0042919020182

CertainTeed MemBrain

Model # 902018

Internet # 205920791

Store SKU # 1001320880

100 in. x 50 ft. Air Barrier with Smart Vapor Retarder

$59.72 /each
  • Guards against moisture
  • For use as vapor retarder
  • 100 in. x 50 ft. Air Barrier with Smart Vapor Retarder

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PRODUCT OVERVIEW

Model # 902018

Internet # 205920791

Store SKU # 1001320880

For extra protection against moisture, the MemBrain Continuous Air Barrier and Smart Vapor Retarder is your weapon of choice. It lets wall cavities dry out, to help prevent mold. In summer, when humidity is high, it increases permeability so that moisture can escape, as air tightness is maintained. In winter, when humidity is low, it continues to block moisture. Use MemBrain with un-faced insulation in place of kraft faced insulation or polyethylene. Not all climate zones require vapor retarders.

  • Unlike traditional vapor retarders, MemBrain helps prevent mold by sensing and adapting permeance to varying humidity throughout the year to keep the wall cavity dry
  • For use with un-faced insulation as a vapor retarder in climate zones where one is required
  • Prevents moisture vapor from entering the wall cavity in the winter
  • Allows any moisture buildup to escape the wall cavity in the summer
  • Installs like poly with an extra level of moisture protection
  • Continuous air barrier and smart vapor retarder
  • Unique, patented product
  • Roll is 100 in. tall and 50 ft. long
  • How much do you need? Let our calculator help:

    Info & Guides

    You will need Adobe® Acrobat® Reader to view PDF documents.  Download a free copy from the Adobe Web site.

SPECIFICATIONS

Dimensions
Product Depth (in.) 
0.002 
Product Height (in.) 
100 
Product Length (ft.) 
50 
Product Thickness (in.) 
0.002 
Product Width (in.) 
100 
Details
Insulation Type 
Accessory 
Product Weight (lb.) 
5 lb 
Returnable 
90-Day 
Warranty / Certifications
ENERGY STAR Certified 
No 
Warranty Information 
None 

MORE PRODUCTS WITH THESE FEATURES

Price: $50 - $100
Brand: CertainTeed MemBrain
Review Rating: 4 & Up
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4 Questions5 Answers

Customer Questions & Answers

100 in. x 50 ft. Air Barrier with Smart Vapor Retarder
100 in. x 50 ft. Air Barrier with Smart Vapor Retarder

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2 answers

What type of drywall could be put over this in a basement? Since the drywall cant breathe won't the moisture be trapped?

This question is from 100 in. x 50 ft. Air Barrier with Smart Vapor Retarder
Asked by
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November 24, 2015
I am looking into using Roxul comfort board IS behind the framed wall and Roxul comfort batt between the studs on the outer walls or my basement. Both allow moisture to pass through so I need an air barrier that does the same but I am concerned that moisture will just build up behind the drywall.
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Answers (2)

Asked by
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December 28, 2015
Answer: 
Drywall is vapor permeable. That is the point of this Membrain. If moist air (winter time) passes through the drywall this Membrain will stop it from entering your insulation cavity. If moisture builds in the drywall cavity (from the exterior, wind driven rain or condensation) the Membrain will allow it to dry to the inside of your house.
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Asked by
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December 4, 2015
Answer: 
In regards to drywall choices, it should not matter. With the use of MemBrain, once the cavity reaches a relative humidity of 60%, the molecular structure will slowly open allowing moisture vapor to pass through. Moisture will slowly move through the drywall through diffusion.
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1 answer

Can this be used over open cell spray foam in attic?

This question is from 100 in. x 50 ft. Air Barrier with Smart Vapor Retarder
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April 27, 2016
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Answer (1)

Asked by
Salt Lake City, UT
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Home Improvement Profile: DIYer
April 28, 2016
Answer: 
The product specs indicate that "MemBrain has not been tested for use with wet spray insulation systems and is not recommended at this time." I'm not sure why--perhaps because the permeability ratings of spray foam insulation are all over the map--but you should talk to a CertainTeed representative.
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1 answer

Can I use this as a wall fabric for blown in insulation?

