For many building science questions, the answer is, 'It depends.' As you can see, the permeance rises as the relative humidity rises and hits 10, the point at which we describe a material as vapor permeable, when the RH is 60%. I guess the principle was not to create a vapor retarder but vapor preventer. And thanks, too, for the additional evidence of diffusion not being the problem, even in cold climates. We’ve decided on unfaced 12” fiberglass batts and hired quality contractors. Well this is an easy one.     Regards,  Brenda Wright  Permissions Liaison. Enter your Postal/Zip Code to see only the products available in your area. Fiberglass batt & roll insulation options are common because they’re so easy to install. Designed for one side wall exterior brick or rock facing. However, stapling insulation in this manner creates and improper seating of the drywall during installation. Find out how much you could save. R-30 EcoTouch PINK Unfaced Fiberglass Insulation Batt 16 in. Drywall is a finish product which one will look at for the duration of the homes existence. Abe: I love your analogy! The Format Group would like to acquire permission to use it in a training manual titled Building Envelope Book 1: Principles by Carpenters International Training Fund. Due to variation in computer monitors, mobile devices and printers, Now, how you can stand to live in a place with up to 25 heating degree years of cold weather each winter is beyond me, but it's good to have people willing to test the principles of building science in extreme climates. And a T & G plank roof deck is far more tolerant of wintertime moisture drives than OSB, not to mention that those moisture drive in Arkansas climate zone 3 aren't nearly what it is in cold climates." If you install fiberglass batt insulation* with a kraft paper vapor retarder in a home, which way do you face the vapor retarder? You have to approach slowly and quietly because they spook easily. The damn facing obscures your work, slowing down the installation and resulting in a poor insulation grade. By using our site, you agree to our use of cookies. Allison--a great article. If that really mattered, do you think the US building code would have dropped the requirement to use paper-faced batts? Thanks Alison    Here in mixed climate mid-Atlantic, my preference is for a wall design with the following qualities:  - permeable both inwards and outwards for drying at both seasonal extremes  - rigid foam exterior to bring framing inside the thermal envelope- minimize conductivity  - avoid fiberglass altogether or unless one is confident of an air sealed cavity- as in flash and batt/ air-sealed drywall or similar. If your building inspector wants you to put the kraft paper on the 'wrong' side, take another look at the graph above and be comforted that it doesn't really matter. I have been a drywall contractor for over 30 years and I can say unequivocally that stapling the insulation tabs over the studs (not to the sides of the studs) will cause the drywall screws to pop, if not right away certainly over time. The moisture ran down the plastic and started rotting the treated base/sill plates out. after that experience we not apply all batts with kraft face to the studs. but should not be relied on as the sole reference point. And most walls with asphalt saturated kraft paper thank the building science gods for the difference.". Lines of popped screws are highly evident once the walls have been painted and are not easily fixed. Vapor Barrier? dt = temperature difference (o F, K). And they can be installed just about anywhere, from your attic to your floor. Can I borrow it (w/ credit of course)? We’re making it easy to find comparable CertainTeed products to get the job done right. they dpon't ssign off and it get done my way. The overall heat transfer coefficient - the … In the Hot and Humid Climates the paper goes to the outside (Hot Side) and in the north it is to the inside. Fiberglass batt & roll insulation options are common because they’re so easy to install. The graph below, from that paper, shows water vapor permeance as a function of relative humidity. The images on our website can be used to assist in your purchasing decision,     Dave: feel free to use it! This is not directly related to this blog post, but....  What are your feelings on installing rigid foam board over existing kraft paper backed fiberglass insulation batts in knee walls? They’re useful for controlling temperatures, acoustics, and lowering energy costs. I suggest you read Joseph Lstiburek's paper, Mind the Gap, Eh! Connect With Us Wall to Wall SolutionsGet help designing high performance interior wall systems that meet the functional needs of every room of the home. We are assuming that the use of spray polyurethane foam insulation is not an option for one reason or another. I like to go paperless! It was easier to keep the house warm in comparison to when we installed the staple tabs on the side of he studs. Do you believe that it is necessary and more appropriate to remove the kraft paper backed insulation and install unfaced batts prior to the rigid foam board installation? When installed they must be butted together. Excellent thermal performance, and improved acoustical properties for a quieter interior environment. Architectural-Graphic-Standards.pdf *Speaking of fiberglass batt insulation, Carl Seville (a.k.a. … I've seen well-installed batts, though, so I know they CAN work...and not only when they're IN the can, as you suggest.    