Skip to Main Content

Your Guide to Relative Humidity

measuring the moisture in a crawl space

In a previous article, we tackled the question, “How to Dry Out a Crawl Space and Manage Humidity Levels?

Now, we’re going to take a step back and answer, “What is relative humidity?”

The answer is straightforward, so let’s dive right in.

What Is Relative Humidity?

Relative humidity measures the amount of moisture in the air compared to the maximum amount the air can hold at a given temperature.

It’s expressed as a percentage; for example, if the relative humidity is 50%, the air is holding half of the moisture it can at that temperature. Warmer air can hold more moisture than cooler air, so relative humidity changes with temperature fluctuations. Understanding relative humidity is important because high levels can lead to problems like mold growth, condensation, and wood rot, especially in areas like basements and crawl spaces.

How to Measure Relative Humidity and Protect Your Home

measuring the humidity against the basement wall

Measuring relative humidity in your home is easy with a hygrometer, a small device that reads the moisture level in the air. Hygrometers are inexpensive and can be placed in areas like basements, crawl spaces, or living rooms to monitor humidity levels.

High humidity can negatively affect your home by promoting mold and mildew growth, damaging walls, ceilings, and floors, and posing health risks.

Excess moisture can also cause wood to warp or rot, damage insulation, and create an environment that attracts pests like termites. Keeping an eye on relative humidity helps you take action before these issues escalate.

Understanding Relative Humidity & Its Impact on Your Home

In this post, we answered the question, “What is relative humidity?” We explained that relative humidity measures the moisture in the air compared to its maximum capacity at a given temperature. High humidity can lead to problems like mold, mildew, wood rot, and pest infestations, so keeping an eye on humidity levels is crucial for maintaining a healthy home.

There’s much more to learn about humidity’s impact on your home. In our next article, we’ll dive into the differences between wood rot and mold.

If you need basement or crawl space waterproofing, Foundation Recovery Systems offers a quick, easy, and completely FREE inspection—just click the button below to get started!

FAQs

The cost varies based on the size and condition of your crawl space, as well as necessary repairs. Foundation Recovery Systems offers free inspections, no-obligation quotes, and financing options to accommodate your budget.

Keeping humidity levels within 40-60% is crucial to prevent mold growth. For expert guidance on maintaining such levels, reach out to Foundation Recovery Systems.

A humidity range of 40 to 50 percent is optimal. Lower levels can cause uncomfortable dry air, while higher levels promote mold growth and other moisture issues. A professionally installed crawl space dehumidifier, combined with waterproofing and encapsulation methods, is essential. Contact Foundation Recovery Systems for a free inspection and estimate. 

Related Resources

Award-Winning Service

  • 5/
  • 5/
  • 5/
  • 5/
  • 5/
Review Logo

Corey was honest. Drove 2 hours and gave a thorough inspection. And determinedthat we do not need foundation repair. And took the time to …

Corey was honest. Drove 2 hours and gave a thorough inspection. And determinedthat we do not need foundation repair. And took the time to explain the best options for our situation.

  • 5/
  • 5/
  • 5/
  • 5/
  • 5/
Review Logo

Nick Gunther came today for our annual inspection. He was very professional and polite and did a good job checking our speedy channel. …

Nick Gunther came today for our annual inspection. He was very professional and polite and did a good job checking our speedy channel. He is an asset to your company. Linda Carter

  • 5/
  • 5/
  • 5/
  • 5/
  • 5/
Review Logo

I do not typically write reviews but I have to say I could not be more pleased with the exceptional service I received from the Foundation…

I do not typically write reviews but I have to say I could not be more pleased with the exceptional service I received from the Foundation Recovery Team in Lees Summit. Shayne, Dakota, Landon and Tyler were outstanding! They thoughtfully guided us through every step of the process and ensured we understood what was going to happen to ease our nerves. It is scary having your entire house lifted, and they were so knowledgable and transparent that I felt confident leaving my house while the work was being done. They were on-time, considerate and trustworthy. Our house is back to level, the big gaps between our foundation and doors are closed, and our floor is now level. I am thrilled with the work they did and will sleep well at night knowing our homes foundation is fixed!

  • 5/
  • 5/
  • 5/
  • 5/
  • 5/
Review Logo

The Foundation Recovery team did a great job in my basement. Trenton M, Matthew B, and Kinkade D were all very professional. The team lead, …

The Foundation Recovery team did a great job in my basement. Trenton M, Matthew B, and Kinkade D were all very professional. The team lead, Trenton, kept me informed throughout the construction and installation and took time to explain how the system would work as well as gave details about each step of the process and patiently answered all my questions. I highly recommend their service.

  • 5/
  • 5/
  • 5/
  • 5/
  • 5/
Review Logo

Came on time. Very professional and courteous. Did not leave a mess. Was meticulous about making sure my sidewalk sections were level….

