Leak Detection
Leak Detection
Finding where it actually got in.
The single most expensive thing in commercial roofing is repairing the wrong spot. A leak that has been “fixed” three times by three contractors is almost always a diagnosis failure rather than a workmanship failure — nobody found where the water was entering.
Why leaks are hard to trace on a low-slope roof
Water entering at a seam can travel a considerable distance between the membrane and the insulation, along a deck flute, or across a structural member before it finds a path down into the building. On a metal deck it can run the length of a flute and drop somewhere entirely unrelated.
That is why chasing the ceiling stain generally fails, and why systematic investigation beats patching whatever looks worst.
How we investigate
- Interior mapping — where water appears, when, and under what conditions
- Correlating leaks with wind direction and rainfall intensity
- Systematic survey of the roof area above and upslope of the interior symptom
- Close inspection of seams, curbs, penetrations, terminations, and drains
- Probing insulation for saturation to map the extent of wet material
- Water testing in sections, isolating one detail at a time
Wet insulation is the hidden cost
Once water is in the insulation it stays there. Wet insulation loses most of its thermal value, corrodes a steel deck from above, and adds weight — and it does not dry out under a membrane.
A repair that seals the entry point but leaves saturated insulation in place has fixed the leak and left the damage. Knowing how far the wet area extends is what determines whether you are looking at a patch or a section replacement.
When repeated repairs mean something else
If a roof is generating leaks in multiple unrelated locations, the issue is usually age and system-wide deterioration rather than a specific defect. At that point continuing to buy repairs is the more expensive path.
We will tell you when the honest recommendation is to stop repairing and plan a replacement or a restoration. See repair vs. replace.
Common questions
City of Winchester, KY publishes local government services and contact information for the area.
Why did my last three repairs not work?
Almost always because the entry point was never found. Water travels before it drops, so the obvious spot above the stain is frequently not where it got in.
Do you use infrared or moisture scanning?
Scanning techniques are useful for mapping saturated insulation across a large roof area. On smaller roofs a systematic survey and controlled water testing frequently answer it faster and cheaper. We will recommend what suits the roof.
Does wet insulation have to come out?
If it is saturated, yes, for the repair to be durable. It will not dry under a membrane, it loses R-value, and it corrodes a steel deck from above.
How long does an investigation take?
A focused investigation on a defined area is usually a half day. A large roof with multiple leak locations takes longer, and we would rather spend the time than guess.
Related: storm debris puncture · emergency repair · roof condition reports · drainage and ponding · infrared moisture scanning. Back to Winchester Commercial Roofing.
Winchester Commercial Roofing · Serving Winchester, Mount Sterling, Paris, Lexington & Clark County, KY · Call or text (859) 310-1209
Last updated August 2026
Related reading: What causes most commercial roof leaks?