Stucco over rigid foam. Installing 3 coat stucco and stone veneer 2.
Stucco over rigid foam However, from a building science perspective, there is no reason you can't install rigid foam on the exterior side of the siding, as long as: 1. Sort: For drainage, it may be as simple as using two layers of 30# building paper, shingle-lapped, OVER 2-3" of foam, with stucco over the paper, to provide a drainage plane and path (Flashed at ground level and left open) For a building enclosure, would the following stack work?: - 2x6 walls filled with blown in cellulose - OSB sheathing - Tyvek housewrap - 1" rigid foam - 3 course stucco Follow-on questions: - Should there be anything between the rigid foam and stucco (besides the wire mesh)? I want to be sure to establish this with the stucco contractor, and at this point he feels Bricks, Masonry, Cinder Block, Paving & Walking Stones, Asphalt and Concrete - Stucco over foam insulation - For insulation requirement, we are putting R5 foam insulation on the outside of 2 out of 3 walls of an addition. . HCS (hard-coat stucco) is a Portland-cement plaster. The systems are generally considered by plaster bureaus more appropriate for residential and low rise commercial projects. Installing metal Z-flashing to integrate the wall's water-resistive barrier (WRB) with the rigid foam. Construction Hey Paula. Because of built in bookcases on the inside of the walls it would be hard to add insulation in As part of this project, I will be adding rigid foam insulation to the exterior side of the wall. Proper installation and protection ensure that a piece of installed stucco foam remains in place and sound for its designed life expectancy. Polystrene is similar to polystyrene foam, but is harder and more durable. This eliminates the need for hanging the lath on nails, and embedding the lath in the foam, Alta exterior ltd stucco & parging repair #parging Based in Edmonton, Alberta, we also provide our services in Sherwood Park, St. Zip-system wall sheathing 4. 35 Replies. Cut, glue, and fit the insulation between the furring strips. They were visualizing Install stucco as an exterior wall cladding over rigid foam insulation with proper preparation to provide water management as well as a sound substrate for the stucco. Home Innovation Research Labs March 2020 the application of heavyweight claddings such as stucco and adhered masonry veneer s over rigid foam insulation on light -frame walls and potentially provide the basis for follow-on qualification testing to The article recommends (for stucco over rigid foam) that you install vertical furring strips over the foam, followed by paper-backed metal lath. A polymer-cement base coat. My problems are several; 1) Does anything go over the exposed foam before stucco like tar paper? In this video, the master plasterer walks us through a couple of options for stucco over thick exterior foam. This step-by-step tutorial will show you the basics to installing the foam like a You can simply measure the distance from your starting point to the center of the stud and Install stucco as an exterior wall cladding over rigid foam insulation with proper preparation to provide water management as well as a sound substrate for the stucco. A base & mesh system over the brown coat is recommended to minimize potential cracking issues. 👉 www. Benefits of foam trim over wood trim are that it will never change its shape (twist, warp, split etc. Made right here in the USA, StyroTrim® offers the highest quality, and the most cost-effective Stucco and cement-coated foam treatments for interior and exterior residential and commercial structures. Look for some rigid foam insulation. The stucco is in bad shape after having been terribly abused by the previous owners, so I'm taking the opportunity to have the whole house wrapped in continuous rigid insulation as part of the re-stucco project. Adhere foam to brick AND use mechanical fasteners. Is it possible to insulate against stucco? Most types of rigid foam insulation, as far as I know, can’t be left exposed; however, for fire resistance, Installing rigid insulation as the exterior sheathing can accomplish all of these tasks, but you need to account for shear resistance (provide wall bracing) in other ways, and you must provide special details if you expect the foam sheathing to perform as a water-resistive barrier (WRB). We struggled with the same area on our build last year. Two main types of "stucco" Traditional stucco uses wire lath to bed a three-coat mortar mix. “Rigid foam is a vapor retarder, so it belongs on the interior,” some old-time builders opined. Michael, Why not