Came on time. Very professional and courteous. Did not leave a mess. Was meticulous about making sure my sidewalk sections were level. Did a great job sealing each sidewalk section. Thank you Todd and Randy

  • 5/
  • 5/
  • 5/
  • 5/
  • 5/
Review Logo

Nic came out and gave a thorough inspection, communicated everything to resolve our issues. Highly recommend for professionalism and…

Nic came out and gave a thorough inspection, communicated everything to resolve our issues. Highly recommend for professionalism and communication

  • 5/
  • 5/
  • 5/
  • 5/
  • 5/
Review Logo

Chris was great to work with for my inspection and estimate. Look forward to getting work done on my crawlspace.

Chris was great to work with for my inspection and estimate. Look forward to getting work done on my crawlspace.

  • 5/
  • 5/
  • 5/
  • 5/
  • 5/
Review Logo

Shae was very helpful and thorough! I'm very thankful.

Shae was very helpful and thorough! I'm very thankful.

  • 5/
  • 5/
  • 5/
  • 5/
  • 5/
Review Logo

From the folks I spoke with in the office to Jeremy H. who came out to do the inspection to the crew who did the work, everyone was…

From the folks I spoke with in the office to Jeremy H. who came out to do the inspection to the crew who did the work, everyone was friendly and professional. I received several emails and texts leading up to the appointments, preparing me for what to expect, as well as phone calls the mornings of the work to let me know the crew was on their way and when they'd arrive. After the inspection, I was given options about the repairs, and it was all clearly explained. A few weeks after the inspection, I had several piers installed around my foundation. For two days, Brandon C., Dylan E., and Darrion R. worked so hard and communicated in a clear and friendly manner with me as I pestered them with questions. FRS really made repairing my foundation as painless a process as possible. I would absolutely recommend them to anyone.

  • 5/
  • 5/
  • 5/
  • 5/
  • 5/
Review Logo

Stabilized footings. Austin, Tanner, snd Alex performed the job well, professionally, and timely

Stabilized footings. Austin, Tanner, snd Alex performed the job well, professionally, and timely

  • 5/
  • 5/
  • 5/
  • 5/
  • 5/
Review Logo

I had MAJOR work done by FRS. Two 1000+ square-foot crawlspaces required full drainage systems, support structuring, wood replacement, and…

I had MAJOR work done by FRS. Two 1000+ square-foot crawlspaces required full drainage systems, support structuring, wood replacement, and encapsulation. Also had foam injections into very large pool patio to level concrete as well as installing channel drain into said patio. Just thought I'd get that out there to give context to below review.Prompt response to request for information, detailed quotes and analysis, fair and easy financing, they show up and they communicate throughout, they inform you of additional things that come up on the job you may want to address, and if you are concerned about it their crews speak your language and can deal directly with you. Also affordable maintenance plans to ensure their system stays in top shape or to address any unlikely issues. FRS was definitely not the least expensive option, but after dealing with many contractors they were worth every penny for the aforementioned reasons. Time will tell if I need to use any warranties and how they handle that agreement; but after looking at the work product I don't think I will have to.

  • 5/
  • 5/
  • 5/
  • 5/
  • 5/
Review Logo

We are an animal rescue and have been in our building for 6.5 yrs. We knew we needed concrete repair and we reached out to Foundation…

We are an animal rescue and have been in our building for 6.5 yrs. We knew we needed concrete repair and we reached out to Foundation Recovery Systems for their help. Patrick Turrieta was great to work with, was very knowledgeable and explained everything well. If you are in need of your concrete lifted, repaired, and warrantied, then Patrick is the guy to ask for and no one else will do. Todd and his crew that did the work were very easy to work with, on time, good clean up and it looks great. We highly recommend them.

Foster Pet Outreach

  • 5/
  • 5/
  • 5/
  • 5/
  • 5/
Review Logo

We’ve used foundation repair system with repairs on 3/4 of our foundation walls.Just had Dalton Campbell out to inspect the system. and…

We’ve used foundation repair system with repairs on 3/4 of our foundation walls.Just had Dalton Campbell out to inspect the system. and we’ll be hiring them to repair the 4th.Every time we’ve used them they have been professional and completed high quality work. The walls they have repaired are stabilized and have remained stabilized.

  • 5/
  • 5/
  • 5/
  • 5/
  • 5/
Review Logo

Recently we had Foundation Recovery Systems come out and do some work in our basement. The guys did an amazing job! Our basement looks…

Recently we had Foundation Recovery Systems come out and do some work in our basement. The guys did an amazing job! Our basement looks fantastic and not a drop of water has come in since! Chris, Cliff and Zion were the crew that came out and they were professional, quick and extremely easy to work with. They took care to pick-up the construction mess and their communication was fantastic. The project even got done faster than expected. I appreciate the work they put in and would 100% recommend them to anyone.

