Firestop sealing requirements for hotel pipe shafts and cable shafts
I am fire protection expert Alexander Li. Firestop sealing of pipe shafts and cable shafts is a critical element of building fire safety, especially in high-occupancy premises such as hotels, where improper sealing can turn these shafts into vertical pathways for smoke and flame spread during a fire, directly threatening life and property safety. In multiple hotel fire acceptance inspections and renovation projects, I have repeatedly found major hazards caused by sealing omissions, so compliance with the codes must be strictly enforced.
According to Article 6.2.9 of the Code for Fire Protection Design of Buildings (GB 50016-2014, 2018 edition), pipe shafts and cable shafts shall be separated at each floor slab with non-combustible materials or firestop materials having a fire resistance rating not lower than that of the floor slab (typically 1.50 h or 2.00 h). Specifically:
- **Vertical sealing**: Where pipe shafts and cable shafts penetrate floor slabs, they must be tightly sealed with firestop compounds (such as firestop putty, firestop pillows, or firestop boards). Where the gap width exceeds 50 mm, firestop boards shall be used together with firestop sealant. In the acceptance inspection of a five-star hotel, I once found that the cable shaft at the 18th floor slab was simply filled with cement mortar without dedicated firestop materials, resulting in insufficient fire resistance. It was subsequently rectified in accordance with the code by re-sealing with firestop pillows and firestop boards of 2-hour fire resistance rating, and passed the fire inspection.
- **Horizontal sealing**: Where pipes or cables penetrate fire compartment partition walls (such as the walls between hotel guest rooms and corridors), referring to Article 6.2.6 of GB 50016, firestop assemblies must be used, including firestop boards, flexible intumescent compounds, or firestop sealant, and after sealing the original fire resistance rating of the wall (typically not less than 1.00 h) must be maintained. For example, in a hotel renovation project, wall penetration openings for the ELV and power shafts were not sealed, causing smoke to spread rapidly to adjacent guest rooms during a fire simulation test; we subsequently sealed them with firestop putty combined with firestop pillows and added a fireproof coating to ensure tightness.
- **Special requirements**: For fire protection cables in hotels (such as fire alarm and fire pump control lines), reference shall be made to Article 11.2.3 of the Code for Design of Automatic Fire Alarm Systems (GB 50116-2013); the openings after conduit protection shall be sealed with Class A firestop materials, with a sealing thickness of not less than 100 mm. I once dealt with a case of false alarms in a hotel fire alarm system caused by ELV and power cables being mixed in the cable shaft without sealing, resulting in electromagnetic interference. During rectification, we separated the ELV and power cables in accordance with the code, partitioned them with firestop boards, and then sealed the entire shaft.
**Practical engineering case**: At a five-star resort hotel in a coastal city, during the pre-opening fire acceptance inspection, it was found that where the water supply pipe and smoke exhaust duct penetrated the floor slab in the 15th floor pipe shaft, no sealing had been done at all—only foam filling was used. In accordance with Article 6.2.9 of GB 50016, we required the contractor to remove the foam, replace it with firestop pillows and firestop sealant of 2-hour fire resistance rating applied in layers, and wrap fire blankets around the pipes. At the same time, all openings in the cable shaft (including spare openings) were checked and sealed one by one. After rectification, the fire inspection showed that smoke could not spread through the shaft, and the acceptance passed.
**Summary**: Firestop sealing of hotel pipe shafts and cable shafts must achieve "separation at every floor, compliant materials, and tight sealing," with particular attention to ELV/power separation and fire protection cable protection. During construction, ordinary cement or foam must not be used in place of dedicated firestop materials, and the effectiveness must be verified through on-site fire resistance testing.
The above are reference opinions. The actual project conditions still need to be comprehensively evaluated and implemented in combination with specific operating conditions, site conditions, and other factors.