put all the R-15 of rigid foam on the interior? That would easier than trying to apply thin stone to the I would think that XPS foam over poured concrete would have much better compression and When a few pioneers started installing exterior rigid foam, some people thought the practice was risky. Beneath the heavy stucco and cultured stone veneer cladding is a 2-inch thick layer of continuous rigid extruded polystyrene insulation. I would like to put 2" of rigid foam over the brick then stucco the foam. This material is over wood framing, not brick/masonry. I would like to generate some shear and bond strength through the foam, so this means using a single layer of foam or gluing multiple layers together. ERIC WHETZEL | Dec 17, 2018 01:00pm | #1. Join thousands of people across the country that have modernized and enhanced the look of their homes using StyroTrim® brand stucco coated foam trims and treatments. These are often called a hybrid system. How should this be done? What type of stucco is best? I do not want to put the insulation on the inside of the house because it is a small house and it would take up too much room. 👉 Install stucco as an exterior wall cladding over rigid foam insulation with proper preparation to provide water management as well as a sound substrate for the stucco. provide a drainage gap in front of the water control layer. Exterior architectural styrofoam trim and accent molding. com | SUBSCRIBE, please!https://www. For many years stucco has been applied over various forms of foams, most commonly EPS and XPS. How to do styrofoam stucco systems Versus traditional stucco systems are similar and interchangeable when doi I am installing 2" rigid foam against the 8' exterior poured cement basement walls. It can be used for furring over block, concrete, wood sheathing, or what have you. 6 to 8. Plans call for vertical wood siding over a layer of rigid foam insulation. Invented in the labs of Dow Chemical Company, it started to attune with the construction sector since the mid-40s, evolving with Julie, The installation instructions of the Vinyl Siding Institute and most (if not all) vinyl siding manufacturers allow vinyl siding to be installed over rigid foam sheathing. Applying stucco foam requires no specialized concrete fasteners. The house has zero insulation. SilveRboard Acoustic Rigid Foam Insulation kit - 12 sheets - coverage 96 sq. 1219-81 - gray, 1219-82 - white) is a polymer-modified, Portland cement based rigid coating for use over rigid insulation panels, foam shapes, and insulated concrete form systems. I see videos of pros using aluminum flashing but Currently building a house that will have stucco exterior with 1 inch of unfaced rigid foam under the lathe. Paul Fisette is a really sharp fellow. 2" X 4" stucco foam window and door trim. I'm pretty sure (from another home installation project) that these posts are not really doorposts but are stucco over rigid foam insulation. More effective insulation With R-values ranging from 3. 5 per inch, EnergyShield is still the industry leader. Albert, Fort Saskatchewan, InsulFoam Tongue & Groove (T&G) Fire rated EPS substrate for stucco homes. This can be a concern when applying EIFS stucco over foam board. In fact, when using mineral wool as continuous exterior insulation, you have less concern as your walls will be able to dry in both directions should the sheathing get wet (assuming vapor-open cavity insulation as well and no class I or class II interior vapor retarder in your climate). Made from expanded polystyrene (EPS) and used as a substrate for stucco in conventional and manufactured housing, Insulfoam Tongue & Groove (T&G) sheathing provides lasting continuous insulation (ci), superior long-term performance, prevents moisture buildup, and is backed by Fastening Rainscreen to Wall Assembly With Rockwool Insulation and Stone/Stucco. Repeat this step throughout the entire exterior you plan to cover with board and batten. I hope to use one coat stucco on this. 6. I believe that your proposed ratio of exterior to cavity R-value is fine. This is troweled over the foam insulation panels. QUIKRETE Foam Coating can be used above or below grade in exterior or interior applications. I'm adding another detail from the same manufacturer, again showing the bottom of the rigid foam "protected" by metal trim. If your mason is suggesting the use of vertical strapping behind bricks, I would choose another mason. 5. A. I am going to add 3" How do you install stucco over Styrofoam? 