In construction and architecture, precise measurements and clear communication are essential for successful project execution. One commonly used notation to ensure this precision is "Verify in Field" (VIF). Here's a detailed look at VIF, including why and how it is used.
VIF indicates dimensions that must be physically verified on-site by construction personnel. It is used when designers, engineers, or architects cannot provide exact dimensions on the contract documents due to various reasons.
Distance, budget constraints, or lack of appropriate personnel might prevent a designer from traveling to the site to take accurate measurements.
Several scenarios make it impossible to determine precise dimensions at the planning stage:
Dimensions of new construction might rely on the detailing of adjacent structures, affecting the project's accuracy until these structures are specified.
For instance, dimensions affected by the loading and settling of a foundation might need on-site verification to ascertain final placement.
Necessary to expose structures like subway tunnels to obtain accurate dimensions, which will only be known after exposure.
The use of VIF transfers the responsibility for verifying dimensions from the design team to the contractor or construction manager. Contractors must be aware of the criticality and the potential ambiguity of dimensions labeled VIF.
VIF requirements can impact the schedule since other activities depend on obtaining these verified dimensions before proceeding. The timing of VIF tasks must be planned and accounted for in the project schedule.
VIF dimensions can deviate from initial estimates, leading to potential alterations in the project budget and schedule. Delayed identification or unexpected dimensions can affect costing and timelines.
Subcontractors should be informed and their responsibilities outlined regarding VIF dimensions to mitigate delays and liabilities. Effective communication is crucial to avoid misunderstandings and errors.
Ensuring accurate VIF measurements is crucial. Contractors should involve the design team during these measurements and document the verified dimensions. Communication through verification emails is recommended for clear accountability.
Clearly identify when VIF tasks will occur and communicate any scheduling impacts to the design team and the owner. This proactive communication helps manage project expectations and reduces surprises.
If VIF dimensions substantially differ from expectations, contractors must issue change orders to address any additional costs or time requirements. This process ensures the project remains within scope and budget.
In essence, VIF is a prevalent and simplified method for design teams to shift liability; it has significant implications on the accuracy of a project's schedule and budget. Contractors must comprehensively understand the impacts and professionally manage the liabilities associated with VIF designations to ensure project success.
