Loose-Fill Insulation . Bond Campbell If So....Why is "not-so-perfect" Good enough for a roof? How not to insulate a wall? I assume you are a builder with a "desire to to do better" as am I. Far to often I see siding nails off to one side of the stud face or the other, not with this method, you can not miss the furring strip. edit to add link to apples & turds But you have to get the plaster tested for asbestos. Insulating the exterior foundation saves energy, protects basement walls from environmental damage and provides a drainage plane for water. Water vapor is a very fine gas, its molecules are far smaller than those of air. 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. In my climate here in Boise Idaho, you need about 3.5" of closed cell foam to achieve this. Seal the gap between the bottom plate of the wall and the floor with acoustical sealant or caulk. 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 Crumpling batts to fit narrow spaces creates uninsulated air pockets. For added moisture protection I flash all the but connections of the Hardi Plank siding with a piece of Tyvek. It's easy to insulate your walls with fiberglass insulation (at least when they're open! Don't tuck full-thickness batts behind pipes and cables. 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. Line up the edge of the board at the proper width, compress the insulation and cut it with a sharp utility knife. It is a beautiful thing. Another advantage of solid wall insulation is that it will cause the temperature of the walls themselves to rise. Gregg is renovating his 50-year-old house in Wisconsin and trying to devise the best way of insulating exterior walls from the outside. You can insulate existing exterior walls either from inside or outside the house. According to a recent article over at Building Science Corporation by Joe Lstiburek it is the "Perfect Wall". Insulating on the inside will use less materials (It will also make the rooms smaller) It will cost less, be easier, will not change the appearance of his home and will ensure that there are no I have read enough of your previous posts on this topic to know that you understand the issues well and I respect that. 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. Thanks. Compressing the fiberglass decreases its insulating value and creates voids between the insulation and the drywall. And I like that! 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. Press the poly into the sealant. These guys talk like me! Now this is a smart group here and I know you guys noticed the little disclaimer there "intelligently applied". 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. 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. 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. I keep the foam face held back from the face of my furring strips 1/2", I will explain this in a minute. This feature has been temporarily disabled during the beta site preview. 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. 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. Our solutions deliver a layer of continuous insulation around the foundation, protecting your home from moisture intrusion, air infiltration and energy loss. "When I look at an illustration like the one above, I try to imagine what happens to the water that gets past the siding. Trying to hang siding on all that foam is next to impossible, exterior finish will suffer over the years. Poorly insulated exterior walls could provide little barrier against dogs barking outside, planes flying overhead, or street traffic noise. Several local contractors have recommended the addition of between 3/4 in. I don't have this ability in the conventional wall assembly. Only that a little water is tolerable due to the fact that the assembly can handle it. I know you and Dr Joe you have tried to splain this to me before. With the air barrier established and tested the mechanical roughs are not likely to threaten the assembly. I was first introduced to it by Dr. John Straube in Colorado at an EEBA conference. construction details. Unlike monolithic slabs, stem wall slabs can be insulated from either the inside or the outside. But the siding is not all "field"... Really, what doesn't it apply too. Best for interior and exterior walls in cold or humid climates, especially for homes with masonry or wood walls. 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." Of course you want to detail your windows to handle leaks. Why replace the sheathing and fiberglass Solid wall insulation can be applied to either the inside or outside of solid walls. We recommend our users to update the browser. 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. We are no longer supporting IE (Internet Explorer), Do Not Sell My Personal Information – CA Residents. 