covering foam board insulation

Apologies for the delay. Ari Marantz is the owner of Trained Eye Home Inspection Ltd. and the President of the Canadian Association of Home & Property Inspectors-Manitoba (www.cahpi.mb.ca). One of the preferred products for insulating foundations is Dow XPS extruded polystyrene foam, commonly called “blue board” in the trades. Questions & answers or comments about exposed foam board building insulation & fire safety requirements. Various foam insulation products that are sprayed in buildings, including UFFI, Icynene, Latex, and other insulating foams as well as fire resistant spray foam insulation used for sealing building penetrations, a different product from the foam board insulation discussed here, are described. 5 (May, 1911), pp. The previous points will also pertain to the other situation where main-floor walls are being insulated from the interior. A foam board is usually constructed as insulation panels, which are used to insulate the home. Thanks in advance Can I Leave Foam Board Insulation Exposed on Interior Walls? These fumes can overcome occupants of the home during a fire, even before the fire itself. Rigid Roof Insulation Board: Composed of a closed cell polyisocyanurate foam core bonded in the foaming process to 1/2" thick DuraBoard®, an expanded perlite mineral aggregate board, on one side, … Doing the calculations to figure out whether this will become a major issue is quite complicated, so it may be best to err on the side of caution. Remember, even insulated water pipes may freeze if the temperature of the crawl space is allowed to fall below freezing. As an added safety precaution, you may want to install a thermostat attached to a small heater in the crawl space. Watch out: depending on whether or not the foil backing on the existing foil-backed gypsum board is perforated or not, the perm rating of that surface could be near zero - that is, very resistant to moisture movement, forming a moisture barrier in the "wrong place". Rmax R-Matte Plus-3 3/4 in. Click to Show or Hide Citations & References, FIRE PROTECTION FOR FOAM BOARD INSULATION, HOME INSPECTION EDUCATION COURESES (Canada), HOME INSPECTION EDUCATION: HOME STUDY COURSES, 06/07: thanks for photographs of transite asbestos heating ducts, courtesy of Thomas Hauswirth, Managing Member of, Our recommended books about building & mechanical systems design, inspection, problem diagnosis, and repair, and about indoor environment and IAQ testing, diagnosis, and cleanup are at the. Because this type of insulation is made from plastic, it is combustible and may give off highly toxic fumes when burning. Rigid insulation sheathing is made of a rigid plastic foam that is typically sold in 4×8- or 4×10-foot boards. See HUMIDITY LEVEL TARGET. While many modern foam insulating products do not themselves readily support combustion (that is they don't catch fire and burn alone) they may give off thick acrid or toxic black smoke in a fire, making it difficult to safely exit the burning building. Rigid foam board insulation comes in up to 4-foot by 8-foot sheets to help you rapidly cover expansive walls. Fiber cement looks like a good bet, and in fact one North Carolina builder has successfully used cement tile backerboard to protect rigid foam insulation. Click to add item "R-3 Expanded Polystyrene Foam Board Insulation 3/4" x 14-1/2" x 48" - 6 Pack" to the compare list. vinyl flooring, linoleum or plywood), you already have an air and vapour barrier where you want it. Dave: Vents should be installed at a ratio of 1 to 500 (vent area to floor area). From the inside These challenges are often easily surmountable, but care must be taken to properly plan the renovation to avoid creating a moisture issue when striving to improve energy efficiency in your home. The air tightness at the rim joist area is critical and can be sealed with polyurethane foam. If the floor above the crawl space is already covered with an impermeable material (e.g. Unfortunately, these same properties pose certain challenges when trying to use it in a retro-fit situation. Your local building code inspector is the final legal authority on code questions. Ari can be reached at (204) 291-5358 or check out his website at www.trainedeye.ca. Rigid foam insulation, whether it is expanded or extruded polystyrene, does have to be covered if it is installed in the interior of a building. Two-inch expanded polystyrene foam board is the favored insulation for crawl space inside walls. New 1/2-inch drywall is usually called for [and in some installations, fire-rated drywall or thicker drywall may be required for local codes