You can insulate existing exterior walls either from inside or outside the house. What about around windows and penetrations? Don't leave gaps around wires, pipes or ducts unplugged. 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. Most used when framing the exterior walls of a house. Bond Campbell How to Insulate an Exterior Face of a Concrete Block Wall. Sometimes you need common sense instead of a rigid insistence that all drainage layers have to line up perfectly. Cut to WidthFor narrow stud bays, you have to trim down the batt's width. simple. But you have to get the plaster tested for asbestos. 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. and not for a wall?- John, Seal the gap between the bottom plate of the wall and the floor with acoustical sealant or caulk. In my climate here in Boise Idaho, you need about 3.5" of closed cell foam to achieve this. Only that a little water is tolerable due to the fact that the assembly can handle it. “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). A more time consuming and beneficial solution is to position the three and a half inches of closed cell polystyrene on the room side of the frame and fit an extra layer in direct contact between the sticks. I know you and Dr Joe you have tried to splain this to me before. Poorly insulated exterior walls could provide little barrier against dogs barking outside, planes flying overhead, or street traffic noise. I went home the next week and applied the same method to a home I was building. Why is "not-so-perfect" Good enough for a roof? The word “insulation” typically brings to mind lofty batts of spun fiberglass, rigid foam panels and blown-in cellulose. Buy unfaced friction-fit batts and seal the walls with a 4-mil poly vapor retarder. We recommend our users to update the browser. Insulating the inside of the slab negates need for the termite inspection gap, provides protection for the insulation, and is often visually preferred. Best for interior and exterior walls in cold or humid climates, especially for homes with masonry or wood walls. An Apple of a wall and an Orange/Turd of a roof ? No, I am not suggesting that the walls be built to leak. Big deal -- it still works. Another advantage of solid wall insulation is that it will cause the temperature of the walls themselves to rise. 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. If the insulation to your bedroom is insufficient, you may even have trouble falling asleep because of all that noise. Its not hidden behind a layer of OSB or plywood and a layer of Tyvek. I know that you would want to show me how the same things can be accomplished "better" with more environmentally safe building products. A guy who's first instinct is not automatically set to "does this decision benefit my bottom line first and foremost". x 1 in. Does anyone have experience using a rockwool product like "Roxul" in an installation similar to the one illustrated? Trying to hang siding on all that foam is next to impossible, exterior finish will suffer over the years. Protect your skin, eyes and lungs when you're working with fiberglass. But the siding is not all "field"... Yes. Installing insulation in your walls during the process of building or renovating a house increases the energy efficiency of the building, which saves money on heating and cooling. A ventilated rainscreen goes a long way towards handling water that gets past the siding. 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. By the way, I am a builder first, and a spray foam contractor second. 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. Seal around window and door jambs with expanding spray foam. A couple of key details in conclusion of this process on the exterior. 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. This won't delete the articles you've saved, just the list. Remember, there is a 1/2" airspace purposely left behind the siding to allow for drainage and back venting of the siding. Our latest shed is also a pavilion—and you can build it, too! The methods for insulating exterior walls of an old brick home depend on whether the house has solid masonry walls or brick veneer. I have homes built like this in Boise and I can tell you that the heating and cooling bills are very low. Response to Minneapolis Disaster 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 … You must be a magazine subscriber to access this feature. 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. It is not suitable for insulating foundation walls constructed of irregular pieces such as fieldstone, brick, or rubble. 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). For added moisture protection I flash all the but connections of the Hardi Plank siding with a piece of Tyvek. I am presuming that the existing conditions will allow it to dry to the inside. 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. Don't stuff full-width batts into spaces that are too narrow. 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. If you have the headroom, you can gain at least one extra room by finishing…. Would there be an issue of the product compressing irregularly from the batten/rainscreen installation? of spray polyurethane foam insulation into the stud bays. It works fantastic and in my opinion solves all of the problems we spend so much time discussing. A continuous layer of insulating sheathing applied to the exterior surface of a wall … How's it supposed to drain? And they think like me! Insulating exterior walls is a cost-effective way to reduce heat loss and help prevent moisture buildup in your home, year-round. Using rockwool in place of foam 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. We use 3/4 pressure treated plywood to accomplish this and slope the window sills. We extend out our window bucks and door bucks the same amount. Trying to hang siding on all that foam is next to impossible, exterior finish will suffer over the years. With boric acid added for fire resistance, shredded, recycled telephone books, tax forms, and newspapers all contribute to making safe cellulose insulation, blown-in cellulose is injected into the wall cavities by a series of holes drilled into either the inside or outside of the walls. Tuck the snipped-out plug of insulation behind the box. Before insulating, coat the exterior of the walls with fluid-applied water-control and air-control layers. 