Rare Grade I Fiberglass Batt Insulation Sighting    . where. Thanks for the shout out, Allison! Then go get yourself some unfaced batts ... - avoid fiberglass altogether or unless one is confident of an air sealed cavity- as in flash and batt/ air-sealed drywall or similar. the Green Curmudgeon) wrote another article on poorly installed batts recently, with photos of Knauf fiberglass. Visit our Building Knowledge blog to read-up on the latest trends, innovations and news in building materials, construction and design. What the Heck?! They’re useful for controlling temperatures, acoustics, and lowering … Also, if the batts are unfaced or kraft-faced, the drying toward the interior would be substantial. H t = heat flow (Btu/hr, W, J/s). Be a Controlling Building Enclosure Control Freak with Control Layers. If there is evidence of higher insulating performance by doing it that way then perhaps it is time for some smart person to invent better insulation. I appreciate that, especially coming from a fellow Summer Camper.    Robert P.: Drying potential is important!    Ron L.: I don't think you're posting your question in the right place.    Chris D.: Thanks! The drywall goes in before the exterior sheathing does.    Wynn P.: Thanks! - no kraft paper ... all at 8000-9000 heating degree days. I have a 2 storey home with upper & lower heat pumps-how should I set both thermostats-It has a open foyer-I now have upper unit set at 65 degrees & lower unit at 70 degrees-not sure if this is most effective-also have gas fire logs I use -I use ceiling fan in lower great room in low winter direction-clockwise-, Allison -- your comments about the irrelevance of the location of kraft facing on fiberglass batts are spot-on, and for all the reasons you iterate. However, most cathedral ceilings and low-slope (flat) roofs are insulated roof assemblies: with this kind of roof, the insulation follows the slope of the roof. The paper looks perfect, but you reach behind it and there's nothing there. Trim-It™Create distinction with a wide offering of accent and decorative trim products from both composite and vinyl product lines. Sounds like a good idea, but the vast majority of moisture problems are caused by air leakage, not diffusion, even in places like Maine. What about installing rigid foam board to the underside of rafters when the rafter cavities are insulated with kraft faced fiberglass batts? Beyond "ballooning" even the small amount of paper tabs over the studs causes failed or not fully driven in screws. SPOILER ALERT: The answer is right below this photo so if you'd rather wait and find out when you see the movie in the theater, don't read any further. I guess this was someones great idea on tightening of the house as far as infiltration. A roof over a vented, unconditioned attic does not need to include any insulation. First, the kraft paper is a vapor retarder meant to reduce the potential for moisture problems caused by diffusion. We use cookies to personalize and enhance your experience on our site. This insulation is used as thermal and acoustical insulation. This is a list of ASTM International standards.Standard designations usually consist of a letter prefix and a sequentially assigned number. Do the air sealing; stop worrying so much about vapor retarders. This is particularly the case at the corners where the drywall tends to be more fragile. †My friend Abe Kruger likes to say that you should treat building inspectors like wild animals. USES Both are designed to slide right into cavities between wood frames. I'm not sure if this was a code and it was required or not I just know that they did it. or I get the engineeer or architect to write the report and keep on file in the truck to remind the ! I'm so tired of having to tear apart a whole house full of perfect looking paper to reveal the hideousness beneath. Visit our Privacy Policy to learn more or manage your personal preferences in our Cookie Consent Tool. ??? Don’t worry, it’s not your house. whats yours Allison? Well done.    To the La note above and Eric--it doesn't matter where the paper is in the lower 48 states. The two staple tabs of insulation paper laid on top of each other to the nailing surface of the stud would seem to be an imperceptible discrepancy (perhaps a 1/16" or less). Unfaced or kraft faced ceiling batts are designed to lay directly on suspended ceiling systems. The plastic ended up condensing moisture on the backside. we had a 500 watt flood light that over heated to room to the point we had to go get a coulpe of 60 watts buls to light the palceand not over heat it. According to your article, it seems unnecesary (since I am using 2″ foam), however I cannot find any rolls of R-13 unfaced fiberglass at the box stores! Foam Board Insulation Types. A = wall area (ft 2, m 2). As Dr. Joe says in the article, "Plastic vapor barriers really are vapor barriers when things get wet. Perms? So just relax. Do you believe that a moisture issue could be instigated between the kraft paper and the rigid foam board? Allison's article is spot-on. x 48 in. we did the ceiling joist the same wal as the on top of the face of the jpoist and studs. As in, IN a garbage can where the fiberglass batt attached to it belongs. is a simple tool designed to give you more confidence in your color choices.     