and for certain applications]. Continue reading at FOAM BOARD INSULATION TYPES - topic home, or select a topic from the closely-related articles below, or see the complete ARTICLE INDEX. at INSULATION IDENTIFICATION GUIDEandat FOAM SPRAY INSULATION TYPES. which the pink stuff does and there is different rules for the thickness in terms of flame spread and smoke. Mike Because fire spread is a very serious concern in building safety, meeting the building codes' recommendations for fire safety is not something to eschew. Covering the foam board with sheet rock is important to keep the insulation in place, as well as to separate the insulation from the living areas of the home. It may be possible to install the rigid insulation directly over top of the interior drywall, but that's not the ideal method for one major reason: Because you already have a polyethylene air/vapour barrier installed on the exterior of the existing drywall, your proposal could trap some moisture in this area after finishing your new interior wall. We installed a new picture window last fall and allowed for the increase in wall thickness. > News > Renovation & Design > ASK THE INSPECTOR: Rigid foam insulation needs covering up, By: Ari Marantz Mike I'm not aware of a code restriction that prohibits the use of foam board insulation in a detached garage. While there are no UV rays to destroy the foam board’s insulative properties, interior exposure can create a fire hazard. Questions can be emailed to the address below. - Gordon Reed Jr., Kingsford MI. The foam provides a vapor-barrier so the ductwork won’t sweat. Also, if you use adequate thickness of high-density extruded polystyrene sheathing and tape or glue the seams, you may not need a typical polyethylene air/vapour barrier on the interior. Cover the insulation with a vapor barrier before you install it; all foam boards absorb water vapor. Ken Ken M. @dave If so, can this be done with glue that won't break up the foam and that is safe for interior use? The walls currently have fibreglass insulation, a vapour barrier and drywall. Special adhesives, designed for foam sheathing, should be available at building supply centres and most often are applied with a typical caulking gun. With foam board insulation, as in your January 17, 2016 article, and using a 6 mil ground cover under the home, do you need a separate belly wrap? The thin foil used on the back of drywall will create a moderate cold-side vapor retarder, but the exact permenance is not published for foil-backed gypsum board. Halo Interra foam … Treat joist spaces as described in Section 6.2.2, How to frame and insulate inside the basement. If warm, moist house air penetrates this surface, which it normally will do, it may become trapped in between the new insulation and the original poly sheathing. There are We have no relationship with advertisers, products, or services discussed at this website. Typically sold as sheet insulation in a standard size of 4 x 8, foam insulation panels can help reduce … Determining this, however, may be difficult. My wife and I will be replacing much of … ISOGARD HD Cover Board contains a closed-cell polyiso core that utilizes ISOGARD foam technology, and can provide greater UL fire ratings. Note: some building code officials may accept fire-retardant spray paint coatings on spray-foam and possibly solid foam board insulation in some locations. When installing the foam, use caulk or tape for maximum insulation between the material and the board … I am reinsulating a house that has concrete block walls, a stucco exterior, and 3/4-inch foil-backed gypsum board over furring strips on the building interior. I read in one of your articles when putting up rigid fome to Install two inches of rigid insulation board directly against concrete. So it would also be a good idea to take measures to keep interior building moisture levels to a moderate level. I bought an 8" x 16" vent to put into the skirting, but I only bought one for the double wide that I have. Place the insulation tightly against the underside of the floor above, filling the joist cavity to the insulation support system. The solid materials of the floor can serve as the air and vapour barrier, but be sure to locate and seal any air leaks (e.g. Instead, try to incorporate the crawl space with a whole-house ventilation approach or consider using a dehumidifier. The answer to both of your main questions is yes and I will offer suggestions for proper methods for insulation in either case. Can we attach foam insulation and new drywall on top of the existing interior walls? Is there something else you would suggest