  • 5/
  • 5/
  • 5/
  • 5/
  • 5/
Review Logo

Great experience using Foundation Recovery Systems. Highly recommend. Ken was very detailed with the initial walkthrough and was able to…

Great experience using Foundation Recovery Systems. Highly recommend. Ken was very detailed with the initial walkthrough and was able to determine the leaking issue in my basement. After the sump pump installation the room was very well cleaned and the team even tarped off part of the basement to ensure no dust got on our appliances. Tyler, Isaiah, and Jake did an amazing job. Thanks all!

  • 5/
  • 5/
  • 5/
  • 5/
  • 5/
Review Logo

Mason H and Tyler S did a fantastic job for me. They kept me informed during the whole process!

Mason H and Tyler S did a fantastic job for me. They kept me informed during the whole process!

  • 5/
  • 5/
  • 5/
  • 5/
  • 5/
Review Logo

Nick Mata came out today to complete an inspection for us and was very thorough. He listened to our concerns, took multiple measurements…

Nick Mata came out today to complete an inspection for us and was very thorough. He listened to our concerns, took multiple measurements and photos and crawled under our house to determine what we needed to have done to our crawl space. He walked me through the existing issues and made sure I understood everything he was showing me. He then went over costs and what all was included in the price. He went over financing options and gave us all the options. He did a great job and was very professional.

  • 5/
  • 5/
  • 5/
  • 5/
  • 5/
Review Logo

Foundation Recovery Systems installed 11 helical piers on the sinking addition to our house. First, our inspector/estimator, Tanner, was…

Foundation Recovery Systems installed 11 helical piers on the sinking addition to our house. First, our inspector/estimator, Tanner, was very informative, listened well to our concerns, and was easy to communicate with. After work was completed, Tanner followed up with a phone call to make sure we were pleased with the crew's work. Our crew foreman, Jon, and the rest of the crew were very professional and very hard working. Jon communicated with me clearly about what they were doing and why each step of the way. He also kept me informed of obstacles they encountered and how they were solving them. The crew accidentally damaged some window trim and an exterior door threshold, but Jon told me immediately about it and the company has reimbursed us every penny for repairs. The crew completed their work and we are so happy we hired FRS!

  • 5/
  • 5/
  • 5/
  • 5/
  • 5/
Review Logo

Foundation Revovery Systems has reached out and is assisting me with my issues. It was quick to act on my concerns, so I've adjusted this…

Foundation Revovery Systems has reached out and is assisting me with my issues. It was quick to act on my concerns, so I've adjusted this and will adjust reflect more positively if things are remedied as indicated.***UPDATE: The company has gone above and beyond to remedy the situation. I would recommend this company.****PROS:>> Company itself is responsive (but not always its employees, such as the salesman)>> Quick scheduling (but they did delay a work or so, but they refunded me $100 after asking)>> Did installation correctly to my knowledge (but grading outside house should have been mentioned before offering the $6,000 fix)>> Individuals working the project (and those who followed up) were pleasant

  • 5/
  • 5/
  • 5/
  • 5/
  • 5/
Review Logo

Devon and Terrence came out and worked hard and fixed everything that was wrong. Would recommend this crew to anyone. Very satisfied now!

Devon and Terrence came out and worked hard and fixed everything that was wrong. Would recommend this crew to anyone. Very satisfied now!

Leah Leitow

Leah Leitow

Content Writer

Leah is a Content Writer for Groundworks with nearly ten years of experience working in the foundation repair industry. Her experience ranges from working with homeowners to find the right solution to training inspectors and staff. In her background as a Michigan journalist, she gained invaluable insight into people's lives throughout our state. Leah lives in metro Detroit with her husband and two sons.

Publish Date:

Last Modified Date:

FRS service area

Our Locations

Cedar Rapids

3349 Southgate Ct SW,
Cedar Rapids, IA 52404
(319) 220-5034

Central Illinois

14678 E 925 North Rd, Building 5
Bloomington, IL 61705

Des Moines

2401 SE Creekview Dr.
Ankeny, IA 50021
(515) 373-8491

Kansas City

7280 NW 87th Terrace, Suite C-210
Kansas City, MO 64153
(816) 774-1539

Lee's Summit

211 SE State Route 150
Lee's Summit, MO 64082
(816) 774-1539

Moberly

1872 State Hwy M
Moberly, MO 65270
(660) 202-8662

Springfield

3020 N. Martin Ave.
Springfield, MO 65803
(417) 612-8286

St. Louis

1625 Larkin Williams rd.
Fenton, MO 63026
(314) 207-9995