(815) 735-5586

<< View All Posts

The Essential Crawl Space Inspection Guide: Save Your Home Thousands

Read time: 6 min.
crawl space inspection

For many homeowners, the crawl space is a mysterious and often neglected area of their home. But ignoring this space can lead to serious problems like water damage, mold growth, and pest infestations. A crawl space inspection is an essential part of home maintenance and can save you thousands of dollars in costly repairs down the road.

I know what you’re thinking – who wants to crawl around in a dark, dusty space? I get it. But a crawl space inspection doesn’t have to be scary. This is your home we’re talking about. In fact, understanding what to look for can make it a manageable task and give you valuable insight into the health of your foundation. It’s like a check-up for your house.

Table Of Contents:

Why a Crawl Space Inspection Is Important

It can uncover several potential issues that, if left unaddressed, can escalate into bigger headaches.

Water Damage

Crawl spaces are notorious for moisture problems because they often lack proper ventilation and drainage. Signs of water damage in your crawl space can include:

  • Standing water or puddles
  • Water stains on walls or floor joists
  • Musty odor
  • Efflorescence (white powdery substance on concrete or brick)
  • Condensation on pipes or ductwork

Excess water can lead to structural damage, wood rot, and create the perfect breeding ground for mold. This also lowers energy efficiency due to the cold air seeping in from the crawl space.

Mold Growth

Mold loves dark, damp environments. Excessive moisture in your crawl space is a prime invitation for mold growth. Mold not only causes structural damage but can also cause serious respiratory health problems, especially for those with allergies or asthma. You may notice a musty smell or even visible mold growth on wood surfaces or insulation. The longer the mold grows untreated, the harder and more expensive it will be to fix, and trust me, you don’t want to let this get out of hand.

Pest Infestations

A warm, damp crawl space is a cozy home for all kinds of unwanted critters – rodents, insects, and even snakes. And the Pacific Northwest, especially, has an abundance of moisture. As the folks at Crawl Pros note, “two rats can multiply to over a thousand in a single year,” leading to droppings, gnaw marks, foul odor, greasy marks along the walls, and damage to insulation. Rats will chew through anything, from wood and drywall to wiring and pipes. It is best to hire a professional for pest control or rodent exclusion in these situations.

Structural Damage

Your crawl space supports the entire weight of your house, so you can imagine how important it is to make sure everything is sound. The last thing you need is a damaged crawl space. Signs of structural damage may include cracks in foundation walls, sagging floors, or bowing walls. This is definitely a situation where you’ll need professional help. The inspector will evaluate everything from foundation cracks and broken floor joists to inadequate insulation and unsealed crawl space doors. Trust me, foundation problems can quickly spiral into a money pit if left unaddressed.

DIY or Professional Crawl Space Inspection?

 You may be tempted to DIY your crawl space inspection, but some situations call for professional expertise. Consider your level of knowledge about foundations, experience, and comfort navigating confined spaces. The best time to schedule an inspection is in the spring or fall when weather is milder.

When a Professional Inspection Makes Sense

Hiring a professional inspector is beneficial because they know the ins and outs of home structures and are equipped to detect subtle signs of trouble. Also, as with all experts, years of practice make them highly skilled at diagnosing issues. Consider getting a professional crawl space inspection if you notice signs of serious water damage, mold growth, pest infestation, or structural damage.

Forbes gives some scenarios for hiring a professional inspector, including “selling your home, buying a home, [or] constructing a new foundation.” An inspection can ease buyers’ worries.

DIY Inspections

For more routine checks or to gain some initial insights, you can perform a basic DIY inspection. Just use common sense precautions when entering crawl spaces: wear protective gear like gloves and a mask, have a strong flashlight, and be extra careful if you suspect moisture. The longer you wait to inspect, the more expensive problems become to fix. Pay close attention to ventilation, moisture levels, pest activity, and signs of mold or water damage. It’s like preventative maintenance for your car. But even with regular inspections, if you have limited experience with crawl space issues, having a professional provide their opinion is valuable. You want to make sure you don’t miss a significant problem.

Crawl Space Inspections: Essential Checklist

A thorough inspection, whether conducted by a pro or you, will assess every aspect of your crawlspace and identify problem areas needing attention.