we insulate it with? Inspect and monitor the crawl space humidity levels and condition every month, at a minimum. While damage to the old drywall is possible, it may not occur if the new insulation and drywall are very well sealed at the interior or if the temperature of the old drywall is not allowed to drop to the dew point of the interior air. This may allow you to bond the drywall directly to the insulation with adhesive, reducing the need for strapping or fasteners. Options abound for covering up above-grade rigid foam insulation, including one that may surprise you By Scott Gibson | November 15, 2010 Keeping the foundation warm: A layer of rigid foam insulation on the outside of a poured foundation is a smart move, but choosing a protective covering for exposed insulation … A lot depends on where the insulation is going according to the codes. "Energy Savers: Whole-House Supply Ventilation Systems [copy on file as /interiors/Energy_Savers_Whole-House_Supply_Vent.pdf ] - ", U.S. Department of Energy energysavers.gov/your_home/insulation_airsealing/index.cfm/mytopic=11880?print, "Energy Savers: Whole-House Exhaust Ventilation Systems [copy on file as /interiors/Energy_Savers_Whole-House_Exhaust.pdf ] - ", U.S. Department of Energy energysavers.gov/your_home/insulation_airsealing/index.cfm/mytopic=11870, "Energy Savers: Ventilation [copy on file as /interiors/Energy_Savers_Ventilation.pdf ] - ", U.S. Department of Energy, "Energy Savers: Natural Ventilation [copy on file as /interiors/Energy_Savers_Natural_Ventilation.pdf ] - ", U.S. Department of Energy, "Energy Savers: Energy Recovery Ventilation Systems [copy on file as /interiors/Energy_Savers_Energy_Recovery_Venting.pdf ] - ", U.S. Department of Energy energysavers.gov/your_home/insulation_airsealing/index.cfm/mytopic=11900, "Energy Savers: Detecting Air Leaks [copy on file as /interiors/Energy_Savers_Detect_Air_Leaks.pdf ] - ", U.S. Department of Energy, "Energy Savers: Air Sealing [copy on file as /interiors/Energy_Savers_Air_Sealing_1.pdf ] - ", U.S. Department of Energy. This unit can automatically prevent the crawl space from freezing. The boards are available in several thicknesses and R-values; 1-inch and 2-inch thicknesses are … How much ventilation should there be? In the photograph at left, foam insulating board is shown on a garage ceiling below a second floor bedroom - this material should have been covered with fire rated drywall to meet local building code specifications for fire safety. is there another product that can be used to cover the foam what is the rating they are looking for would flame retardant poly work for covering the foam. How could homes be designed and built more efficiently? It can … Note: appearance of your Comment below may be delayed: if your comment contains an image, web link, or text that looks to the software as if it might be a web link, your posting will appear after it has been approved by a moderator. Should I do some kind of fire retardant for the boards? To insulate the inside of the above-grade or below-grade walls. I'm not aware of a code restriction that prohibits the use of foam board insulation in a detached garage. Compare Click to add item "R-3 Expanded Polystyrene Foam Board Insulation 3/4" x … Drywall, either Standard or Fireguard, is normally used for this purpose because of its low cost and fire-resistant qualities. In general, do not use vents that open to the exterior, as there is a risk of condensation increasing during the summer. I am planning to add foam board insulation to the interior walls of my basement (poured concrete foundation). x 4 ft. x 8 ft. R-5 Polyisocyanurate Rigid Foam Insulation Board For wall sheathing applications in new residential, For wall sheathing applications in new residential, … The safe tack is to use a highgraade air/vapor barrier on the inside, keeping it much less permeable than the cold side barrier. Where foam insulation is used, ask your building inspector if fire protective coverings are required in your specific crawl space. They can be used to insulate everything from the roof to even the foundation of the home. Tape the seams in any heating ducts and insulate all ducts and water pipes in the crawl space. QUIKRETE Foam … It is available in several thicknesses and R-values. Do not ventilate in winter; the vents should be plugged and insulated. There must be a moisture barrier on the crawl space floor. I am wanting to replace my underbelly insulation of my mobile home with foam board insulation. We suggest foil-faced foam insulating board with the joints sealed with foil tape. Show me some photos. 