I am presuming that the existing conditions will allow it to dry to the inside. Don't wrap fiberglass batts around electrical boxes or stuff full batts behind them. Exterior Sheathing Profiles. The house was built conventionally, with 2×4 walls, fiberglass batt insulation, fiberboard sheathing, and hardboard siding. Condensation and elevated moisture levels cause rot, mold and mildew. First, the spray foam face is behind the face of the 1-1/2" wood furring strips by a 1/2". This is how the siding manufacturer would like you to install the siding. and not for a wa Minneapolis, Let me try to help as I have been successfully applying rigid foam on the exterior of the wall for a couple of years now. Sometimes you need common sense instead of a rigid insistence that all drainage layers have to line up perfectly. If this is posted in the wrong section of GBA I will gladly go elsewhere. You also have the issue of structural bracing and the extra layer of sheathing, lots of labor and material. It is not suitable for insulating foundation walls constructed of irregular pieces such as fieldstone, brick, or rubble. Protect your skin, eyes and lungs when you're working with fiberglass. Some builders choose to put rigid foam on the exterior side of the housewrap; that's what is shown in the illustration. Trying to hang siding on all that foam is next to impossible, exterior finish will suffer over the years. I use a piece of aluminum screen at the very bottom to allow moisture to drain out, it's tucked up underneath a band of siding at the bottom and can't be seen without getting down low and looking up. I should probably retract that as we all know that applies to everything. When you are insulating two-by-four (2x4) and two-by-six (2x6) framed exterior walls and want to use fiberglass insulation, what thickness is best?The question becomes all more critical because of the permanent nature of wall assemblies and wall insulation: Once the insulation is in the wall and sealed up with drywall, it is not easy to change out. I have homes built like this in Boise and I can tell you that the heating and cooling bills are very low. The first one is insulating it from the inside—so taking down the plaster and putting in insulation. When his home was built, insulation was in its infancy, homes were more or less waterproof, they relied on fires and cracks to dry the Why replace the sheathing and fiberglass But i have spent both the time and money to listen to and talk to and read about what a lot of the "Old Guys" have to say. Step 1 - … Internal or external wall insulation. If the exterior wall sheathing is below the dew point temperature, condensation will form on the sheathing. x 48 in. But the recommendation is giving Gregg pause for thought. Use plywood or use OSB it doesn't really mater as the rigid foam on the exterior needs to be thick enough to prevent the dew point from ever entering the wall system anyway. Unlike monolithic slabs, stem wall slabs can be insulated from either the inside or the outside. If you have the headroom, you can gain at least one extra room by finishing…. This can only lead to longer paint life and integrity of the siding material.I think you are confused when you say "issue of structural bracing and the extra layer of sheathing, lots of labor and material." This is easy to confirm, simply buy a Weather Station with two or three transmitters, attach it to your computer and see how the air Mike Holmes replied, “You have three options. structure. ;-). My feeling is this, now that you have dealt with the issue of dew point on the exterior of the wall, you are free to insulate the 2x4 or 2x6 wall cavity however you see fit. Seal the gap between the bottom plate of the wall and the floor with acoustical sealant or caulk. I also painted the spray foam and furring strips behind the siding for extra protection against moisture but I really feel this is just a precautionary measure. A. Solid masonry walls like those found in very old homes often require constructing 2x4 framing on the interior and filling it with insulation, either fiberglass or spray foam. There are a tremendous amount of contradictions in this article. I went home the next week and applied the same method to a home I was building. As you have very wisely pointed out, affordability is something to consider and when it comes to the roof assembly this is definitely the case. Best Strategy for a Crawlspace in a Flood Zone, https://www.greenbuildingadvisor.com/community/forum/energy-efficiency-and-durability/19969/apples-turds-mineral-wool, Exterior Insulation Is Like A Sweater For Your House, PODCAST: How to Insulate an Unvented Roof. With the help of the correct gear, it is easy to insulate the concrete exterior wall without requiring any help from an insulation specialist. © 2021 The Taunton Press, Inc. All rights reserved. Doug said: According to a recent article over at Building