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Building Insulation--Vapor Barriers

CertainTeed Corp.

CertainTeed MemBrain™ Clear Polyamide Vapor Retarder--1200 sq ft

ebuild Ref. No. MB-9
Retail Price Information
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Features and Benefits

  • Basic Use: CertainTeed MemBrain™ SMART Vapor Retarder is a vapor retarder sheeting intended for use with unfaced, vapor permeable mass insulation (fiber glass and mineral wool) in wall and ceiling cavities.
  • Benefits: MemBrain™ SMART Vapor Retarder is a polyamide film that changes its permeability with the ambient humidity condition. The product’s permeance is 1 perm or less when tested in accordance with ASTM E 96, dry cup method, and increases to greater than 10 perms using the wet cup method. This process allows closed building envelope systems to increase their drying potential with seasonal climatic changes. With a high resistance to water vapor in winter, MemBrain reacts to relative humidity by altering pore size, allowing water vapor to pass through it. When conditions change and relative humidity increases above 60%, the pores in the material expand and its permeability increases. This transformation permits drying to occur, in either direction, through the process of vapor diffusion. Thus, its lowered resistance value supports the drying process, therefore decreasing moisture accumulation within the construction and potential moisture damage. This product can be used in place of traditional vapor retarders with unfaced fiber glass insulation to provide an insulation system that is ideal in some of the more severe climate condition areas in terms of both temperature and humidity.

Product Specifications

Manufacturer Model No. MB-9
Product Name MemBrain™: The SMART Vapor Retarder
Thickness 2 mil
Width 112 in.
Length 100 ft
Box Length 31 1/2 in.
Application
  • Ceilings
  • Heating and mixed climates
  • Relative humidity climates < 50%
  • Wall cavities
Material Polyamide (nylon)
Coverage per Unit 1200 sq ft/unit
Quantity per Unit 45 rolls/pallet
Shipping Weight 608 lb/pallet
Notes
  • MemBrain is a polyamide film that changes its permeability with ambient humidity conditions
  • Intended for use with unfaced, vapor permeable mass insulation (fiber glass and mineral wool) in wall and ceiling cavities
Warranty Period Limited 1-year warranty
Meets Standards
  • = 1.0 perm (57 ng/Pa•s•m2) (ASTM E 96, Standard Desiccant method)
  • > 10 perms (1.144 ng/Pa•s•m2) (ASTM E 96, Standard Water method)
  • Water vapor permeance values are determined by ASTM E 96
Shipping Weight 12.50 lb.

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