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Flooded Garage Cleanup: Step-by-Step Guide

Fix water-damaged boxes in your garage with expert tips on repairs, causes, and prevention strategies.

Reviewed by Content Team

Head of Content, D. Gorenko

Updated June, 5

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How to Fix Water-damaged boxes in garage

 
Immediate Safety and Assessment
 

  • Carefully inspect the water-damaged boxes and surrounding area. If water is still present or dripping, stop the source immediately by shutting off the water supply if it’s connected to plumbing.
  • Wear protective gloves, a mask, and safety goggles to avoid contact with mold or contaminated materials.
  • Ensure there is no risk of electrical shock by turning off power to any nearby outlets or electrical devices if water is nearby.

 
Tools and Materials Needed
 

  • Protective gear (gloves, mask, eye protection)
  • Dehumidifier or fans to dry the area
  • Cleaning supplies (mild detergent, sponge/cloth)
  • Plastic sheeting or tarps to protect unaffected areas
  • Trash bags or containers for disposing damaged materials
  • Mold cleaning solution (if mold is present)
  • Replacement boxes or storage containers if needed

 
Step-by-Step Repair Process
 

  • Carefully remove damaged items from the boxes. If some are salvageable, gently clean and dry them; otherwise, dispose of items that are beyond repair.
  • Open up the boxes to allow them to air out. Use fans or a dehumidifier to speed up the drying process. If the box material is swollen or soft due to water damage, consider replacing them.
  • If mold growth is present, clean the boxes with a solution of water and a small amount of detergent. For persistent mold, scrub with a specialized mold cleaner while wearing the necessary protective equipment.
  • Place the cleaned items and boxes in a dry, well-ventilated area. Consider using moisture absorbers to prevent future issues.

 
Homeowner vs. Professional
 

  • If the damage is limited to a few boxes and the rest of the garage is dry, a careful homeowner can handle cleaning and drying processes using the guidelines mentioned.
  • However, if water damage is extensive, has seeped into walls, or if there is significant mold contamination, it is best to call a professional restoration expert. This prevents further damage and ensures thorough cleaning.
  • For water damage, a specialist in water restoration or a general contractor experienced in water repair is most often the right choice. They can assess structural damage and advise if further remediation is needed, such as hiring an electrician to check outlet wiring or a plumber if water leaks continue.

 
Additional Safety and Insurance Tips
 

  • Always document damaged areas with photos before cleaning. This is useful for insurance claims if you have coverage for water damage.
  • If your insurance requires an adjuster’s visit, keep a record of all repairs and any professional services you use. This documentation is crucial in claiming costs.
  • Be cautious of any structural changes. If the water damage appears to have weakened the structure of your garage or if you notice electrical issues, refrain from DIY repairs and call a professional immediately.

 
Local Context
 

  • If you are located in St. Louis or Nashville, you have access to full-service residential and commercial repair professionals who can help assess and restore water-damaged areas promptly.

What Could be Causing Water-damaged boxes in garage

 

Structural and Environmental Causes

 

Water-damaged boxes in a garage can result from various structural weaknesses and environmental conditions. One common cause is water infiltration through the roof or walls. Over time, broken or damaged roofing materials, missing seals, or improperly installed flashing can allow rainwater to seep into the structure. Moisture may then travel along surfaces and settle into boxes that are stored near the edges of the building.

  • Damaged roofing or wall seals permit water to enter during heavy rain.
  • Poorly installed flashing around windows and doors can act as a pathway for water.
  • Structural gaps where different building materials meet may be vulnerable to leaks.

 

Condensation and Humidity Build-up

 

Garages often experience temperature fluctuations that lead to condensation. When warm, humid air interacts with cold surfaces, moisture forms. This can dampen nearby items, including storage boxes, even without any direct exposure to rain. Poor ventilation exacerbates the issue, allowing moisture to accumulate over time.

  • Rapid temperature changes encourage condensation on cool surfaces.
  • A lack of proper air circulation traps humid air within the garage.
  • Boxes stored against cold walls might experience more condensation.

 

Plumbing and Foundation Leaks

 

In some cases, the source of moisture is not the rain at all but rather leaks from plumbing or even rising groundwater. If the garage is attached to a home or close to underground water lines, slow leaks can gradually saturate stored boxes. Additionally, water can seep upward from the foundation if moisture is pooling around the base of the structure.

  • Hidden plumbing issues or leaks from nearby water lines may saturate storage areas.
  • Water that accumulates at the foundation level can penetrate into the garage space.
  • Improper grading around the building might allow water to collect near the foundation.

 

External Weather Conditions

 

Severe weather and external environmental factors also play a significant role in causing water damage. Heavy downpours, flash floods, and even wind-driven rain can force water into areas that would normally remain dry. In regions such as St. Louis and Nashville, these conditions are not unusual, and improper protection or maintenance may leave storage areas vulnerable to unexpected moisture.

  • Heavy rainfall can overwhelm drainage systems, increasing the risk of water flowing into the garage.
  • Storms and wind-driven rain may push water through any small openings or cracks.
  • Lack of proper gutters and downspouts can result in water pooling near the building.

 

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