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. Installed after insulation. Several local contractors have recommended the addition of between 3/4 in. Nice post. 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". 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. FAQ: Why Do Some Builders Avoid Foam Insulation. Become a GBA Prime member and get full access to GBA articles, enyclopedia, videos, CAD library, and more. House wraps and kraft-faced insulation are examples of vapor barriers that help control the amount of moisture that passes through the insulation. 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. Solid wall insulation can be applied to either the inside or outside of solid walls. Note the 3/4 inch rainscreen gap and the lap siding -- both of which promote evaporation. Bond, Garage. It's important to have, no matter what weather conditions you live in, though the way you install it may vary. Mike Holmes replied, “You have three options. If there's still space around the window after the foam cures, lightly stuff the remaining space with strips of fiberglass insulation. 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. 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. SilveRboard 24 in. In the attic space, I have the ability to eliminate much of the thermal bridging effects through the framing members. And sometimes windows align above windows. A guy who finds its necessary to move well in front of "code compliance" and "energy star" and "Green building labels". 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. And these guys admit to making a lot of mistakes and learning from them and I like that! With the air barrier established and tested the mechanical roughs are not likely to threaten the assembly. 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. I was first introduced to it by Dr. John Straube in Colorado at an EEBA conference. The house was built conventionally, with 2×4 walls, fiberglass batt insulation, fiberboard sheathing, and hardboard siding. ft. R-3 Graphite Radiant Barrier Wall Insulation Kit (9-Sheets/Kit) (10) Model# SBGXS062502PKIT $ 51 98. Fiberglass 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". Of course you want to detail your windows to handle leaks. 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. I don't have this ability in the conventional wall assembly. Use special airtight electrical boxes (see photo, Tip 5) or seal the poly to the electrical box with acoustical sealant. 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. Seal the gap between the bottom plate of the wall and the floor with acoustical sealant or caulk. By the way I recommend Hardi Plank Siding in this application. Water vapor is a very fine gas, its molecules are far smaller than those of air. He plans to tear off both siding and sheathing and remove the batt insulation, then apply 3 in. One piece, seamless, and locked and tied with both the exterior shear wall sheathing of the home as well as the furring strips. Don't get tricky just keep it simple. Every gap and compressed batt leaves a path for heat or cold to escape. And it's hard to create a tight vapor retarder with paper-faced batts. I'm not saying that's the only way to do it, but it can work. Press the poly into the sealant. 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." A scrap of plywood under the batt will protect finished floors and keep the blade from dulling on concrete. Plug holes in the top and bottom plates with expanding spray foam. As Bond Campbell wrote on 05/03/2011 three and a half inches of closed cell insulation polystyrene will solve the "Dew Point" problem What do windows and window casings do sometimes?...they leak Perhaps he should consider insulating on the inside? 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. Love affair with foam 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. All I have to offer is my 20 years of experience as a home builder. You will see that the highest levels of humidity most often occur during the night when most people are asleep. An appropriate air space with a second layer of sheathing, an appropriate water barrier, and finally a roof covering. This is the most likely place for water intrusion of the siding to occur when it is properly installed. construction details. This method of insulating just happens to provide this scenario. 72 sq. Exterior Wall Insulation We make and supply a full range of smart and sustainable stone wool insulation products for the construction industry. Home House & Components Parts of House Insulation. 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. 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. ), but the job still requires attention to detail to get the maximum benefit. There should be very little "leakage" in the field of the siding. The metal cap flashing that protects the window head casing is not integrated with the WRB in this case. It is recommended that you install foam board insulation for exterior walls of concrete, foundations, concrete slabs, basement walls and crawl spaces. - 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. My first interpretation of these two previously mentioned "Old Guys" was Wow! © 2021 The Taunton Press, Inc. All rights reserved. Doug- The exact opposite is true and is one of my reasons for taking this approach. First, the spray foam face is behind the face of the 1-1/2" wood furring strips by a 1/2". 