Water damage
What a Drying Log Is and Why to Ask for One
Anyone can point a fan at a wet wall and call it dry two days later. A drying log is the difference between that and a job somebody measured — and you are entitled to ask for one.
Water damage is the one kind of building work where the finished job looks exactly like the unfinished job. A wall that has been dried properly and a wall that has had a fan pointed at it for two days are the same wall to look at. You cannot tell by touching it either — the surface dries first and the framing behind it dries last, which is the whole problem.
A drying log is the document that closes that gap. It is a simple thing: a grid with one row per monitored material and one column per day, recording what a moisture meter read. It exists so that "it is dry" is a measurement somebody wrote down rather than an opinion somebody offered.
You are entitled to ask for one before the work starts, not after. A contractor who intends to monitor properly has no reason to mind; a contractor who does not intend to will tell you it is not necessary.
Why there is no single "dry" number
The most common misunderstanding about drying is that there is a percentage that means dry. There is not. Moisture content is expressed as a percentage of the material's own weight, so the same reading means different things in different materials — and what counts as dry in gypsum board is nowhere near what counts as dry in a wood stud.
That is why a drying goal is set per material, and set by measurement: you find the same material somewhere in the building the water never reached, read it, and dry the affected areas back to that. It is specific to the house, the season and the day.
On the Richmond kitchen we documented, the goals on the sheet ranged from 5% for gypsum board to 12% for the wood studs behind the base cabinets, with the tile and the laminate between them. Drying all six components to one figure would have meant over-drying some of the house and leaving the rest wet.
What should be on it
Six things. If a log is missing one of them, ask why.
Which materials are being monitored, by name
Not "the kitchen". A log lists components — the gypsum board on that wall, the studs behind those cabinets, the laminate in the next room. If the water went somewhere, that somewhere is a line on the sheet.
The goal for each one, and where it came from
Each material has its own number. The goal is established by measuring the same material somewhere the water never reached, in the same building, so it reflects that house rather than a figure out of a manual.
A reading per day, per component
With dates. A log with two readings a week apart is not monitoring, it is bookending. The point of daily numbers is that you can see whether drying stalled.
What happened on the days nobody came
A gap is fine. A gap quietly filled in is not. A day with no reading should say so on the sheet rather than being smoothed over.
Which meter was used
A model name on the sheet lets anyone reading it later understand what kind of reading it is — a pin meter in wood and a pinless meter on tile are not measuring the same way.
What came out instead of drying
Some materials do not come back. Particle-board cabinet bases and wet insulation usually get removed, not dried. A log should say "removed" against those rather than leaving a blank that reads like an oversight.
What a log is good for after the job
Three audiences, and the homeowner is only the first.
Your insurer. An adjuster is deciding what the loss actually was. Dated readings showing how far the moisture travelled and what it took to dry it are the evidence that a scope of repair is proportionate rather than optimistic. This is not a guarantee of coverage — coverage is between you and your carrier, and no contractor can promise you otherwise — but it is the material an adjuster works from.
Whoever buys the house. Water damage history comes up in a sale. A folder containing dated photographs, readings and a log is a very different conversation from a verbal assurance that it was handled.
You, in two years. If something reappears in the same wall, the log is the record of whether that area ever actually reached its goal, or whether somebody stopped monitoring on day three because the surface felt dry.
The honest test of a drying log is whether a stranger could read it and tell you what happened in that building. If it would not survive being handed to an adjuster who was not there, it is a worksheet, not a record.
A real one
Rather than describe the format, we publish one. Thedrying log from a Richmond kitchen is on this site with every reading on it, including the day nobody took one and the cabinet that was removed rather than dried. It is six components over six days, and it is the same sheet the homeowner and the carrier received.
We publish it because the argument of this guide is that you should ask to see one, and it would be a strange thing to say without showing ours.
Where the figures on this page come from
Deliberately, there are no industry-standard numbers here. There is no percentage that means "dry" across materials, so quoting one would be worse than quoting none.
- The 5% and 12% goals named above are the figures onthat job's own signed drying log — gypsum board and wood studs in that building, in that week. They are an illustration of how far apart two goals can sit in one kitchen, not targets for yours. Checked 23 October 2026.
- Everything else on this page is how we run the work and what we think you should ask for. Where a figure would depend on your building, your materials or your insurer, this page says so instead of inventing one.
What to ask, in one sentence
Before signing anything for a water-damage job:"Will you be taking daily moisture readings, what are the goals based on, and will I get the log at the end?"
The answer tells you most of what you need to know about how the rest of the job will be run. And if you are in Contra Costa County and would rather talk it through,that is what we do.