Cellulose Insulation
Cellulose Insulation Manufacturers Association of Canada Logo
Manufacturers Association of Canada
Member Login Contact Us
Français
NATURALLY BETTER INSULATION
RESOURCES
What R-Value
R-Value =
temp diff X area X time

heat loss
Really Means
CIMAC CIMAC Video ChannelChannel
CIMAC Video - Greenest of the Green The Greenest of the Green
CIMAC Video - Cellulose Insulation Soundproofing Demonstration Soundproofing Demonstration
CIMAC Video - Cellulose Insulation Installation Demonstration Installation Demonstration
CIMAC Video - Cellulose Insulation in the Home Cellulose Insulation in the Home

Calculate Your

Insulation Savings

Cellulose Insulation Manages Moisture Without Air/Vapor Barriers

Most construction industry professionals understand the basics of air infiltration.

Controlling Moisture

DOE website diagram of double wall construction with cellulose insulation and vapor barrier
U.S.DOE suggestion of a vapor barrier in double wall construction may not be necessary when using cellulose insulation in warmer climates. Verify with your contractor.

A common misconception, even among construction industry professionals, is that all buildings, regardless of the insulation used, require vapor barriers. However, CIMA does not recommend the use of vapor barriers with cellulose insulation, except in extremely cold climates, or in circumstances of exceptionally high interior moisture levels, such as an indoor pool facility. The reason is that cellulose is the only insulation that actually manages moisture.

Moisture moves by two transport mechanism: air movement and diffusion. Of these two, air movement is the more significant, accounting for over 98% of the total, and it is the primary cause for moisture related building failures. Cellulose insulation impedes the movement of air generated by wind, stack effect, and mechanical imbalances within homes and buildings. By blocking the movement of moisture-laden air, cellulose reduces moisture movement to manageable levels within the building assemblies. Any remaining moisture is diffused by the cellulose, and will be further blocked by primers or paints used on the interior surfaces. Beyond this, cellulose insulation is a buffer, storing moisture safely in the cellulose fibers during wetting cycles and releasing it during drying cycles.

A vapor barrier over cellulose insulated exterior walls is not only an unnecessary expense but also can be potentially harmful, especially during the summer months in air-conditioned buildings, when warm, moist air passes through wall assemblies and condenses on the outside of the cool poly vapor barrier. The hygroscopic nature of cellulose insulation allows it to manage and wick moisture from areas of greater to lesser concentrations, thus preventing damaging amounts of moisture from accumulating.

This is a key distinction between cellulose and other types of insulation and an important benefit for homeowners and businesses when making insulation decisions.

Note: Many building codes require an air barrier or vapor barrier be installed. Work with your local officials regarding compliance. A Producer Member of CIMAC can supply you with data regarding vapor barriers and cellulose insulation for your location.

Home Industry Professionals
Architects
Builders
Insulation Contractors
Insulation Performance & Value
Performance Features Table
Insulation Myths
Insulation Costs
Sound Control
Fire Control
Air/Vapor Barrier
Low Carbon Footprint Homes
Insulation Tech Data/Research
Links
FAQ
Homeowners
Insulation Basics
Why Insulate
Where to put Insulation
Types of Insulation
What R-value Means
Incentives & Tax Credits
Insulation Performance & Value
Performance Features Table
Insulation Myths
Insulation Savings Calculator
Air/Vapor Barrier
Sound Control
Fire Control
Installing Insulation
DIY Installation
Dry Blow-in Insulation
Sprayed Insulation
Retorfit Installations
Hiring Insulation Contractors
Selecting A Contractor
Find Insulation & Contractors
Insulation Tech Data/Research
Links
FAQ
Environmental
Eco-Friendly Cellulose Insulation
Cellulose Insulation Environmental Facts
Environmental Facts Table
Recycle Paper Into Insulation
Low Embodied Energy
Regionally Produced Products
No Product Waste
Low Carbon Footprint Homes
Greenest of the Green
Greenest of Green Campaign
Cellulose Insulation Green Facts
CIMA Greenest Insulation Blog
About CIMAC
Producer Members
Associate Members
Find Insulation & Contractors
Contact Us
News
Blog
News Releases
38-10, Place du Commerce, #255, Îles des Soeurs, Montreal, QC H3E 1T8 • Toll Free: 01-800-515-1024 • Fax: 937-222-5794
© 2014-16 Cellulose Insulation Manufacturers Association of Canada • cimac@cellulose.orgPrivacy Policy