3.1901.3 Chase Ways (e.g., Service Spaces Containing Pipes, Wires, Ducts, and/or Structural Components; Includes Dumbwaiters and Trash Chutes)

Multifamily Compartmentalization Techniques
Desired Outcome: 
Control of one or more of the following: building air leakage, stack effect, noise transmission, or improved indoor air quality
For supporting material, see Referenced Standards.

Conduct pre-inspection in accordance with SWS 2.0100.4 Work Area Inspection and Stabilization

Gaps, cracks, and holes in fire separations located within the work area will be visually identified and incorporated into air sealing work scope, including those that span two conditioned or unconditioned spaces

Where drawings are available that identify specific fire-resistance ratings (i.e., 1 hour, 2 hour), materials and methods will be employed to preserve or restore such rating

Where drawings are unavailable or do not identify specific fire-resistance ratings, the fire-resistance rating of the assembly may be inferred from the current construction (i.e., single 5/8 sheetrock, concrete masonry unit), and materials and methods employed will be consistent with restoring or preserving such inferred fire-resistance rating

Repairs necessary to stabilize work areas and protect or preserve integrity of energy improvement will be completed before subject work begins

Provide a safe and stable work environment

Repair moisture and structure-related issues

Identification of penetrations

Penetrations will be identified using visual inspections, infrared thermography, smoke, and/or pressure tests ( ASTM ASTM ASTM International, www.astm.org E1186-03 [2009])

Access will be provided to ensure that repairs can be made (may include localized demolition)

Attempts will be made to secure existing building drawings and specifications relating to affected areas to aid in diagnostics and minimize temporary demolition

Fire-resistant integrity of existing shafts that span multiple fire separations will be maintained during testing and construction periods

Locate air leakage pathways to repair

Provide system-wide air flow control benefits

Ensure that breeches of fire-separated spaces are not left unattended during the construction cycle


Health and safety concerns for occupants and workers, in relation to repairs and materials, will be addressed in accordance with OSHA OSHA U.S. Occupational Safety and Health Administration, www.osha.gov standards ( OSHA OSHA U.S. Occupational Safety and Health Administration, www.osha.gov 1926, 1910)

The area will be prepared and isolated in accordance with health and safety standards for the application and materials (e.g., extreme temperatures, lead, asbestos)

Work lighting, work platform, and adequate ventilation will be provided

Provide a safe work environment

Provide safe indoor environmental quality (IEQ) in the work environment

Provide effective repair access

Installation, sealant, and materials selection

Sealants and materials will be compatible with their intended surfaces and applied in accordance with manufacturer specifications

Selection will be durable, pest resistant, and have a weather-appropriate seal

Indoor sealants will be low volatile organic compound ( VOC VOC Volatile organic compound ) products that meet independent testing and verification protocols, such as Green Seal GS-36, "GREENGUARD Children and Schools," or comparable certifications

Fire-resistance-rated assemblies will be provided with sealants permitted by the authority having jurisdiction and adopted building code

Prevent intrusion of moisture and pests into the sealed assembly

Prevent exposing workers or occupants to excessive VOC VOC Volatile organic compound levels

Ensure sealant meets or exceeds the performance characteristics of the assembly and is compliant with local fire code requirements

Demolition repair

Access holes will be repaired

Both temporary (during construction) and permanent demolition repairs will preserve the fire-resistance ratings of affected assemblies

Restore surfaces to original condition or better


Repairs will be verified by visual inspections, infrared thermography, smoke, and/or pressure tests consistent with the pre-inspection

Ensure quality and effectiveness of air sealing