A garage filled with water

How to Stop Damp and Mould in the Garage?

Key Takeaways

Identification of Damp and Mould Issues: Common signs include wet patches, leaks, cracks, musty odours, and flaky plaster. Issues may occur behind tiles or cabinets, making identification challenging. Removal and Prevention Techniques:
  • Humidity Management: Use dehumidifiers or moisture absorbers and maintain a regular cleaning routine.
  • Insulation: Increase thermal efficiency with insulation on walls, floors, and ceilings.
  • Ventilation Enhancement: Install vents or windows strategically to facilitate moisture escape.
  • Gap Sealing: Use mould-resistant sealants to cover gaps; apply moisture-resistant paint afterwards.
  • Strategic Storage: Elevate items with shelf units or pallets; use sealed plastic containers for stored objects.
Causes of Damp and Mould:
  • Rising Damp: Moisture rises from the ground, promoting both structural moisture and mould growth.
  • High Humidity: Areas with high humidity are more susceptible to condensation and mould.
  • Poor Ventilation: Inefficient ventilation leads to condensation, contributing to damp and mould.
  • Water Leaks: Roof or wall leaks provide a breeding ground for mould colonies.
  • Penetrating Damp: Caused by a loss of waterproofing integrity, often localized.
  • Wide Entrances: Large garage openings increase the risk of water infiltration.
  The presence of damp and mould in the garage is not good. It can cause various issues such as structural damage to the walls, making the floor surface slippery, and might even damage the equipment that touches the surfaces that are affected by damp or mould. The common signs of damp and mould include wet patches, leakage, cracks on walls, musty smells, flaky plaster, etc. So, damp and mould can be identified easily. However, sometimes it occurs behind tiles, cabinets, or other things where it can't be spotted easily. Nonetheless, it is essential to stop the growth of damp and mould in the back garage space or any other region of the house because it has the potential to take things to worse levels. But how can you do that? Let's find out. A dehumidifier being used in a garage to remove damp  

Damp and Mould Removal from Garage

Prevent damp and mould in your garage with these simple tips:

Humidity Management

Use sophisticated equipment, such as high-capacity dehumidifiers or innovative moisture absorbers, to carefully catch and neutralize excess moisture in the garage environment. Concurrently, execute a systematic floor cleaning routine that includes frequent sweeping or mopping to remove any remaining standing water.

Insulative Augmentation

Increase the thermal efficiency of your front garage door by installing insulation on the walls, floors, and ceilings, which will help to maintain a stable interior temperature and reduce the likelihood of moisture collection. Self-adhesive insulation explicitly designed for garage doors is a realistic solution, and it is widely accessible at most DIY stores.

Ventilation Enhancement

Install strategically positioned vents or windows in your garage infrastructure to allow moisture to escape quickly and reduce condensation.

Precise Gap Sealing

Use cutting-edge mould-resistant sealants to precisely cover any visible gaps or fissures in your garage's walls, flooring, and ceiling. After the adhesive has cured, apply an extra coat of moisture-resistant paint for maximum protection.

Strategic Storage Placement

Improve the spatial arrangement of stored items in the damp-prone garage environment by strategically utilizing elevated shelf units or wooden pallets to avoid direct contact with the ground. Cover stored objects in plastic solid containers with hermetically sealed lids to protect and provide an extra degree of protection against ambient moisture intrusion. A garage full of things  

What Exactly Causes Damp and Mould in Garage in the First Place?

Common causes of mould and damp in garages are:

Rising Damp

Rising damp, which appears as noticeable wet patches on lower segments of walls or floors, is caused by moisture rising from the ground. This phenomenon not only increases structural moisture but also acts as a promoter for mould growth.

High Humidity

Homes in high-humidity areas are more prone to moisture and mould. The ambient humidity settling on more excellent surfaces causes condensation, aggravating or preventing mould from growth. A garage potentially having damp and mould issues

Poor Ventilation

Garages without efficient ventilation devices are more prone to condensation, which acts as a catalyst for damp and mould growth. The use of equipment such as drying machines without proper ventilation or insufficient air movement exacerbates the mould problem further, raising humidity levels and creating an ideal habitat for mould development.

Water Leaks

A common cause of moisture in garages is leaks from the roof or walls. These leaks not only cause structural water damage but also provide a breeding environment for mould colonies.

Penetrating Damp

Penetrating damp is a flexible type of damp that can appear anywhere in the garage and is frequently caused by a localized loss of waterproofing integrity. Damaged parts, such as guttering, offer routes for water entry, exacerbating the wet conditions that promote mould growth.