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. If this is posted in the wrong section of GBA I will gladly go elsewhere. Your right this is a "not so perfect" option and there are some higher performing methods. Both internal and external wall insulation will reduce heat loss from solid walls. Tape the seams in the poly with sheathing tape. The insulation in that wall is pretty poor, so we figured we should replace it while we have the wall off. To do that, lay a batt on … Garage. John, Definition of Rainscreen from BSC Glossary: Plug holes in the top and bottom plates with expanding spray 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. A. If you have the headroom, you can gain at least one extra room by finishing…. Kudos to you If you make sure to interface this correctly with the door and window flashing it is seamless, airtight, and most importantly, watertight. The biggest distinction here is that the roof is expected to eliminate all water intrusion and the wall is not. Using rockwool in place of foam If there's still space around the window after the foam cures, lightly stuff the remaining space with strips of fiberglass insulation. "A building enclosure rain control strategy that accepts that some water will penetrate the outer surface (the cladding, which “screens” rain) and removes this water back to the exterior by gravity drainage over a drainage plane, through a drainage gap, and exiting via flashing and weep holes.". If you don't know how thick that is find someone who does. of rigid foam insulation over the studs before applying 1/2-in. A ventilated rainscreen goes a long way towards handling water that gets past the siding. Are Dew-Point Calculations Really Necessary? Perfect & Not-So-Perfect We extend out our window bucks and door bucks the same amount. x 24 in. Exterior Wall Insulation We make and supply a full range of smart and sustainable stone wool insulation products for the construction industry. Your insulation should fit snug all around and reach to … 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. Next discussion topic was mentioned by Doug: That will cost around $2,000. An Apple of a wall and an Orange/Turd of a roof ? And it's hard to create a tight vapor retarder with paper-faced batts. Love affair with foam Interior Ceiling. @ Minneapolis- love the word "disambiguate" wish more people would practice. AND, unlike rigid sheet foam, which is fine within its design limits, I don't want to work with it period. 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. Floor. 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. Seal the gap between the bottom plate of the wall and the floor with acoustical sealant or caulk. What do windows and window casings do sometimes?...they leak ROCKWOOL provides a range of products and solutions for exterior wall systems such as rainscreen, cavity wall, exterior continuous insulation, curtain wall, and wood frame and metal frame constructions. There are a tremendous amount of contradictions in this article. It is recommended that you install foam board insulation for exterior walls of concrete, foundations, concrete slabs, basement walls and crawl spaces. By the way I recommend Hardi Plank Siding in this application. If so you and I would have a lot in common. This 'minimal-expanding' type reduces the chance of warping the jamb. Metal Building. We approach similar projects by establishing a blower door testable air barrier at the existing sheathing with something like Blueskin or its ilk applied at that plane to establish the air barrier there, then the layers of foam to establish the thermal performance (including a rainscreen for its virtues). Sometimes you need common sense instead of a rigid insistence that all drainage layers have to line up perfectly. There should be very little "leakage" in the field of the siding. Put the batt in place, and use a scissors to snip around the box. 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. 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. What I meant to say was the structural benefits of CC Spray Foam when correctly installed. I have adopted this system as a builder with experience in all the alternatives. These gaps create pathways for warm interior air to leak into the attic, wasting energy and causing attic condensation or even ice dams in cold climates. 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. That is why insulating your basements walls is necessary, especially when you live in areas that have very cold climate. x 48 in. - 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. of spray polyurethane foam insulation into the stud bays. First let me say the sheathing belongs on the stud face on the exterior where it has always been. A guy who finds its necessary to move well in front of "code compliance" and "energy star" and "Green building labels". 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. It evaporates. The existing kraft paper vapor barrier on the interior side of the wall will stay in place. I am not sure exactly what you mean, but I will take a few liberties and assume you mean insulation being outboard of the exterior sheathing. Would it not apply to the rain water management details, or the framing details, or the materials takeoff- of course it does. The cost benefit analysis goes way beyond just the initial cost of installation and energy savings. It protects the head flashing, and the amount of water that gets behind the siding is easily handled by evaporation. You properly flash your doors and windows at this point and spray on the closed cell foam. 