Sheet Waterproofing 101
Sheet waterproofing provides a continuous moisture barrier around rooftop and wall penetrations used by smoke control systems. Ensuring this barrier helps prevent water intrusion that could compromise dampers, electrical cabinets, and other smoke control systems (제연설비) components. Choosing the right sheet membrane requires compatibility with ventilation ducts and long term exposure to sun and rain. In practice, installers lay out waterproofing to align with the smoke control system routing and necessary flashings.
Membrane types vary from simple sheets to reinforced polymer layers with protective facings. Adjacent joint details, such as corners and transitions around ducts, demand careful seam sealing to avoid water paths. Some membranes include self-sealing edges or quick-fastening options that help field adjustments. Quality control relies on water column tests and air pressure tests to confirm no breakthrough at penetrations.
Codes and performance data influence material choice, especially where smoke control systems are present. Material selection should reference local standards and factory ratings for fire resistance and weather exposure. During design reviews, engineers verify that the sheet waterproofing details do not obstruct dampers or air paths. A well-integrated detail reduces maintenance calls and preserves system reliability.
Duct Penetration Seals
Duct penetration seals are critical where smoke control systems pass through building envelopes. Penetrations must accommodate thermal movement without tearing the waterproof layer. Fire rated sleeves, intumescent wraps, and gasketed closures help maintain both water barriers and fire separation. The goal is a seamless intersection where dampers, sleeves, and membranes meet without gaps.
Installers apply sealants that resist aging and respond to temperature change. Intumescent sealants expand under heat to maintain blockage against smoke while preserving waterproofing. Where metal ducts contact concrete, backer boards and flashing strips prevent water tracking. Field testing with water jets and air pressure confirms tightness around the joints.
Regular inspections of seals around smoke control systems (제연설비) components reduce leakage risk. After heavy rainfall or seismic events, resealing around penetrations is often required. Documentation includes as-built drawings showing assembly layers and test results. A proactive approach minimizes repair costs and extends the life of the system.
Roof and Wall Install
Rooftop and wall installations must consider corrosion resistance where smoke control ducts emerge. Stainless hood and stainless steel ductwork are common choices in kitchens and service areas. Water barriers should continue across flashings, curbs, and edges to protect the smoke control system (제연설비). Alignment between the waterproofing layer and the flashing detail prevents leaks at the interface.
Flashing details use compatible sealants and pre-formed corners to minimize gaps. Leaks often travel along fastener lines, so sealant beads must cover screw paths and joint overlaps. Slope toward drainage paths directs water away from penetrations and dampers. Periodic inspection during seasons with heavy rainfall keeps the envelope reliable.
Maintenance plans for roof and wall assemblies include checklists for membranes around vents. Owners should track service life of membranes and gaskets near smoke control components. Replacement cycles depend on climate, UV exposure, and mechanical stress from wind. A robust plan reduces moisture intrusion into control rooms and air intakes of smoke control systems (제연설비).