Overview
Document and track pre-existing cracks in adjacent structures with certified telltale gauges, establishing clear baselines and detecting any growth attributable to nearby construction.
Our inspectors install mechanical crack gauges across existing fractures in neighboring buildings before work begins. Each gauge measures width to sub-millimeter accuracy. Readings are logged each visit, and growth of 3mm or more triggers a PE-reviewed stop-work notice.
Why Liberty Inspection
Liberty’s crack monitoring program protects contractors and property owners by creating an irrefutable, timestamped record of all pre-existing damage. Our PE-certified documentation eliminates dispute and establishes clear accountability from day one of the project.
Pre-Construction Docs
All existing cracks are documented with photos and gauge readings before any work begins on site.
Sub-mm Accuracy
Mechanical telltale gauges detect crack changes to fractions of a millimeter throughout monitoring.
Liability Protection
Certified baseline records shield contractors from unwarranted damage claims during construction.
Threshold Enforcement
A 3mm cumulative growth threshold triggers immediate stop-work review per NYC DOB protocol.
What We Provide
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Gauge Installation & Baseline:
Mechanical crack telltales are adhered across existing fractures at all critical locations, with initial measurements recorded and certified before work commences. -
Periodic Reading Reports:
Each site visit produces a certified log comparing current crack widths against established baselines, with photographs documenting the condition of every monitored crack. -
Exceedance Notification:
When cumulative crack growth meets or exceeds 3mm at any gauge location, our PE issues immediate written notification to the general contractor and project owner.
Common Questions
Why is crack monitoring required before construction?
It establishes a certified record of all damage that existed before work began, protecting contractors from liability for pre-existing conditions and documenting any construction-related changes.
What type of gauges does Liberty use?
We use mechanical telltale crack gauges that adhere directly to the structure. They provide a permanent visual and measurable record of crack movement across horizontal and vertical planes.
How often are crack readings taken?
Reading frequency is determined by construction phase and proximity. During active excavation or heavy demolition, increased monitoring frequency may be required to capture rapid crack changes.
What triggers a stop-work order for crack growth?
A cumulative crack growth of 3mm or more at any monitored location triggers our notification protocol. The PE reviews the data and issues a stop-work recommendation to the project team.
Can crack monitoring protect against neighbor complaints?
Yes. Certified pre-construction documentation provides objective, PE-signed evidence distinguishing construction-caused damage from pre-existing conditions, supporting dispute resolution.