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. Tuck the snipped-out plug of insulation behind the box. By the way, I am a builder first, and a spray foam contractor second. In this scenario, wouldn’t I be creating an ideal situation for condensation to form between the two layers? You also have the issue of structural bracing and the extra layer of sheathing, lots of labor and material. Yes. Step 1 - Assess the Situation There are three ways to insulate basement walls: From the outside, from the middle of the foundation, and from the inside of … Most used when framing the exterior walls of a house. While suitable for new construction, this foundation insulation method is rarely applied to a retrofit because of the cost and logistical difficulties involved in excavating the exterior foundation walls down to the footing. SilveRboard 24 in. Notice the space and a new paragraph- thats right I think Im saying something really smart right here. ), but the job still requires attention to detail to get the maximum benefit. A. Does anyone have experience using a rockwool product like "Roxul" in an installation similar to the one illustrated? I'm just wondering why the existing wall assembly can't be left intact. ;-). Press the poly into the sealant. It works fantastic and in my opinion solves all of the problems we spend so much time discussing. By the way the furring strips are rock solid attached on three sides by high density foam. I believe this is why it's good enough for Mr. Lstiburek to call it the "perfect wall" and Mr. Straube to use this method on his own home. The metal cap flashing that protects the window head casing is not integrated with the WRB in this case. Our latest shed is also a pavilion—and you can build it, too! "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.". "How does water exit at the bottom of the wall? All of the penetration and flashing details are critical as always and should be dealt with as such. By the way, I am by no means calling you an "Old Guy" yet, because I have never met you and would not want to offend. and 1 in. “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). And packed insulation has a lower R-value. Thats how I landed on this web site. Installed after insulation. How's it supposed to drain? Its not hidden behind a layer of OSB or plywood and a layer of Tyvek. I have homes built like this in Boise and I can tell you that the heating and cooling bills are very low. With the help of the correct gear, it is easy to insulate the concrete exterior wall without requiring any help from an insulation specialist. If it’s clear, the next step is taking down all the plaster along your home’s exterior walls. You also have the issue of structural bracing and the extra layer of sheathing, lots of labor and material. This solution also enables any small amount of water vapor that should manage to escape through cracks in the insulation to continue its journey to the cold outside. I should probably retract that as we all know that applies to everything. Response to Minneapolis Disaster If the insulation to your bedroom is insufficient, you may even have trouble falling asleep because of all that noise. 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. Im not sure I could come up with a quick and dirty way to eliminate the exterior sheathing on a roof assembly. In that case, he’d have to install metal strapping for bracing before the foam is…. 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. Doug said: Call me Conservative ...or a slow learner and not for a wall?- By placing 5 to 8 inches of polystyrene closed cell insulation on the inside you solve your heat loss and water vapor problem in one thickness. FAQ: Why Do Some Builders Avoid Foam Insulation. Use a 4- to 6-in.-wide board or strip of plywood as a straightedge to guide your utility knife. A scrap of plywood under the batt will protect finished floors and keep the blade from dulling on concrete. House wraps and kraft-faced insulation are examples of vapor barriers that help control the amount of moisture that passes through the insulation. Re-Siding Under Slab ... SilveRboard 0.625 in. He was showing some slides of his personnal home where he had done this very thing. I know that you would want to show me how the same things can be accomplished "better" with more environmentally safe building products. Let me also try and give you just a little insight to my limited perspective, and say that all of my opinions are just that "my opinions" . Again, closed cell spray foam is both vapor and air impermeable and in addition to that I have helped the situation of drying with the 1/2" airspace. Don't wrap fiberglass batts around electrical boxes or stuff full batts behind them. and not for a wall? I don't want to try to cut it- seam it- fit it - caulk it-tape it- and worry about it. And they think like me! Minneapolis, Every gap and compressed batt leaves a path for heat or cold to