![]() ![]() While BECx may be a new concept to some owners, it plays a vital role in the overall commissioning plan of a building. The building envelope is critical to the performance of any building. If results show the envelope is not performing to the owner’s standards, they can implement solutions as part of an improvement plan. Envelope evaluation may include thermal scanning as well as water and air intrusion testing. By reviewing the original design and submittal documentation, an owner can evaluate the current performance of an existing building. We found that the median costs of Cx were lower for the 2018 sample than for the 2009 sample2.85 per square meter (0.26 per square foot) for existing buildings (a 33 percent reduction) and 8.78 per square meter (0.82 per square foot) for new construction (a reduction of almost 50 percent). 6 to 1.8 of the overall construction cost for the project. One persistent myth is that BECx is solely for new construction, but it can be applied to existing buildings as well. COMMISSIONING Two Cost Models This article will analyze a set of case histories and identify patterns in commissioning costs based on two models. general rule, the total cost commissioning cost will include a design phase and construction phase component and will amount to approximately. LEED v4 allows 2 points when the building envelope is included in the commissioning process activities and follows NIBS Guideline 3-2006 used in conjunction with ASHRAE Guideline 0-2005. A building envelope’s increasingly complex design and construction, often involving multiple contractors and material suppliers, requires a well coordinated systematic approach.īECx (sometimes referred to as building enclosure commissioning) is a quality-based process for evaluating the performance of a facility envelope to determine if a project is meeting the defined objectives, standards, and requirements of the owner.īECx is especially critical when it comes to measuring energy performance. Owners can apply commissioning protocols to any building system, and one often overlooked element is the building envelope system. ![]() Conducting pre-installation meetings and site inspections.Reviewing plans, specifications and submittal documents. ![]() Developing the owner’s project requirements (OPR).The major components of the commissioning process include: Owners should perform BECx as part of an overall commissioning plan. Ideally, traditional building commissioning is a process that begins at the design stage of a project and follows through to the startup and operation of the building (Bonneville 1992). It can also significantly reduce the operating costs associated with poor or ineffective thermal breaks and insulation. to commissioning all energy using systems can be effec-tive enough to constitute consideration of commissioning itself as a demand side measure. Building Envelope Commissioning (BECx) can significantly reduce the primary sources of these failures – air and moisture infiltration. Some of the most common and costliest sources of building failure involve building envelopes. ![]()
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