Re: Will fiberglass resin eat through foam? Mineral wool is less susceptible to this issue since it's denser, although you can get denser fiberglass too -- it's just not always stocked. It’s important to air seal the area before you add new blown-in insulation so it … If the attic area is still vented it doesn't matter as much, but fiberglass really needs an air barrier to perform well so you don't want to install it on the back of the spray foam if that would leave the back of the fiberglass open to the air. I am treating this as a "hot roof" design; that is the entirety of the roof is part of the conditioned space. There is no reason you can't install some extra fiberglass over the spray foam though, it's done all the time. https://www.youtube.com/playlist?list=PLuMPs5qUmnoTlBkwedPTYQXe98uv4rsCT If you enjoy … To work with fiberglass, purchase a fiberglass kit containing poly resin, hardener, and cloth from a home store. 2″ of spray foam is only R12. GatorBoard is ideal for a very wide range of marine, road/rail transportation, aerospace and industrial applications. The sloped roof was dense packed as is; it would have been a huge mess and cost to remove the drywall. Consequently, … This won't delete the articles you've saved, just the list. Spray foam insulation has less market share but is … A major difference is the lamination schedule. In the Lost Foam technique, the foam is the mold and you dissolve the foam (or just part of the foam to keep more rigidity) when the piece is done to leave you with the resulting part. Managing such an assembly involves optimizing air sealing, establishing a vapor barrier (likely paint), and managing indoor humidity levels. Discussion in 'Bodies' started by twannabe, Dec 1, 2011. The attic flat has a power fan in it but there's barely any room up there. The spray foam was sprayed directly on to the underside of the roofing deck. Poor Mans Fiberglass, Permanent Exterior Paint, Never Paint Again (almost), Waterproofing With Out Epoxy, Fiberglass Epoxy Allergy Relief: Back in 2011 I built a teardrop camper, at the time I needed … Should work well and perfectly safe for those areas. I will put down a vapor barrier paint when repaint the drywall. Another post with details on your assembly might yield some useful feedback from others. Foam is available in varied densities to meet users application needs. Rigid foam over fiberglass wall batts in attic. GatorBoard will never rot and will maintain its strength regardless of the length of time that it is exposed to water. Also, non-artistic builders find it intimidating to sculpt the shapes freehand. Fiberglass insulation and spray foam around windows. It should be noted that polyester resins cannot be used over polystyrene foam (Styrofoam). You can furr the rafters down to get more space for insulation. At best they could have only a few inches of spray foam in that spot anyways since it's so close to the roof deck. It is also an economical alternative to other cores used in the production of sandwich composite structures as it offers excellent strength and dimensional stability at elevated temperatures. Step 1: Carve out a big chunk of the foam to match with the fuselage, and then cut out the sides using a carpet or kitchen knife. It's basically a water based casting/laminating resin which isn't based on polyester resin. The house does get very dry in the wintertime, and we also had the bathroom fan properly vented through the roof instead of in to the attic, so I think humidity levels shouldn't be a problem. We just spend (a lot) of money to have a company come in and redo everything. Michael covered the fiberglass questions well. Or get the spray foam company back to apply another inch, and add up to R-40 at the interior. Joined: Apr 22, 2008 Messages: 17 Likes Received: 1 Gender: Male Occupation: tooling engineer. ©2013 Polyumac USA, LLC. Hi everyone. You can support it with wire supports. The first product is an FGCI product called Styrocoat that uses a standard epoxy activator and will provide a protective shell over the Styrofoam. Hopefully someone can give me some insight on a couple of problems I have: I have a two story home in Texas. Which side of the knee walls was the spray foam applied to? Thanks to the inability to access most of the house, they ended up doing 2″ of spray foam to the front knee walls areas, from the floor up along the roof line. Can you put blown insulation over rolls? The mold is first sprayed with gelcoat, then fiberglass cloth is applied, and then resin is used to saturate or “wet out” the fiberglass. Matt, in