No Air Seal Is Created. - 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. Thankfully, the parts that are dense-packed have no penetrations at all. First step was to locate the fiberglass skin. Nigel Campbell | Posted in Energy Efficiency and Durability on March 30, 2017 12:50pm I’m amazed at the info this site has. Become a GBA Prime member and get full access to GBA articles, enyclopedia, videos, CAD library, and more. Much of the problem was due to the rough and wavy surface that usually resulted when these materials were not used inside a mold. 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. Hopefully someone can give me some insight on a couple of problems I have: I have a two story home in Texas. Usually, this means starting with a female mold. Allow the fiberglass to harden fully -- … There was some basic R-19 fiberglass insulation in the ceiling and front knee wall, but that was it. Discussion in 'Bodies' started by twannabe, Dec 1, 2011. You just want to do it right. This idea came to me from another build involving carbon fiber laminated over foam board. GatorBoard is ideal for a very wide range of marine, road/rail transportation, aerospace and industrial applications. Fiberglass insulation and spray foam around windows. 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. Thanks, that is a great article. 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). GatorBoard Fiberglass Reinforced Foam Core GatorBoard is a closed-cell, high performance foam core that is reinforced with fiberglass cloth and continuous strand mat. 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. If it is polysytrene foam, then it will become a pile of gooo. 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). 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. Then the slope and the attic flat were stuffed with R13. Consequently, … Used 'straight out of the box', GatorBoard kits speed the manufacturing process, save labor costs and virtually eliminate material waste. Either soffit, ridge, or gable? If this is the case, you should understand that there are some moisture risks to the unvented assembly and how to mitigate them. To work with fiberglass, purchase a fiberglass kit containing poly resin, hardener, and cloth from a home store. You must be a magazine subscriber to access this feature. https://www.buildingscience.com/sites/default/files/migrate/pdf/BA-1308_Guideline%20for%20Dense%20Pack%20Roof%20Assemblies.pdf. The attic flat has a power fan in it but there's barely any room up there. 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. 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. There is no reason you can't install some extra fiberglass over the spray foam though, it's done all the time. Member. Last winter was miserably cold upstairs, and the summer was miserably hot. 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. https://www.buildingscience.com/sites/default/files/migrate/pdf/BA-1308_Guideline%20for%20Dense%20Pack%20Roof%20Assemblies.pdf. With fiberglass boat building, however, the major components of the boat – the hull, deck, liner, and large parts like consoles—are molded from fiberglass. Polyurethane foam is another versatile foam material, although its low shear point does not make it suitable for structural use. The flat ceiling section may benefit from gable vents if there are none. I WOULD look into adding some extra insulation in those kneewalls though. I am treating this as a "hot roof" design; that is the entirety of the roof is part of the conditioned space. GatorBoard will never rot and will maintain its strength regardless of the length of time that it is exposed to water. It's water based and water soluble, so you'll probably find it won't eat into the foam. Fiberglass over spray foam? The only problem is any substantial amount of fiberglass, like R21, is 5.5″ thick. The sloped roof was dense packed as is; it would have been a huge mess and cost to remove the drywall. Or get the spray foam company back to apply another inch, and add up to R-40 at the interior. Rigid foam insulation uses one of three materials: high-quality, green-friendly polyisocyanurate; extruded polystyrene; or expanded polystyrene. Dense Packed Roofs are known to be risky. 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. Finally, many resin materials are formulated to be used inside a mold and do not work properly when exposed to air. Is there any venting in your roof assembly? Another post with details on your assembly might yield some useful feedback from others. © 2021 The Taunton Press, Inc. All rights reserved. No floor or roof decking insulation in the knee wall. Put an epoxy coating on the foam and then you can use polyester resin over that once it cures. The original setup was faced R19 on the drywall, and that was it. 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. The video uses XR3 to illustrate the one-off fiberglass-over-foam construction technique. No, there is no venting. Fiberglass installation labor cost is about $1.00 to $2.75 per square foot based on the amount of insulation and the location. Don't worry too much about fraying the edge but just try to create a clean … We just spend (a lot) of money to have a company come in and redo everything. For the slopes they dense-packed cellulose to R19, and for the attic flat they did cellulose to R52. 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. As a result it is an excellent choice to replace plywood in applications where water ingress is a concern. If you wrap the top plates with the rigid foam that helps with thermal bridging too. You can furr the rafters down to get more space for insulation. After an exhaustive search and brief "horrible" experience as a panel sales rep, I decided to build my own panels from scratch. The spray foam was sprayed directly on to the underside of the roofing deck. Higher end memory foam mattresses that are made in America – like Amerisleep – don’t use fiberglass in their beds. 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. First would be making sure there is very good air sealing to limit moist interior air from migrating to the roof deck. 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. 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. 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 … Use a razor knife to cut the mat. I will put down a vapor barrier paint when repaint the drywall. 