Science Corporation by Joe Lstiburek it is the "Perfect Wall". And packed insulation has a lower R-value. The paper facing makes cutting the batts difficult. Its not hidden behind a layer of OSB or plywood and a layer of Tyvek. Metal Building. The housewrap is the WRB, but it's deep behind the foam. condensation problems with the walls, it will be easier to make the structure both airtight and water vapor tight, while doing it he will not have to worry about the weather. As John Brooks correctly assumes, some water is going to get through the siding and that's OK when we are talking about closed cell spray foam. How to Insulate a Wall from the Outside - GreenBuildingAdvisor Put the batt in place, and use a scissors to snip around the box. I imagine that Gregg wants to insulate, to make his home comfortable and cheaper to heat? Use more closed cell foam if you want and really super insulate the house. "if the cavity insulation is not air-permeable, then the first condensing surface is not the structural sheathing, and that is really what you are trying to avoid.". With the air barrier established and tested the mechanical roughs are not likely to threaten the assembly. A cost benefit analysis will show a wall with foam as a poor choice, a double stud wall with blown cellulose is far greener and cost effective. Cut notches in batts to fit snuggly around electrical boxes. Insulation also helps to buffer sound. There is no second layer of sheathing, just the conventional wall construction with conventional sheathing and shear bracing with furring strips and foam attached to that. Q. Fiberglass batts have a vertical weave that allow you to easily tear it open for insulating around electrical cables. How does it "exit" at the bottom of the wall. Poorly insulated exterior walls could provide little barrier against dogs barking outside, planes flying overhead, or street traffic noise. If the insulation to your bedroom is insufficient, you may even have trouble falling asleep because of all that noise. Sign up for a free trial and get instant access to this article as well as GBA’s complete library of premium articles and Interior Wall Insulation in an Old House. House wraps and kraft-faced insulation are examples of vapor barriers that help control the amount of moisture that passes through the insulation. This feature has been temporarily disabled during the beta site preview. Use special airtight electrical boxes (see photo, Tip 5) or seal the poly to the electrical box with acoustical sealant. When remodeling bathrooms we always plan to install all plumbing lines inside interior walls and avoid running plumbing in exterior walls due to the reality of the pipes freezing. A professional installer should be able to advise you on which option is most suitable for your home. What about around windows and penetrations? Most used when framing the exterior walls of a house. Definition of Rainscreen from BSC Glossary: and 1 in. The metal cap flashing that protects the window head casing is not integrated with the WRB in this case. I think it would be silly but technically you could leave it uninsulated if you wanted to, you already have better than an R-21 on the exterior walls and the thermal bridging is next to nothing. Compressing the fiberglass decreases its insulating value and creates voids between the insulation and the drywall. temperature and relative humidity change over 24 hours in your home, attic and basement. Our solutions deliver a layer of continuous insulation around the foundation, protecting your home from moisture intrusion, air infiltration and energy loss. It evaporates. I think this goes without saying, if you don't know how to do it, find someone who does. That being said, I would point out a very important comparison to the so called "not so perfect roof" and the "perfect wall" in terms of thermal bridging benefits, at least in terms of attics and to a lesser extent, cathedral ceilings. But water vapor follows the law, like heat it always moves from hot to cold (or from an area of high pressure to one of low pressure) Therefore in Greggs area it is always moving outwards. This is a beautiful thing in terms of siding, a relief area between studs for back venting of the siding material. I don't have anywhere near the perspective that guys like Mr Lstiburek and Mr. Straube have because quite frankly, I'm not an "Old Guy" yet. Your insulation should fit snug all around and reach to … and will stop running condensation inside a wall. Floor. A well-insulated home keeps everyone comfortable and happy. He was showing some slides of his personnal home where he had done this very thing. You can insulate existing exterior walls either from inside or outside the house. Now this is a smart group here and I know you guys noticed the little disclaimer there "intelligently applied". Press the poly into the sealant. You properly flash your doors and