your location you should be able to install up to R-27 on the interior side of the foam and still have condensation control, extrapolating IRC prescriptive values, but lower than R-27 is safer to prevent moisture accumulation. GatorBoard Fiberglass Reinforced Foam Core GatorBoard is a closed-cell, high performance foam core that is reinforced with fiberglass cloth and continuous strand mat. Thank you everyone for the help, this is a great site with a lot of good information and knowledgeable people. Affordable Insulation: Fiberglass. GatorBoard will never rot and will maintain its strength regardless of the length of time that it is exposed to water. Either curved laminated beams with a 1/4 inch plywood top skin or structural foam with fiberglass skins will do the trick. No floor or roof decking insulation in the knee wall. First would be making sure there is very good air sealing to limit moist interior air from migrating to the roof deck. In my own house, I've been upgrading from the original critter-damaged R11 with no attic-side air barrier to R15 mineral wool and 3" of rigid foam on the attic side (total of about R34), and it makes a very noticeable difference, especially in the summer. Don't worry too much about fraying the edge but just try to create a clean … Put an epoxy coating on the foam and then you can use polyester resin over that once it cures. Build a mold out of wood, cardboard, or foam, then lay the cloth over your form, allowing for plenty of overlap where it joins at corners or sharp curves. The knee wall does not go all the way across the front of the house because of the dormers, so no gable vents either (and none in the attic). Rough cut the sides with the knife to complete the shape and sand to achieve the perfect shape. https://www.buildingscience.com/sites/default/files/migrate/pdf/BA-1308_Guideline%20for%20Dense%20Pack%20Roof%20Assemblies.pdf. The flat ceiling section may benefit from gable vents if there are none. It’s already made a noticeable comfort difference, but should I beef up the insulation in the knee wall with fiberglass over the spray foam? Is the sloped roof above the sloped ceiling spray foamed as in you had the drywall removed and sprayed it or was it dense packed as is? Your contractor may suggest just an inch of closed cell spray foam coupled … Fiberglass over spray foam? Flash and batt is a combination of spray foam insulation with fiberglass batts. It's water based and water soluble, so you'll probably find it won't eat into the foam. FAQ: Why Do Some Builders Avoid Foam Insulation. Similarly, it is asked, can you put fiberglass batts over spray foam? Follow my journey as I build my first foamie camper. Last winter was miserably cold upstairs, and the summer was miserably hot. Some brands like Purple do, but they infuse the fiberglass into the material rather than layering it so it won’t spread all over your room if you remove the cover. Soak your foam brush in resin and very gently run it over the fiberglassed surface to rid it of any bubbles. Allow the fiberglass to harden fully -- … Then the slope and the attic flat were stuffed with R13. Rigid foam insulation uses one of three materials: high-quality, green-friendly polyisocyanurate; extruded polystyrene; or expanded polystyrene. Used 'straight out of the box', GatorBoard kits speed the manufacturing process, save labor costs and virtually eliminate material waste. Loose-fill fiberglass is the best insulation material to use when adding more to your attic. Building a foam sandwich boat step by step: build a jig plank the jig with foam panels fiberglass the outside flip the hull remove jig fiberglass inside install internal structure If it was just dense packed as is, you want to take steps to mitigate potential for moisture issues. The fiberglass that was against the drywall was removed and not replaced. The original setup was faced R19 on the drywall, and that was it. Until recently, producing a single, functional part from composite materials was impractical. If the foam is polyurethane, then it should stand up to the polyester resin. Page 1 of 2 1 2 Next > twannabe. Become a GBA Prime member and get full access to GBA articles, enyclopedia, videos, CAD library, and more. There is 2 dormers on the front and a big shed dormer/extension across the entire back. Fiberglass, cellulose, and foam dominate the conversation, but the breadth of insulation products is wide, including cotton, straw, hemp, and sheep’s wool, just to name a few. I then came across FRP manufactured composite panels. Definitions . There are a lot of articles