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. Which side of the knee walls was the spray foam applied to? The fiberglass that was against the drywall was removed and not replaced. 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. You can use epoxy resin over polystyrene foams, but not the polyester resins. 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. Take your time, and cut very slowly and acurately. Rough cut the sides with the knife to complete the shape and sand to achieve the perfect shape. It should be noted that polyester resins cannot be used over polystyrene foam (Styrofoam). If it was just dense packed as is, you want to take steps to mitigate potential for moisture issues. Your contractor may suggest just an inch of closed cell spray foam coupled … 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 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—-. Michael covered the fiberglass questions well. Affordable Insulation: Fiberglass. FAQ: Why Do Some Builders Avoid Foam Insulation. GatorBoard is a closed-cell, high performance foam core that is reinforced with fiberglass cloth and continuous strand mat. I'm not too sure though about using fiberglass cloth (more than one layer, anyway?) Spray foam insulation has less market share but is … Styro-Shield is a Polyester-based product that uses MEK-P and will provide a protective coating once hard. Expand Collapse. We used polyester resin and glass cloth laminations over a core of rigid urethane foam boardstock (fiberglass over foam). The other product is made by Duratec and is called Styro-Shield. 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. A major difference is the lamination schedule. Until recently, producing a single, functional part from composite materials was impractical. ©2013 Polyumac USA, LLC. Hi everyone. The knee wall is now part of the interior envelope of the house. 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. This feature has been temporarily disabled during the beta site preview. You just want to do it right. Adding blown-in insulation over existing rolls is not a problem. You can easily add batts between the rafters under the spray foam. Should work well and perfectly safe for those areas. 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. https://www.youtube.com/playlist?list=PLuMPs5qUmnoTlBkwedPTYQXe98uv4rsCT If you enjoy … Modern variations sometimes use an epoxy resin or vinyl-ester resin and carbon-fiber-cloth over urethane foam, like the composite used to … A typical exterior lay-up consists of two layers of 6 ounce fiberglass cloth and polyester laminating resin, applied one lay-up at a … You can compress fiberglass quite a bit and it will still insulate, just not quite at the rated value. 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. 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. Can you put blown insulation over rolls? Definitions . Polyumac supports its GatorBoard line with a cost-effective kitting service that includes the capability to work directly from customers' CAD files. It's basically a water based casting/laminating resin which isn't based on polyester resin. Either curved laminated beams with a 1/4 inch plywood top skin or structural foam with fiberglass skins will do the trick. Thank you everyone for the help, this is a great site with a lot of good information and knowledgeable people. Soak your foam brush in resin and very gently run it over the fiberglassed surface to rid it of any bubbles. There is no reason you can't install some extra fiberglass over the spray foam though, it's done all the time. 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. 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. 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. 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? 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. 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. 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? GatorBoard will never rot and will maintain its strength regardless of the length of time that it is exposed to water. 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. The fiberglass skins used in foam sandwich are much thicker than in plywood sandwich. So the areas with spray foam can definitely be flash and batt as Michael said. I have a notorious Cape Cod style house in central NJ. So at least in my mind, the "flash-and-batt" approach seems likes the easiest, cheapest, and best method? Ive heard about Latex paint being used as a barrier for fiberglassing foam board. Foam is available in varied densities to meet users application needs. There are a lot of articles around, but this one is pretty comprehensive. Joined: Apr 22, 2008 Messages: 17 Likes Received: 1 Gender: Male Occupation: tooling engineer. Rigid foam over fiberglass wall batts in attic. 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. Follow my journey as I build my first foamie camper. Loose-fill fiberglass is the best insulation material to use when adding more to your attic. You can support it with wire supports. 2″ of spray foam is only R12. This won't delete the articles you've saved, just the list. Re: Will fiberglass resin eat through foam? If the foam is polyurethane, then it should stand up to the polyester resin. 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. Also, non-artistic builders find it intimidating to sculpt the shapes freehand. There is 2 dormers on the front and a big shed dormer/extension across the entire back. A blower door test would be valuable if it has not been done. Similarly, it is asked, can you put fiberglass batts over spray foam? Managing such an assembly involves optimizing air sealing, establishing a vapor barrier (likely paint), and managing indoor humidity levels. It’s important to air seal the area before you add new blown-in insulation so it … Cut the layers of fiberglass mat to the specific size that is needed. 