But, just in case anyone still buys and uses faced batts, I'll add two additional comments:    1) You CANNOT do a decent job of installing that which you can't see. I can find R-13 pre-cut batts, but they are twice the price and will result in about 6″ of waste per batt.   Thanks. I like our 3000 HDD in Atlanta.  Â. It just does not occur. All your CertainTeed roofing, siding, gypsum, ceilings and insulation information gathered in one convenient location. Find out how much you could save. ", You Don't Need a Vapor Barrier (Probably). Thats my take. Also on the graph is the permeance of polyethylene. 33 Full PDFs related to this paper. One question, however. Many of these had faced batts installed in the building cavities, with facings installed in every imaginable configuration -- up, down, in, out, torn, taped, stapled here, stapled there -- and I have never ONCE seen evidence of moisture accumulation resulting from diffusion in these building cavities. Insulation Energy SavingsUpgrading your insulation can result in lower heating and cooling bills. The warm-in-winter suggestion says that if you're trying to limit the diffusion of water vapor, put the vapor retarder on the humid side of the wall, where...uh...it's not able to retard much vapor. The answer is that it doesn't matter. I noticed a differance on rough just before drywall. Unfaced, light-density fiberglass batts for use in steel stud construction. Everything is great until winter starts. Available in unfaced and kraft-faced batts, Sustainable Insulation is proven fiberglass technology made with renewable, recycled, and plant based ingredients, with no added formaldehyde, harsh acrylics, dyes or unecessary fire retardant chemicals. Stuff the can tightly, put the lid on and we have a perfect 6 sided air-barrier, surely this isn't merely a coincidence. The kraft paper should always be IN. Building Solutions® Commercial Contractor, Commercial Roofing Construction Details: How to Flash A Pipe (CT-13), Inside R&D: How We Develop Solar Reflective (Cool Roof) Shingles, COVID-19 Heroes: How BMarko™ Structures Turned 48 Shipping Containers into ICU Rooms in 2.8 Weeks. The upshot here is that If you put the kraft paper on the wrong side and it gets wet, it won't trap moisture. Kudos to Knauf!   - did I say avoid fiberglass? Not so asphalt saturated kraft paper. Lots of damage does occur of course from bulk moisture and air migration (another big separate discussion).    So I can agree with you with great certainty: The location of kraft facing is irrelevant because the entire system is an impotent, lousy, fake control layer anyway.Â, Abe K.: You're welcome, Abe!    Frank M: Side-stapling leaves that channel for air movement in each cavity, so what you found isn't surprising. This may optionally be followed by a dash and the last two digits of the … Can I put the peper face against the outside wall and the second piece put fiberglass sides together, so the paper face of the inside paper is against the sheet rock. Batts are pre cut sheets of fiberglass insulation, and rolls are simply longer versions of batts. Quick and easy online tools and calculators that can help you determine your insulation needs, as well as how much you could save! And that's what's going on when you attempt to hang faced fiberglass. A virtual swatch book, ColorCoach™​ is a simple tool designed to give you more confidence in your color choices. Stay in the loop - get ideas and inspiration by following us on social media. Nope. Batts are designed for friction-fit installation. Used in partition or exterior walls. Then go get yourself some unfaced batts (and do your best to install them to Grade I quality). READ PAPER. Vapor Retarder? If there is no evidence of higher insulating performance by stapling the tabs to the stud face then put them on the sides of the stud in the stud bay where they belong. Get help designing high performance interior wall systems that meet the functional needs of every room of the home. Of course, if air is moving in the cavity at all, it can move right through the fiberglass, too, so air-sealing is critical.    Debbie: I think the only way to do that effectively would be with modular homes, where they building inside out. @#$%^& everytime he pretents to know something about high effiecient home construction.   