1:558:34Learn to hang or attach stucco styrofoam molds around windows YouTube 👉 www. For example, you wouldn't want to try to install a liquid-applied WRB over rigid foam (unless, of course, the manufacturer of the liquid-applied WRB specifically recommended that application). 5″ away from the studs. This is the type of work that is usually performed by an EIFS contractor, not a homeowner. In Episode 15, we will show how a WEEP SCREED is first installed at the bottom to allow for proper drainage in the future should the stucco become damp or we He then put 2 inches of Celotex insulation and then had a three coat stucco applied over the entire house. Zone 5, sometimes 6. long Z sections. I have a client who is looking at remodel and wants to improve the insulation and sealing. It is typically applied over a rigid foam board and lath to provide an Energy Code required Continuous Insulated durable cladding. One-inch vertical leg gets nailed to the bottom 2-by plate, through the 1 in. Confirm that the rigid foam is firmly stuck to the stucco. You have come up with a way to air-seal the perimeter of the rigid foam to limit air flow through the gaps between the siding and the foam. I had initially wanted a minimum of 2" to 2. You are fairly sure that the sheathing is dry and sound. Then fasten paper-backed metal lath to the strapping. Do I fur out the netting on Since you are essentially doing a plaster/stucco wall, it should be detailed like one, Has anyone ever installed thin stone veneer (natural) over 2" XPS rigid foam ?2x6 wall construction1/2" plywoodtyvek or typar house wrapDriwall rain screen 10mm2" XPS foamMetal lathScratch coatThin stone veneerIf so, Exterior Paneling and All Exterior Sidings - Rigid Foam insulation R-6 with Stucco - For stucco walls, Believe it or not, there are really manufacturers that do not require EIFS to go over foam. The main detail is using long enough screws to anchor the lath into solid wood. I would like to stucco this exposure for lack of any better ideas. techinstructor Discussion starter. Synopsis: A builder explains his method of insulating concrete foundations by applying a layer of rigid foam There seems to be some debate over how to anchor 3-coat stucco over rigid foam while maintaining <1/64 deflection to avoid cracking. “Exterior rigid foam is risky, unless you live in Florida. 21 posts · Joined 2009 Add to quote; Only show this user #1 · Jan 17, 2009 (Edited Barrett Enterprises GigaCrete GigaHouse: Affordable Green GigaHouse (400 sq ft & up) is a steel-framed rigid insulation panel system. Two Coats. I am thinking about using 1" rigid foil-faced polyiso foam board over my plywood sheathing and then stucco over part of the house and hardiboard siding over the rest. Will be taking the interior down to studs. One-coat stucco installations can be traced back to the 1970s energy crisis and are often applied over rigid insulation boards and lath for energy efficiency to help meet thermal code requirements. 5" Metal Roofing; Two-Coat Stucco Siding Over Rigid Foam Corners and connections are where insulation and air barriers can have trouble. I have seen it applied directly to wood based sheathing materials. I have studied up on stucco and drainage planes etc. Can I put this on a painted concrete exterior wall and then stucco over it? By Harry,Jan 2, 2025. It is also used extensively in the panel is of sufficient density, it may be considered a rigid sheathing base allowing the water-resistant barrier to be placed over the Polyisocyanurate product (see notes on page 2). May 10, 2021 05:48pm | #1. Rigid foam over log walls? I'm in the process of renovating a kit log cabin home, This method consists of adding a layer of exterior foam, followed by a layer of synthetic stucco. Determine the location Stucco wall systems installed over insulating foam board: This article discusses the installation of stucco exterior wall finishes over insulating foam board, including the choice of high-R value insulating board for use under stucco on Spray foam insulation is the best option for filling gaps between the walls and the exterior on existing stucco surfaces. We live in Ithaca, NY. Follow manufacturers recommendations. Z furring is an excellent method of stucco over foam board. A glass fiber reinforcing mesh. Location is Western Canada, Souther Learn how to install stucco over rigid foam insulation in new and existing homes with this comprehensive guide. Well, the entire house cracked. EnergyShield® CGF brings durability together with moisture resistance in vapor-open designs for Type V construction. It’s a There are two common contemporary methods used to create a rainscreen wall; one method involves applying a water resistive barrier (WRB) over the sheathing, followed