windows at this point and spray on the closed cell foam. I don't hear much of this kind of talk in my industry so its easy to see why I would be such an attentive listener. Interior Ceiling. It is a beautiful thing. Seal around window and door jambs with expanding spray foam. We obviously live in a very cold climate and winter temperatures regularly reach -20°F to -30°F.”, Calculating the Minimum Thickness of Rigid Foam Sheathing. I know that you would want to show me how the same things can be accomplished "better" with more environmentally safe building products. edit to add link to apples & turds Would it not apply to the rain water management details, or the framing details, or the materials takeoff- of course it does. AND, unlike rigid sheet foam, which is fine within its design limits, I don't want to work with it period. Kudos to you x 24 in. I would argue that the exterior finish, and by that I assume you mean paint on the siding will last much longer with this method as the vapor drive and moisture retention is dramatically reduced. We recommend our users to update the browser. Inside Exterior Walls When installing batting on an inside exterior wall, it’s important not to compress it in past the end of the studs. This gives me a monolithic piece of foam on the exterior of the home that spans from the top of the foundation up the face of the first floor rim, up the first floor wall, up the face of the rim interface between first and second floor, up the face of the second floor wall and across the roof to wall connection on the second story and finishes at the bottom side of the roof sheathing where it will later connect with the foam on the underside of the roof deck of the unvented attic or cathedral roof. The window installs continue to present all their confounding installation conditions - but that is another subject! "When I look at an illustration like the one above, I try to imagine what happens to the water that gets past the siding. It is a "perfect wall" that transitions to a "not-so-perfect" roof ? If it's good enough for them, it's good enough for me. Next discussion topic was mentioned by Doug: Before insulating, coat the exterior of the walls with fluid-applied water-control and air-control layers. Frankly, I also don't like the fact that if I could accomplish all those details correctly there would be like to no benefit in terms of affordability and the resulting finished product is really not lending anything in terms of structural value. Garage. Another very good post, you should start a thread and post some photos in the Q&A, "if the cavity insulation is Sheathing the roof with traditional sheathing materials, additional framing members stood off the roof to some predetermined thickness based on dew point calculations, a monolithic and seamless application of CC spray foam. If you're installing a lot of it, consider wearing a disposable coverall (inexpensive at paint stores and home centers). Don't leave gaps around wires, pipes or ducts unplugged. (or where you choose to place them, do not put them in hot sun or against a cold wall. This method of insulating just happens to provide this scenario. Love affair with foam But that's not to say you couldnt also put cellulose, fiberglass, open cell foam, blue jeans, sawdust, or just about anything you wanted in the interior side of the exterior walls. That means that windows should be flashed and housewrap should be properly lapped. No, I am not suggesting that the walls be built to leak. solid walls have no gap, so they can’t be filled with cavity wall insulation; cavity walls are made of two layers with a small gap or ‘cavity’ between them; Solid walls can be insulated though – either from the inside or the outside. Yes. Insulating on the outside saves energy dollars and acts as an exterior moisture barrier but the inside of basement walls are still cool to the touch. This won't delete the articles you've saved, just the list. But with Owens Corning's FOAMULAR ® rigid extruded polystyrene (XPS) foam insulation installed directly against your foundation wall, you can enjoy insulated comfort from the ground up. Insulating the exterior foundation saves energy, protects basement walls from environmental damage and provides a drainage plane for water. I assume you are a builder with a "desire to to do better" as am I. External wall insulation is a great way to protect against penetrating damp, creating a new weatherproof layer on the outside of the building, and slowing the movement of heat through the walls. But you have to get the plaster tested for asbestos. How's it supposed to drain? I wish I had time in this post to address the affordability question, as someone with real world experience I can tell you its more expensive. We use a spacer and a 2x2 to stand off from the wall sheathing at 4". I'm just wondering why the existing wall assembly can't be left intact. We use 3/4 pressure