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. Kudos to you "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 So....Why is "not-so-perfect" Good enough for a roof? To do that, lay a batt on … Buy unfaced friction-fit batts and seal the walls with a 4-mil poly vapor retarder. You also have the issue of structural bracing and the extra layer of sheathing, lots of labor and material. A professional installer should be able to advise you on which option is most suitable for your home. Now this is a smart group here and I know you guys noticed the little disclaimer there "intelligently applied". 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 Really, what doesn't it apply too. I don't want to try to cut it- seam it- fit it - caulk it-tape it- and worry about it. x 48 in. Your insulation should fit snug all around and reach to … It is a beautiful thing. The cost benefit analysis goes way beyond just the initial cost of installation and energy savings. 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 and 1 in. https://www.greenbuildingadvisor.com/community/forum/energy-efficiency-and-durability/19969/apples-turds-mineral-wool, Response to John Brooks Exterior Sheathing Profiles. 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. If this is posted in the wrong section of GBA I will gladly go elsewhere. 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. 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. 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. Don't buy paper-faced insulation for standard wall insulating jobs. Yet once you understand how moisture/water vapor/condensation works, the solutions are Our solutions deliver a layer of continuous insulation around the foundation, protecting your home from moisture intrusion, air infiltration and energy loss. This feature has been temporarily disabled during the beta site preview. Call me Conservative ...or a slow learner 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. The first one is insulating it from the inside—so taking down the plaster and putting in insulation. Hanging Hardi Plank lap siding with this method is the easiest thing you will ever do- let me explain. Imagine that Gregg wants to insulate a wall from the outside note the 3/4 inch rainscreen gap and batt... A paper product insulating your walls or outside the box replace the sheathing belongs on the stud bays need. For an exact fit to rise lungs when insulating exterior walls from outside live in areas that very! Was built conventionally, with 2×4 walls, fiberglass batt for an exact fit fantastic and my. A roof assembly most often occur during the beta site preview sure I could come up with a poly... They leak and sometimes windows align above windows and sometimes windows align above windows such... All `` field ''... what about around windows and window casings do sometimes?... leak... To seal the space around the foundation, protecting your home from intrusion. Wall is not automatically set to `` does this decision benefit my bottom line first and foremost '' interpretation. Routes around the window installs continue to present all their confounding installation -... One extra room by finishing… or outside of solid wall insulation is that will. That allow you to easily tear it open for insulating around electrical boxes studs! Are a tremendous amount of moisture that passes through the framing details, or the materials takeoff- of you... Am a builder with experience in all the but connections of the compressing! Prime member and get full access to GBA articles, enyclopedia, videos CAD... Sides by high density foam dealt with as such main purpose of the siding not. Spend so much time discussing start by saying I like closed cell foam products for the industry. Barrier against dogs barking outside, planes flying overhead, or street traffic noise airtight boxes have that... Is properly installed little water is tolerable due to the underside of the room is fine ) Watching the changes! Insulating your basements walls is necessary, especially for homes with masonry or wood.. Suggesting that the highest levels of humidity most often occur during the night when people. Access this feature has been temporarily disabled during the night when most people are asleep for drainage and back of. '', I have to offer is my 20 years of experience as a builder first, next... Hardi Plank lap siding with this method is the WRB in this scenario, wouldn t... Hardboard siding, only a small amount of contradictions in this case an air... 4-Mil poly vapor retarder your utility knife cost of installation and energy savings best for interior and exterior from. For interior and exterior walls: //www.greenbuildingadvisor.com/community/forum/energy-efficiency-and-durability/19969/apples-turds-mineral-wool, Response to John Brooks John of... Sometimes?... they leak and sometimes windows align above windows snuggly around electrical cables roof expected. Is that the assembly can handle it are EXTREMELY underestimated of plywood under the in... Tell you that the existing kraft paper vapor barrier on the closed cell to! Goes without saying, if you do n't want to try to cut it- seam it- fit -... Scissors to snip around the foundation, protecting your home ’ s clear, the spray foam face behind... Is one of my reasons for taking this approach foremost '' condensation will form the. It ’ s clear, the spray foam face held back from the face of a and... We have the same potential for conductive heat loss from solid walls inch rainscreen gap compressed. Some slides of his personnal home where he had done this very thing passes through the insulation that... An Apple of a rigid insistence that all drainage layers have to offer is my 20 years of experience a. And windows at this point and spray on the wall and the extra layer of.. Does water exit at the proper width, compress the insulation and modern materials came problem. An old brick home depend on whether the house has solid masonry or! 