Mold Inspection In Dishman, WA

Dishman is the west end of the Spokane Valley, the older part, sitting at the foot of the Dishman Hills where the ground rises out of the valley floor. It is one of the earliest developed areas out this direction, and the housing reflects that. Small post-war homes, some 1920s and 1930s stock, low crawlspaces, and a street grid that predates the subdivisions further east.

Two things drive the moisture problems here. The hills above, and the age of what is below the floor.

We test and nothing else. We do not perform remediation and we take no referral fees from the companies that do. Base inspection is $425 including one indoor air sample plus an outdoor control, with no trip fee to Dishman.

Water comes down off the hills

The Dishman Hills rise several hundred feet above the neighborhood, a rocky outcrop of exposed granite and basalt with thin soil and shallow-rooted vegetation. Rock does not absorb water. Spring melt and heavy rain run off the slope and sheet down onto the flatter ground below, which is where the houses are.

Homes at the base of the slope along Dishman Mica Road, Bowdish and the streets that climb toward the natural area get the concentrated version of this. Water arrives at the foundation from uphill, not from the sky above the house. A homeowner sees a wet crawlspace corner in March and assumes a plumbing leak. Frequently it is a drainage path that was established before the house was built and never went away.

Below the slope, the valley floor is glacial flood gravel over the Spokane Valley Rathdrum Prairie Aquifer, which drains fast. That is why almost nobody here has a full basement and why crawlspaces dominate. The gravel is generally forgiving, right up until surface water gets under the house faster than it can move away.

The crawlspace problem, in detail

Most Dishman homes are single story on a crawlspace two to four feet deep. In stock built before 1970, which is most of it, the vapor barrier is either missing entirely or is a partial layer of old poly that has been shredded by decades of plumbers, cable installers and HVAC contractors working under the house.

Bare soil under a home evaporates moisture into the floor framing continuously. It is not dramatic and there is no leak to point at. What it produces over years is elevated crawlspace humidity, damp joists and subfloor, insulation batts that have absorbed moisture and fallen face-down into the dirt, and surface growth on the underside of the floor. Then in winter, when the house is closed and the furnace runs, that air moves upward through the floor system and into the living space. The homeowner smells something in the hallway and cannot find the source, because the source is under their feet.

Alongside that, older Dishman stock carries:

• Original galvanized and early copper plumbing in the crawlspace, with a long service history and slow drips at joints and valves
• Ductwork in the crawlspace, which is common here and which pulls crawlspace air into the system if the returns are leaky
• Additions and enclosed porches built at different times, each creating a roof-to-wall junction where water can enter
• Low siding-to-grade clearance, where sixty years of yard buildup has brought soil up to and sometimes above the bottom of the siding

There is also a septic history in this area. Much of the west valley was on individual septic systems for decades before the county's aquifer protection sewer program brought sewer service through. Homes that converted often still have an abandoned tank and drainfield in the yard, and a collapsed or saturated old field can move water toward a foundation in ways nobody predicts. If you know where yours was, tell us.

What happens during the inspection

A typical Dishman home takes one to two hours. Most of that time is under the house.

Crawlspace assessment. Vapor barrier coverage and condition, standing or ponded water, soil dampness, insulation condition, ductwork and plumbing, and moisture meter readings on joists, rim joists and subfloor. We photograph everything, because most homeowners have never seen their own crawlspace.

Psychrometrics. Relative humidity, temperature and dew point in the crawlspace, the living space and outdoors. This trio of readings usually settles whether you have a leak or an evaporation and ventilation problem, and those need different fixes.

Moisture mapping. Pin and pinless meters on any wall, floor or framing member that is suspect.

Thermal imaging. Infrared reads temperature differentials behind finished surfaces, so we can find wet framing inside a wall without cutting.

Borescope. A camera on a probe into wall cavities and closed spaces through a small discreet hole.

Air sampling. A calibrated pump draws a measured volume of air through an Air-O-Cell or Allergenco-D spore trap cassette. The cassettes go to an accredited lab for direct microscopic examination.

Surface sampling. Swab or tape lift on visible growth. In a Dishman crawlspace this matters, because dark staining on a rim joist is very often old water marking or dust rather than growth, and it is worth knowing before you spend money.

Every job includes an outdoor control sample. Outside air always contains mold spores. There is no fixed indoor number that qualifies as high, so an indoor count with nothing to compare it against is not a result. Elevated means elevated relative to the outdoor baseline collected the same day at the same address. We include that on every job and we will show you the comparison in the report.

Pricing

Base inspection is $425 including one indoor air sample plus an outdoor control. Additional samples are $100 each, so a typical three sample job, meaning the affected area, a comparison area, and outdoors, runs about $525. Homes over 3,000 square feet are $550 to $650, though most Dishman homes are well under that. Post remediation clearance for restoration contractors is $375 flat for up to three samples. Rush 24 hour lab turnaround adds $100.

No trip fee to Dishman. Lab results normally return in one to three business days, and your written report follows within a day of that.

Why the report comes from someone with nothing to sell

Washington licenses nothing in this field. Not mold inspection, not assessment, not remediation. The state Department of Health offers guidance and no more. That means the only real quality signal is method and independence, and independence is scarce because nearly every mold company here also sells the cleanup.

New York recognized the conflict and legislated it away. Labor Law Article 32 makes it illegal for one company to both assess and remediate the same job. Washington has no such statute, so any inspector who wants to be genuinely independent has to give up the more profitable half of the business voluntarily. We did. We test, we write it up, and we are finished. Need a remediation contractor? We will hand you several names and tell you what to ask each one, and we take nothing from them.

The same principle governs what we say about health. CDC has never established a causal link between Stachybotrys and serious illness, and says no test proves an association between a specific mold and particular health symptoms. Documented effects are allergic reaction, asthma triggering and upper respiratory irritation in sensitive people, plus genuine infection risk for people who are severely immunocompromised. That is what we will tell you, and we will not dress it up.

Common questions

My whole house smells musty in winter but I cannot find anything. Where do I look? Under the floor. In this housing stock that odor is most often crawlspace air moving up into the living space, driven by stack effect and by leaky return ducts running through the crawlspace. Psychrometric readings in the crawlspace versus the living space usually confirm it in the first twenty minutes.

Is putting down plastic in the crawlspace enough? It depends entirely on the water source. If the moisture is soil evaporation, a full six mil vapor barrier lapped and run up the stem wall makes an enormous difference. If the source is a plumbing leak, hillside runoff, or an old failing drainfield, poly will trap the water instead of solving anything. That distinction is what testing establishes.

Can hillside runoff really reach my crawlspace? Yes, and it is the specific Dishman failure mode. Water off the slope arrives at the foundation from uphill and enters through the stem wall, through vents, or under a footing. The tell is that it is seasonal, it is always the same corner or side of the house, and it correlates with melt and with big rain events rather than with plumbing use.

We are selling and the buyer's inspector wrote up the crawlspace. How fast can you turn this around? Site visit within a few days in most cases, lab in one to three business days, report within a day of that. If your timeline is tighter than that, rush lab turnaround is $100 and we will fit you in.

Are these old homes worse than newer ones for this? For crawlspace moisture, yes, mostly because of vapor barriers and plumbing age. But newer homes are not exempt. Lawrence Berkeley National Laboratory's compilation of studies puts about 47% of US homes as having dampness or mold, across all ages, and appliance failures do not care what year the house was built.

Book a Dishman inspection

Tell us what you are smelling or seeing, and whether there is a sale or a claim behind it. We will tell you whether testing answers your question before you commit to anything. Appointments in the west valley are usually available within a few days.