by the rigid EPS foam, dimpled/drainage membrane, wire lath, typically 17 gauge, fastened through the insulation, and into the sheathing and layers of traditional stucco. The pressure and weight of the stucco, if not properly accounted for, can lead to the separation of the foam board from the wall surface. Onecoat stucco has had good success when applied per Styrofoam – concrete foundation, for me, is a system of two walls of rigid insulation with a wall of concrete inside ie: Polycrete I have received expert advice that the Styrofoam is to be sanded #36 grit, covered with a layer of There are two common contemporary methods used to create a rainscreen wall; one method involves applying a water resistive barrier (WRB) over the sheathing, followed by the rigid EPS foam, dimpled/drainage membrane, wire lath, Synthetic Stucco over XPS foam. Tyvek Drainwrap 5. Stucco over exterior rigid foam - yea or nay? Metal roof with exterior fasteners OK for school? Replies. This foam will be buried by backfill except for the top 1'-2'. Stucco (Portland cement plaster) can be applied over foam substrates. What we are doing is attaching both foam and stucco lath (self furring, no paper backer) with the plastic anchors. Installing 3 coat stucco and stone veneer 2. I would like add insulation to the walls of an addition to our mostly brick house in Climate Zone 4a. If you want to have an air gap between your stucco and the rigid foam, use vertical 1x4 strapping screwed through the rigid foam into the studs. One-coat stucco is Building Code compliant, I am in Zone 5, building my own home, new construction, 2x6" stick framing, 1/2" APA plywood, final exterior: 3 coat stucco and stone veneer. My concern was that I have seen people put just foam and place the stucco on top of the foam and that will not last. Compressed or insufficient insulation can cause cold spots, which lead to condensation, mold, and rot. Panels of expanded polystyrene foam insulation board (similar to foam coffee cups). The current one is what is the most DIY friendly method to protect that bottom edge of foam that is under the siding, but next to the ground near the sill plate? I want to prevent bugs of course, but also keep moisture out too. Option B: 1 + 2. If that sounds more or less straightforward, the details are not. I have a house in El Paso Texas that has a brick exterior. 14). The contractor has limited experience working To the right and left of my front door are 6" deep protrusions/doorposts covered in stucco. ft - is a high performance flat-sheet insulation material made from Expanded Polystyrene (EPS) The weight of the stucco can exert enough force to cause the foam board to detach from the walls. Q. Same as above 3. Here are my questions: a. They are concerned about the weight 3 coat stucco hanging 1. What is the best exterior sheathing? Every WRB is different. 1 With Foam Plastic: The stucco system with EPS foam plastic must be installed as noted in Sections 4. Also I don't think that you can only fasten the lath to the rigid foam board. Read about creating a bond break between the stucco and the underlying foam and sheathing to prevent bubbles and voids from forming in This guide provides a comprehensive guide on installing stucco over rigid foam insulation for a durable and energy-efficient exterior. com/channel/UC-w8-a4UPNynP8v8A4Jlz1w?sub_confirmation=1How to install two layers of EnergyShield® For over 30 years, EnergyShield has set the standard for residential continuous insulation. QUIKRETE® Foam Coating (No. 1 inch unfaced XPS foam 7. Installing the foam for a one coat stucco system is quite simple. Cement plaster (stucco) over rigid foam to The rigid foam added the required R value. ft - is a high performance flat-sheet insulation material made from Expanded Polystyrene (EPS) A great example of properly attached adhered masonry over continuous insulation was recently completed on The New American Home project in Las Vegas for the International Builders Show. These are installed with adhesive or mechanically fastened to the substrate, which is usually plywood, oriented strandboard or exterior-type gypsum board. I want to mount a video doorbell (weight less than a pound) to this area next to my front door. This is a rental property and wishes to minimize cost. A stucco-like coating makes the foam match stucco. EIFS was developed in Europe following WWII and applied to masonry walls of older Animation - Install DuPont™ Tyvek® HomeWrap® OVER Rigid Foam Board - detailed as an Air and Water-Resistive BarrierFor more on DuPont™ Tyvek® HomeWrap®, go One-coat stucco has been applied over rigid foam backing for decades, but this is not exactly the same as EIFS (Exterior Insulation and Finish System), a product that is popular and will be discussed in another article. ) *All manufacturers permit the installation of hard-coat stucco over rigid foam insulation. Determine the location of the wall's water control layer (typically behind the insulation over the exterior sheathing). Choosing a protective covering for the rigid foam. You don't need any strapping behind brick. 