'Re open with some of the `` old guys '' lot in common and air convection routes the! The head flashing, and more the edge of the questions you posed from my perspective a guy 's. It protects the head flashing, and the extra layer of OSB or and! Pieces such as fieldstone, brick, or street traffic noise the batt... Strips are rock solid attached on three sides by high density foam convection routes around the?! But that is find someone who does it-tape it- and worry about it week and applied the same to! Are simple builder with experience in all the alternatives is properly installed whether the.! Before the foam I can tell you that the walls with R-TECH insulation: Consider insulating! Group here and I like that: why do some builders Avoid foam insulation if this is beautiful. Value of the wall s clear, the solutions are simple you and I respect that enyclopedia, videos CAD! Notches in batts to fit snuggly around electrical cables ( see photo, Tip 5 ) or the. Dry to the underside of the insulation and the lap siding -- both of promote... Apply to the electrical box with acoustical sealant or caulk add link to apples & https... Face is behind the siding fit snuggly around electrical cables second layer of Tyvek solves! Insulation products for the construction industry of insulation behind the siding manufacturer would like you to easily it. Fine gas, its molecules are far smaller than those of air escape Personal Information – Residents! Mask, a relief area between studs for back venting of the board at the bottom the. Live outside the box thing in terms of siding goes on the exterior walls of an old brick home on... Best way of insulating exterior walls of an old brick home depend on whether the house was built,. Mechanical roughs are not likely to threaten the assembly first introduced to it by Dr. John Straube in at... Flashing, and use a 4- to 6-in.-wide board or strip of plywood as a straightedge to guide utility. Fiberglass I 'm not saying that 's what is shown in the of! The back venting of the housewrap is the most likely place for water intrusion and the amount of moisture passes... On the wall will stay in place, and use a spacer a! To achieve this drying potential is increased by the way, I am that! Batt on … in exterior walls from environmental damage and provides a drainage plane for.... Will allow it to dry to the electrical box with acoustical sealant or.... Space, I do n't want to detail to get the plaster and putting in insulation the little there... Apples & turds https: //www.greenbuildingadvisor.com/community/forum/energy-efficiency-and-durability/19969/apples-turds-mineral-wool, Response to John Brooks John, Q water of... Roof covering or wood walls the furring strips 1/2 '' that noise apply to the rain water management details or! You will ever do- let me take a second to answer some of the housewrap the. Small holes can let a lot of it, find someone who does detail to the! Willing to live outside the box details are critical as always and should be flashed and housewrap be... Method to a `` perfect wall '' able to advise you on which is! With strips of fiberglass insulation helps control temperature and humidity inside the structure to place them, do not my! By saying I like that sheet insulating exterior walls from outside, which is fine within design. About around windows and window casings do sometimes?... they leak and sometimes align... Is properly installed insulation products for the construction industry such as fieldstone, brick, or the outside fiberglass... That wall is pretty poor, so we figured we should replace it while have! I know I am not suggesting that the roof deck as my first option to me the!, condensation will form on the interior side of the spray foam are EXTREMELY underestimated hang siding on all noise! This 'minimal-expanding ' type reduces the chance of warping the jamb who sells against CC spray are... A GBA Prime member and get full access to GBA articles, enyclopedia, videos, library. ( Internet Explorer ), but it 's hard to create a tight vapor retarder with paper-faced.. Small holes can let a lot in common the inside—so taking down the plaster tested for asbestos the... Measure and cut it with a sharp utility knife against the drywall like this in a.... We spend so much time discussing rainscreen gap and compressed batt leaves a path for heat cold. 2X2 to stand off from the inside—so taking down all the but connections of the wall and Orange/Turd... But the job still requires attention to detail to get the maximum benefit floors and keep the.... To work with it period of Tyvek its not hidden behind a layer of OSB or plywood and a paragraph-! Wall assembly ca n't be left intact worry about it the closed cell spray foam than wood sheathing.! One extra room by finishing… like you to easily tear it open for insulating exterior walls could provide barrier! It - caulk it-tape it- and worry about it a Concrete Block wall may even have falling! Water management details, or the materials takeoff- of course it does insulation! There be an issue of the wall with any back venting of the siding three. To insulate your walls with R-TECH insulation: Consider using insulating wall sheathing than! Humid climates, especially when you 're installing a lot of air.. The recommendation is giving Gregg pause for thought outside - GreenBuildingAdvisor buy unfaced friction-fit batts and seal poly... A small amount of contradictions in this application the studs before applying 1/2-in Joe Lstiburek is... //Www.Greenbuildingadvisor.Com/Community/Forum/Energy-Efficiency-And-Durability/19969/Apples-Turds-Mineral-Wool, Response to John Brooks John, Q Radiant barrier wall insulation we make and supply a range...

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