Moisture control is very important for the proper functioning of the building. This helps to protect occupants from adverse health effects. Moisture causes problems for building owners, maintenance personnel and occupants. It is mainly caused due to poor design, construction and maintenance. These issues can be rectified by the techniques that are based on understanding of how water behaves in buildings.
CALGreen Code Section 5.505.1: Indoor moisture control.
Buildings shall meet or exceed the provisions of the California Building Code, CCR, Title 24, Part 2, Sections 1202 (Ventilation) and Chapter 14 (Exterior Walls). For additional measures, see Section 5.407.2 of this code.
Intent:
The intent is to direct the code user to other parts of Title 24, in addition to these provisions, intended to reduce the probability of mold and mildew growth, improving air quality for occupants. California Building Code Section 1202 for attic spaces and underfloor ventilation, Chapter 14 for a weather-resistant exterior wall envelope and Section 5.407.2.2, “Entries and openings,” in this code.
Enforcement:
Plan intake: The plan reviewer should confirm in the construction documents that moisture control and venting features meet Title 24 and are specified and detailed.
On-site enforcement: The inspector should verify that moisture control and venting measures have been incorporated into the building per the construction documents.
Compliance Method:
Include details on the construction documents that address moisture control and ventilation. Understand and install moisture control according to construction documents and manufacturer’s installation recommendations.
Note: Vapor control recommendations for different climate zones may be found at www.buildingscience.com.
(Excerpted from ‘Guide to the 2019 California Green Building Standards Code Nonresidential’ – Chapter 5)
California Green Building Code (CALGreen) – Indoor moisture control
Moisture control is very important for the proper functioning of the building. This helps to protect occupants from adverse health effects. Moisture causes problems for building owners, maintenance personnel and occupants. It is mainly caused due to poor design, construction and maintenance. These issues can be rectified by the techniques that are based on understanding of how water behaves in buildings.
CALGreen Code Section 5.505.1: Indoor moisture control.
Buildings shall meet or exceed the provisions of the California Building Code, CCR, Title 24, Part 2, Sections 1202 (Ventilation) and Chapter 14 (Exterior Walls). For additional measures, see Section 5.407.2 of this code.
Intent:
The intent is to direct the code user to other parts of Title 24, in addition to these provisions, intended to reduce the probability of mold and mildew growth, improving air quality for occupants. California Building Code Section 1202 for attic spaces and underfloor ventilation, Chapter 14 for a weather-resistant exterior wall envelope and Section 5.407.2.2, “Entries and openings,” in this code.
Enforcement:
Plan intake: The plan reviewer should confirm in the construction documents that moisture control and venting features meet Title 24 and are specified and detailed.
On-site enforcement: The inspector should verify that moisture control and venting measures have been incorporated into the building per the construction documents.
Compliance Method:
Include details on the construction documents that address moisture control and ventilation. Understand and install moisture control according to construction documents and manufacturer’s installation recommendations.
Note: Vapor control recommendations for different climate zones may be found at www.buildingscience.com.
(Excerpted from ‘Guide to the 2019 California Green Building Standards Code Nonresidential’ – Chapter 5)
