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Wet Insulation

Insulation is one of the most important utility items in a home as it helps control temperature. When moisture enters your crawl space, it can cause insulation to become wet. This makes it easier for temperatures to fluctuate around your home.

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Have you noticed energy bills rising in your home? Maybe certain rooms feel too cold or too warm. You may be dealing with wet insulation, and it’s likely caused by too much moisture in your crawl space. Dry Pro has the expertise to protect your crawl space from this issue, so let’s dive into how this happens in the first place. 

What Causes Wet Insulation? 

Wet insulation occurs as a result of too much moisture in your crawl space, Moisture can enter your crawl space in a few different ways which we’ll outline here.

soil washout and erosion

Soil Washout

When a heavy storm rolls through, the rain can displace the soil on your property. Water erodes soil particles and causes the ground to become muddy. At the same time, water also absorbs into the soil and the groundwater travels below your crawl space. Eventually, the groundwater evaporates from the soil and becomes trapped within the crawl space. This leads to humid air mixing with the cool air of your crawl space. When cold and hot air occupy the same area, condensation forms on the insulation located in your crawl space. Without the proper crawl space protection, this cycle continues and keeps your insulation wet.  

open crawl space vent

Open Crawl Space Vents

Back in the day, contractors believed that crawl spaces could avoid rising humidity if they were built with open vents. The idea was that trapped humid air would be able to escape through these vents and allow the crawl space to stay naturally cool. However, this turned out to be completely wrong – and it continues to affect homeowners to this day. Open vents actually cause the opposite to happen. Whatever the air is like outside, your crawl space will emulate it. High humidity outside leads to high humidity within your crawl space. As the humid air travels below your home, it causes water droplets to form on insulation and once again your home is left with faulty temperature control.  

Faulty Vapor Barrier

Some crafty homeowners might install a DIY vapor barrier below their crawl space. Unfortunately, this process is ill-advised, as vapor barrier installation requires precise measurements and specialized tools that many homeowners simply don’t have. Any misstep during the process undoes all the effort of installing the vapor barrier in the first place, costing you time and money. Eventually, water penetrates the crawl space and damages the vapor barrier as well as surrounding structures such as wooden beams. Insulation inevitably becomes damaged as a result. Vapor barrier installation should only be handled by trained professionals with the tools and expertise required for the job. 


Wet insulation causes more problems than simply paying for repairs. It also leads to temperature control issues in your home. First, this can lead to high energy bills as your HVAC is forced to work harder since the insulation no longer offers proper protection. Secondly, water may leak from the insulation onto wooden structures in your crawl space. This can lead to wood rot, which causes your floors to sag and become uneven. As you can see, wet insulation can lead to a domino effect of other problem signs throughout your home and crawl space.  

Potentially. However, a larger concern is how wet insulation can lead to mold growth in your crawl space. When water drips from your wet insulation, it creates the perfect setting for mold to spread. Mold feeds on decaying organic matter such as wet and rotting wooden beams in your crawl space. Over time, mold releases its spores into the air, and these can travel into your house. Spores may cause health issues or aggravated allergies. They will also cause mold to grow in other places around your home such as closets or near pipes.  

The crawl space is important for one very simple reason: it contains many of your home’s most important structures and systems. This includes your HVAC system, electrical wiring, plumbing, insulation, your floor’s support beams, and your foundation. None of these items does well when moisture enters the area. Unfortunately, crawl spaces are extremely susceptible to water damage since they’re exposed to the outside and located close to the ground. Keeping it protected with various crawl space solutions is important and keeps your home safe from damage. 

Call Dry Pro for Your Crawl Space Needs 

Insulation helps keep your home functioning properly. Don’t let an unprotected crawl space cause your home to suffer or force you to spend more money on bills or repairs – Dry Pro has the tools and expertise to help our clients in Charlotte and Hickory, and we’re ready to help you too. Contact us today to learn even more about crawl space problem signs and solutions. When you call, we’ll be able to set up a free inspection with one of our specialists to address your individual needs! 

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