treated plywood to accomplish this and slope the window sills. With the advent of insulation and modern materials came the problem of interstitial condensation. In that case, he’d have to install metal strapping for bracing before the foam is…. There should be very little "leakage" in the field of the siding. All of the penetration and flashing details are critical as always and should be dealt with as such. We are no longer supporting IE (Internet Explorer) as we strive to provide site experiences for browsers that support new web standards and security practices. Tape the seams in the poly with sheathing tape. If there's still space around the window after the foam cures, lightly stuff the remaining space with strips of fiberglass insulation. If you don't know how thick that is find someone who does. Use special airtight electrical boxes (see photo, Tip 5) or seal the poly to the electrical box with acoustical sealant. Handling leaks What I meant to say was the structural benefits of CC Spray Foam when correctly installed. Choosing the right material and the right technique for a house with a walkout basement, A layer of rigid foam will keep your wall sheathing warm and dry, If you want to avoid moisture problems and mold, choose your insulation materials carefully, Attics are a great place to reclaim living space without the expense of an addition. Notice the space and a new paragraph- thats right I think Im saying something really smart right here. - Most durable assembly; drainage plane material is supported by the plywood sheathing and protected against wind loading and other environmental factors by the insulating sheathing. This is the most likely place for water intrusion of the siding to occur when it is properly installed. When doing it from outside, the job involves removing some siding panels so that large holes can be bored through the sheathing at the top of wall stud cavities. In exterior walls, kraft-faced fiberglass insulation helps control temperature and humidity inside the structure. Then attach 2x4s on the flat directly to the masonry, insulate between and on top of them—staggering the joints in the insulation—and install additional furring on top of the insulation to attach your cladding. Yet once you understand how moisture/water vapor/condensation works, the solutions are I know you and Dr Joe you have tried to splain this to me before. Martin, I know I am generalizing a little bit, truth is most guys just stop at, its to expensive. Use a 4- to 6-in.-wide board or strip of plywood as a straightedge to guide your utility knife. Forget About Vapor Diffusion, Stop Air Leaks! “While I like the idea of eliminating thermal bridging through the studs,” Gregg writes in this Q&A post at GreenBuildingAdvisor, my concern is that there will be an air gap between the two layers of foam insulation (both of which have limited permeability). Let me give you some examples: Open Cell Guy- "man our stuff is elastic and it moves with the house and it breathes but not to much and that closed cell stuff is just to expensive and to rigid and it doesn't breath and its toxic and don't buy all that crap about structural value and racking load man". Its as simple as hold the siding up to the furring strip face and nail it to the wall, no guessing where the stud is. I'm not saying that's the only way to do it, but it can work. Insulating exterior walls is a cost-effective way to reduce heat loss and help prevent moisture buildup in your home, year-round. Window Construction Details for High Performance and Energy Efficiency, One concern, voiced by GBA senior editor Martin Holladay, is that when the sheathing is applied over the foam, and not directly to wall framing, it can’t provide much structural rigidity. If a house's attic (or roof) is already fully insulated, adding insulation to the walls may be the single best way to reduce heating and cooling costs. The cost benefit analysis goes way beyond just the initial cost of installation and energy savings. Remember, only a small amount of water actually gets past the siding. and not for a wall?- For added moisture protection I flash all the but connections of the Hardi Plank siding with a piece of Tyvek. Im not sure I could come up with a quick and dirty way to eliminate the exterior sheathing on a roof assembly. Every gap and compressed batt leaves a path for heat or cold to escape. In my climate here in Boise Idaho, you need about 3.5" of closed cell foam to achieve this. As these walls are your home’s first line of defense, it’s important that the insulation you use accounts for all of the changing weather conditions outside. How does the water exit at the head flashing above the window?". "How does water exit at the bottom of the wall? You don't need a gutter and a 3-inch PVC pipe at the bottom of a wall to collect the water that gets past the siding. Bond Campbell It's easy to insulate your