This question is from 100 in. x 50 ft. Air Barrier with Smart Vapor Retarder
Asked by
Grants Pass, Or
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January 5, 2016
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Asked by
Salt Lake City, UT
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Home Improvement Profile: DIYer
January 10, 2016
Answer: 
I had "blown-in batt" insulation professionally installed, with this product used as a vapor retarder. The installers still used a fabric material to contain the insulation. I don't think MemBrain would work well because it tears relatively easily (at least, once a tear is started).
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If foam board is installed on the outside acting as an air/vapor barrier, will this product work for the inside?

This question is from 100 in. x 50 ft. Air Barrier with Smart Vapor Retarder
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December 29, 2015
I'm concerned about water being trapped on the inside of the wall and causing mold issues?
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Home Improvement Profile: DIYer
April 28, 2016
Answer: 
That is pretty much the scenario that this product was designed for. Moisture will find a way into a wall regardless of how meticulously it was constructed, and this product will allow water vapor to escape if the relative humidity exceeds a certain level.
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CUSTOMER REVIEWS

Rated 4.6 out of 5 by 12 reviewers.
Rated 5.0 out of 5.0 by Fairly easy to install; obscure directions The wrap unrolls fairly easily, and cuts with a single-edge razor blade through all four layers very easily. Although the instructions indicate that it can be used only for interior use, I had a need for it on the protected side of the edge of the garage where the sewer pipe comes out: Between the landscaper's work around the area and recent storm activity, the vinyl siding along that edge had blown off and was damaged beyond functional and aesthetic use. I also needed to replace the foam insulation panel between the garage wall and the siding, so, given that rain rarely hits that edge (there's an overhang), I decided it was worth the little extra effort to protect the middle surface. After installing the foam panel (in hindsight, I could have installed the wrap between the garage wall and foam panel!), I overlapped two pieces of the wrap, that I cut to size, over it. The instructions state that staples should be spread 12-24" apart, presumably to reduce the number of holes that penetrate it, and, thus, keep it functioning to prevent mold. However, the small area made that impossible, so, I stapled every 6" to keep it upright. The 2 mm thickness kept the sheet relatively in place, though it tended to flop over itself as I was stapling and trying to keep a smooth, wrinkle-free, layering. It took all of 5 minutes to do this small area, and I am very satisfied that it will protect much better against the elements than if I had left it alone. Before getting this product, I was going to use winter window insulating wrap, which is only a little thicker than food-style plastic wrap, and is made of petroleum product, rather than nylon, as this wrap is. As for value, it may seem expensive, but, it covers a lot of area, which, if it is exposed to a high humidity, will probably pay for itself in preventing mold, mildew, dirt, etc. As such, I believe it is worth the expense, and fairly easy for a do-it-yourselfer, though, if you are going to do entire walls, you should have at least one other person to help hold up one end, as I will, when I have to replace the shower, which is a few months off (plenty of wrap left!). I would also point out that the single-page instructions are very obscure, and I had to guess at what they were talking about (for one thing, it doesn't say whether the logo side should be facing out, up, or whatever; perhaps it doesn't make a difference, as it would with similar wraps, but, I erred on the logo-side-out-and-right-side-up side!). April 14, 2016
Rated 5.0 out of 5.0 by Looks to be a great product. Our kitchen/bathroom remodeling project has progressed, ceiling and rebuilt 2 exterior walls are insulated and now we used over insulation this vapor barrier (pic.1) . Installing drywall will be next step. Just before we started using this product I found from product info that this vapor barrier is laid over unfaced insulation. Too late for us, because we have used faced insulation (surplus from previous improvements stage). We laid this vapor barrier over it anyhow and I hope, it will work well. Other use I found for placing this membrane as a vapor barrier for framing of shower stall to protect wooden studs under the cement board (pic 2) (waterproofed with red waterproofing from inside of shower stall). We were two people handling this membrane so that installing went very easy. It's a light material which gets stapled to studs and with little care while working with it, it does not tear easily. Inside the boxed wrap are very detailed instructions (pic.3) (English & Spanish) with pictures, advising how to work with membrane, how to cut it over larger openings and electrical boxes (pic. 4 & 5). I hope product will work well for us at least during seasonal very humid weather. February 23, 2016
