The cost of sealing cable trays in vertical shafts typically ranges from $50 to $200 per linear foot, depending on the firestop material, cable diameter, and installation complexity.

Factors Affecting Price

1. Type of Firestop Material
   • Intumescent fireproof pillows (e.g., AF BAGS) are commonly used for cable tray penetrations. They are certified for up to EI 240 fire resistance and can seal cables up to 21 mm in diameter with a 120 mm depth .
   • Intumescent caulks (latex or water-based) are more affordable and flexible for irregular gaps but may require more labor for proper installation .
   • Mineral wool or fire-rated boards are used for larger openings or high-density cable trays, often combined with firestop sealants .
2. Cable Tray Size and Shaft Dimensions
   • Larger trays or multiple layers of cables increase the number of pillows or the volume of sealant required.
   • Vertical shafts may require additional support or backing plates to maintain fire resistance, which adds to material and labor costs .
3. Fire Rating Requirements
   • Higher fire ratings (EI 180–240) require thicker or multiple layers of firestop materials, increasing both material and installation costs .
4. Installation Complexity
   • Accessibility in vertical shafts, confined spaces, or high-rise buildings can increase labor costs.
   • Proper sequencing, such as installing backing plates, arranging firestop packs, and sealing gaps to less than 1 cm², is critical for compliance .

Typical Cost Estimates

• Small to medium cable tray penetrations: $50–$100 per linear foot using intumescent pillows or caulk.
• Large or high-density cable trays: $120–$200 per linear foot, especially if mineral wool and multiple firestop layers are required.
• Additional costs: Labor, scaffolding, and inspection fees may add 20–50% to the material cost.

Recommendations

• Measure the cable tray width and shaft dimensions to calculate the number of firestop pillows or volume of sealant needed .
• Choose materials certified under EN 1366-3 or equivalent standards for your region to ensure compliance.
• Consult suppliers for quotes based on your specific shaft configuration, as prices vary by region and supplier. By considering these factors, you can estimate the total cost for sealing cable trays in vertical shafts while ensuring fire safety compliance.