• 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 General Contractor Building Official & Plans Examiner Inspectors Owner Subcontractors 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
Suggested code sections
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

R702.7.1 Class III Vapor Retarders

Residential Code 2015 of Utah > 7 Wall Covering > R702 Interior Covering > R702.7 Vapor Retarders > R702.7.1 Class III Vapor Retarders
JUMP TO FULL CODE CHAPTER
Class III vapor retarders shall be permitted where any one of the conditions in Table R702.7.1 is met.

TABLE R702.7.1
CLASS III VAPOR RETARDERS
CLIMATE
ZONE
CLASS III VAPOR RETARDERS PERMITTED FOR:a
Marine
4
Vented cladding over wood structural panels.
Vented cladding over fiberboard.
Vented cladding over gypsum.
Continuous insulation with R-value ≥ 2.5 over 2 × 4 wall.
Continuous insulation with R-value ≥ 3.75 over 2 × 6 wall.
5 Vented cladding over wood structural panels.
Vented cladding over fiberboard.
Vented cladding over gypsum.
Continuous insulation with R-value ≥ 5 over 2 × 4 wall.
Continuous insulation with R-value ≥ 7.5 over 2 × 6 wall.
6 Vented cladding over fiberboard.
Vented cladding over gypsum.
Continuous insulation with R-value ≥ 7.5 over 2 × 4 wall.
Continuous insulation with R-value ≥ 11.25 over 2 × 6 wall.
7 and 8 Continuous insulation with R-value ≥ 10 over 2 × 4 wall.
Continuous insulation with R-value ≥ 15 over 2 × 6 wall.

For SI: 1 pound per cubic foot = 16 kg/m3.
  1. Spray foam with a maximum permeance of 1.5 perms at the installed thickness, applied to the interior cavity side of wood structural panels, fiberboard, insulating sheathing or gypsum is deemed to meet the continuous insulation requirement where the spray foam R-value meets or exceeds the specified continuous insulation R-value.

Related Code Sections


1404.3.2 Exterior Walls, Class III Vapor Retarders
Class III vapor retarders shall be permitted where any one of the conditions in Table 1404.3.2 is met. Only Class III vapor retarders shall be used ...
Building Code 2018 of Utah > 14 Exterior Walls > 1404 Installation of Wall Coverings > 1404.3 Vapor Retarders > 1404.3.2 Class III Vapor Retarders
1405.3.2 Exterior Walls, Class III Vapor Retarders
Class III vapor retarders shall be permitted where any one of the conditions in Table 1405.3.2 is met. Only Class III vapor retarders shall be used ...
Building Code 2015 of Utah > 14 Exterior Walls > 1405 Installation of Wall Coverings > 1405.3 Vapor Retarders > 1405.3.2 Class III Vapor Retarders
R702.7.1 Wall Covering, Class III Vapor Retarders
Class III vapor retarders shall be permitted where any one of the conditions in Table R702.7.1 is met. TABLE R702.7.1 CLASS III VAPOR RETARDERS ...
Residential Code 2015 of Utah > 7 Wall Covering > R702 Interior Covering > R702.7 Vapor Retarders > R702.7.1 Class III Vapor Retarders
Section 1405 Exterior Walls, Installation of Wall Coverings
wall. Construction where moisture or its freezing will not damage the materials. Conditions where Class III vapor retarders are required ...
Building Code 2015 of Utah > 14 Exterior Walls > 1405 Installation of Wall Coverings
Section 1404 Exterior Walls, Installation of Wall Coverings
freezing will not damage the materials. Conditions where Class III vapor retarders are required in Section 1404.3.2 ...
Building Code 2018 of Utah > 14 Exterior Walls > 1404 Installation of Wall Coverings
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 Calculators
Code Calculators
Code calculators automatically generate a detailed list of requirements.
Code diagrams
Code diagrams
Unpack the code through illustrations and descriptions.
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 LEARN MORE