Wide Entrances

Garages have large apertures, built not just for car storage but also to allow water infiltration after heavy rains, increasing the risk of mould growth. Water damage in a garage  

Mould Prevention Advice

Remove any collected standing water immediately and thoroughly dry the damaged area. If the space allows, try using a dehumidifier; nevertheless, if your structure is experiencing rising damp, a ventilator will be worthless. Improve the effectiveness of thresholds and seals to keep garage dry and resist water intrusion, but be cautious about completely closing the garage, as this may worsen the present problem. Create an atmosphere that promotes ventilation, fresh air circulation, and sunshine exposure; consider installing vents or air bricks to encourage these circumstances. When painting, choose materials that are waterproof or mildew-resistant. When examining a painted floor, keep in mind that it may disguise the existence of mould development, so avoid forming quick conclusions based simply on visual impressions. Wet floor in a garage  


Finally, eliminating the presence of moisture and mould in the garage is critical owing to their ability to cause structural damage, produce slippery surfaces, and destroy equipment. Identifying symptoms such as damp spots, leaks, fractures, and musty odours is critical, even if these concerns are hidden under tiles or cabinetry. Preventing the formation of moisture and mould is critical to avoiding compounding these issues. As a result, taking proactive actions is essential for keeping a secure and effective garage area.  

How do you stop mould spores from growing in your garage?

To prevent mould growth in your garage, it's essential to address moisture issues. Start by ensuring proper ventilation through windows or vents to promote air circulation. Identify and repair any leaks or water seepage, and consider using a dehumidifier to reduce overall humidity levels. Regularly clean and declutter the garage, as mould thrives in damp, dark, and undisturbed areas. Additionally, store items in a way that allows air to circulate around them and avoid trapping moisture.

How do you stop your garage from getting damp?

To prevent damp in your garage, focus on moisture control measures. Install a damp-proof membrane or coating on the walls and floor to create a barrier against groundwater or moisture from the surrounding soil. Improve ventilation by adding vents or exhaust fans to enhance air circulation. Address any leaks or water ingress promptly, and consider using waterproof sealants on concrete surfaces. Proper insulation can also help regulate temperature and prevent condensation, contributing to a drier garage environment.

How do you damp-proof a garage?

Damp-proofing a garage involves a combination of preventative measures to keep moisture at bay. Start by inspecting the structure for any cracks or gaps and seal them with appropriate materials. Apply waterproof coatings or membranes to the walls and floor to create a barrier against moisture. Adequate ventilation is crucial, so install vents or fans to promote air circulation. Consider raising the garage floor to prevent water ingress, and inspect the garage roof for leaks or damage that may allow moisture to penetrate.

What absorbs moisture in a garage?

Various moisture-absorbing products can help maintain a dry environment in a garage. Silica gel packets, desiccant bags, or moisture-absorbing crystals can be strategically placed to absorb excess humidity. Additionally, using moisture-absorbing materials like charcoal briquettes or specially designed moisture absorbers can be effective in controlling damp. Regularly inspect and replace these materials as needed to ensure continued moisture absorption and prevention of mould growth.

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Sam Fitzgerald – CSRT Damp Surveyor

Sam Fitzgerald – CSRT Damp Surveyor

Author – CSRT Damp Surveyor
Sam is a highly qualified and seasoned damp surveyor with over ten years of specialised experience. With a strong academic foundation in building surveying and numerous professional certifications, Sam has established himself as an authority in the field of damp diagnosis and remediation.

At Damp Surveyors Ltd, Sam applies his extensive knowledge to help homeowners across the UK address and solve their damp issues effectively. His approach combines cutting-edge techniques with a commitment to honest, client-focused service, ensuring that every survey and recommendation is tailored to the specific needs of the property.

As a thought leader, Sam’s insights into damp prevention and treatment have been featured in industry publications, underscoring his role as a trusted expert dedicated to maintaining the integrity and comfort of your home.

Testing device for measuring dampness in a house


At Damp Surveyors Ltd, we stand out as your premier choice for damp survey services in the UK. Our commitment to excellence and customer satisfaction sets us apart. Here’s why you should choose us:

  • Exclusive 3 Free Quotes: We offer a one-of-a-kind optional service where you not only get our top-notch damp survey but also receive 3 free quotes from vetted local companies, giving you peace of mind by saving you thousands on getting the most competitive quotes, and also time researching and contacting other reputable companies.
  • Knowledge and Experience: We provide unmatched knowledge to every survey we conduct thanks to our team of seasoned professionals and years of industry experience. This guarantees accurate assessments and practical solutions.
  • Nationwide Coverage: Whether you’re in a bustling city or a rural area, our services extend across the UK, making us accessible wherever your property is located. Choose us for nationwide reliability and excellence.

Choose Damp Surveyors Ltd as your reliable partner for all-inclusive survey needs. Our top concerns are the health and safety of your property, and we are committed to providing outcomes you can trust.

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