Sustainable Design Blog

Sustainable Residential Design Considerations for Florida


INTRODUCTION TO SUSTAINABLE DESIGN IN FLORIDA:

Being in a sub-tropical climate, sustainable design in Florida faces some unique challenges. Here are some of our thoughts, especially related to designing a Passive House, and trying to get to Net Zero energy use, in the hot and humid climate of Florida.

Here is a good illustration of climate zones in the USA from the IECC. Note the white line that indicates the Warm and Humid area of the country. Most of Florida is in Climate Zone 2.

 Climate-Zones-From-The_IECC

Need more, related inspiration? Check out these other perspectives that will help you make other green building considerations:



PASSIVE DESIGN SYSTEMS THAT WORK:

Passive Design Systems and design criteria that work well in hot and humid climates:

  • Tight and insulated homes vs. open and breezy homes: Open and breezy homes were the ideal design prior to the invention and wide use of air conditioning.   Air conditioning now allows tight and insulated homes to be more comfortable.
  • Envelope concepts that work well:
  1. Compact shape- reduce the exterior wall area
  2. Continuous insulation- no interruptions in the building envelope
  • Thermal bridge free- make sure there are no thermal bridges in the windows and doors, or in the wall or roof systems.
  • Air tightness- seal the house tightly to avoid air infiltration coming in from outside or the leaking of the conditioned air to the exterior.   Air tightness should be <=0.6 ACH at 50 pascals pressure. (AHC is air changes per hour)
  • The Passive house goal = 75% below energy star requirements with relative humidity (RH) = 40-50%
  • Use good glass in the windows and doors- double glazed, low-e coatings.
  • R>= 38.5 (R- value, insulation)
  • SHGC 0.5-0.55 (solar heat gain coefficient)
  • Use energy recovery system that brings fresh air in


LESSONS LEARNED:

  1. If you get the building orientation wrong, you fight it all the way and it make some of the other energy saving techniques you may be using less effective.
  2. In the south, people add to the interior climate issue by creating heat and moisture inside the envelope. This is beyond the designer’s control.
  3. Energy modeling is not very accurate in predicting net zero energy use. Modeling does not take into account plug loads.
  4. The primary energy demand per person is difficult to estimate.   Mixed climate zones are challenging- heating and cooling criteria need peak loads to insure comfort, in addition to annual loads.

 Check out the recommendations for climate zones in Florida  



Carlson Studio has over 30 years experience helping the following industry define and execute the best and most profitable solutions to successfully execute a green planning strategy:

  • Healthcare
  • Residential
  • Non-profit
  • Educational
  • Hostipality
  • International
  • Mutli-family
  • Religious
  • Commercial

We encourage you to reach out to us and let us help you with your green building project. We are very confident we can assist you in a number of ways. Just hit the button below to make a connection.

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Carlson Studio Garners “Most Outstanding LEED for Homes” Honor

Carlson Studio Architecture took top honors Saturday night in the LEED for Homes category at the U.S. Green Building Council-South Florida chapter’s GALA Verde competition.  President Michael Carlson of Carlson Studio Architecture accepted the first place award on behalf of the firm’s 2009 HGTV Green Home entry at the sold-out event held in the Crystal Ballroom of the Hyatt Regency Pier Sixty-Six Resort in Fort Lauderdale.  The resort is a member of the Florida Green Lodging Program.

“We are incredibly humbled to be recognized with this honor,” Carlson stated from the podium.  “South Florida architecture enjoys an enviable reputation and the caliber of competition this year was considerable.”

Celebrating its 3rd year recognizing and honoring outstanding projects, inspirational businesses, dedicated individuals and chapter members who are LEEDing the way to a more sustainable built environment in South Florida, this year’s GALA Verde was a veritable “who’s who” in green building design and construction throughout South Florida. Eligible entries had to be located in one of the following counties:  Indian River, Okeechobee, St. Lucie, Martin, Palm Beach, Broward, Miami-Dade or Monroe.

Judges evaluated nominees on their demonstration of a holistic approach toward integrating green building and sustainable practices and principles into the design, execution and operation of their project, business or individual leadership efforts as well as the development of innovative solutions to regional challenges.

The HGTV 2009 Green Home is located in the planned community of Tradition in Port St. Lucie on Florida’s southeast Treasure Coast.  The home is LEED Platinum Certified by the US Green Building Council.  It is a 2,430-square-foot contemporary home that incorporates traditional design elements. In addition to Architect Michael Carlson, members of the design/build project team were HGTV Dream Home Planner Manager Jack Thomasson along with Interior Designer Linda Woodrum, Tradition President Wes McCurry, Contractor Leon Camarda and Landscape Architect Scott Davidson.

The four bedroom-three bath home features construction and design elements that are known to contribute to an energy-efficient, cleaner and even healthier living environment.  Sustainable features for the home began by orienting the building to maximize north / south exposures for optimum shading and protect interiors from sun exposure.  Natural day light is captured throughout the house with distinctive clerestory windows above the main open living area and solar tube skylights in the hallway and kitchen.  The changing daylight in the house also creates a sense of time and connection to nature.

Modern roofing technologies such as high solar reflecting materials and a roof garden create a cool, comfortable patio space.  Even though the metal roof appears dark in color with its terracotta red finish, is actually made of a highly reflective material that prevents unwanted heat gain. Solar photo voltaic (PV) cells are discreetly and ingeniously installed above the breezeway connecting the garage to the home.  The cells use renewable energy (solar power) to lower electricity use.

A highly insulated, solid concrete wall system known as Insulated Concrete Forms (ICFs) offers unparalleled storm protection and energy savings.  Water saving plumbing fixtures and rainwater collection for irrigation reduce the house's water demands.  Healthy materials, furnishings and finishes were liberally incorporated throughout the home's interior to provide superior indoor air quality.  Many materials also have recycled content.  The concrete foundation and glass tiles in the bathrooms are some examples of this.

LEED, which stands for Leadership in Energy and Environmental Design, is the USGBC’s standardized 3rd party verification system, administered by the Green Building Certification Institute, for certifying the world’s greenest, energy efficient and high performance buildings.  

For more information about the project

Gala Verde Award
Ben Millar of E3 Building Sciences, Michael Carlson, USGBC-So. FL President Kyle Abney and USGBC CEO Rick Fedrizzi
   

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