Installing urban outdoor furniture on membrane rooftops requires careful planning to maintain structural integrity and waterproofing. The primary consideration involves protecting the delicate roofing membrane from punctures, tears, and excessive weight concentration. Furniture should never be placed directly on the membrane surface without appropriate protective measures.
Implement protective barriers between furniture legs and the membrane using durable materials like high-density polyethene pads or composite panels. These distribute weight evenly and prevent direct contact. Consider the total weight load, including furniture, occupants, and potential snow accumulation, ensuring it falls within the roof's engineered capacity.
Select furniture with broad, flat bases rather than narrow legs to minimize point loading. Lighter materials like aluminium or HDPE lumber reduce stress on the roof structure. Maintain adequate clearance around rooftop equipment and ensure furniture placement doesn't obstruct drainage paths or access points.
Regular inspections for membrane damage beneath furniture are crucial. Consider professional consultation for comprehensive installations, as improper furniture placement can void roofing warranties and lead to costly leaks and structural damage.