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Site Map: Crawl Space Vapor Barrier-Basement Liners- Encapsulation 

Polyethylene Vapor barriers for crawl space play an important role in:

  •  Reducing and Retarding moisture migration- acting as a moisture barrier

Why is it important to reduce water vapor from entering a building structure? Because water vapor can cause poor insulation performance, structural damage and other moisture related problems. When water vapor enters the building envelope it may condense within the building cavities. A good polyethylene vapor barrier with low permeance keeps moisture from infiltrating the building envelope.

Many of our vapor retarders can be manufactured in sizes to meet your project's requirements up to 200' x 200' (61m x 61m). The significance of a large vapor retarder means fewer in-field seams thus reducing the potential for failure.

  • Retarding certain gases that come up through the earth  Learn about Radon Here

  • Guarding against mold and mildew and terrible smell

What's the best liner for you? It depends on the ground you are covering, and whether there is radon in your area. Will the crawl space liner be laying on top of sharp rocks?  Some liners are stronger and more heavy duty than others. The stronger thicker liners are better suited for sharp rocky floors. Make sure that each liner below has been tested to the ASTM E 1745. This test says that the materials shall be subject to tests for water vapor permeance, tensile strength, and puncture resistance. Class A is the strongest liner. Lining a basement or crawl space is not fun. It's best to get it right the first time.

Get the Comprehensive Guide To Crawl Space Vapor Barriers Here

Learn more about the importance of a vapor barrier here.

Choosing the Right Crawl Space Vapor Barrier: Unraveling the Depths of 6 Mil vs. 10 Mil vs. 20 Mil

Crawl Space Liners 101- A Thorough Explaination

Watch the video, Cracking the Crawl Space Humidity Code! What to do!

 

Poly Scrim 6 FR-

Skrim Reinforced Fire Retardant Poly

Poly Scrim 8  

Class C ASTM E-1745 Vapor Retarder   

Reinforced 3 ply laminate. Provides high strength and durability in a lightweight material.

Poly Scrim 14

Reinforced 5 ply. Delivers extra strength for applications requiring additional strength and puncture resistance.

 

What is Permeance?

Permeance is a measure of how easily water vapor can pass through a material, and it is critical to understand for a vapor barrier because it determines how much moisture the barrier will allow to pass through.

What is Class I, II, oerIII?

  • The International Residential Code (IRC) defines vapor retarders as Class I, II or III based on how permeable they are to water vapor, the lower the permeability – the less water vapor that will pass through the vapor retarder.
    • Class I – Very low permeability vapor retarders – rated at 0.1 perms or less. Sheet polyethylene (visqueen) or unperforated aluminum foil (FSK) are Class I vapor retarders.
    • Class II – Low permeability vapor retarders – rated greater than 0.1 perms and less than or equal to 1.0 perms. The kraft facing on batts qualify as a Class II vapor retarder.
    • Class III – Medium permeability vapor retarders – rated greater than 1.0 perms and less than or equal to 10 perms. Latex or enamel paint qualify as Class III vapor retarders.
  • Griffolyn® Type-55 FR is a Class A vapor retarder. It is a fire-retardant vapor retarder made of polyethylene laminates. It has a permeance of 0.003 perms, which is very low.
  • Griffolyn® TX-1200 FR is a Class 1,  Class A flame spread rating per UBC-42 and ASTM E-84. It is a fire-retardant vapor retarder made of polyethylene laminates. It has a permeance of 0.005 perms, which is still very low.
  • Griffolyn® Type-90 FR is a Class B vapor retarder. It is a fire-retardant vapor retarder made of polyethylene laminates. It has a permeance of 0.01 perms, which is low.
  • Griffolyn® Vapor Barrier is a Class I vapor retarder. It is made of polyethylene laminates. It has a permeance of 0.002 perms, which is very low.
  • Griffolyn® Heavy Duty Vapor Barrier is a Class I vapor retarder. It is made of polyethylene laminates. It has a permeance of 0.001 perms, which is extremely low.

The class of a vapor barrier is determined by its permeance. The lower the permeance, the more restrictive the vapor barrier is to moisture transmission. Class A vapor barriers are the most restrictive, followed by Class B and Class C.

  • Poly Scrim 6: 0.058 grains/hr-ft2-in Hg (3.2 ng/(Pa-s-m2))
  • Poly Scrim 8: 0.048 grains/hr-ft2-in Hg (2.6 ng/(Pa-s-m2))
  • Poly Scrim 10: 0.038 grains/hr-ft2-in Hg (2.1 ng/(Pa-s-m2))
  • Poly Scrim 12: 0.032 grains/hr-ft2-in Hg (1.8 ng/(Pa-s-m2))
  • Poly Scrim 14: 0.024 grains/hr-ft2-in Hg (1.3 ng/(Pa-s-m2))
  • Poly Scrim 16: 0.019 grains/hr-ft2-in Hg (1.1 ng/(Pa-s-m2))
  • Poly Scrim 18: 0.016 grains/hr-ft2-in Hg (0.9 ng/(Pa-s-m2))
  • Poly Scrim 20: 0.013 grains/hr-ft2-in Hg (0.7 ng/(Pa-s-m2))

What is a vapor barrier AKA vapor retarder?

A vapor barrier is a material that is used to prevent the passage of water vapor through a building assembly. The permeance of a vapor barrier is important because it determines how much moisture the barrier will allow to pass through. A vapor barrier with a low permeance will allow less moisture to pass through than a vapor barrier with a high permeance.

The permeance of a vapor barrier is measured in perms. A perm is a unit of measure that is equal to the amount of water vapor that will pass through one square foot of material in one hour when there is a one-inch water vapor pressure difference between the two sides of the material.

The type of vapor barrier that is used in a building assembly depends on the climate and the materials that are being used. In a humid climate, a vapor barrier with a low permeance is used to prevent moisture from building up inside the building. In a dry climate, a vapor barrier with a higher permeance may be used to allow moisture to escape from the building.

It is important to understand the permeance of a vapor barrier when choosing the right one for a particular application. By understanding the permeance of a vapor barrier, you can help to ensure that the barrier will effectively control the moisture in the building assembly

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