1 through 4. ), it will never rot, minimal to none maintenance, 6. Usin Concerns: Contractor, and the stucco rep he talked to, say the most they can do is western 1 coat over 1″ of foam. It covers the scope, success, climate, Stucco weighs around ten pounds per square foot. Unfortunately, the house was built 30 yrs ago as a rectangle, North to South. The boards would be applied over the existing deteriorating stucco, fastened through it and the I am going to be installing 2" of rigid foam over my OSB sheathing soon and I have two concerns. How would it impact WRB and drainage strategies? Or any other element in the wall assembly design? Can I put this on a painted concrete exterior wall and then stucco over it? By Harry,Jan 2, 2025. It is crucial to follow the correct installation techniques and ensure I am planning on exposing my earth-bermed house on the west side. On mine, Extruded Polystyrene (XPS) foam is a rigid thermal insulation material manufactured from polystyrene. I mean there were huge cracks at every stud In fact I have seen stucco pulled off an existing stucco wall and the foam will come off with it as though the stucco had chemically bonded to the blueboard. Sheet metal shop bent 10-ft. Stucco lath nailed through foam into studs 8. Determine the location of the wall’s water control layer (typically behind the insulation over the exterior sheathing). This system can be applied over moisture-sensitive and non-moisture-sensitive substrates. Can you imagine how heavy it will be once attached to a foam board? Even if you use nails and adhesives to attach these two, there is a good chance that the weight of the stucco will overpower the foam board, and both materials can easily fall from the wall. Years ago, in the planning and how to do it stage, I had conversations with Paul about foam over Masonry. The illustration below comes from the Vinyl Siding Institute. Jump to Latest 17K views 6 replies 2 participants last post by techinstructor Jul 12, 2009. While the stucco may adhere to the foam, the NWCB recommends using a metal reinforcement (lath) over it. Middle, "horizontal" leg that is not horizontal covers the thickness of foundation foam, and the last leg It was a bold statement, but I said it; EIFS is the true continuous insulation, the system verifying the definition. I am looking to install exterior rigid XPS insulation panels exterior to the plywood. 25 and fiberglass batts have an R-value of 3. foam over studs with steel let-in bracing. I think that metal rigid foam over brick, then stucco. T. I finished insulating the foundation for the wood kiln I'm building. Asphalt felt is very awkward to apply over rigid foam, for a variety of reasons, and few people use it in that location. Stuc-Co-Flex International, Inc. Two-coat assemblies are applied on masonry or Most of the foam boards used with stucco in the one coat system are made out of polystyrene, which is moisture repellent and relatively rigid in terms of its structure. A continuous insulation stucco assembly can be achieved with and runs a close second to the 3 Benefits of Rigid Foam Sheathing. We chose polyiso because it has the highest R-value per inch (6. Replies. Foam contains no formaldehyde, no HCFC’s, no thermal drift, and is non-corrosive. With an R-value of 6. If you are going to use 3" or 4" of foam board insulation over brick with a stucco exterior, I think I would do it this way: 1. Share on Facebook; Styrofoam Stucco System or EIFS. – entangled filament drainage mats. e. 4. Sealing the perimeter of the rigid foam to limit air currents. 1. 1. My question is this: can I reasonably screw-and-glue the rigid panels right over the existing stucco cladding, or should I really remove all the prior layers of stucco first and attach the foam directly to the wall sheathing? As the framing went up, plywood sheathing was installed, and polyiso foam was installed right behind it. 2. 3)If you first apply/fasten rigid foam to the existing wall, then fasten the lath to the foam, the lath will still be supporting the stucco. 3-coat stucco installed directly over foam. The short side is facing South. Posted on: February 08, 2013. RIGID FOAM CEMENT PLASTER One-coat stucco is a proprietary blend of cements and fibers. 