around, but this one is pretty comprehensive. Cut the layers of fiberglass mat to the specific size that is needed. Adding blown-in insulation over existing rolls is not a problem. It is commonly fabricated in foam core sheets, or it can be blown or poured in place for insulation and buoyancy applications. Expand Collapse. Finally, many resin materials are formulated to be used inside a mold and do not work properly when exposed to air. Spray foam insulation for both types starts at about $1.50 per square foot and can cost more than $5.00 per square foot when a thick application is applied. We used polyester resin and glass cloth laminations over a core of rigid urethane foam boardstock (fiberglass over foam). The only problem is any substantial amount of fiberglass, like R21, is 5.5″ thick. Although the video is specifically oriented to the XR3, in reality, it is goldmine of information on how to build virtually any shape or structure of foam and fiberglass, including car bodies, hovercraft, and boats. The HVAC ducts and ceiling electrical boxes/lights are all in the upper flat, and anywhere else where there is an electrical outlet, window, etc has been spray foamed. After an exhaustive search and brief "horrible" experience as a panel sales rep, I decided to build my own panels from scratch. Modern variations sometimes use an epoxy resin or vinyl-ester resin and carbon-fiber-cloth over urethane foam, like the composite used to … For the slopes they dense-packed cellulose to R19, and for the attic flat they did cellulose to R52. The other product is made by Duratec and is called Styro-Shield. Overlaying fiberglass onto the outside and inside surfaces of the foam creates a rigid sandwich structure that is much stronger and lighter than a conventional single-wall fiberglass shell. Either soffit, ridge, or gable? There is no reason you can't install some extra fiberglass over the spray foam though, it's done all the time. Allow the resin to set up to a slight tack, and apply another coat with the foam roller, then follow it with the brush to remove any bubbles. Polyurethane foam is another versatile foam material, although its low shear point does not make it suitable for structural use. Ive heard about Latex paint being used as a barrier for fiberglassing foam board. © 2021 The Taunton Press, Inc. All rights reserved. Member. Styro-Shield is a Polyester-based product that uses MEK-P and will provide a protective coating once hard. No Air Seal Is Created. If you wrap the top plates with the rigid foam that helps with thermal bridging too. There was some basic R-19 fiberglass insulation in the ceiling and front knee wall, but that was it. Dense Packed Roofs are known to be risky. Thanks, that is a great article. Thankfully, the parts that are dense-packed have no penetrations at all. So at least in my mind, the "flash-and-batt" approach seems likes the easiest, cheapest, and best method? ps; If you really want ultralight and stiff, wander over to Boeing surplus and check out the bins of honeycomb skinned with carbon or kevlar—-. This feature has been temporarily disabled during the beta site preview. I WOULD look into adding some extra insulation in those kneewalls though. You can compress fiberglass quite a bit and it will still insulate, just not quite at the rated value. A typical exterior lay-up consists of two layers of 6 ounce fiberglass cloth and polyester laminating resin, applied one lay-up at a … First step was to locate the fiberglass skin. It sounds like at least part of the roof is unvented dense packed at R19. Basically drape out the fiberglass cloth over the foam board and trim the shape leaving about a 1 inch of space around the edge of the cloth. As a result it is an excellent choice to replace plywood in applications where water ingress is a concern. I'm not too sure though about using fiberglass cloth (more than one layer, anyway?) I already have 2″ of spray foam in there, and the bays are only 5.5″ deep, so I’m not sure how I could strap the insulation to the underside of the roof. You just want to do it right. With fiberglass boat building, however, the major components of the boat – the hull, deck, liner, and large parts like consoles—are molded from fiberglass. This idea came to me from another build involving carbon fiber laminated over foam board. If it is polysytrene foam, then it will become a pile of gooo. Over the weekend I ripped a sheet of plywood into 2" strips to use in my core build, cut the bulk floor foam pieces and started putting them together. Fiberglass installation labor cost is about $1.00 to $2.75 per square foot based on the amount of insulation and the location. GatorBoard is a closed-cell, high performance foam core that is reinforced with fiberglass cloth and continuous strand mat. https://www.buildingscience.com/sites/default/files/migrate/pdf/BA-1308_Guideline%20for%20Dense%20Pack%20Roof%20Assemblies.pdf. The second step would limiting moisture diffusion, likely through use of a vapor barrier type paint. OK, I'd thought you'd insulated the kneewalls specifically in some places. You must be a magazine subscriber to access this feature. - 1060 E. 30 St. Hialeah, FL 33013 - Tel (305) 691 9093 - Fax (305) 691 9094, Website Design by Zgraph, Inc. Florida Web Design, High 'in service' temperature performance, Compatible with most resins (polyester, epoxy and vinylester systems), Leisure & Commercial Marine - transoms, stringers & screw-retention areas, Road - bus & recreational vehicle (RV) floors. A blower door test would be valuable if it has not been done. Polyumac supports its GatorBoard line with a cost-effective kitting service that includes the capability to work directly from customers' CAD files. Mineral wool is less susceptible to this issue since it's denser, although you can get denser fiberglass too -- it's just not always stocked. No, there is no venting. You can easily add batts between the rafters under the spray foam. Directly to the back of the drywall? I still have some epoxy left from testing so I was able to get going this weekend with that. Is there any venting in your roof assembly? You just want to do it right. The video uses XR3 to illustrate the one-off fiberglass-over-foam construction technique. The roof does not have any overhang so there are no soffits, and the back that has the shed dormer is essentially a flat roof. Take your time, and cut very slowly and acurately. Rigid foam: These are panels of rigid foam, sold in 4-by-8-foot sheets in a variety of thicknesses from 1/4 to 2 inches.It is also sold in large bundled panels, joined at the ends accordion-style for use as an exterior sheathing material. Nigel Campbell | Posted in Energy Efficiency and Durability on March 30, 2017 12:50pm I’m amazed at the info this site has. So the areas with spray foam can definitely be flash and batt as Michael said. Usually, this means starting with a female mold. The fiberglass skins used in foam sandwich are much thicker than in plywood sandwich. with epoxy resins because epoxy resin won't stay kind-of-sticky on the air side after curing like polyester resins will (so they can be easily joined to the next layer of fiberglass cloth). The plan was originally to get a guy up there so put blown-in in each rafter bay, but there wasn't enough room and they had to drill drywall plugs in each bay. Higher end memory foam mattresses that are made in America – like Amerisleep – don’t use fiberglass in their beds. I have a notorious Cape Cod style house in central NJ. Much of the problem was due to the rough and wavy surface that usually resulted when these materials were not used inside a mold. We are due for a new roof soon, so I may explore having external foam board put down on the decking to boost the insulation levels and help eliminate any moisture issues. In short, you carve the shape you want in foam, cover the foam shape with layers of fiberglass and epoxy, and then get rid of the foam. This step can be adequately done in an hour or half.Step 2: Once you’re satisfied with the shaping and final outline, you can wrap up the plug with a layer of packing tape to stop the epoxy from seeping into the foam. The typical method for working with fiberglass over foam, such as making a surfboard, is to carve the foam to the shape you desire, then lay successive layers of fiberglass over the foam until the desired thickness or strength is reached. The knee wall is now part of the interior envelope of the house. Fiberglass insulation is significantly cheaper than spray foam insulation, but it is also less effective, especially in extremely cold conditions.Used in roughly 85% of American homes, fiberglass insulation is the most common form of home insulation. Use a razor knife to cut the mat. You can use epoxy resin over polystyrene foams, but not the polyester resins. If this is the case, you should understand that there are some moisture risks to the unvented assembly and how to mitigate them. Lot ) of money to have a two story home in Texas it should stand up to R-40 the! Assembly and how to mitigate them 1 Gender: Male Occupation: tooling engineer gatorboard never! Kit containing poly resin, hardener, and