Knowledge Base

Crawl Space Resources and Guides

In-depth guides written for Portland-area homeowners on Oregon code, Energy Trust rebates, encapsulation ROI, and seasonal moisture problems. All work described is performed by independent licensed contractors.

• Mold in a Crawl Space: How to Identify It and What to Do

  How to tell whether what you are seeing is actually mold, how serious it is for the house and the people in it, whether testing is worth paying for, and what stops it returning.

• Musty Smell Coming From a Crawl Space

  Why the smell reaches the living space, how to narrow down whether it is mold, moisture, plumbing or rodents, and the order of fixes that actually removes it.

• Closed vs Vented Crawl Spaces: What Oregon Code Requires

  Why crawl space vents can add moisture rather than remove it, exactly what Oregon code requires to seal one, and the radon exception that applies across the Portland metro.

• How Long Does Crawl Space Encapsulation Last?

  Encapsulation is several components with different service lives. What each realistically gives you, what ends a system early, how to read the warranty — and a transparent model of the 10- and 15-year cost to own.

• Water in Your Crawl Space After Rain: Causes and Fixes

  Why Portland crawl spaces fill with water after rain, where it comes from, and the drainage, sump pump, and waterproofing fixes that keep it dry.

• Energy Trust of Oregon Crawlspace Rebates: 2026 Amounts and Eligibility

  The current 2026 Energy Trust incentive amounts for crawlspace floor and rim joist insulation, who qualifies, and how to avoid losing the rebate.

• Vapor Barrier vs Encapsulation: Which Does Your Crawl Space Need?

  An honest comparison of vapor barriers and full encapsulation for Portland homes, including what each actually fixes and when the cheaper option is the right one.

• Is Crawl Space Encapsulation Worth It in Oregon?

  A realistic look at encapsulation ROI in the Willamette Valley climate: energy savings, comfort, moisture control, resale, and when it is not worth the money.

• Portland Crawl Space Maintenance Checklist

  A seasonal inspection checklist for Portland-area homeowners, including what to check before the rains start and the warning signs worth acting on.

• Rodents in a Portland Crawl Space

  The order that decides whether the money works, the Oregon vent-code limit that stops rats but not mice, the free Multnomah County inspection, and how to clean up without aerosolizing it.

• Crawl Space Problems Found During a Home Inspection

  What the crawl space findings in an Oregon inspection report do and do not establish, why an observation is not a diagnosis, and the order to work through before anyone quotes a price.

• Buying a House With Crawl Space Water, Mold or Moisture in Oregon

  How to work out what a crawl space finding might cost you before the due diligence window closes: what to establish, what to ask, and how to compare two contractor opinions that disagree.

• FHA and VA Crawl Space Requirements

  What HUD Handbook 4000.1 and VA Pamphlet 26-7 actually say about crawl spaces, quoted from the handbooks — including why the 18-inch figure everyone repeats is conditional, and why VA states no number at all.

• Should You Repair Crawl Space Problems Before Selling an Oregon Home?

  Repairing and disclosing are two separate questions. The four stages between knowing there is a problem and having it fixed, what each one costs and buys you, and what Oregon disclosure law actually says.

• Why Your Floors Are Cold Over a Crawl Space

  How to tell whether cold floors are insulation, ducts, air leakage or the hatch — and the Oregon code table that governs a retrofit, which is not the one most bids quote from.

• Standing Water in a Crawl Space: What It Means

  Water that is not tied to a specific storm usually means the water table, not the roof. What causes it, how serious it is, and how to fix it.

• Flooded Crawl Space: What to Do Before You Go In

  An ordered response for a crawl space with water in it right now — the safety check before entry, getting the water out, what to throw away, and what to photograph.

• Does Homeowners Insurance Cover Crawl Space Repair?

  What Oregon and Washington insurance regulators say homeowner policies exclude under a house, what flood insurance pays for in a crawl space, and what to document before a claim.

• Sump Pump Running Constantly: What It Means

  Cycling more in winter is normal. A pump that never shuts off, or short-cycles every few seconds, is a different situation - what each pattern means.

• High Humidity in a Crawl Space: Causes, Readings, and Fixes

  A humid crawl space or condensation on ducts and pipes usually shows up before mold does. What counts as too high, what causes it, and how to fix the source.

• Do You Need a Crawl Space Dehumidifier?

  When a crawl space needs one and when it does not, what Oregon and Washington code say, how to size it, and what it costs to install and to run at Portland-area electricity prices.

• Sagging or Bouncy Floors Over a Crawl Space

  A floor that gives underfoot usually means one of two things - degraded insulation or wood decay - and they call for very different fixes. How to tell which you have.

• Efflorescence in a Crawl Space: What the White Deposits Mean

  White, chalky deposits on a foundation wall are efflorescence, not mold - a sign water has moved through the masonry. What it means and when to act on it.

• Wood Rot in a Crawl Space: How Serious Is It?

  What decay actually is, why "dry rot" is a misleading name, how it differs from mold, and how to tell whether a finding under your house is structural or cosmetic.

• Crawl Space Work You Can Do Yourself, and What to Hire Out

  Job by job: what an Oregon or Clark County homeowner can legally and sensibly do under their own house, where self-installed work usually fails, and the licensing, permit and rebate rules that decide it.