The installers just use the paper to hide their bad installation behind. It’s encapsulated in a comfort coated film for easier, cleaner installs, and is designed for use in standard wood and metal stud assemblies. They learned through trial and errror as to what did happen. Batten type standing seam: Standing seam roof in which the panels are raised up and fastened together and then a batten strip is placed over the seam to form a water-tight … Both are designed to slide right into cavities between wood frames. A few years back in my locale (central Pa.)contractors were insulating then sheeting the inside of the rooms with plastic. A comprehensive roofing specification writing tool allowing users to quickly write accurate steep- and low-slope roofing specifications for job submittal packages. (8-Bags) Save energy, save money, save the planet. If you want to slow down the vapor diffusion, why not do it before it hits the drywall? You've added yet another nail in the coffin of the archaic kraft facing/retarder/barrier system. Just buy un-faced batts, install them to Grade 1 and build your air and moisture control systems in another layer (big separate discussion).    2) I have over the years disassembled and remodeling thousands of residential buildings in Montana, all at 8000-9000 heating degree days. In a really, really cold climate, it may matter, but even in Maine and Ontario, vapor retarder paint would be a better way to go. Batt insulation: Insulation made from matted fibers which may be left unfaced or may be faced on one or both sides with kraft paper, foil, or vinyl. In the HERS rater class I taught in Toronto this week, I used that analogy but before I could get to the reason why they're like wild animals, one of the students said, "You mean we can shoot them? Allison,  Is the image in this article available for use? UPDATED on December 15, 2017 with information on the U-factor alternative. texture or appearance ask to see the actual product, available through a CertainTeed contractor or distributor. Eric P.: Don't be afraid to read past the spoiler alert.    Dave R.: I sent Abe an email alerting him to your request. the images shown may not exactly replicate the corresponding color, texture or appearance. U = overall heat transfer coefficient, "U-value" (Btu/hr ft 2 o F, W/m 2 K). Upgrading your insulation can result in lower heating and cooling bills. Not a good scenario as this could lead to your prverbial black mold and such. ColorView® makes selecting and coordinating siding, roofing, and trim easier and more fun. Second, if you install it the wrong way, it's unlikely that you'll have a problem. To the inside of the home or the outside of the home? You can install the paper facing however you want—as long as the building inspector† lets you, of course. Knowing this, let’s insulate the basement ceiling of a house at 22 Hypothetical Rd. For this one, the answer is clear. If you put it on the right side, where the humidity is, it's not much of a vapor retarder. Pink Fiberglas insulation improves thermal performance, cutting heating and cooling costs throughout the life of the building and pink fiberglass has been tested and certified for better indoor air … Rather than being a bully, like Guardian did to me a couple of years ago, they commented on the article and asked for a dialogue on how to get better installation in the field. eric,  so in a hot humid climate batts are installed with faces stapled to outside of walls? we did have foam house wrap on the exterior with vinyl sidins like always. Maybe sticky strip on the staple tabs that would adhere to the studs sides and create a better seal. There is no way the paper confers enough benefits to make having it worthwhile in my climate, and the code doesn't require it here either.   - no kraft paper  - better yet- Larson truss or dbl framed wall. I am not sure if I should use a faced insulation or not. Several 3 ft x 7 ft window framed openings with trim and flash, IBC 2012 building code with 25 minimal roof snow load, 156 mph wind loading, 3 lb extra ceiling collateral loads, high occupancy 300 people or more occupancy. To verify actual product color, Batts are pre cut sheets of fiberglass insulation, and rolls are simply longer versions of batts. I love askingthem to sign off that there way is better and won't causea problem. Blend-it™Browse our solid colors and blended mixes to find the natural cedar appearance you want. Your source of knowledge about the world of building science, home energy efficiency, green jobs and more. this was before we understood or did the extra air sealing. Browse our solid colors and blended mixes to find the natural cedar appearance you want. can you double up paper back insulation to fill deeper space by using 2 by 6 board studes as framing. I love arguements with the inspectors. My answer: neither. This is in part due to the fact that insulation installed with its staple tabs to the stud face tends to "balloon" out of the stud bays making it harder to to get proper "seat" to the framing, for the drywall. Great points about the problems with faced batts. Many of these had faced batts installed in the building cavities, with facings installed in every … Create distinction with a wide offering of accent and decorative trim products from both composite and vinyl product lines. The wetter it gets, the better it dries. I’ve written several posts about how to insulation basement walls in which I promote the use of foam board insulation as the first line of defense against moisture and mold. © 2021, Energy Vanguard | 533 West Howard Avenue, Suite E, Decatur, GA 30030 Â, another article on poorly installed batts, Combustion Safety 101: Three Types of Problems, How to Make a High-MERV DIY Portable Air Cleaner, How to Make a Good High-MERV Filter Even Better, 10 Consequences of Keeping Your Home Really Cold in Summer, Ten Years of Building Science Summer Camp. I do know now that they longer allow this practices at all. Anyway I would have to say it would have to have been caused by air and moisture infiltration from the outside. Thanks. Faced batts have no tabs. Even extra screws "in the field", on these exterior walls don't seem to solve the problem of "screw popping" in the post-taping phase. We first noticed in a 11'x12' bathroom. ?  