Quick Answer
To maintain a dry interior, container conversion owners must seal all openings, ensure proper ventilation, and install a reliable roof and wall moisture barrier.
Sealing Openings and Insulation
Sealing openings is crucial to prevent moisture intrusion. Use a silicone-based sealant to fill gaps between the container’s steel panels, and install weatherstripping around doors and windows. Consider adding insulation to the roof and walls, using materials like spray foam (R-10 per inch) or fiberglass batts (R-3.8 per inch). When cutting openings for windows and doors, install a weather-resistant flashing to direct water away from the opening.
Foundation and Drainage
A proper foundation is essential to prevent moisture accumulation beneath the container. A concrete slab or a gravel base can help direct water away from the container. Ensure the foundation is sloped to allow for proper drainage, with a minimum slope of 1% (1 foot of fall per 100 feet of length). Consider installing a French drain to collect and redirect water.
Roof and Wall Moisture Barrier
A reliable roof and wall moisture barrier is critical to preventing moisture intrusion. Install a 30-mil or thicker polyethylene sheeting on the roof and walls to prevent water vapor from entering the container. Ensure the sheeting is securely fastened to the container’s steel frame using screws or rivets. When installing the roof, consider adding a secondary waterproofing layer, such as a 10-mil polyurethane coating, to the interior of the roof decking.
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