Rated 5.0 out of 5.0 by Good product the material is firm enough to easily handle a 14 foot reach. this was the easiest part of finishing the ceiling. April 26, 2016
Rated 5.0 out of 5.0 by Very easy to use very easy to use and install ...................... April 5, 2016
Rated 3.0 out of 5.0 by Not for exterior side of walls! I obtained this product to use on a project to replace some exterior rotten wooden cladding. The wood had rotted out and my plan was to pull off the rotten wood and replace it with new cladding. The box states that this product prevents moisture vapor from entering the wall cavity in winter and allows vapor to escape the cavity in the summer. It goes on to say how the home can be protected from harmful moisture in the walls by installing in basements, bathrooms, laundry rooms and exterior walls. OK sounds good, and I imagined that it is a similar product to the wraps one sees installed to provide a vapor barrier. Inside the box on the instruction sheet, we learn however that this product has to be installed on the inside side of the wall cavity, i.e. on the drywall side rather than on the cladding side. In that case, how could it possibly prevent outside moisture from entering the cavity??? Outside moisture gets to the cavity before encountering the product! The instructions inside the box state that it is not suitable for use as an exterior vapor retarder. That piece of information is nowhere to be found on the outside of the box. I decided to go ahead with the installation anyway as this is what I had. There was already a layer of Tyvek underneath the rotten cladding anyway so I decided to simply install the MemBrain over that and in the correct orientation. This review should thus be read with 2 facts in mind: a) it is supposed to be installed under the drywall and not the cladding b) I have no way to tell how effectively it works, which would take some years of controlled testing. The instructions give good clear information on how to roll it out and hang the product on the studs and sill (inside the building). The plastic sheeting is transparent and has the product name printed on it so that one can tell which side should face outwards. It is folded so that the top edge can be stapled along the top of the wall and then unfolded down into the room. In reality of course it will unfold as one goes to staple it along the top of the wall. In my case, the wall consisted of pink insulation between studs, sheathing, Tyvek and shiplap boards. I removed the wooden shiplap and then installed the Membrane plus ½” foam insulation and the T1-11 siding. The MemBrain was easy to cut and staple in place. The outside of the box (and also the website) includes two diagrams of how the product prevents moisture coming in during the summer during high humidity, and keeps it in, in the winter. The diagram makes absolutely no sense at all though because water vapor (represented by blue arrows) is shown in both cases to be coming into the house! I think the arrows in the ‘summer’ diagram should be reversed 180° to indicate that moisture can get out, but not in. See pictures provided. Rather disconcerting. October 9, 2015
Rated 5.0 out of 5.0 by Good Quality Vapor Barrier I used this to cover the gravel in my crawl space. It features that the membrane when all taped will prevent moisture from coming through and it senses and adapts permeance to varying humidity throughout the different seasons of the year. It prevents moisture buildup by allowing it to escape the cavity in the summer. It installs like polyethylene with an extra level of moisture protection for comfort in the home. It is about 8' wide and 50' long so you can divide it into two shorter sections if needed. Coverage is about 420 sf. March 25, 2016
Rated 5.0 out of 5.0 by Air Barrier with Smart Vapor Retarder I need to install a vapor retarder in the bathroom. After reading up on this product, this look like is what I'm looking for. This product is use for interior walls and not for exterior walls. The product comes with instruction inside how to install it. It's pretty easy to install. If you should have to use more than one piece of MemBrain per wall, make sure the pieces overlap by at least 3". If there is any tears more than 4" use Scotch 610 2" wide to repair them. Time will tell if the product works. January 7, 2016
Rated 4.0 out of 5.0 by Time will tell if it keeps out the moisture I'm using this product a little differently as a temporary fix. My sunroom has an old and drafty door that I cannot replace until I remodel the entire room. Last year, to keep out the cold, I put up a sheet of rigid foam over it during the winter. In the spring when I removed the foam, I found a little bit of mold growing on the foam and door frame. Now that I have this vapor retarder, I placed that around the door and then put the foam over it. I don't know the exact thickness of the product. If I had to compare it to something I'd say maybe similar or a tiny bit thicker than a Ziploc bag. I can't comment quite yet on whether it's doing what it's supposed to do since I won't be taking the foam down until spring. I plan on using this product for the walls of the sunroom when I remodel it because there's currently no moisture barrier in there. October 16, 2015
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