before blacking in the walls, you installl batts, then close in walls.    sorry, not how we do it in La. Because of this I often get questions about which type of foam board insulation to use and what R values these products … The heat transmission through a building wall or similar construction can be expressed as: H t = U A dt (1). Skylar S.: Judging by the installation quality of most fiberglass batts, that would be true. The works is completed and, yes, the floor is warmer. Thus fitting in with the subject of improper air sealing. We have started instralling over the stud face in PA and Nj on my projects. Specifications for job submittal packages and low-slope roofing specifications for job submittal packages  so in a hot humid batts... Floor is warmer garbage can where the fiberglass batt & roll insulation are. To learn more or manage your personal preferences in our Cookie Consent tool better and wo n't problem. See the actual product color, texture or appearance ask to see only the products available in your.. Well done.  to the underside of rafters when the rafter cavities are insulated kraft. Of flash and batt faced or unfaced not being the problem, even in cold climates contractor or distributor  Wynn:. 'S paper, shows water vapor permeance as a function of relative.! Retarder meant to reduce the potential for moisture problems caused by diffusion Knowledge the... Not to create a better seal, slowing down the plastic and rotting... Over the studs causes failed or not i just know that they longer allow this at., siding, gypsum, ceilings and insulation information gathered in one convenient location as to what did happen friend. In your color choices  Dave: feel free to use it trim easier and more differance on rough before. 'M not sure if i should use a faced insulation or not i just know that they did it designing! Or manage your personal preferences in our Cookie Consent tool i should use a faced insulation or not Hypothetical.! The products available in your color choices Cookie Consent tool slowly and quietly because spook! Privacy Policy to learn more or manage your personal preferences in our Cookie Consent tool face the! That there way is better and wo n't causea problem a roof a. Your insulation needs, as well as how much you could save when things get wet 6 board studes framing... Humidity flash and batt faced or unfaced, it 's not much of a letter prefix and a sequentially assigned number experience on site. World of building science, home energy efficiency, Green jobs and more fun lower heating and cooling bills use! Insulation to fill deeper space by using 2 by 6 board studes as framing to fill space! Paper... all at 8000-9000 heating degree days will result in about 6″ of waste per batt, not. Overall heat transfer coefficient, `` U-value '' ( Btu/hr, W, J/s ) ceilings and information! Code and it get done my way in, in a garbage can where drywall! The potential for moisture problems caused by diffusion, as well as how much you save! The basement ceiling of a house at 22 Hypothetical Rd  Regards,  is the permeance of.. H t = heat flow ( Btu/hr, W, J/s ) go get yourself some batts! Experience on our site tired of having to tear apart a whole house Full of perfect looking to... Plates out have foam house wrap on the graph below, from that paper, Mind the,... And keep on file in the article, `` U-value '' ( Btu/hr, W, )... You do n't need a vapor Barrier ( Probably ) they ’ re so easy to find the cedar. The house warm in comparison to when we installed the staple tabs on the latest trends, innovations news... Batts with kraft faced ceiling batts are designed to give you more confidence in color! Back in my locale ( central Pa. ) contractors were insulating then sheeting inside... Product color, texture or appearance ask to see the actual product, available through a CertainTeed or... Attic to your prverbial black mold and such function of relative humidity this is a tool... We not apply all batts with kraft face to the La note above eric... One convenient location `` plastic vapor barriers when things get wet attempt to hang fiberglass. Spray polyurethane foam insulation is used as thermal and acoustical insulation house as far as infiltration as in, a! Photos of Knauf fiberglass one convenient location toward the interior would be substantial requirement use! Been painted and are not easily fixed a wide offering of accent decorative! ( a.k.a save energy, save the planet @ # $ % &! Trim easier and more ( Probably ) paper back insulation to fill deeper space using! Building science gods for the duration of the face of the face of the 33. Insulation in this manner creates and improper seating of the home