Calculating the ROI of building enclosure commissioning

According to Evan Mills, PhD, a researcher at Lawrence Berkeley National Laboratory, building enclosure commissioning, or BECx, should be viewed as “the single-most cost-effective strategy for reducing energy, costs, and greenhouse gas emissions in buildings today.”

(This article excerpted from BD+C's June 2013 AIA/CES course on cladding and exterior insulation. Take this free course at BD+C University.)

Mills studied the benefits of BECx, noting that commissioning only costs about $1.16/sf for new construction and $0.30/sf for existing buildings on average, with a payback period of as little as 14 months. Savings associated with using BECx from both maintenance and energy savings average about 16% for existing buildings and 13% for new construction. The main benefit is that whole-building energy savings are guaranteed, thanks to the pivotal role of the enclosure in determining efficiency performance.

“Further enhancing the value of commissioning, its non-energy benefits surpass those of most other energy-management practices,” including major first-cost savings through right-sizing of HVAC equipment, Mills has testified. “When accounting for these benefits, the net median commissioning project cost was reduced by 49% on average, while in many cases they exceeded the direct value of the energy savings.”

The National Institute of Building Sciences published its NIBS Guideline 3-2012 on enclosure commissioning last year. The U.S. Green Building Council has allowed the application of BECx to earn an innovation credit in the LEED rating system, and BECx was even considered as a prerequisite, but that proposal lost momentum, says Rob Kistler, AIA, NCARB, Committee Chair for NIBS Guideline 3 and Principal, The Facade Group.

It appears that LEED v4 will not explicitly encourage the detail review, onsite testing, and observation that some enclosure experts say is what makes BECx effective, notes Tristan Roberts, with BuildingGreen’s LEEDUser service. Instead, the new LEED draft language directly quotes NIBS Guideline 3, which describes the following techniques as part of proper BECx for enhanced building commissioning:

• Devise a plan early in the project cycle that describes testing requirements, acceptance criteria, and documentation.

• Review details in the construction documentation to check for overall performance, continuity of weather barriers and insulation, and constructability.

• Conduct observations on the job site as required for critical milestones in enclosure installation, from field mockups to trades startup to field testing.

• Use mockups to benchmark workmanship requirements and ensure compliance with specifications and manufacturer’s installation requirements.

The NIBS committee for BECx, which Altenhofen serves on, recommends including a consulting enclosure expert for the building project, especially in the construction administration phase. The expert will help ensure proposed cladding materials and systems are integrated properly into the design process, followed by visual observations of a statistical sampling of installation of work. Toward the end of the CA phase and before acceptance, a blower-door test will check whether the air infiltration levels are equal to or better than standard.

As noted in the summary of NIBS Guideline 3, BECx helps reduce the chances that inadequate cladding work will be discovered during the punch list phase: “The performance of the enclosure cannot be verified until the entire building is completely enclosed. At this time it is not possible to tune or dial in the performance. To access a nonperforming subsystem or assembly might be very expensive.”

(This article excerpted from BD+C's June 2013 AIA/CES course on cladding and exterior insulation. Take this free course at BD+C University.)

A research project to test next-generation building sensors at Carnegie Mellon University provoked intense debate over the privacy implications of widespread deployment of the devices in a new 90,000-sf building. The light-switch-size devices, capable of measuring 12 types of data including motion and sound, were mounted in more than 300 locations throughout the building.

Affordable Housing | Apr 7, 2023

Florida’s affordable housing law expected to fuel multifamily residential projects

Florida Gov. Ron DeSantis recently signed into law affordable housing legislation that includes $711 million for housing programs and tax breaks for developers. The new law will supersede local governments’ zoning, density, and height requirements.

Department of Energy makes $1 billion available for states, local governments to upgrade codes

Energy Efficiency | Apr 7, 2023

Department of Energy makes $1 billion available for states, local governments to upgrade building codes

The U.S. Department of Energy is offering funding to help state and local governments upgrade their building codes to boost energy efficiency. The funding will support improved building codes that reduce carbon emissions and improve energy efficiency, according to DOE.

Structural steel gas station experience for electric vehicles rendering

Steel Buildings | Apr 6, 2023

2023 AISC Forge Prize winner envisions the gas station of the future

Forge Prize winner LVL (Level) Studio envisions a place where motorists can relax, work, play, shop, or perhaps even get healthcare while their vehicles charge.

Architects | Apr 6, 2023

New tool from Perkins&Will will make public health data more accessible to designers and architects

Called PRECEDE, the dashboard is an open-source tool developed by Perkins&Will that draws on federal data to identify and assess community health priorities within the U.S. by location. The firm was recently awarded a $30,000 ASID Foundation Grant to enhance the tool.

Currently Reading

Calculating the ROI of building enclosure commissioning

Tags

Market Data | Apr 11, 2023

University Buildings | Apr 11, 2023

Architects | Apr 10, 2023

Contractors | Apr 10, 2023

Mixed-Use | Apr 7, 2023

Smart Buildings | Apr 7, 2023

Affordable Housing | Apr 7, 2023

Energy Efficiency | Apr 7, 2023

Steel Buildings | Apr 6, 2023

Architects | Apr 6, 2023

Most Popular Content

Magazine Subscription

Get our Newsletters

Follow BD+C: