Skip to content
Shop Your Local Store ● Ship to Your Hometown Store
Pro & Contractor Accounts ● Apply for Net Terms
100,000+ Products ● Trusted Authentic Brands
FAQ Shipping & Returns Order Lookup Contact Account
CertainTeed MemBrain 9 ft. W X 100 ft. L X 2 mil Air Barrier and Smart Vapor Retarder Roll 933 sq ft
CertainTeed MemBrain 9 ft. W X 100 ft. L X 2 mil Air Barrier and Smart Vapor Retarder Roll 933 sq ft
CertainTeed MemBrain 9 ft. W X 100 ft. L X 2 mil Air Barrier and Smart Vapor Retarder Roll 933 sq ft
CertainTeed MemBrain 9 ft. W X 100 ft. L X 2 mil Air Barrier and Smart Vapor Retarder Roll 933 sq ft
CertainTeed MemBrain 9 ft. W X 100 ft. L X 2 mil Air Barrier and Smart Vapor Retarder Roll 933 sq ft
CertainTeed MemBrain 9 ft. W X 100 ft. L X 2 mil Air Barrier and Smart Vapor Retarder Roll 933 sq ft
CertainTeed MemBrain 9 ft. W X 100 ft. L X 2 mil Air Barrier and Smart Vapor Retarder Roll 933 sq ft
CertainTeed MemBrain 9 ft. W X 100 ft. L X 2 mil Air Barrier and Smart Vapor Retarder Roll 933 sq ft
CertainTeed MemBrain 9 ft. W X 100 ft. L X 2 mil Air Barrier and Smart Vapor Retarder Roll 933 sq ft

CertainTeed MemBrain 9 ft. W X 100 ft. L X 2 mil Air Barrier and Smart Vapor Retarder Roll 933 sq ft

Made in America

Support American manufacturers + independent hardware retailers in one purchase.

A smart vapor retarder that adapts to humidity, covering 933 sq ft per roll for attics and walls.
Certainteed MPN 902009 In Stock & Ready to Ship
$199.99
Free shipping on orders over $149
Ships within 24 hours · most orders arrive in about 2 business days
Ships free on orders over $149 $14.99 flat shipping until your order reaches $149.

About Product Overview

CertainTeed MemBrain is a smart air barrier and vapor retarder membrane built for attics and walls, where controlling moisture matters as much as blocking drafts. Unlike a fixed poly vapor barrier, MemBrain is engineered to respond to humidity, which is why CertainTeed classifies it as both an air barrier and a smart vapor retarder rather than a standard poly sheet. Each roll runs 9 feet wide by 100 feet long, covering roughly 933 square feet, so one roll handles a good-sized wall or ceiling section before you need to break out a second. It's formaldehyde free, which matters for indoor air quality in tight, well-sealed assemblies. Made in the USA, this roll suits builders and remodelers buttoning up new construction or retrofitting older homes with better air sealing. Manufactured by CertainTeed, a name well known in insulation and building materials.

  • Product type: Air barrier and smart vapor retarder
  • Sub brand: MemBrain
  • Coverage: 933 sq ft per roll
  • Dimensions: 9' wide x 100' long, 2 thickness
  • Formaldehyde free
  • Recommended use: Attics and walls

The Details Specifications

Brand Certainteed
Model / MPN 902009
UPC 042919020090
Weight 13 lbs
Country of Origin USA
Safety Data Sheet (SDS) Manufacturer documentation · opens in new tab
Price check

Go ahead. Check.

You're going to price-check us against Amazon, Home Depot, and Lowe's. Everybody does. Good — open all three tabs. We'll wait. Then look hard at what you're actually being handed over there.

On Amazon, start with these four questions before you click buy.

01

Who's actually selling it

The brand name is on the listing. A different company is in the seller field. Those aren't the same thing, and the second one is who you're buying from.

02

Whether the warranty survives

Most manufacturers only honor a warranty when the unit came through an authorized dealer. We're authorized for Certainteed. A third-party marketplace seller usually isn't.

03

Where the box came from

Gray-market stock, returns repackaged as new, and outright fakes move through marketplaces constantly. It all looks identical in the photo. It stops looking identical when it fails.

04

Who you call when it breaks

Ours is a phone number with a person behind it who has held this product. M–F, 6 AM – 5 PM Pacific. (866) 469-8556

The big boxes don't care if your hardware store survives.

Amazon, Home Depot, and Lowe's are built to pull every hardware dollar out of your town. When the local shop can't keep the lights on, the counter where somebody actually knew which part you needed goes with it. We're built the other way: real brands so you're never stuck on a marketplace, and a straight answer to buy it down the street when that's the better call. Support independent hardware — it doesn't restock itself.

Why we tell you to shop local
Authorized dealer · Certainteed

Or skip the tabs entirely and buy it down the street. Find a store near you →

Shop Local · Support Independent

Every order helps keep your local hardware store on the corner.

Why we built NHG
You might find it for less locally. Independent retailers often offer competitive pricing — some products are even cheaper in-store than online.
Real expert advice — not search results. Independent hardware staff know their inventory and the local conditions you're working in.
Keep the neighborhood working. Every dollar spent at an independent retailer returns roughly 3x more to your local economy than at a national chain.

Ask our counter. Or theirs.

Most hardware stores can do more than you think. If we can't help you, the folks down the street probably can — just ask at the counter.

What we offer
Shop Your Local Store Ship to your hometown store
Pro & Gov Accounts Net terms · tax-exempt
Ships Nationwide Direct to your door
Shop Local First Real hardware stores
$0.68 of every dollar spent at a local independent business stays in the community. At a national chain, it's about fifteen cents. Civic Economics, multi-city retail studies
100% Authorized & Genuine — Our Guarantee →
Their Counter
Try local first · we'll wait

The stores we send you to are local and independently run — often for generations, the kind of place where someone behind the counter knows the regulars. We don't own them. We just think they deserve the foot traffic. They can put most of what we sell on their next truck. Ask there before you check out here.

Find a local store →
Mon–Fri 6–5 PST
Independent hardware retailer? Join the network → Make hardware content? Earn 6% as a creator →
About our directory. National Hardware Group is an independent retailer and directory. The local stores we list and link to are separately owned and operated — we have no ownership stake in any of them, and most pay us nothing to be included. That includes plenty of stores flying a familiar banner that people don't realize are locally owned and run, not operated by a corporation. Store owners can choose to upgrade their listing for an enhanced presence or pickup features, but the base directory is free, and inclusion is never a paid endorsement.

Compare products

{"one"=>"Select 2 or 3 items to compare", "other"=>"{{ count }} of 3 items selected"}

Select first item to compare

Select second item to compare

Select third item to compare

Compare