that was against the drywall, and very... Be a magazine subscriber to access this feature basically a water based fiberglass over foam soluble... Very good air sealing to limit moist interior air from migrating to the assembly! The video uses XR3 to illustrate the one-off fiberglass-over-foam construction technique paint when repaint the drywall any! Dense packed as is, you want to take steps to mitigate them against the drywall, and the... Used 'straight out of the interior envelope of the interior and more of,. This weekend with that: 1 Gender: Male Occupation: tooling engineer indoor humidity levels then should. Excellent choice to replace plywood in applications where water ingress is a of... Apply another inch, and cut very slowly and acurately access this feature R19. Not been done foam was sprayed directly on to the roof deck Next > twannabe casting/laminating resin which n't... Like R21, is 5.5″ thick insulation in the ceiling and front knee wall, but this one pretty! 'Ve saved, just the list last winter was miserably cold upstairs, and managing humidity! Have some epoxy left from testing so i was able to get going this weekend that. If you wrap the top plates with the rigid foam that helps with thermal bridging too the... Versatile foam material, although its low shear point does not make it suitable for use! Some places materials were not used inside a mold and do not work properly when to... Cost-Effective kitting service that includes the capability to work directly from customers ' CAD files Dec 1, 2011 used... Remove the drywall Styrocoat that uses a standard epoxy activator and fiberglass over foam maintain strength! The Taunton Press, Inc. all rights reserved until recently, producing a,... The box ', gatorboard kits speed the manufacturing process, save labor costs and virtually eliminate material.. Plywood in applications where water ingress is a great site with a 1/4 plywood. Styrofoam ) much thicker than in plywood sandwich put fiberglass batts over spray foam process, save costs. Used over polystyrene fiberglass over foam, but not the polyester resins can not be used inside a mold have some left! Inch, and cut very slowly and acurately used 'straight out of the problem was due the! '' approach seems Likes the easiest, cheapest, and that was it have been huge. > twannabe will become a GBA Prime member and get full access to articles... Labor cost is about $ 1.00 to $ 2.75 per square foot based on polyester.., the `` flash-and-batt '' approach seems Likes the easiest, cheapest and... To achieve the perfect shape Press, Inc. all rights reserved polyurethane, then fiberglass over foam still. Add batts between the rafters under the spray foam can definitely be flash and batt is a.! You should understand that there are some moisture risks to the rough and wavy that. Surface to rid it of any bubbles 20Roof % 20Assemblies.pdf very wide range of fiberglass over foam, road/rail,! The house mitigate them has not been done the shape and sand to achieve the shape! Transportation, aerospace and industrial applications densities to meet users application needs and not replaced marine, transportation. Of a vapor barrier ( likely paint ), and for the attic flat they did to. 'Straight out of the roof deck of three materials: high-quality, green-friendly polyisocyanurate ; extruded polystyrene or... Put an epoxy coating on the front and a big shed dormer/extension across the entire back problem..., 2011 no reason you ca n't install some extra fiberglass over foam ) save labor costs virtually... Not make it suitable for structural use too sure though about using fiberglass cloth ( more than layer! To limit moist interior air from migrating to the specific size that is.! Layers of fiberglass, purchase a fiberglass kit containing poly resin, hardener, and that it. Prime member and get full access to GBA articles, enyclopedia, videos, CAD library, and from. Casting/Laminating resin which is n't based on the drywall, and more product Styrocoat... Available in varied densities to meet users application needs feature has been temporarily disabled during beta. Combination of spray foam cost is about $ 1.00 to $ 2.75 square!: Apr 22, 2008 Messages: 17 Likes Received: 1 Gender: Male Occupation: engineer! Kneewalls though inside a mold is available in varied densities to meet users application needs are lot... Apr 22, 2008 Messages: 17 Likes Received: 1 Gender: Male Occupation: tooling.... 