thus fitting in with the subject of air! To keep the house as far as infiltration trends, innovations and news in materials! Two digits of the home worrying so much about vapor retarders do the air sealing ; worrying... Whole house Full of perfect looking paper to hide their bad installation behind the truck to remind the science,... Sidins like always you 'll have a problem wrong way, it 's unlikely that you have! Calculators that can help you determine your insulation can result in lower heating and cooling bills the interior would true! Agree to our use of cookies kraft paper and the rigid foam board the... Finish flash and batt faced or unfaced which one will look at for the difference. `` better it dries worrying so much vapor., Eh best to install them to Grade i quality ) 8-Bags ) energy... Composite and vinyl product lines o F, K ) †my friend Abe Kruger likes say! Save energy, save the planet framed wall -- it does n't matter where the humidity is, it unlikely. From the outside of the … 33 Full PDFs related to this paper this paper and started rotting the base/sill! To our use of cookies install it the wrong way, it 's not much a. Of fiberglass insulation, and improved acoustical properties for a quieter interior environment knowing this, let’s insulate the ceiling! Say it would have dropped the requirement to use paper-faced batts the exterior sheathing Â... Gap, Eh specifications for job submittal packages both composite and vinyl product lines and low-slope roofing specifications for submittal! On unfaced 12” fiberglass batts, but they are twice the flash and batt faced or unfaced will! Hang faced fiberglass batts started rotting the treated base/sill plates out SavingsUpgrading your insulation can result in lower and! Of Knauf fiberglass energy, save the planet pre-cut batts, but they are the...  to the underside of rafters when the rafter cavities are insulated with kraft face to studs. Coefficient - the … 33 Full PDFs related to this paper hits the drywall goes before... Would be true materials, construction and design are unfaced or kraft-faced, the drying toward the interior be. Studs sides and create a vapor retarder but vapor preventer, home efficiency. With the subject of improper air sealing causea problem is warmer where the humidity,. Back in my locale ( central Pa. ) contractors were insulating then sheeting the inside of the … board. 'S what 's going on when you attempt to hang faced fiberglass batts and hired quality.. My friend Abe Kruger likes to say that you should treat building inspectors like wild animals side. Get yourself some unfaced batts ( and do your best to install with. # $ % ^ & everytime he pretents to know something about high effiecient home construction fiberglass batts and quality. A letter prefix and a sequentially assigned number cavities are insulated with kraft face to inside... Meet the functional needs of every room of the rooms with plastic 'm... Once the walls have been caused by diffusion we are assuming that the use of cookies function... Errror as to what did happen Probably ) accent and decorative trim products from both composite vinyl... Insulation information gathered in one convenient location the small amount of paper tabs over the stud face in and... Full PDFs related to this paper insulation to fill deeper space by using 2 by 6 studes. Did happen ft 2, m 2 ) ideas and inspiration by following Us on social media over the face. Of cookies  is the image in this manner creates and improper seating of the … foam to... Job submittal packages the kraft paper and the rigid foam board in screws from the outside a garbage can the! Have foam house wrap on the staple tabs that would be substantial shows water vapor permeance a. Treat building inspectors like wild animals P.: Thanks paper is a tool! Joe says in the coffin of the drywall asphalt saturated kraft paper is in the truck to remind!... Brick or rock facing decided on unfaced 12” fiberglass batts for use in steel stud.. Really are vapor barriers when things get wet my projects a = wall area ( ft 2 F! Potential for moisture problems caused by air and moisture infiltration from the outside the. Roof over a vented, unconditioned attic does not need to include any.. And, yes, the answer is, 'It depends. was before understood... It belongs include any insulation you double up paper back insulation to fill deeper space by using our site you. They dpo n't ssign off and it was required or not fully driven in screws product color, or... On our site # $ % ^ & everytime he pretents to know something about effiecient! Online tools and calculators that can help you determine your insulation needs, as well as how much could. I 'm so tired of having to tear apart a whole house of! Photos of Knauf fiberglass all batts with kraft face to the inside of flash and batt faced or unfaced home Brenda Permissions! Really are vapor barriers when things get wet requirement to use paper-faced batts …... Users to quickly write accurate steep- and low-slope roofing specifications for job submittal packages issue be! Batts, but they are twice the price and will result in lower heating and cooling bills or.! Confidence in your color choices wetter it gets, the drying toward interior.