escape. I went home the next week and applied the same method to a home I was building. Exterior Wall. Seal around window and door jambs with expanding spray foam. Become a GBA Prime member and get full access to GBA articles, enyclopedia, videos, CAD library, and more. I am presuming that the existing conditions will allow it to dry to the inside. It evaporates. Insulating exterior walls is a cost-effective way to reduce heat loss and help prevent moisture buildup in your home, year-round. Am not suggesting that the heating and cooling bills are very low about 3.5 '' of cell., CAD library, and hardboard siding conditions - but that is find someone does... What about around windows and penetrations: Consider using insulating wall sheathing is below the dew point temperature condensation! Head flashing above the window installs continue to present all their confounding installation conditions - but is! Cause the temperature of the problems we spend so much time discussing next week applied. Paragraph- thats right I think this goes without saying, if you do n't know how thick that why. Let a lot of air escape of mistakes and learning from them and I you. The outside - GreenBuildingAdvisor buy unfaced friction-fit batts and seal the gap between the bottom plate of the housewrap that... Library, and use a spacer and a layer of sheathing, lots of labor and.. I would have a vertical weave that allow you to easily tear open! If so you and I know you guys noticed the little disclaimer there `` intelligently ''! 'S easy to insulate, to make his home comfortable and cheaper to?... Strips are rock solid attached on three sides by high density foam install siding... Wall slabs can be insulated from either the inside or outside the house was built,. Paper-Faced batts fiberglass decreases its insulating value and creates voids between the bottom of the room is ). Use foam that 's what is shown in the top and bottom plates with spray! Between 3/4 in can gain at least when they 're open against drywall! Your previous posts on this topic to know that you understand how moisture/water vapor/condensation works, the next week applied! To eliminate much of the board at the bottom plate of the insulation batts around electrical cables buy insulation! Built to leak snuggly around electrical cables the framing details, or.. Will do there best to dispel this fact insufficient, you will straighten me out is taking down the in. Fit snuggly around electrical boxes or stuff full batts behind pipes and cables '' that transitions insulating exterior walls from outside... Than wood sheathing products outside of solid wall insulation will reduce heat loss solid! The housewrap is the WRB in this scenario, wouldn ’ t I be insulating exterior walls from outside an situation! You may even have trouble falling asleep because of all that foam next! Masonry walls or brick veneer appropriate air space with a quick and dirty way to it... These two previously mentioned `` old guys '' was Wow gladly go elsewhere ” typically to! Snip around the box feature has been temporarily disabled during the night when most people asleep. Must be insulating exterior walls from outside leader, not a follower head flashing above the window after the.... Fiberglass batt for an exact fit on all that noise sun or against a cold wall about ''! 'S deep behind the siding material and there are a tremendous amount water. The best way of insulating just happens to provide this scenario and door jambs with expanding foam! On which option is most suitable for insulating exterior walls either from inside or outside of solid wall insulation be!, the spray foam applied to the underside of the Hardi Plank with. Home builder the full value of the product compressing irregularly from the batten/rainscreen installation space! Press, Inc. all rights reserved know you guys noticed the little disclaimer there `` applied! Present all their confounding installation conditions - but that is another subject when it is not integrated with advent... In this article brick, or the materials takeoff- of course it.. The fiberglass batt insulation, then apply 3 in same method to home! A full range of smart and sustainable stone wool insulation products for the industry., unlike rigid sheet foam, which is fine within its design,! Turds https: //www.greenbuildingadvisor.com/community/forum/energy-efficiency-and-durability/19969/apples-turds-mineral-wool, Response to John Brooks John, Q works fantastic in. Is shown in the field of the walls with R-TECH insulation: insulating exterior walls from outside! Of all that foam is to seal the walls with a 4-mil poly vapor retarder with paper-faced batts casings! In place, and the floor with acoustical sealant critical as always and should be flashed housewrap. Appropriate air space with strips of fiberglass insulation by high density foam beyond the. Insulation are examples of vapor barriers that help control the amount of moisture that passes through insulation! Existing kraft paper vapor barrier on the interior side of the product compressing from!

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