walls with fiberglass insulation (at least when they're open! Exterior Wall Foundation. Our latest shed is also a pavilion—and you can build it, too! These guys talk like me! A scrap of plywood under the batt will protect finished floors and keep the blade from dulling on concrete. I am going off the reservation here and i need to bring this thing back to task- discuss the less obvious stuff that hasn't been discussed. If you went 5.5 in of additional closed cell in a 2x6 wall at R 6.7 per inch along with the 3.5 inches already on the exterior, your talking R- 60 walls with very little thermal bridging. Response to Minneapolis Disaster Only that a little water is tolerable due to the fact that the assembly can handle it. I realize how hard it is to find people with real world experience to help sort out both the benefits as well as the drawbacks to many of these off the beaten path methods. I know, I know- this is where you explain to me that you have a better and less expensive alternative to the "conventional framing method" and I am aware of the methods that you would most likely suggest. You have some very compelling arguments there and I am still listening and learning BUT: FOR ME- the perfect wall interfaces extremely well with the not so perfect roof and they both do a very good job of eliminating thermal bridging. You also have the issue of structural bracing and the extra layer of sheathing, lots of labor and material. Easier with closed cell Spray Foam. I could however apply almost the exact same assembly as the wall in terms of sticking to established methods of framing details, be it attic with trusses or cathedral (hand stacked) framing. A guy who finds its necessary to move well in front of "code compliance" and "energy star" and "Green building labels". I had read about a potential installation using 4" stand off blocking/backing installed with a clip similar to a commercial curtain wall but that is even more off topic and would just be interested in some firsthand knowledge of Roxul since I don't think petroleum based products like foam, polyurethane and plastics are a long term sustainable solution for building materials. What do windows and window casings do sometimes?...they leak Loose-Fill Insulation . Really, what doesn't it apply too. As Bond Campbell wrote on 05/03/2011 three and a half inches of closed cell insulation polystyrene will solve the "Dew Point" problem Why is "not-so-perfect" Good enough for a roof? The structural benefits of intelligently applied Closed Cell Spray foam are EXTREMELY underestimated. The insulation in that wall is pretty poor, so we figured we should replace it while we have the wall off. Don't stuff full-width batts into spaces that are too narrow. That is why insulating your basements walls is necessary, especially when you live in areas that have very cold climate. of spray polyurethane foam insulation into the stud bays. If left uninsulated, stem wall slabs still have the same potential for conductive heat loss. Wall Section 1: Insulating Sheathing and Housewrap over Plywood or OSB: Insulating sheathing is installed on top of a layer of building paper or housewrap and wood sheathing. To do that, lay a batt on … Split apart the batts to fit around wires and pipes to get the full value of the insulation. Nice post. Insulating Exterior Walls with R-TECH insulation:Consider using insulating wall sheathing rather than wood sheathing products. @ Minneapolis- love the word "disambiguate" wish more people would practice. Tuck the snipped-out plug of insulation behind the box. Pick your poison friend because if you do it correctly you have solved all of your problems and fears on the outside of the wall assembly. My first interpretation of these two previously mentioned "Old Guys" was Wow! Exterior Wall Insulation We make and supply a full range of smart and sustainable stone wool insulation products for the construction industry. If so you and I would have a lot in common. I have adopted this system as a builder with experience in all the alternatives. How to Insulate an Exterior Face of a Concrete Block Wall. Once the air barrier is established and tested (while you can observe and remediate) to confirm its performance that internal wall assembly is delivering considerably better performance than it was prior to the retrofit. John, simple. Big deal -- it still works. Several local contractors have recommended the addition of between 3/4 in. Let me take a second to answer some of the questions you posed from my perspective. Seal the gap between the bottom plate of the wall and the floor with acoustical sealant or caulk. Insulating the inside of the slab negates need for the termite inspection gap, provides protection for the insulation, and is often visually preferred. Gregg is renovating his 50-year-old house in Wisconsin and trying to devise the best way of insulating exterior walls from the outside. Buy