical comfort and wellbeing. Visual comfort speaks to our need for natural light. Innovations in glass products are revolutionizing the industry. Indoor air quality is crucial in all buildings and systems, and products are available to address most concerns for creating clean indoor air.
In the end, the efforts made to design and build high-performance, sustainable, buildings with solution based systems will provide significant savings for the end users.
Lucas Hamilton is Manager, Building Science Applications for CertainTeed Corporation
Many of our houses have attached garages which are, for the most part, unconditioned space within our habitat. It is the interface of these two spaces which so often fails in our attempts to conserve energy and have superior indoor air quality.
For starters, you have to make sure that the garage is air sealed from the rest of the structure because of what you store in that space. You store things in your garage because you want them out of the weather but you don’t want them “indoors.” Very often negative pressure is generated in the home by exhaust fans and dryers. In your home’s attempt to reach a neutral pressure with the exterior, it will often pull air from the garage into the home. Now all of the gaseous and particulate contamination which is associated with what you are storing and doing in your garage is coming into your home. Think about what is on the other side of these “interior” walls – typically they are the rooms where we spend the most of our waking hours; kitchen and family room. If the separation plane between these spaces is not made air-tight we might as well move into the garage.
One small detail which is best addressed during the time of construction is breaking the continuity of framing chases between the garage and the house typically found in the garage ceiling. As the second floor framing runs continuously across one of the garage interior walls, air-tight blocking needs to be installed between floor framing to close this avenue of air migration. This is obviously easier to achieve with dimensional floor framing or “TJI” (Trus Joist I) than it is with modern trusses. Also ensure that any doors leading from the garage to the living space are properly sealed and air tight. Get a new door sweep if the old one is worn out. One great indicator of an air leaky passage door is a dirt “shadow” in the carpet just inside the sweep. Carpet fibers make excellent air filters and atypical soiling patterns are great indicators of air flows.
Once you’ve decreased uncontrolled air flow between the home and the garage is there added value by adding an insulated exterior garage door? Absolutely! Any way that you can tighten or insulate the envelop will improve the efficiency. When you are making any changes with regard to air tightness in the home don’t forget to include the garage in your decisions.
Ashwin Himat is Director of Marketing – North America for CertainTeed Gypsum
New innovations in technology are redefining building products industry-wide. Manufacturers are improving products today based on solutions to environmental concerns and to address indoor environmental quality. Wallboard is no exception.
Historically, wallboard enabled residential and commercial construction to provide better fire protection and a flat, smooth surface that could be easily painted or wallpapered. Because of the recycled content of wallboard, it has always been considered a sustainable product but its function rather than its features were the primary selling point.
The drivers for innovation of wallboard products predominately came from the commercial build community. Earlier innovations in wallboard provided moisture resistance for areas of buildings with high moisture such as bathrooms and kitchens. With increased concerns and claims regarding mold in buildings, a technology was developed to provide mold and moisture resistance to wallboard. Mold is a potentially serious health issue for people so the ability to include a mold resistant wallboard in a home or building susceptible to mold reduces the potential.
With the rapidly growing awareness of the importance of indoor air quality and its impact on health and productivity, recent technology innovations have led to the introduction of wallboards that clean the air. By removing volatile organic compounds (VOC’s) such as formaldehyde and other aldehydes from the air and converting them into safe, inert compounds, these wallboards can improve indoor air quality for generations.
In response to the growing marketplace demand for acoustic comfort, manufacturers have increased innovations in the area of noise-reducing gypsum board, specifically designed for wall systems requiring high STC ratings where acoustic management is needed.
The commercial build community is aware of these advancements in wallboard and they are including them in specifications especially in the educational and healthcare arena. But these wallboards adapt well to residential construction as well especially when designing custom homes that may include home theaters or music rooms.
Homeowners need to be educated about the options they have when either building a new home or expanding an existing one. Decisions made about the walls and ceilings of a home should be carefully considered because ones overall comfort depends on it.
Wallboard is not a one size fits all product any longer so when it comes to improving comfort and indoor environmental quality remember to consider the best solutions for your walls and ceilings.