• Codes
  • Features

    Features Overview

    Go to features
    Reference

    Reference.

    A reliable and up-to-date source of codes.
    Research

    Research.

    Rapidly and efficiently calculate project parameters.
    Collaboration

    Collaboration.

    Get everyone on the same page and streamline code research.
    Workflows
    Architects
    Architects
    General Contractors
    General Contractors
    Building Official & Plans Examiners
    Building Official & Plans Examiners
    Inspectors
    Inspectors
    Owners
    Owners
    Subcontractors
    Subcontractors
    Code Consultants
    Code Consultants
  • Pricing
  • Login
  • Sign Up
Sign Up
Login
  • Code Library
  • Features
  • Pricing
  • About
  • Careers
  • Help
  • Contact
  • Terms
  • Privacy
Sign Up
Upgrade to Premium
Code calculators: Code Calculators automatically generates a detailed list of requirements.
REFERENCE
Amendment Styling
Industry-leading search
Code diagrams
RESEARCH
Code calculators
Filter by topic
Code compare
Code sheet exports
COLLABORATION
Team projects
Bookmarks
Comments
START 2 WEEK FREE TRIAL
Have an account? Sign in
// CODE SNIPPET

722.4.1.3 Multiwythe Walls With Airspace

Building Code 2018 of Illinois > 7 Fire and Smoke Protection Features > 722 Calculated Fire Resistance > 722.4 Clay Brick and Tile Masonry > 722.4.1 Masonry Walls > 722.4.1.3 Multiwythe Walls With Airspace
JUMP TO FULL CODE CHAPTER
Where a continuous airspace separates multiple wythes of the wall or partition, the total fire-resistance rating shall be determined by the formula:
(Equation 7-10)
where:
R = The fire-resistance rating of the assembly (hours).
R1, R2 and Rn = The fire-resistance rating of the individual wythes (hours).
as = Coefficient for continuous airspace.
Values for Rn0.59 for use in Equation 7-10 are given in Table 722.4.1(3). The coefficient for each continuous airspace of 1/2 inch to 31/2 inches (12.7 to 89 mm) separating two individual wythes shall be 0.3.

Related Code Sections


722.4.1.3 Fire and Smoke Protection Features, Multiwythe Walls With Airspace
Where a continuous airspace separates multiple wythes of the wall or partition, the total fire-resistance rating shall be determined by the formula ...
Building Code 2018 of Illinois > 7 Fire and Smoke Protection Features > 722 Calculated Fire Resistance > 722.4 Clay Brick and Tile Masonry > 722.4.1 Masonry Walls > 722.4.1.3 Multiwythe Walls With Airspace
722.4.1.3 Fire and Smoke Protection Features, Multiwythe Walls With Airspace
Where a continuous airspace separates multiple wythes of the wall or partition, the total fire-resistance rating shall be determined ...
Building Code 2021 of Illinois > 7 Fire and Smoke Protection Features > 722 Calculated Fire Resistance > 722.4 Clay Brick and Tile Masonry > 722.4.1 Masonry Walls > 722.4.1.3 Multiwythe Walls With Airspace
722.4.2 Fire and Smoke Protection Features, Multiwythe Walls
The fire-resistance rating for walls or partitions consisting of two or more dissimilar wythes shall be permitted to be determined by the formula ...
Building Code 2021 of Illinois > 7 Fire and Smoke Protection Features > 722 Calculated Fire Resistance > 722.4 Clay Brick and Tile Masonry > 722.4.2 Multiwythe Walls
C402.2.7 [CE] Commercial Energy Efficiency, Airspaces
resistance of airspaces located on the exterior side of the continuous air barrier and adjacent to and behind the exterior wall-covering material shall ...
2018 Illinois Energy Conservation Code Standards for Privately Funded Commercial Facilities and Standards for Residential Buildings > 4 [CE] Commercial Energy Efficiency > C402 Building Envelope Requirements > C402.2 Specific Building Thermal Envelope Insulation Requirements (Prescriptive) > C402.2.7 Airspaces
722.4.2.1 Fire and Smoke Protection Features, Multiwythe Walls of Different Material
For walls that consist of two or more wythes of different materials (concrete or concrete masonry units ) in combination with clay masonry units ...
Building Code 2021 of Illinois > 7 Fire and Smoke Protection Features > 722 Calculated Fire Resistance > 722.4 Clay Brick and Tile Masonry > 722.4.2 Multiwythe Walls > 722.4.2.1 Multiwythe Walls of Different Material
Help Contact Us Privacy Terms
Search
Search
Don't miss relevant code. Quickly locate sections across your jurisdiction.
Shared projects
Shared projects
Projects provide a dedicated space to collaborate on code research.
Code Calculators
Code Calculators
Code calculators automatically generate a detailed list of requirements.
Code Compare
Code Compare
Highlight differences between any two building codes.
Code sheet exports
Code sheet exports
Generate a code sheet that integrates with your drawing set.
Code diagrams
Code diagrams
Unpack the code through illustrations and descriptions.
UpCodes Premium
Leverage the most sophisticated code compliance platform.
VISIT PRICING
UpCodes Premium
Leverage the full code compliance platform.
START 2 WEEK FREE TRIAL PRICING