Crawl Space Inspection Checklist Table

Item What to Look For
**Foundation Walls** Look for: cracks, efflorescence, bowing, settling, shifting, holes or gaps.
**Beams, Support Posts** Signs of sagging, cracking, splitting, damage, or inadequate support. Verify proper alignment and connection with beams.
**Floor Joists, Subflooring** Inspect for: warping, damage, water stains, insect infestation signs (droppings, frass). Check subflooring connections for integrity.
**Vapor Barrier** Evaluate for: tears, holes, gaps, proper coverage. Vapor barriers play a vital role in preventing moisture buildup.
**Insulation** Assess type, condition, and coverage. Poor insulation can affect temperature, energy efficiency, and moisture control. Look for water damage and mold.
**Ventilation** Ensure vents are working correctly. Obstructions like debris or insect nests need addressing to prevent moisture and promote air circulation.
**Drainage** Identify water accumulation areas and whether drains and sump pumps function correctly. Properly draining water is crucial for avoiding foundation issues and moisture problems.
**Pests, Rodents** Droppings, nests, tracks, gnawed wires or pipes are signs of pest activity, calling for appropriate measures. You may need rodent exclusion.
**Mold, Mildew** A musty odor is a sign, but look for black, gray, or white spots on walls, floor, and framing members. You’ll need to call in a professional for mold remediation.

Additional Things To Look For

  • Properly sealed and secured crawl space door
  • Intact foundation vent covers without holes (mice like to chew them)
  • Electrical wiring, HVAC ducts, and plumbing for signs of damage
  • Presence of radon – A certified radon professional can evaluate this.

Maintaining a Healthy Crawl Space

You did it – you completed your crawl space inspection. Now you need to take steps to fix what’s broken and prevent issues from recurring. This can include improving ventilation by installing proper vents, a vapor barrier, and adding a dehumidifier for moisture control. Encapsulation involves lining walls and the floor with a heavy-duty plastic vapor barrier to create a seal against moisture intrusion and keep your crawlspace dry. Another option is installing a French drain system. The best way to approach maintenance, though, is by contacting a crawl space expert like the team at Crawl Pros to discuss solutions specific to your house.

FAQs About Crawl Space Inspections

FAQ 1: How do you inspect your crawl space?

Start with the foundation walls, checking for cracks and signs of moisture damage. Assess the beams and floor joists, looking for structural integrity. Pay attention to ventilation, insulation, vapor barriers, and the presence of any pests or mold. Remember, if you’re dealing with more complex problems, it’s always a good idea to call a professional inspector. It’s your home, and taking preventative action early can save you a lot of headaches down the road.

FAQ 2: Who checks the crawl space?

Homeowners can conduct basic DIY crawl space inspections. You can look for obvious problems, but professionals specializing in home inspections and foundations can give a more comprehensive analysis. They know how to look for those more subtle issues that an untrained eye might miss.

FAQ 3: How often should a crawl space be inspected?

It’s generally a good idea to check your crawl space at least once a year, but ideally twice. This allows you to spot potential issues before they escalate into bigger problems. It’s especially important to inspect after heavy rains or floods. After all, an ounce of prevention is worth a pound of cure, right?

FAQ 4: How often do you need to clean your crawl space?

Once a year should be enough. If you have an encapsulation system or adequate vapor barriers and proper ventilation in place, it could even go a bit longer. The key here is to look for signs of pest infestations, debris, and water accumulation. Addressing these issues will help maintain a healthy crawlspace and prevent damage to your foundation.


A crawl space inspection is crucial for keeping your home healthy, safe, and structurally sound. Don’t let your crawlspace be an out-of-sight, out-of-mind problem. Stay proactive with those inspections – even if you only tackle a few DIY inspections each year, you can stay one step ahead of the game and catch those potential issues early on.

Allied Water Services Logo
  • Address

8086 N 2000E Road, Ste 6
Manteno, Illinois 60950

  • Hours

Mon - Fri 7:00 am – 05:00 pm
Sat - Sun By Appointment

  • Call Us

Call us for a free estimate
(815) 735-5586

© 2024 
Allied Water Services