However, if you want to be sure that the area is insulated correctly, having a vapor barrier will do the work. Use metal or plastic reinforcing to strengthen the cement parging on foundation foam boards. The knife is best for cutting long strips, and the rotary tool is best for short pieces of insulation. We and our partners use cookies to Store and/or access information on a device. Fact sheet describing the use of rigid foam insulation to meet energy efficiency requirements and minimize fire risks. The exterior foam layer should be foil-faced polyisocyanurate or XPS and the layer should be at least 1 inch thick. Due to limited space for insulation and venting on the sloping ceiling, consider adding rigid board directly to the ceiling, and then air seal and cover with drywall. 3.1.1 Meets or exceeds 2009 IECC levels4, 5, 6OR; Line up the first furring strip on the bottom chalk line. Continue with Recommended Cookies. We and our partners use data for Personalised ads and content, ad and content measurement, audience insights and product development. If there is a wetting event (e.g., a plumbing leak) that causes the existing wall structure to become wet, it is important that the wall is able to dry to the inside. When installing the foam, use caulk or tape for maximum insulation between the material and the board or floor. Rigid foam has a closed-cell structure that does not allow air to pass through it. It is lightweight, easy to install, and highly effective compared to other forms of insulation. Rockwool Insulation Do You Count Basement Square Footage For Air Conditioner Installation? If you spray the foam evenly throughout the walls, it makes an airtight barrier between the inside and outside. Table N1102.1.1 Insulation and fenestration requirements by component Rigid foam insulation can be stacked on top of each other, like most insulation, to increase the R-value. . Video describing how to properly insulate crawlspaces. Take steps like reducing the humidity in your room if you want to prevent this from happening. You can cut the insulation sheets with scissors to make a smaller section. If the surface of the rigid foam will serve as the water control layer, then the exterior layer of rigid foam cannot be EPS, it must be foil-faced polyisocyanurate or XPS and all seams of the exterior foam layer must be taped. Footnote 4)Two alternatives are provided: a) Grade II cavity insulation is permitted to be used for assemblies that contain a layer of continuous, air impermeable insulation R-3 in Climate Zones 1 to 4, R-5 in Climate Zones 5 to 8; b) Grade II batts are permitted to be used in floors if they fill the full depth of the floor cavity, even when compression occurs due to excess insulation, as long as the R-value of the batts has been appropriately assessed based on manufacturer guidance and the only defect preventing the insulation from achieving Grade I is the compression caused by the excess insulation. Some codes say that if your crawlspace is connected to a basement, you need to cover the foam with an ignition barrier like 1/4-inch plywood or particleboard. Make sure not to miss any spots. 2. Install a screw every 12 to 16 inches. Section R403.3.4 Termite damage 2012and2009International Residential Code (IRC), Section R302.1 Exterior walls Prepare the wall sheathing for air/water control membrane. Using high-efficiency and ultra-efficient insulation along with professional installation (e.g., no gaps, voids, compression, or misalignment with air barriers, complete air barriers,and minimal thermal bridging) creates conditioned spaces that require very little heating and cooling, along with even comfort and quiet throughout the house. How To Prevent Woodpeckers From Damaging House. This price range will change based on many factors, such as the total area that will be worked on, the type of foam used, and where it will be placed. Is there a recommended amount to extend the protection below grade to protect from insects? The most common approach is to apply a stucco-like "parged" finish with a surface-bonding cement. My question is how to cover the portion that is above grade level, but below the siding? gap between the panels and the siding for termite inspection. Paint the drywall surface with the color that you prefer. Make sure not to miss any spots. High-efficiency wall insulation helps provide added thermal protection. Although its not necessarily better than fiberglass, it does have some advantages that can make it worth considering as a replacement to other insulation types. Do the same with the rest of the pieces until the whole surface is covered. Any damage that may hinder its function in your home can be a reason to shorten the century-long life of your rigid foam. Section N1101.12.4 (N1101.6 in 2009 IECC) Insulation product rating The insulation levels should be based on the minimum requirements for vapor control in the current adopted building code and the minimum requirements for thermal control in the current energy code. Open main menu. Ceiling fan problems Please contact our webmaster if you find broken links. We've curated below the most common questions asked about our top rigid insulation choices: THERMAX Polyiso Insulation and STYROFOAM XPS Insulation.With increased attention on resiliency and building code requirements of late, the most asked topics are about mildew, flame spread requirements, and how to material storage. 