• 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

R408.3 Unvented Crawl Space

Residential Code 2018 of Kansas > 4 Foundations > R408 Under-Floor Space > R408.3 Unvented Crawl Space
JUMP TO FULL CODE CHAPTER
ILLUSTRATION
Ventilation openings in under-floor spaces specified in Sections R408.1 and R408.2 shall not be required where the following items are provided:
  1. Exposed earth is covered with a continuous Class I vapor retarder. Joints of the vapor retarder shall overlap by 6 inches (152 mm) and shall be sealed or taped. The edges of the vapor retarder shall extend not less than 6 inches (152 mm) up the stem wall and shall be attached and sealed to the stem wall or insulation.
  2. One of the following is provided for the under-floor space:
    1. 2.1. Continuously operated mechanical exhaust ventilation at a rate equal to 1 cubic foot per minute (0.47 L/s) for each 50 square feet (4.7 m2) of crawl space floor area, including an air pathway to the common area (such as a duct or transfer grille), and perimeter walls insulated in accordance with Section N1102.2.11 of this code.
    2. 2.2. Conditioned air supply sized to deliver at a rate equal to 1 cubic foot per minute (0.47 L/s) for each 50 square feet (4.7 m2) of under-floor area, including a return air pathway to the common area (such as a duct or transfer grille), and perimeter walls insulated in accordance with Section N1102.2.11 of this code.
    3. 2.3. Plenum in existing structures complying with Section M1601.5, if under-floor space is used as a plenum.
    4. 2.4. Dehumidification sized to provide 70 pints (33 liters) of moisture removal per day for every 1,000 square feet (93 m2) of crawl space floor area.

Related Code Sections


R408.3 Foundations, Unvented Crawl Space
equal to 1 cubic foot per minute (0.47 L/s) for each 50 square feet (4.7 m 2 ) of crawl space floor area, including an air pathway to the common ...
Residential Code 2018 of Kansas > 4 Foundations > R408 Under-Floor Space > R408.3 Unvented Crawl Space
M1601.5.1 Duct Systems, General
Exception: Plumbing waste cleanouts shall be permitted to be located in unvented crawl spaces that receive conditioned air in accordance with Section ...
Residential Code 2018 of Kansas > 16 Duct Systems > M1601 Duct Construction > M1601.5 Under-Floor Plenums > M1601.5.1 General
R402.2.11 [RE] Residential Energy Efficiency, Crawl Space Walls
and then vertically or horizontally for not less than an additional 24 inches (610 mm). Exposed earth in unvented crawl space foundations shall ...
Energy Conservation Code 2018 of Kansas > 4 [RE] Residential Energy Efficiency > R402 Building Thermal Envelope > R402.2 Specific Insulation Requirements (Prescriptive) > R402.2.11 Crawl Space Walls
N1102.2.11 [RE] Energy Efficiency, (R402.2.11) Crawl Space Walls
and then vertically or horizontally for not less than an additional 24 inches (610 mm). Exposed earth in unvented crawl space foundations shall ...
Residential Code 2018 of Kansas > 11 [RE] Energy Efficiency > N1102 (R402) Building Thermal Envelope > N1102.2 (R402.2) Specific Insulation Requirements (Prescriptive) > N1102.2.11 (R402.2.11) Crawl Space Walls
N1102.4 [RE] Energy Efficiency, (R402.4) Air Leakage (Mandatory)
; and extending from the bottom to the top of all perimeter floor framing members. Crawl space walls Exposed earth in unvented crawl spaces shall ...
Residential Code 2018 of Kansas > 11 [RE] Energy Efficiency > N1102 (R402) Building Thermal Envelope > N1102.4 (R402.4) Air Leakage (Mandatory)
Help Contact Us Privacy Terms
Code diagrams
Code diagrams
Unpack the code through illustrations and descriptions.
Code Calculators
Code Calculators
Code calculators automatically generate a detailed list of requirements.
Shared projects
Shared projects
Projects provide a dedicated space to collaborate on code research.
Code sheet exports
Code sheet exports
Generate a code sheet that integrates with your drawing set.
Code Compare
Code Compare
Highlight differences between any two building codes.
Search
Search
Don't miss relevant code. Quickly locate sections across your jurisdiction.
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