A Dry Log That Justifies Every Day of Equipment
By Farough Darakhshan
Most of my work is writing final invoices for water-damage jobs and defending them when an adjuster cuts them. Carriers reduce drying charges when there is no supporting dry log, so drying time, how many days the dehumidifiers and air movers stayed in the house, needs its own evidence.
The document that answers that question is the dry log. This note is the standard I write them to.
What a dry log is for
On 09/07/2026 I set a standing rule: a dry log exists to justify the number of drying days we charged for.
That sounds obvious, but it changes what goes in it. A page of moisture readings rarely justifies anything on its own. Readings show that a wall got drier. They do not show why it took five days instead of three.
So the log has to carry the evidence that explains the duration, laid out so an adjuster can follow it without being argued at.
Build the case in this order
1. Equipment math first. Show why that much equipment was needed for that many days. That means the chamber volume, the dehumidifier sizing against the class of loss, and the air mover count against the affected surface area.
If the calculation supports the days on its own, it is the strongest evidence there is, and it can stand alone.
2. Add the conditions that lengthen a dry. When the equipment math does not carry the whole duration, add the conditions that do:
- Outdoor temperature and humidity on those dates.
- Whether the property was occupied.
- The building materials, and how saturated they were.
- Airflow restriction from the layout, which is why a crew adds or repositions equipment.
Every one of these genuinely lengthens a dry. Every one is checkable by someone who was not there.
3. Present it plainly. State the conditions and let the adjuster reach the conclusion. No heading that announces a justification. A report that reads like an argument gets read like one.
The line that keeps it honest
Pick the evidence that explains the days best, but only from evidence that is true.
- Never select readings to reach a number.
- Never drop a day because it is inconvenient.
- Never print a figure no instrument produced.
A dry log that gets checked and holds is worth more than one that reads well, because the carrier checks.
One format, copied every time
On 09/17/2026 I picked one report as the only dry log format. It is a psychrometric drying report with nine sections. Every report since copies its structure, its table shapes, its page layout, and its rules about where each number came from. Only the job's own facts change.
The reasoning is simple. Carriers reduce drying charges for "no supporting dry logs." A format they have already seen survive review is worth more than a prettier one they have not. And a fixed structure turns the next report into assembly instead of design.
The honesty rules travel with the format:
- Any span that is modeled rather than measured is labeled as modeled on the same page.
- A verified reading always beats a curve.
- Unattended days and zones that were not drying are reported as they are.
When the readings only exist as photographs
On older jobs there often is no written dry log at all. The readings exist only as photographs of meter displays in the job's photo record. So the log has to be transcribed, not retrieved.
The pipeline I use for that is plain:
- Pull every photo for the job with its capture time.
- Lay them out as labeled contact sheets to find every instrument display in one pass.
- Crop each display at full resolution and read it.
- Record one row per photograph: instrument, scale, note, and a confidence value. Anything not fully legible is recorded exactly as displayed, with the limitation stated.
- Compute grains per pound from the instrument's own mixing ratio where it shows one, otherwise computed.
- Add an outdoor line from the nearest airport's hourly weather observations, which the Iowa State Mesonet archives for free.
- Split the photo appendix by visit date, so each PDF stays under a carrier's 7 MB per-attachment limit.
Two traps change the numbers if you miss them. Meter photos are often taken upside down and must be rotated before reading. And a single meter body can show relative humidity, wood moisture, or a relative scale, so the mode indicator has to be read off the display. Without it, the value is only "as displayed."
Absence of a photo is not absence of work
Two lessons from the photo record.
Paper readings exist. Some technicians wrote moisture readings on paper and never uploaded them. So a job with no meter in its photos is not a job where no readings were taken. The accurate wording is "no readings were uploaded."
Crews photograph bookends. Most jobs are photographed heavily on the install day and the removal day, with little between. An interior gap is not a defect. Equipment installed on the 13th and removed on the 26th was in the house on the 20th whether anyone photographed it or not. I report the gap as a column, never as a verdict.
What dates a job, and what does not
It is tempting to use a dehumidifier's run-hour meter as proof of duration. It looks perfect. It is not evidence.
Crews do not reset the hour meters between jobs. On one job, three dehumidifiers photographed within the same minute read 02:04, 17:01 and 18:29. No simultaneous install produces a sixteen-hour spread. Two of those units arrived with a previous job's hours still on the clock.
What does date a job:
- Photo capture times.
- Install and removal sheets whose printed address matches the job.
- The first and last capture dates on the job's photo project.
That is the whole standard: the math first, true conditions second, one fixed format, and nothing on the page that an instrument or a dated record did not produce.
Farough (Frank) Darakhshan writes the final invoices for water-damage jobs in Northern Virginia and builds the tools that assemble their documentation. More of his systems are on the projects page.