Homeowner Tips
Twenty Percent Wood Moisture, and Why It Creeps Up Here
Twenty percent is a scoreboard, not a verdict. Here is the order to work through, and what each step actually costs toward…
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Tallahassee, FL
Twenty Percent Is the Number Worth Watching
Twenty percent is the figure that lands on the report. Most of what moves it costs less than a single weekend.
Twenty percent is the figure worth holding onto. Excessively wet wood, meaning moisture sitting at 20 percent or above, counts as one of the conditions conducive to subterranean termites that has to be reported on Florida's official wood-destroying organism report. So does wood touching soil directly, cellulose debris under the structure, insufficient clearance between wood and soil, excessive crawl space moisture, construction flaws and improper grading. None of that list is a pest company's opinion. It is what a licensed inspector is obliged to write down, and it is exactly why a wet crawl space shows up as a note on a report during a sale, long before anything has actually eaten a joist.
The moisture arrives here through a specific mechanism. Red Hills clay sheds a summer downpour fast, which looks like fine drainage from the driveway, and then holds the damp underneath where sunlight never reaches it. A crawl space with bare dirt sits directly over that reservoir and releases it into the air, into the joists and into the subfloor all season long. Add a downspout emptying beside the foundation, grading sloping the wrong way back toward the house, and vents designed around a different assumption about humidity, and the result is a structure sitting at inspection-failing moisture through most of the year.
We run moisture control right across Leon County, whether you're in Midtown, Crawfordville, Lake Jackson, or elsewhere around Tallahassee. Sandy fill, wood sitting close to grade and water standing in a low corner after a thunderstorm are what keep subterranean termites going in this part of Florida, so those are what the work is aimed at.
For a house, residential pest control. If the address is a business, an apartment block or a unit being turned over between tenants, commercial pest control is the one you want.
Pests We Treat
- Subterranean termites
- Wood-decay fungi
- Camel crickets
- Millipedes and sowbugs
- American cockroaches
- Springtails
- Fungus gnats
Warning Signs
Signs You May Need Moisture Control
A meter reading sitting at or above 20 percent
Twenty percent is exactly where wood gets written up as excessively wet on Florida's official report, and since it is a measurement rather than an opinion, it becomes the one number on the whole document worth actually arguing about. Ask for the real readings and precisely where under the house each one came from. One elevated reading the week after a storm is a different problem entirely from a floor sitting wet from June clear through October.
Bare soil sitting under the house
Bare dirt breathes moisture into the space above it every hour of every day, and in a county pulling sixty inches of rain a year, that adds up to a great deal of water heading into the joists. A sealed ground cover, properly lapped and weighted down rather than laid loose, is the cheapest change on the entire list and the one that moves the most water. It is the first rung on the ladder, not the last one.
Fungal growth showing on joists or subfloor
White or dark patches on joists carrying a musty smell mean the humidity has run high for a long stretch rather than since last week. This matters more in Florida than in most states, because wood-decay fungi earn their own line on the report here: the form covers organisms broadly rather than insects alone, so fungus counts as a finding rather than a footnote.
Standing water left after a storm
Water still sitting under the house days after the rain has stopped is a drainage problem, not a ventilation one, and no amount of vent work is going to fix it. On the clay side of the county, it usually means the ground is shedding sideways into whatever sits downhill, which happens to be the foundation. On the sand side, it means something is delivering water faster than even sand can absorb it, and that is nearly always a downspout. Treating whatever is breeding in that water changes nothing about the water itself.
How It Works
Our Moisture Control Process
Measure before recommending anything
Wood moisture readings taken at several points, relative humidity checked in the space, and a look at exactly where water is getting in. Numbers come first, since they decide whether this is a ground cover job or a drainage job.
Cover the ground the right way
Polyethylene sheeting goes across the soil, run up to the piers and foundation walls, with the overlaps sealed rather than left loose. A partial cover leaves the wettest corner carrying on exactly as it always has.
Sort out the water first
Downspout extensions, grading corrections sending water away from the foundation, and any plumbing leak fixed for good. Ventilation cannot dry out a crawl space that keeps being refilled from outside.
Then deal with the air
Vent work gets decided only after the water is handled. Options at that point include additional vents, temperature-controlled vents, or closing the vents entirely as part of a sealed system running a dehumidifier. All three are legitimate choices, just for different crawl spaces.
