Quick Answer
Waterproofing a bermed home can be a significant challenge due to the unique design where the roof is built into the earth, creating a potential for water intrusion.
Designing for Waterproofing
Bermed homes require careful consideration of waterproofing from the start of the design phase. This involves selecting materials with high resistance to water and designing a drainage system that directs water away from the structure. A slope of at least 1:1 (45 degrees) is recommended for the roof to ensure water runs off. Consider using a 6-mil thick, cross-linked polyethylene (XLPE) sheeting as the primary waterproofing layer. This type of sheeting is highly durable and resistant to UV degradation.
Installation and Sealing Techniques
During installation, it’s essential to ensure that all seams and joints are properly sealed using a high-quality, 100% solids, two-part polyurethane sealant. Apply a bead of sealant to the seam, then press the adjacent sheet into place, ensuring a tight seal. Use a heat gun to remove air pockets and ensure a strong bond. Additionally, consider applying a 2-inch thick, high-density, spray-applied closed-cell foam to the roof surface for added insulation and waterproofing. This foam should be applied in accordance with the manufacturer’s instructions.
Regular Maintenance and Inspection
Regular inspections are crucial to identifying potential waterproofing issues before they become major problems. Inspect the roof for signs of damage, such as cracks in the waterproofing layer, uplifted seams, or water stains. Make repairs promptly, addressing any issues that could compromise the integrity of the waterproofing system. Consider scheduling annual inspections with a qualified professional to ensure the waterproofing system remains effective and functional.
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