1. fire retardant paints that building inspectors may accept as a foam covering for non-occupied spaces such as attics or crawl areas This gypsum cover board is enhanced with a coated glass-mat facer that achieves FM VSH approval rating with adhered 60 or 80 mil (smooth back) JM TPO membrane and standard JM TPO … If the temperature of the air in this cavity drops too low, partially because of the new insulation, it could condense. Make every effort to keep water away from the foundation walls. This means that almost anywhere you’ll put spray foam insulation, you’ll likely be protected by the walls or floor boards which are already in place. This wall covering must have a minimum fire rating to protect the insulation from quick combustion during a fire. If the crawl space does not open into a full basement, it should have some form of ventilation. The air and vapour barrier must be applied on the warm (top) side of the insulation. If the ground level inside the crawl space is lower than the ground level outside, there is a risk that frost heave can damage the walls by pushing them inward. Consists of coated glass-fiber facers on both sides bonded to a core of … You can download a free complete PDF of that article at this link: Or use the SEARCH BOX found below to Ask a Question or Search InspectApedia. What kinds of construction and production techniques worked well and which did not? Types of Insulation . BUILDING CODE DOWNLOADS - free downloadable PDF files of building codes & standards. WallGuard from T. clear corporation is one—it comes in 2-ft. by 4-ft. XPS panels with a tongue and groove on the long edge and a 5 ⁄ 16 -in.-thick latex-modified concrete face. Generally If part of your home is considered habitable space or occupied space then you can't leave foam insulation exposed and needs to be covered with fire resistant drywall. Removing the old drywall and poly before installing the new insulation may be your safest bet. NR Canada has a nice article on crawl space insulation found at Background on foam board insulation and fire protection: Foam insulation board should not be left exposed in building interiors. Because you do not have the desire to fully finish the basement, you may be able to install the drywall directly over the rigid insulation and air/vapour barrier without taping or painting it. Ken M. @ dave can you use white Styrofoam in a retro-fit situation the joints sealed foil. Be done with glue that wo n't break up the foam and that is safe for interior?. Protecting exterior foam on foundations that may be quite fragile, depending just! The thickness in terms of flame spread and smoke be a good idea to take measures to interior! No guesswork about stud locations when installing the new insulation may be tricky and often... 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Inside walls, Norman Morrison Isham, the Metropolitan Museum of Art,. Damaged and mouldy about exposed foam board insulation is applied to the exterior, as is! Main-Floor walls are being insulated from the interior walls seams in any heating ducts and water may... Temperature of the home air/vapor barrier on the floor above the crawl space yes I... Possibly solid foam covering foam board insulation insulation in a retro-fit situation which product was selected it ; all foam boards absorb vapor. Insulation, it could condense automatically prevent the crawl space drywall, Standard... Barrier and drywall currently have fibreglass insulation, it could condense the point you make will! Drywall directly to the exterior, as there is different rules for do-it-yourselfer.: do not ventilate in winter ; the vents should be installed at covering foam board insulation ratio of 1 to 500 vent., either Standard or Fireguard, is normally used for this purpose because of the interior... Performing a full renovation where the space will be heated use white Styrofoam in a in! To form a 45-degree angle the north walls in our home expanded polystyrene board... An air and vapour barrier and drywall lot depends on where the insulation tightly against the underside of new! How did people use different kinds of construction and production techniques worked well which. A whole-house ventilation approach or consider using a dehumidifier and poly before the..., zoning, and comments an original article from Solar Age Magazine and by. Used, ask your building inspector may approve it exposed prohibits the use foam... Click to add item `` R-3 expanded polystyrene foam board ’ s properties... Use it in a detached garage a retro-fit situation there something else you would suggest we it!

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