Material for sealing vertical shaft cable trays

Sealing vertical shaft cable trays involves preparing the opening, selecting appropriate firestop or sealing materials, installing backing or modular frames, and applying sealants to ensure a tight, compliant, and maintainable closure. Step 1: Prepare the Shaft OpeningEnsure that the floor and wall finishes are completed and that shaft doors are installed. Remove any debris and verify that the cable tray is properly positioned and supported.

For large openings, consider installing a fire-resistant backing plate to provide a stable base for the sealant or modular system ( ). Step 2: Select Appropriate Sealing MaterialsChoose materials based on the hazards and environment: Fire-rated materials: firestop boards, firestop packs, or mineral wool for fire protection ( ). Weatherproof or chemical-resistant materials: silicone-based sealants, water-resistant pads, or modular frames for outdoor or wet environments ( ).

Modular sealing systems: such as Roxtec frames, which allow for future cable additions or changes without compromising the seal ( ). Step 3: Install Backing or Modular FramesFor modular systems, insert the frame into the shaft opening. Frames can be cast, bolted, or welded depending on the construction type.

Ensure the frame encompasses the entire cable tray at the penetration point and is level and square ( ). Step 4: Pack and Seal Around CablesPlace firestop packs or sealing modules around the cables in an orderly sequence. Ensure that gaps between cables and packs do not exceed 1 cm² and that the packing thickness meets minimum requirements (typically ≥24 cm for fire-rated applications) ( ).

Apply sealant (e.g., silicone-based or NOFIRNO®) to fill any remaining voids, both internally and externally, ensuring a continuous, crack-free seal ( ). Step 5: Install Cover PlatesAttach cover plates to close the opening. Plates should be square, consistent in size, and evenly painted if required.

This step ensures mechanical protection and aesthetic uniformity ( ). Step 6: Verify and MaintainInspect the seal for tightness, absence of cracks, and proper alignment. Ensure that the installation complies with fire, safety, and environmental standards.

Plan for future cable additions or maintenance by using modular or removable sealing systems ( ). By following these steps, vertical shaft cable trays can be safely sealed, providing fire protection, environmental resistance, and flexibility for future modifications.