0, rigid foam sheathing has much better insulation per inch than other materials (i. But let me say this, it is not the only continuous insulation. Are there any issues I should be aware of? My contractor is concerned about the weight of the stucco not being supported by the Stucco Manufacturers Association is a nonprofit trade association whose purpose is to educate the building industry and the public about the quality use of stucco and best practices of stucco application. The exterior is stucco (45 Years old) and I want to know if there is any way to insulate on top of the stucco and then provide a new exterior. The house started out with 6-12 in. www. 5" of foam insulation. protradecraft. Is this EIFS or traditional hard-coat stucco over foam? 2. The house was built in the late Repair Styrofoam Stucco with Traditional Stucco. Make sure that it’s the same thickness as the furring strips. The VSI installation manual notes, "When the fastener must penetrate through a non-nailable material such as foam sheathing, the The aim of this research by Home Innovation Research Labs was to identify alternate and/or expanded design and installation guidance for the application of heavyweight claddings such as stucco and adhered masonry veneers over The wire mesh will solve the issue and work fine. Stucco Trim Vinyl Wood View All Exteriors Manufacturers. Sounds like you have a good plan. 3. He used to moderate the building science forum at Journal of Light Construction. youtube. Here are my questions: 1. foam. , but I don't see anything about foam underneath. We only have windows on our short south side, so we are exposing the CMU blocks on the west to introduce some windows. Measure 3 feet and 6 feet above the ground. band of foundation above grade, aluminum siding over 1 in. EIFS is an Exterior Insulating Finish System uses a liquid The lath must then be applied tightly over the foam plastic insulation board, with 11/ 2-inch (38 mm) end and 4. (more information on this follows. Super tough, GREEN GigaCrete* coatings (non-Portland) apply directly to EPS foam panels (Generic stucco comp strength 700-1800 psi) Bond strength Direct application over EPS foam for water-resistant exteriors View Video Claire Remsberg, an architect in the Rocky Mountain region, is working on a house where the main goals are to limit thermal bridging through the 2x6 wood frame and to beef up wall R-values. This approach must adhere to stucco manufacturer (system holder) instructions as they are not generically described in the building code. Stucco lath nailed through foam into studs 7. Stucco-Shield® Designed for direct-applied FWIW, whatever data source my insurance company generates preliminary quotes from believes that this home has traditional hard-coat stucco. solar365. Tips? Last Post 23 Dec 2012 12:43 PM by ICFHybrid. The air gap between the vertical furring strips should be ventilated, with air inlets at the bottom of the wall and a slot at the top to provide ventilation at the top -- just like any other rainscreen gap. As best as I can tell, the walls in the later addition to the house have stucco on the exterior, I have no idea about insulation between studs and water barriers in others layers. Traditional stucco over polystyrene boards. Finishes & Surfaces Siding Over Rigid Foam Exteriors. You can place stucco over just the wire mesh with paper behind it so the foam will work just fine as a backer. One-coat stucco is a proprietary system incorporating a blended cement typically applied over a rigid EPS foam sheathing board. 5), allowing us to add almost 10-R to the wall Rigid foam covers the support structure to add shape to the wire mesh. If the latter, would it be susceptible to the same moisture issues as EIFS? The house has stucco, over rainscreen, over 2″ foil-faced polyiso, over Prosoco spray wrap (plus miles of joint & seam and liquid flash), over OSB, over 2×6 framing, with 2×4 inset windows. I'm adding 2" of rigid foam insulation to the outside of a concrete slab that has been I have a stucco house in high desert New Mexico (zone 5B). 1 inch unfaced XPS foam 6. com. What can I use to cover foam board? Rigid foam is susceptible to sunlight. Using a masonry hole Covering concrete walls with rigid foam insulation and troweling on stucco requires experience with the materials. plywood has an R-value of 1. I can't believe that the stucco is going to bond any better to the rigid foam board that is would the existing painted stucco. tinlnawbwizqqlbqebttqdmszocitwayhhyhrqpygctspcjaskemghqermuyaldgeoyozjq