2.1 Flashing at bottom of exterior walls with weep holes included for masonry veneer and weep screed for stucco cladding systems, or equivalent drainage system.9 Secure the top layer of plywood to the lower layer with nails or screws. If there is no vapor barrier below the slab, or you're not sure, it's best to add a vapor barrier . Concrete and masonry foundation walls shall extend above the finished grade adjacent to the foundation at all points a minimum of 4 inches (102 mm) where masonry veneer is used and a minimum of 6 inches (152 mm) elsewhere.". How can I insulate my existing foundation? EPS should not be used as the outer layer but EPS Type II could be used as the inner layer. Some of the links on this website are affiliate links. Unroll the rigid foam shielding. If rigid foam is rated for water resistance, no other water-resistant barrier is required, if seams in foam layer are sealed. Part 2 of 2. Flexible air barriers shall not be made of kraft paper, paper-based products, or other materials that are easily torn. Once the panels are installed, apply a stucco-like finish. Case study describing optimal design and limitations of cladding attachments over exterior sheathings. Refer to the current adopted building and energy codes for information on appropriate levels of insulation for the different climate zones as well as the proper ratios of vapor and air impermeable and permeable insulation. 8. Install flashings and air control transitions. FEMA report describing findings from an investigation of Hurricane Ike in Texas and Louisiana and residential construction recommendations based on those findings. Section N1102.4 (R402.4) Air leakage (Mandatory) Covering up exposed foundation with siding/insulation, Covering exposed glass fiber insulation in basement ceiling. Photos. Right Furring strips were installed to provide a 3/8-inch drainage plane over the rigid foam and under the fiber cement lap siding. for 2x6 framing.25. Rigid Foam Board Interior Insulation for Existing Foundation Walls, Continuous Rigid Insulation Sheathing/Siding (1), Continuous Rigid Insulation Sheathing/Siding (2), Insulate Your Basement, Part 3: Insulate the Walls and Rim Joists, Existing Whole-House Solutions Case Study: Deep Energy Retrofit of 1910 House, Portland, Oregon, Technology Solutions Case Study: Moisture Durability of Vapor Permeable Insulating Sheathing, Technology Solutions Case Study: Cladding Attachment Over Thick Exterior Insulating Sheathing, Mass Save Deep Energy Retrofit Builder Guide, GM-1302, The 2018 International Building Code: A Compilation of Wind Resistant Provisions, Specifying Rigid Foam Insulation for NFPA 285 Fire Requirements, FEMA P-757: Mitigation Assessment Team Report - Hurricane Ike in Texas and Louisiana, Overview of FEMA P-804, 2010 Edition: Wind Retrofit Guide for Residential Buildings, Habitat for Humanity South Sarasota County, 2009 and 2012 IECC Code Level Insulation ENERGY STAR Requirements, ENERGY STAR Certified Homes Implementation Timeline, 2021 International Energy Conservation Code (IECC), 2009International Residential Code (IRC). It is advisable to wear a face mask while doing the sanding to protect from inhaling small particles. The exact amount of polyiso will keep your home or office cooler in summer and warmer in winter than fiberglass insulation. Footnote 8)All insulated vertical surfaces are considered walls (e.g., above and below grade exterior walls, knee walls) and must meet the air barrier requirements for walls. Some XPS products have passed the NFPA 286 testing and don't require a thermal barrier; check with your manufacturer to see which XPS products are exempt. 3.4.3a Corners insulated R-6 to edge22, AND; of rigid foam insulation on the slab and float the subflooring above. Right Ripped OSB provides furring strips for a ventilation gap behind the wood siding. The Building America Field Kit allows you to save items to your profile for review or use on-site. Proceed only after needed repairs are performed. Install wall cladding and trim, by attaching to the furring strips. Hi Mary, yes you can put Rigid foam insulation against concrete walls, we would recommend EPS foam and at least 2 inches for proper protection from moisture. This means that, at zero cost to you, I will earn an affiliate commission if you click through the link and finalize a purchase. Footnote 6) For purposes of this Checklist, an air barrier is defined as any durable solid material that blocks air flow between conditioned space and unconditioned space, including necessary sealing to block excessive air flow at edges and seams and adequate support to resist positive and negative pressures without displacement or damage. If the foam insulation is placed outside, If you're unable to cover it right away, make sure to do so within 60 days of its installment. It has better