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

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:

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Customer Questions & Answers

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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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This question is from 100 in. x 50 ft. Air Barrier with Smart Vapor Retarder
 
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What type of drywall could be put over this in a basement? Since the drywall cant breathe won't the moisture be trapped?

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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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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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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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This question is from 100 in. x 50 ft. Air Barrier with Smart Vapor Retarder
 
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I would like to install tongue and groove wood on the interior side of exterior walls and I have faced Kraft installed

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August 25, 2016
But I would like better more continuous air barrier in place. Is this product able to be placed directly over the Kraft faced batt insulation or will that trap moisture? I'm in north east Ohio. The lay out would be vinyl Siding/tyvek house wrap/wood/faced batt/ your product/tounge and groove.
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Salt Lake City, UT
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Home Improvement Profile: DIYer
August 29, 2016
Answer: 
The house wrap is your air barrier, so unless it was installed improperly, you shouldn't need another one. That being said, even if moisture were to get between the kraft paper and this product, the smart vapor barrier would allow drying to the inside of the wall assembly.
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Can I use this over faced insulation and leave in in place when hanging drywall? Would be a year or so at least.

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July 31, 2016
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Salt Lake City, UT
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August 9, 2016
Answer: 
If you are using faced insulation, you already have a vapor barrier. While there shouldn't be any harm in installing MemBrain over it, there's also no benefit to doing so.
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Is insulation required for the product to function?

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June 26, 2016
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Maine
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July 7, 2016
Answer: 
No
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Customer Reviews

Rated 4.5 out of 5 by 15 reviewers.
Rated 3.0 out of 5.0 by Didn't use After some research it was determined that I did not need a vapor retarder for this project. It did arrive on time as promised. August 24, 2016
Rated 4.0 out of 5.0 by Good product Blocks moisture from outside coming in and moisture from inside going out. Easy to install August 17, 2016
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 Works? I bought a very old house. While installing new wiring, discovered mice had shredded all the rolled fiberglass insulation. It was in balls at the bottom of the wall cavities. Decided to replace it with stone wool insulation (better sound proofing and less likely to be mice nesting). It has no vapor barrier. Besides in bathrooms, with high humidity, I think vapor barriers do more harm than good (at least for one season out of the year) ... but they are required by code in my zone. Thought I would give this a try. It was not much more than standard vapor barrier and just as easy to install. Time will tell how 'smart' it really is. June 25, 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 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 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 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
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