CertainTeed

Buying Guide: Smart Vapor Retarder Rolls

How the Membrane Manages Moisture
The MemBrain membrane lets wall cavities dry out, which helps prevent mold. In summer, when humidity is high, it increases permeability so moisture can escape while air tightness is maintained. In winter, when humidity is low, it continues to block moisture.

Choosing a Roll Width
Each MemBrain roll comes in a different width: 8 ft. W x 100 ft. L (833 sq ft), 9 ft. W x 100 ft. L (933 sq ft) and 10 ft. W x 100 ft. L (1033 sq ft). Measure the wall area you plan to cover and compare it with the square footage on each roll before ordering.

Frequently Asked Questions

What does CertainTeed offer under this brand?
The CertainTeed products in this range are MemBrain Air Barrier and Smart Vapor Retarder rolls. They are offered in 8 ft., 9 ft. and 10 ft. widths, each 100 ft. long.

How do I choose the right roll size?
Measure the wall area you need to cover, then compare it with the square footage shown for each width. Match the size on your old material if you are replacing an existing product, and check your project plans before ordering.

How does the smart vapor retarder change with the seasons?
The membrane increases permeability in summer, when humidity is high, so moisture can escape while air tightness is maintained. In winter, when humidity is low, it continues to block moisture. Follow the manufacturer's instructions for installation.