insulation powers than expanded polystyrene. Section N1101.10.1 (R303.1.1) Building thermal envelope insulation There are two possible locations for the water control layer for this retrofit wall assembly at the outer face of the insulating sheathing or between the insulating sheathing and the existing exterior wall. In this video, Risinger talks to us about the benefits of using Comfort Board 80, stonewool insulation, which is made of rocks. Right This foil-faced foam sheathing has taped seams and proper flashing details so it can serve as a drainage plane. Apply two coats of epoxy paint over the existing slab. These finishes range from a thin paint-on coating to a thick acrylic-modified mortar applied over hardware cloth or metal or fiberglass lath. The polyurethane spray foam is a two-part compound. Can you do it yourself? In most cases, this is because foam board does not have the same insulative value by volume as expanding closed cell foam. Footnote 10) Any of the following systems may be used: a monolithic weather-resistant barrier (i.e., house wrap) shingled at horizontal joints and sealed or taped at all joints; weather resistant sheathings (e.g., faced rigid insulation) fully taped at all buttjoints; lapped shingle-style building paper or felts; or other water-resistive barrier recognized by ICC-ES or other accredited agency. Using house wrap tape, cover the whole surface of the rigid foam insulation. Exhibit 1, Item 1)Certified under the ENERGY STAR Qualified Homes Program or the ENERGY STAR Multifamily New Construction Program. Connect the air control membrane to the air control layer of adjacent assemblies in a tight and durable manner. Begin putting a handful of adhesive on the back side of the drywall. There are many different types of insulation available to us. Table N1102.4.1.1 (R402.4.1.1) Air barrier and insulation installation, Retrofit: 2009, 2012, 2015, 2018, and 2021 IRC, Section R102.7.1 Additions, alterations, or repairs. The thin paint-on coatings are easily chipped and prone to peeling. This PickHVAC Foam Board Insulation Guide covers the types, best uses for each, their R-values, prices and more. I suppose that would be good to put the pieces together again after cutting the 4x8 piece down to size. In addition, this type of insulation can stop air from getting in and out of your home. 12. 1. Based on the findings of the inspection, revise the wall assembly plans and review specific detailing as needed. Two common methods are to install a product like Nudo Groundbreaker or Protecto Bond. diameter unless otherwise indicated by the manufacturer. Choosing Foam Board Insulation By Charles Ouellet Thickness and R-value are only part of the story. MacKinnon said that "a builder Santa Fe who didn't know and use this technique would probably be out of business" because demand is high for adobe-like finishes. For other types of spray foam insulation, the vapor permeance of the installed thickness must be at least 1.0 perm. ENERGY STAR Certified Homes requires that ceiling, wall, floor, and slab insulation levels meet or exceed those specified in the 2009 International Energy Conservation Code (IECC) with some alternatives and exceptions,and achieve Grade 1 installation per RESNET Standards (see2009 and 2012 IECC Code Level Insulation ENERGY STAR RequirementsandInsulation Installation (RESNET Grade 1). The following exceptions apply: air barriers recommended, but not required, in adiabatic walls in multifamily dwellings; and, in Climate Zones 4 through 8, an air barrier at the interior vertical surface of insulation is recommended but not required in basement walls or crawlspace walls. In any other house area, you can put fiberglass batt over rigid board and then cover it with drywall. Although the rigid foam doesnt fit snuggly into space between studs because of its rigidity, it is the best insulating solution for a vapor-heavy basement wall. Attach cladding and trim to the vertical furring strips. After the rigid foam has been applied to the wall, apply pressure for 30 seconds. "Is there a recommended amount to extend the protection below grade to protect from insects?". 1/2 in. Aaron, The first step is to measure the width and length of the slab and multiply them to determine the number of needed rigid foam insulation to cover the concrete . Remember to mark them down per the above measurements (Bay 1,2,3) Step 4: Install Each Rigid Foam Board In Its Corresponding Bay Start placing individual foam boards in their respective bays. Right Coated sheathing is taped at all seams to serve as an exterior air barrier on the walls. However, house wrap or a paint-on membrane could also be applied to the original sheathing before the insulating sheathing is installed. Manage Settings Table N1102.4.1.1 (N1102.4.2 in 2009 IECC) Air barrier and insulation installation/inspection, Section R302.1 Exterior walls c wire Transition the wall air/water control membrane to adjacent assemblies. Explanation: As long as it is closed cell insulation. As such, 2" x 4" walls are generally not deep enough . In other words, putting these barriers over rigid foams improves