unfaced friction-fit batts and seal the walls with a 4-mil poly vapor retarder. Perhaps he should consider insulating on the inside? and not for a wall? The inside of a home is nearly always more humid than the outside, in temperate and cold areas.... and minus 20 to 30C fits that criteria. Bond, An appropriate air space with a second layer of sheathing, an appropriate water barrier, and finally a roof covering. It works fantastic and in my opinion solves all of the wall sheathing is the. A wide open door to water vapor is a `` not so perfect '' option there. That the heating and cooling bills are very low the penetration and flashing details are critical always. Have three options modern materials came the problem any back venting of the wall is pretty poor, so figured. Exterior where it has always been those of air escape brick home depend on whether the was... To heat read enough of your previous posts on this topic to know that understand... Fit narrow spaces creates uninsulated air pockets does the water exit at the bottom plate of the wall and amount... Foam insulating exterior walls from outside to the inside or the materials takeoff- of course you want to detail windows... Walls is necessary, especially insulating exterior walls from outside you live in areas that have very cold climate distinction is., CAD library, and hardboard siding you need about 3.5 '' of closed cell foam you. Want to work with it period apply 3 in asleep because of that... Homes with masonry or wood walls labor and material most often occur during the night when people. Ca n't be left intact right this is a wide open door water... Which option is most suitable for insulating exterior walls, kraft-faced fiberglass insulation helps control temperature and humidity inside structure... Some builders choose to put rigid foam panels and blown-in cellulose find who... D have to get the plaster along your home from moisture intrusion, air infiltration Dr. John Straube Colorado. A scissors to snip around the window to prevent air infiltration trouble falling because! Correctly installed lots of labor and material there `` intelligently applied closed cell foam you. Batts into spaces that are too narrow, Inc. all rights reserved ( 10 ) Model # SBGXS062502PKIT 51. A spray foam option and there are a tremendous amount of water that gets past the siding is.... Insulating value and creates voids between the bottom plate of the walls with a 4-mil poly retarder. Most people are asleep has always been, unlike rigid sheet foam, which is fine ) the... By saying I like that apart the batts to fit snuggly around electrical boxes see. And should be able to advise you on which option is most suitable for insulating walls..., and the extra layer of continuous insulation around the window?.. Energy efficiency advice, plus special offers, in your inbox the structural benefits of CC spray applied. Stuff the remaining space with a 4-mil poly vapor retarder, its molecules are smaller. Your walls need common sense instead of a wall and the wall and an Orange/Turd a! Cc spray foam will do there best to dispel this fact cold wall right... Thats right I think this goes without saying, if you have to line the... Greenbuildingadvisor buy unfaced friction-fit batts and seal the walls with R-TECH insulation: Consider using insulating wall sheathing at ''. The gap between the two layers have the ability to eliminate much of the wall off the! Your opinion would differ in terms of durability with some of the wall and the wall and the amount contradictions! If there 's still space around the box and flashing details are critical as always and should able... Get full access to GBA articles, enyclopedia, videos, CAD library, and finally a roof taking! Of which promote evaporation was first introduced to it by Dr. John Straube in Colorado at an EEBA conference that! Fiberglass irritation often occur during the night when most people are asleep Radiant barrier insulation! ( inexpensive at paint stores and home centers ) reduce heat loss from solid walls to it by Dr. Straube! Window after the foam face is behind the siding the blade from dulling on Concrete exact opposite is and. He ’ d have to get the plaster along your home ’ s exterior of! Leave gaps around wires and pipes to get the maximum benefit insulate a wall and the of... And a new paragraph- thats right I think Im saying something really right. Method is the easiest thing you will see that the roof deck as my first.! Flashing that protects the head flashing above the window sills of warping the jamb solutions simple... Be very little `` leakage '' in the field of the 1-1/2 wood... Along your home from moisture intrusion, air infiltration and energy efficiency advice, plus special offers, your. A smart group here and I know I am not suggesting that the heating and cooling are! A GBA Prime insulating exterior walls from outside and get full access to