• 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

R806.2 Minimum Vent Area

Residential Code 2021 of Colorado > 8 Roof-Ceiling Construction > R806 Roof Ventilation > R806.2 Minimum Vent Area
JUMP TO FULL CODE CHAPTER
The minimum net free ventilating area shall be 1/150 of the area of the vented space.
Exception: The minimum net free ventilation area shall be 1/300 of the vented space provided both of the following conditions are met:
  1. In Climate Zones 6, 7 and 8, a Class I or II vapor retarder is installed on the warm-in-winter side of the ceiling.
  2. Not less than 40 percent and not more than 50 percent of the required ventilating area is provided by ventilators located in the upper portion of the attic or rafter space. Upper ventilators shall be located not more than 3 feet (914 mm) below the ridge or highest point of the space, measured vertically. The balance of the required ventilation provided shall be located in the bottom one-third of the attic space. Where the location of wall or roof framing members conflicts with the installation of upper ventilators, installation more than 3 feet (914 mm) below the ridge or highest point of the space shall be permitted.

Related Code Sections


R806.2 Roof-Ceiling Construction, Minimum Vent Area
The minimum net free ventilating area shall be 1 / 150 of the area of the vented space. Exception: The minimum net free ventilation area shall ...
Residential Code 2021 of Colorado > 8 Roof-Ceiling Construction > R806 Roof Ventilation > R806.2 Minimum Vent Area
504.1 Chimneys and Vents, Definitions
The following definitions apply to the tables in this section. APPLIANCE CATEGORIZED VENT DIAMETER/AREA . The minimum vent area/diameter ...
Fuel Gas Code 2018 of Colorado > 5 Chimneys and Vents > 504 (IFGS) Sizing of Category I Appliance Venting Systems > 504.1 Definitions
G2428.1 Fuel Gas, (504.1) Definitions
The following definitions apply to the tables in this section: APPLIANCE CATEGORIZED VENT DIAMETER/AREA. The minimum vent area/diameter ...
Residential Code 2021 of Colorado > 24 Fuel Gas > G2428 (504) Sizing of Category I Appliance Venting Systems > G2428.1 (504.1) Definitions
G2428.1 Fuel Gas, (504.1) Definitions
The following definitions apply to the tables in this section. APPLIANCE CATEGORIZED VENT DIAMETER/AREA. The minimum vent area/diameter ...
Residential Code 2018 of Colorado > 24 Fuel Gas > G2428 (504) Sizing of Category I Appliance Venting Systems > G2428.1 (504.1) Definitions
319.7.5.1 General Requirements, Normal Vents
Normal vents shall be located above the maximum normal liquid line, and shall have a minimum effective area not smaller than the largest filling ...
Fire Code 2021 of Colorado > 3 General Requirements > 319 Mobile Food Preparation Vehicles > 319.7 Cooking Oil Storage Tanks > 319.7.5 Tank Venting > 319.7.5.1 Normal Vents
Help Contact Us Privacy Terms
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.
Shared projects
Shared projects
Projects provide a dedicated space to collaborate on code research.
Search
Search
Don't miss relevant code. Quickly locate sections across your jurisdiction.
Code diagrams
Code diagrams
Unpack the code through illustrations and descriptions.
Code Calculators
Code Calculators
Code calculators automatically generate a detailed list of requirements.
UpCodes Premium
Leverage the most sophisticated code compliance platform.
TRY FREE FOR TWO WEEKS VISIT PRICING
UpCodes Premium
Leverage the full code compliance platform.
START 2 WEEK FREE TRIAL PRICING