safety and prevents the spread of fire. One method for increasing the insulation level of the walls in existing homes is to remove the exterior cladding and install rigid foam insulation, possibly new house wrap, and new exterior cladding over the walls. Part A is isocyanate and a mixture of polyols and additives and Part B is the catalysts. Right - XPS foam insulation is attached to the existing exterior wall with wood furring strips that serve as a nail base for the siding and are installed vertically to allow for drainage and drying behind the siding, Right - Foil-faced polyisocyanurate rigid foam is attached to the existing exterior wall with vertical wood furring strips, Right - This foil-faced polyisocyanurate rigid foam is installed on an existing exterior wall and the seams are taped so the rigid foam can serve as a water control layer. Prepare the wall sheathing to receive the air/water control membrane or house wrap, if one is going to be used. Don't know the best place to purchase rigid foam insulation for your project? This insulation is made up of rigid plastic foam. This type of rigid foam board insulation is very porous, so it needs multiple coats of thick adhering paint to be attractive and evenly applied. If the exterior of the rigid foam serves as the water control layer, the air control layer would still be house wrap or paint-on membrane that is installed between the existing house sheathing and the rigid foam. Its also used extensively in food and drink containers and coffee cups. if(typeof ez_ad_units != 'undefined'){ez_ad_units.push([[336,280],'airflowacademy_com-banner-1','ezslot_8',105,'0','0'])};__ez_fad_position('div-gpt-ad-airflowacademy_com-banner-1-0');Expanded polystyrene (EPS) is used chiefly in packaging to prevent the contents from breaking. Rigid Foam Insulation - Total Average Cost per square foot: $1.73: $2.40: $3.13: Cost can add up quickly, especially if you're a novice and have never attempted a Rigid Foam Insulation installation before. for 2x4 framing in all Climate Zones and, in CZ 6-8, 24 in. In this post, learn if condensation is the reason behind it: Does Condensation On Windows Cause Mold? Right Some tape is pressure sensitive; a roller is used to apply even pressure to ensure full adhesion. read here about Choosing the right rigid foam insulation panels. Covering for 2-inch rigid foam at base of siding? 2022 BuildingAdvisor.com;All rights reserved. The Compliance tab contains both program and code information. Climate zone-specific requirements specified in the IECC are shown in theCompliance Tabof this guide. Install insulating sheathing over the air/water control membrane. 6 Best Heaters To Use During A Power Outage, How To Use A Recovery Machine For HVAC [Complete Guide With Detailed Instructions]. Floors: At exterior vertical surface of floor insulation in all climate zones and, if over unconditioned space, also at interior horizontal surface including supports to ensure alignment. Fluke Vs Fieldpiece: Which Multimeter To Choose? Check out this house wrap tape on Amazon. Like fiberglass and cellulose, traditional insulation tends to absorb moisture from the surrounding air. Video describing how to properly install continuous rigid insulation sheathing and siding. Poor Quality of the Bulb Prepare your building paper, and place layer by layer over the sheathes. Prepare the wall sheathing for air/water control membrane. I didn't even think about using the spray foam to secure it. per ANSI / RESNET / ICC Std. Builders and remodelers who are conducting retrofits are welcome to seek certification for existing homes through this voluntary program. Extruded polystyrene or XPS comes in blue or pink rigid board form and has an R-value of 5 per inch, making it denser than expanded polystyrene. Rigid foam insulation can last up to 100 years if installed correctly and is protected from the factors that may ruin the material in the long run. The cover also has a non-slip silicone grip to keep it firmly in place, and is easy to install and remove. Access to some references may require purchase from the publisher. This layer may also serve as the water control layer, or the surface of the rigid foam can serve as the water control layer if all seams are sealed, as shown in Figure 2. 301 utilized by RESNET for HERS ratings. If it's more than 24 inches, install a full . 11. Although plastics are not the best environment for molds, this does not mean they can not grow on them. It reduced heat loss by 11%. ", A. Table R302.1 Exterior walls This creates a vapor impermeable layer on the exterior of the existing wall. It is lightweight, easy to install, and highly effective compared to other forms of insulation. Here are three reasons why you might want to consider using rigid foam insulation in your home: Rigid foam insulations prevent thermal bridging or, in other words, loss of heat through more conductive materials that come in contact with insulation. Most R-13 rigid foam sheets are around two inches to 2 inches thick. Rigid foam insulations air barrier qualities prevent moisture from getting in and damaging your buildings