- Published: September 15, 2025
Nico Barbieri
Nico was the first person hired for the position of estimator and project manager for our growing company. He has over 25 years of experience in the water proofing industry. More About Nico
Protect Your Home’s Coolest Space From Moisture Damage
Cold storage rooms—also known as fruit cellars or cantinas—are a great feature in many Ontario homes. Built partially or fully underground with minimal ventilation and concrete walls, these spaces are designed to stay cool and dry for storing preserves, vegetables, wine, and pantry items.
But when your cold room starts to leak or feel damp, it can lead to mold, musty odors, or even structural damage. At Aquatech Waterproofing, we’ve helped hundreds of homeowners deal with this exact issue. Here’s how to identify the problem, address it properly, and keep your cold storage safe and dry.
1. Understand Why Cold Rooms Leak
Cold rooms are vulnerable to moisture for several reasons:
- Poor ventilation: Without proper airflow, condensation builds up on cold concrete surfaces.
- Cracks in concrete walls or ceiling: Small cracks allow water intrusion from surrounding soil.
- Ineffective waterproofing: Many cold rooms lack exterior membranes or interior drainage systems.
- Thermal bridging: Temperature differences between the interior and exterior can cause water to condense.
- Inadequate insulation: If the ceiling (typically under a porch) isn’t insulated or waterproofed, rain and snowmelt can leak in.
2. Signs of a Leaky Cold Room
Here’s what to look out for:
- Damp or musty smell
- Water stains on ceiling or walls
- Visible cracks or efflorescence (white powdery residue)
- Peeling paint or rusted shelving
- Mold growth on concrete or stored items
- Pooling water or wet floor after rain or snowmelt
Ignoring these signs can lead to worsening mold issues, damage to stored items, or even health risks from poor air quality.
3. Step-by-Step: How to Handle It
Step 1: Remove Items and Dry the Area
Take everything out and use fans or a dehumidifier to dry the space. Don’t store anything back until the issue is fully resolved.
Step 2: Inspect for Cracks and Entry Points
Look for visible cracks in walls, ceiling, or around the doorframe. Water often enters through these structural weak points.
Step 3: Seal Cracks and Joints
Use hydraulic cement or epoxy injection to seal cracks—but note that this is often a temporary solution if deeper water intrusion is present.
Step 4: Improve Ventilation
Install a vent or small fan to increase airflow and reduce humidity buildup. Consider adding a vapor barrier if needed.
Step 5: Call Aquatech for Permanent Waterproofing Solutions
DIY fixes can help temporarily—but long-term protection requires professional intervention. Aquatech offers:
- Exterior waterproofing under porch slabs
- Interior membrane and drainage system installation
- Cold room ceiling insulation and vapor barrier sealing
- Crack injection and permanent foundation sealing
4. Preventing Future Leaks
Once repaired, keep your cold storage room dry by:
- Sealing around porch slabs and steps
- Avoiding storage of cardboard or fabric items that attract mold
- Using plastic shelves and containers for airflow and moisture resistance
- Regularly inspecting for new leaks or condensation
- Installing a dehumidifier if the space remains humid
Pro Tips: Safe Storage Alternatives
- Keep valuables—like documents and heirlooms—in climate-controlled indoor areas or plastic, airtight containers.
- If storage in the basement is unavoidable, elevate items off the floor, use moisture-resistant bins, and inspect them regularly.
Final Thoughts
A leaky cold storage room isn’t just inconvenient—it’s a sign that moisture is entering where it shouldn’t. Addressing it early protects your food, your foundation, and your family’s health.
Aquatech Waterproofing specializes in basement and cold room leak solutions across the Greater Toronto Area. With over 25 years of experience, we’ll help you seal, insulate, and safeguard your space—permanently.