Why this matters
This work sits with a pest company because the state's own conducive-conditions list is really a moisture list. Damp wood, soil contact, debris, poor clearance and bad grading are exactly what draws subterranean termites and feeds wood-decay fungi, and they are the notes that turn up on a report during a sale. Fixing them costs less than treating whatever arrives afterward, and unlike a treatment, dry wood never needs renewing every year.
Licensing & Local Standards
Code-Compliant Moisture Control in Florida
What an inspector has to write down by law
Conditions conducive to wood-destroying organisms have to be reported on Florida's wood-destroying organism inspection report, form DACS-13645. That list covers wood in direct soil contact, cellulose debris under the structure, excessively wet wood at 20 percent moisture or above, insufficient clearance between wood and soil, excessive under-floor moisture, construction flaws and improper grading. Wood-decay fungi earn their own line on that report in this state, a difference worth knowing: Florida's form covers fungi and beetles, not insects alone. Every item on that list is a moisture or housekeeping problem, which is exactly why they are fixable before a sale rather than fatal to one.
A clear report was never the target
FDACS states plainly that most Florida homes over 10 to 15 years old show some evidence of wood-destroying organisms, and that a clear report is neither sought after nor required to close. The report is not a warranty, it clears no structure, and issuing a later no-evidence report once evidence has already been found breaks the rules outright. Read the conditions printed on the reverse, and order the report early in the transaction rather than late.
What this covers
- Polyethylene ground cover
- Foundation vent installation
- Temperature-controlled vents
- Drainage and grading correction
- Wood moisture assessment
No Guesswork
Moisture Control Across Leon County: The Bands
Four bands, and moisture control on a Tallahassee property normally falls into one of them. Which one is decided by the building, and the exact figure is written down once somebody has been under it.
| Size of it | What that buys | Budget |
|---|---|---|
| Single spot | Trouble in one room, one bay of the garage, or one bed out front | an estimated $75–$250 |
| Ordinary house | An ordinary whole-house call, inside and all the way round outside | an estimated $90–$360 |
| Larger house | A larger footprint, or a population already past its first generation | an estimated $135–$575 |
| Been running a while | Sustained pressure, so staged visits plus sealing under the floor | an estimated $215–$955 |
None of this is a quote, because too much of it is decided by what is under the floor or behind the slab edge. The Tallahassee pricing guide works through what moves a figure and what comes as standard.
Questions & Answers
Frequently Asked Questions
Why does 20 percent matter so much?
Because that is precisely where wood gets classified as excessively wet and turns into a reportable condition conducive to subterranean termites on Florida's official report. It is a bright line on a document a buyer's lender will actually read, which makes it a number worth managing rather than arguing over.
Should crawl space vents be open or closed?
It depends entirely on the crawl space, and the decision comes after the water is dealt with. Some spaces do well with extra airflow or temperature-controlled vents. Others do better sealed with a dehumidifier, since on a humid Big Bend afternoon an open vent can bring in air that condenses straight onto cool joists. Anybody answering this without going under the house first is simply guessing.
Is a plastic ground cover enough on its own?
Often it is the single biggest improvement available, particularly where the soil was bare to begin with. It stops being enough the moment water is entering from outside, a plumbing leak is running, or the space has no path for humid air to escape.
Is this not a job for a contractor rather than a pest company?
The overlap is exactly the point. Moisture is the condition producing termites, wood-decay fungi, crickets and roaches under a house, and it falls to a pest inspector to record it. Whoever ends up doing the work, it belongs in the same conversation as the termite plan.
Will drying it out fix the wood already damaged?
No. Drying it out halts the process and protects whatever is still sound. Rotted or infested framing is a repair question in its own right, and it is worth knowing the official wood-destroying organism report is not a structural damage report and says nothing about wood-decay fungi damage.
What does moisture work cost?
A crawl space treatment folded into a service often runs an estimated $85 to $150, while ground cover, vent work and drainage corrections get priced against the square footage and whatever has to be cleared to reach it. Guide figures only, since crawl space height and access change the labor more than anything else in the job.
How much does moisture control cost in Tallahassee?
Use an estimated $89–$239 per treatment as the planning band for moisture control in Tallahassee. Three things move it: how much area gets treated, how hard the substructure is to reach, and whether the yard needs covering as well as the building. The visit that produces the exact number costs nothing, and nothing is added to it afterwards.
Worth Knowing
Background on Moisture Control
Moisture, timing and prevention, given room rather than squeezed into a paragraph.
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One call reaches a licensed local pro, an inspection that costs nothing, and a written scope before anything at all is treated. You are free to walk away at the end of it.
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