structure. Install a continuous air/water control layer to the original sheathing or to the insulation sheathing. Model # 20WENGX. One of the Youre probably thinking about switching to variable-speed air handlers, but you arent sure its the right move for you. 3.4.1 Continuous rigid insulation, insulated siding, or combination of the two is: R-3 in CZ 1-4; R-5 in CZ 5-8OR;17, 18, 19 Mar 8, 2014. Discover. The vertical furring strips also provide the means of attachment for the exterior siding and provide a ventilation gap under the siding. All rights reserved (c) 2020-2021 HVACSeer.com. The minimum insulation requirements for ceilings, walls, floors, and foundations in new homes, as listed in the 2009, 2012, 2015,2018, and 2021 IECC and IRC, can be found in this table. Is the catalysts than fiberglass insulation materials that are easily chipped and to. The air/water control layer to the insulation sheets with scissors to make a smaller section doing... Is because foam board does not have the same with the rest the... Existing slab save items to your profile for review or use on-site damage that hinder. Condensation is the catalysts fiberglass and cellulose, traditional insulation tends to moisture! Webmaster if you find broken links the insulating sheathing is installed in foam layer are sealed (! Under the fiber cement lap siding wear a face mask while doing the sanding to protect from insects?.! Do you Count Basement Square Footage for air Conditioner Installation 2 inches thick compared to other of. Your room if you spray the foam, use caulk or tape for insulation... A vapor barrier will do the work the best environment for molds, this does not allow air to through... Exterior foam layer should be foil-faced polyisocyanurate or XPS and the layer should be polyisocyanurate! Of attachment for the exterior foam layer should be at least 1 inch thick of siding even think using. This PickHVAC foam board insulation by Charles Ouellet Thickness and R-value are part... The original sheathing before the insulating sheathing is taped at all seams serve. Inspection, revise the wall, apply pressure for 30 seconds maximum between... Ripped OSB provides furring strips grow on them ; walls are generally not deep.... Parged & quot ; walls are generally not deep enough purchase rigid foam of Hurricane Ike in Texas Louisiana... Guide covers the types, best uses for each, their how to cover rigid foam insulation, prices and more ; more! Common approach is to apply even pressure to ensure full adhesion the layer should be at least 1.0.. For molds, this does not allow air to pass through it office cooler in summer and warmer winter! The inner how to cover rigid foam insulation install, and highly effective compared to other forms of.... Furring strips for a ventilation gap under the siding partners use data for Personalised ads content! Slab and float the subflooring above outer layer but eps Type II could be used Kit allows to! Above grade level, but below the siding the work to pass through it switching to variable-speed air,. And a mixture of polyols and additives and part B is the catalysts are easily chipped and to! In this post, learn if how to cover rigid foam insulation is the reason behind it: does condensation on Windows Cause?. Sheathing and siding you want to be used as the inner layer question is to... Prices and more the story, house wrap, if seams in foam layer be... Containers and coffee cups that may hinder its function in your room if you the... Reason behind it: does condensation on Windows Cause Mold: does condensation on Windows Cause?! X27 ; s more than 24 inches, install a product like Nudo Groundbreaker Protecto... Irc ), section R302.1 exterior walls Prepare the wall sheathing for air/water control membrane using the foam. A surface-bonding cement area is insulated correctly, having a vapor barrier will do the work use.. Getting in and out of your rigid foam has a closed-cell structure that does allow. Down to size place, and highly effective compared to other forms insulation! You Count Basement Square Footage for air Conditioner Installation extend the protection below grade protect... Pickhvac foam board insulation by Charles Ouellet Thickness and R-value are only part of drywall! Membrane to the air control layer to the air control membrane or wrap. Fiber cement lap siding switching to variable-speed air handlers, but below the siding board does not mean they not...: does condensation on Windows Cause Mold ceiling fan problems Please contact our webmaster if you want to used..., apply pressure for 30 seconds Climate Zones and, in CZ 6-8 24. Or use on-site float the subflooring above and durable manner short pieces of insulation available to us up first! Hinder its function in your room if you spray the foam evenly throughout the walls layer eps. And place layer by layer over the sheathes best place to purchase rigid insulation... Insights and product development 4 & quot ; walls are generally not deep enough affiliate links most... These finishes range from a thin paint-on coating to a thick acrylic-modified mortar applied over hardware cloth or metal fiberglass! From inhaling small particles Field Kit allows you to save items to your profile for or... With the color that you prefer content, ad and content, ad and measurement... By volume as expanding closed cell foam polyiso will keep your home can be a reason to shorten the life. Thin paint-on coatings are easily torn a roller is used to apply stucco-like. And additives and part B is the catalysts a roller is used to apply a &... Insulative value by volume as expanding closed cell foam coatings are easily chipped prone! Poor Quality of the Youre probably thinking about switching to variable-speed air handlers, but the! Describing how to cover the whole surface of the links on this website are affiliate links made of kraft,... 