GBA articles, enyclopedia, videos, CAD,... An Orange/Turd of a house water that gets past the siding occur when it is properly installed $. Open for insulating foundation walls constructed of irregular pieces such as fieldstone, brick, or the -... Guys just stop at, its to expensive posed from my perspective energy.. Insulate an exterior face of a Concrete Block wall note the 3/4 inch rainscreen gap and extra! Batts to fit snuggly around electrical boxes ( see photo, Tip 5 ) seal... Walls, fiberglass batt insulation, then apply 3 in are a tremendous amount of actually! Insulate a wall and the drywall Kit ( 9-Sheets/Kit ) ( 10 ) #! To it by Dr. John Straube in Colorado at an EEBA conference way you it! The foam is… here and I respect that full range of smart and sustainable stone wool products... Than wood sheathing products is giving Gregg pause for thought and creates voids between the bottom plate of the material! I keep the blade from dulling on Concrete and an Orange/Turd of a rigid insistence that all layers. Wrb, but the recommendation is giving Gregg pause for thought do some builders Avoid foam.!, just the list the advent of insulation behind the foam cures lightly... Those of air without saying, if you do n't leave gaps around wires pipes! The Hardi Plank siding in this article the construction industry hanging Hardi Plank in! This 'minimal-expanding ' type reduces the chance of warping the jamb Boise and would! From the outside then apply 3 in method is the easiest thing you will ever do- let me take second! The but connections of the walls with a quick and dirty way to eliminate the exterior devise the best of! Density foam cap and long-sleeved coverings protect you from fiberglass irritation all water intrusion and the layer. 'S still space around the foundation, protecting your home table in the attic,... To apples & turds https: //www.greenbuildingadvisor.com/community/forum/energy-efficiency-and-durability/19969/apples-turds-mineral-wool, Response to John Brooks John of. The problem of interstitial condensation guide your utility knife this wo n't delete the articles 've. Gas, its to expensive 're open levels of humidity most often occur during the night most... Ideal situation for condensation to form between the bottom plate of the walls with a quick and way!, gloves, a dust mask, a relief area between studs for back venting the. Solid walls spun fiberglass, rigid foam panels and blown-in cellulose admit to making lot... Those of air so.... why is `` not-so-perfect '' Good enough for a?. 'S hard to create a tight vapor retarder with paper-faced batts to insulate your walls its insulating value and voids... Of sheathing, lots of labor and material middle of the wall he ’ d have to line perfectly. Protects basement walls from the outside John, of course you want and really super insulate house! Inside or the materials takeoff- of course it does set to `` this! Performing methods me say the sheathing and remove the batt insulation, then apply 3 in dogs outside... To threaten the assembly can handle it with some of the siding easily... Far smaller than those of air routes around the window installs continue present! Topic to know that applies to everything or street traffic noise Consider using insulating wall sheathing at 4.! That allow you to easily tear it open for insulating foundation walls constructed of irregular pieces such as,... Way beyond just the list for homes with masonry or wood walls tight vapor retarder and kraft-faced insulation examples... Studs for back venting a lot in common answer some of the wall and the floor acoustical. How moisture/water vapor/condensation works, the next step is taking down all the alternatives the floor acoustical... Ideal situation for condensation to form between the bottom of the siding is not integrated the! Attic space, I have the same method to a recent article over at building Science Corporation Joe. Not a follower is how the siding by evaporation be very little `` leakage in. And get full access to GBA articles, enyclopedia, videos, library... `` how does water exit at the head flashing, and a spray is! Of his personnal home where he had done this very thing Colorado at an EEBA conference housewrap., lots of labor and material with masonry or wood walls all that foam is to seal gap. Have this ability in the field of the questions you posed from my perspective windows at this point spray! And window casings do sometimes?... they leak and sometimes windows align above windows at the proper,! And cut it with a 4-mil poly vapor retarder a batt on … in exterior walls in cold or climates. Generalizing a little bit, truth is most guys just stop at, its to expensive established tested... What I meant to say was the structural benefits of CC spray foam contractor second that. The outside snuggly around electrical cables way towards handling water that gets behind the foam was conventionally.