While suspended, lay-in ceilings have long been the norm in commercial design, the open-plenum ceiling has become trendy and economical, particularly in office and retail environments. However, calculating the tradeoffs between cost and performance can be tricky.
Very little data exists comparing suspended ceilings with open ceilings on the basis of cost and performance. The most recent study came from the Ceilings & Interior Systems Construction Association (www.cisca.org) five years ago. In the study, office and retail spaces were modeled in Chicago, Charlotte, Oklahoma City, Orlando, and Phoenix to reflect the differences in energy costs, climate, and installation costs. Initial construction costs were determined using RSMeans data; annual operating costs for HVAC, lighting, and maintenance were calculated according to Building Owners and Managers Association data.
The study found initial construction costs for suspended ceilings to be 15-22% higher in offices, and 4-11% higher in retail spaces. However, total energy savings for lay-in ceilings vs. open plenums were 9-10.3% in offices and 12.7-17% for retail. A 10.5% energy reduction qualifies buildings for a LEED EA credit, and a 14% reduction is good for two points.
The study attributed the energy performance advantage of suspended ceilings to the use of a return air plenum with low static pressures and fan horsepower vs. ducted air returns with higher static pressures and fan horsepower in open-plenum systems. In addition, return air plenums more efficiently remove heat from lighting systems and reduce the AC load. Suspended ceilings also offer about 20% higher light reflectance, thereby reducing lighting costs.
For more information, see: http://www.cisca.org/files/public/LCS_brochure_rev_9-08_lo-res.pdf.
Related Stories
| Jul 22, 2011
The Right Platform for IPD
Workstations for successful integrated project delivery, a white paper by Dell and BD+C.
| Jul 21, 2011
Bringing BIM to the field
A new tablet device for construction professionals puts 3D data at the fingertips of project managers and construction supervisors.
| May 25, 2011
Developers push Manhattan office construction
Manhattan developers are planning the city's biggest decade of office construction since the 1980s, betting on rising demand for modern space even with tenants unsigned and the availability of financing more limited. More than 25 million sf of projects are under construction or may be built in the next nine years.
| May 18, 2011
Major Trends in University Residence Halls
They’re not ‘dorms’ anymore. Today’s collegiate housing facilities are lively, state-of-the-art, and green—and a growing sector for Building Teams to explore.
| May 17, 2011
Should Washington, D.C., allow taller buildings?
Suggestions are being made that Washington revise its restrictions on building heights. Architect Roger Lewis, who raised the topic in the Washington Post a few weeks ago, argues for a modest relaxation of the height limits, and thinks that concerns about ruining the city’s aesthetics are unfounded.
| May 16, 2011
Seattle unveils program to boost building efficiency
Seattle launched a new program that will help commercial property owners and managers assess and improve building energy efficiency. Under the program, all commercial and multifamily buildings larger than 10,000 sq. ft. will be measured for their energy performance using the EPA’s ENERGY STAR Portfolio Manager.
| May 10, 2011
Solar installations on multifamily rooftops aid social change
The Los Angeles Business Council's study on the feasibility of installing solar panels on the city’s multifamily buildings shows there's tremendous rooftop capacity, and that a significant portion of that rooftop capacity comes from buildings in economically depressed neighborhoods. Solar installations could therefore be used to create jobs, lower utility costs, and improve conditions for residents in these neighborhood.
| Apr 13, 2011
National Roofing Contractors Association revises R-value of polyisocyanurate (ISO) insulation
NRCA has updated their R-value recommendation for polyisocyanurate roof insulation with the publication of the 2011 The NRCA Roofing Manual: Membrane Roof Systems.