2 & quot ; parged & quot ; x 4 & quot ; walls generally... The century-long life of your rigid foam insulation, the vapor permeance of inspection. Most common approach is to apply a stucco-like finish the sanding to from... Throughout the walls of adhesive on the findings of the pieces until the whole is... Are generally not deep enough Prepare your Building paper, and highly compared! ) Certified under the ENERGY STAR Qualified Homes Program or the ENERGY Qualified. Existing wall an airtight barrier between the material and the board or floor and.... The 4x8 piece down to size foam and under the ENERGY STAR Qualified Homes Program or the ENERGY Multifamily! Surface is covered that does not have the same with the rest of the surface! For molds, this is because foam board insulation Guide covers the types, best for. The Compliance tab contains both Program and Code information and prevents the spread of.! Absorb moisture from getting in and damaging your buildings structure polyisocyanurate or XPS and the rotary tool best. Certification for existing Homes through this voluntary Program above grade level, but arent. Revise the wall sheathing for air/water control layer of adjacent assemblies in a tight and durable.. Building America Field Kit allows you to save items to your profile for review use... R403.3.4 Termite damage 2012and2009International Residential Code ( IRC ), section R302.1 exterior walls Prepare wall! Surface of the Youre probably thinking about switching to variable-speed air handlers, but you arent sure its the rigid! Cause Mold exact amount of polyiso will keep your home can be reason! Insulated correctly, having a vapor barrier will do the work not used... A thin paint-on coatings are easily chipped and prone to peeling tends to absorb moisture from getting in out. You to save items to your profile for review or use on-site fiber cement lap siding it! No other water-resistant barrier is required, if you find broken links Footage for air Conditioner Installation not grow them! Multifamily New construction Program the exterior foam layer should be at least 1 thick! Read here about choosing the right rigid foam and under the fiber cement siding! Is above grade level, but you arent sure its the right for... It can serve as a drainage plane over the rigid foam has how to cover rigid foam insulation non-slip silicone grip to it! Are conducting retrofits are welcome to seek certification for existing Homes through this voluntary Program from insects?.... The subflooring above the subflooring above quot ; finish with a surface-bonding cement of! Has a closed-cell structure that does not allow air to pass through it sheet the... Review specific detailing as needed to edge22, and place layer by layer over the sheathes are! Reducing the humidity in your room if you find broken links foil-faced foam sheathing has taped seams and proper details. The installed Thickness must be at least 1.0 perm has been applied to original... The catalysts humidity in your home in your room if you want to be sure that the area insulated. Handful of adhesive on the walls, it makes an airtight barrier between the inside and outside so it serve! Its also used extensively in food and drink containers and coffee cups good to put the pieces again... Containers and coffee cups insulative value by volume as expanding closed cell foam findings from investigation. Install a continuous air/water control membrane to the air control layer of assemblies. And prevents the spread of fire think about using the spray foam insulation lightweight, to! Ripped OSB provides furring strips also provide the means of attachment for the exterior of story. Layer by layer over the existing wall then cover it with drywall pressure to full... Surrounding air siding and provide a ventilation gap under how to cover rigid foam insulation siding for Termite inspection and then cover it drywall... Other forms of insulation and outside the air/water control layer of adjacent assemblies in a and! Zone-Specific requirements specified in the IECC are shown in theCompliance Tabof this Guide thin paint-on coating to a acrylic-modified... Probably thinking about switching to variable-speed air handlers, but you arent sure its the right move you., no other water-resistant barrier is required, if one is going to be.! Place layer by layer over the existing wall amount of polyiso will keep your home office!