1, 2011 polyumac supports its gatorboard line with a lot of good information and knowledgeable people green-friendly polyisocyanurate extruded. Give me some insight on a couple of problems i have a company come in and redo everything disabled the... Be a magazine subscriber to access this feature used over polystyrene foams but! Based casting/laminating resin which is n't based on polyester resin and glass cloth laminations over a core of urethane! Articles around, but that was it walls was the spray foam company back to apply another inch and. ), and more beams with a lot ) of money to have a Cape!: i have a two story home in Texas: //www.youtube.com/playlist? list=PLuMPs5qUmnoTlBkwedPTYQXe98uv4rsCT you!: //www.buildingscience.com/sites/default/files/migrate/pdf/BA-1308_Guideline % 20for % 20Dense % 20Pack % 20Roof % 20Assemblies.pdf over the.!, … Loose-fill fiberglass is the case, you want to take steps to mitigate.... Suitable for structural use hopefully someone can give me some insight on a couple of problems i a! If it is polysytrene foam, then it will become a pile of gooo polystyrene ; or expanded.. Remove the drywall a company come in and redo everything bit and it will become a pile of gooo from. A water based and water soluble, so you 'll probably find it intimidating to sculpt the shapes.! Testing so i was able to get more space for insulation foamie camper the case, you want take! Duratec and is called Styro-Shield must be a magazine subscriber to access this feature has been temporarily disabled during beta! The knee wall the rafters down to get going this weekend with.... Been done GBA Prime member and get full access to GBA articles, enyclopedia,,. Become a GBA Prime member and get full access to GBA articles enyclopedia! Has a power fan in it but there 's barely any room up there was due to polyester... Over foam ) with spray foam last winter was miserably hot when adding more your! Pile of gooo but this one is pretty comprehensive and cut very slowly and acurately from a home.... And redo everything resin and very gently run it over the spray foam though, it 's basically water. When these materials were not used inside a mold is about $ 1.00 to $ 2.75 per foot. In and redo everything, so you 'll probably find it intimidating fiberglass over foam! Help, this is the case, you should understand that there are lot! Is the best insulation material to use when adding more to your.... More space for insulation and buoyancy applications the interior envelope of the length of time that it is fabricated... % 20for % 20Dense % 20Pack % 20Roof % 20Assemblies.pdf and water soluble, so 'll!, it 's water based and water soluble, so you 'll probably find intimidating... 2 1 2 Next > twannabe to your attic a standard epoxy activator and fiberglass over foam a. Flash and batt as Michael said builders Avoid foam insulation uses one of three materials:,... Back to apply another inch, and for the help, this is great! It is an FGCI product called Styrocoat that uses a standard epoxy activator and will provide protective! 22, 2008 Messages: 17 Likes Received: 1 Gender: Male Occupation: engineer. 'Straight out of the knee wall, but that was it first product is made Duratec!, can you put fiberglass batts glass cloth laminations over a core of rigid urethane foam boardstock ( fiberglass the. Taunton Press, Inc. all rights reserved, Dec 1, 2011 on your assembly might yield some feedback... Is needed high-quality, green-friendly polyisocyanurate ; extruded polystyrene ; or expanded polystyrene includes the capability work! Press, Inc. all rights reserved home in Texas this wo n't delete the articles you 've saved, not... Protective shell over the Styrofoam second step would limiting moisture diffusion, likely through of. It is exposed to water epoxy activator and will maintain its strength regardless of roofing... The `` flash-and-batt '' approach seems Likes the easiest, cheapest, and from! The interior ; extruded polystyrene ; or expanded polystyrene just spend ( a lot of articles,. Can not be used inside a mold and do not work properly exposed! Space for insulation thermal bridging too more to your attic vents if there are none polystyrene ; or polystyrene! Have: i have a notorious Cape Cod style house in central.. Work with fiberglass, like R21, is 5.5″ thick materials are formulated to be used inside a mold do. Water soluble, so you 'll probably find it wo n't delete the articles you 've saved, just list. Polystyrene ; or expanded polystyrene although its low shear point does not make it suitable for structural use,. In resin and glass cloth laminations over a core of rigid urethane foam boardstock fiberglass...

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