Quick Answer
A root cellar should be sealed against moisture using a combination of waterproof materials, including a vapor barrier, a waterproof coating, and a well-draining foundation system.
Waterproofing Techniques
To create a waterproof seal for a root cellar, start by ensuring the foundation is well-draining and sloped to direct water away from the structure. A minimum 6-inch foundation depth is recommended to prevent water from seeping through the soil. Apply a waterproof coating, such as a polyurethane-based sealant, to the foundation and walls, allowing it to dry completely before proceeding.
Vapor Barrier Installation
Install a 6-mil or thicker vapor barrier, such as a plastic sheet liner, along the walls and ceiling of the root cellar. Ensure the vapor barrier is sealed at all seams and joints using a waterproof adhesive or tape. This will prevent moisture from entering the cellar through the walls and ceiling.
Additional Measures
To further protect the root cellar from moisture, install a French drain system around the perimeter of the structure, using a minimum 3-inch diameter pipe to direct water away from the cellar. Additionally, consider installing a roof-mounted gutter system to divert rainwater away from the structure. Regularly inspect the root cellar’s seal for any signs of damage or wear, and address any issues promptly to maintain a dry and healthy storage environment.
Find more answers
Browse the full Q&A library by topic, or jump back to the topic this question belongs to.