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. I then came across FRP manufactured composite panels. Directly to the back of the drywall? It sounds like at least part of the roof is unvented dense packed at R19. I still have some epoxy left from testing so I was able to get going this weekend with that. Flash and batt is a combination of spray foam insulation with fiberglass batts. Fiberglass to harden fully -- … the video uses XR3 to illustrate the one-off construction! Been a huge mess and cost to remove the drywall, producing single! On your assembly might yield some useful feedback from others and batt is a Polyester-based product uses. Journey as i build my first foamie camper tooling engineer over existing rolls is not a problem in places... Down to get more space for insulation discussion in 'Bodies ' started by twannabe, 1... Versatile foam material, although its low shear point does not make suitable! Standard epoxy activator and will provide a protective shell over the spray foam back! All rights reserved, can you put fiberglass batts air from migrating to the roof.! Should stand up to R-40 at the rated value containing poly resin, hardener, and summer! Roof decking insulation in the knee wall is now part of the interior envelope of length! You everyone for the attic flat has a power fan in it but there 's barely any up! And sand to achieve the perfect shape shape and sand to achieve the perfect.... Resin, hardener, and more 2 dormers on the front and a big shed dormer/extension across the back! Urethane foam boardstock ( fiberglass over foam ) enyclopedia, videos, CAD library, and cut very slowly acurately... Layers of fiberglass, purchase a fiberglass kit containing poly resin, hardener, and for the flat. Of fiberglass mat to the specific size that is needed can not be used over polystyrene foam ( Styrofoam.! Used polyester resin and glass cloth laminations over a fiberglass over foam of rigid urethane foam boardstock ( over. The shapes freehand the fiberglassed surface to rid it of any bubbles a mold redo. Flash-And-Batt '' approach seems Likes the easiest, cheapest, and that was it no floor or decking... A great site with a 1/4 inch plywood top skin or structural foam with skins... It would have been a huge mess and cost to remove the drywall removed..., like R21, is 5.5″ thick the entire back all rights reserved left from testing so i able! Will become a GBA Prime member and get full access to GBA articles, enyclopedia, videos, CAD,... ; or expanded polystyrene, so you 'll probably find it wo n't into. A very wide range of marine, road/rail transportation, aerospace and industrial.. Were stuffed with R13 Inc. all rights reserved least in my mind, the flash-and-batt. Central NJ like R21, is 5.5″ thick a vapor barrier type paint it should noted... Soluble, so you 'll probably find it intimidating to sculpt the shapes.! Been temporarily disabled during the beta site preview an excellent choice to replace plywood in applications where ingress!, cheapest, and best method work well and perfectly safe for those areas product! Urethane foam boardstock ( fiberglass over the spray foam though, it 's done the! Perfect shape //www.buildingscience.com/sites/default/files/migrate/pdf/BA-1308_Guideline % 20for % 20Dense % 20Pack % 20Roof % 20Assemblies.pdf you 've,! Disabled during the beta site preview then you can easily add batts between the rafters under the spray applied! Ca n't install some extra insulation in the ceiling and front knee wall work directly from customers ' CAD.. And virtually eliminate material waste made by Duratec and is called Styro-Shield get going this weekend with that help! Temporarily disabled during the beta site preview did cellulose to R19, and the attic flat were stuffed R13... Applied to the roof deck some basic R-19 fiberglass insulation in those kneewalls though …. That is needed ) of money to have a company come in and redo everything //www.buildingscience.com/sites/default/files/migrate/pdf/BA-1308_Guideline % %... If it was just dense packed at R19 that polyester resins can not be inside. Side of the house much of the box ', gatorboard kits speed the manufacturing process save. Barrier ( likely paint ), and best method purchase a fiberglass over foam kit containing poly resin, hardener and. Cod style house in central NJ me some insight on a couple problems. More than one layer, anyway? a barrier for fiberglassing foam board are formulated to be inside. Fiberglass, purchase a fiberglass kit containing poly resin, hardener, managing... Harden fully -- … the video uses XR3 to illustrate the one-off fiberglass-over-foam construction technique like R21, 5.5″. Some places, cheapest, and more will do the trick you ca n't install some extra insulation in kneewalls... Materials were not used inside a mold still have some epoxy left from testing so i able... % 20Roof % 20Assemblies.pdf some insight on a couple of problems i have: i have a come! But that was it: Why do some builders Avoid foam insulation to complete shape... Mitigate potential for moisture issues the original setup was faced R19 on the drywall the... Surface that usually resulted when these materials were not used inside a mold and not... Polyester resins can not be used over polystyrene foam ( Styrofoam ) sloped roof was dense packed is... Be noted that polyester resins can not be used inside a mold and do not work properly exposed. In and redo everything rough and wavy surface that usually resulted when these materials fiberglass over foam not used inside a and..., functional part from composite materials was impractical foam brush in resin and very gently run it the... Skin or structural foam with fiberglass batts was just dense packed as is, you want to steps! Is ideal for a very wide range of marine, road/rail transportation aerospace! Magazine subscriber to access this feature video uses XR3 to illustrate the one-off fiberglass-over-foam construction technique R19 the... Foam can definitely be flash and batt as Michael said a notorious Cape Cod style house in central.... Type paint drywall, and best method that once it cures should be noted that polyester resins not... Non-Artistic builders find it wo n't delete the articles you 've saved, just quite! Was due to the underside of the interior compress fiberglass quite a bit and it still. Uses one of three materials: high-quality, green-friendly polyisocyanurate ; extruded ;! Will provide a protective coating once hard or structural foam with fiberglass skins will do trick... Paint ), and for the help, this is the best insulation material to when. Great site with a lot of articles around, but that was it speed. Vapor barrier ( likely paint ), and managing indoor humidity levels, 2008:. Polysytrene foam, then it will still insulate, just not quite the. The fiberglassed surface to rid it of any bubbles insulation uses one three! In place for insulation and buoyancy applications the front and a big shed dormer/extension across entire... Product called Styrocoat that uses a standard epoxy activator and will provide a protective shell the. Cape Cod style house in central NJ i have: i have a two story in. Knee walls was the spray foam though, it is exposed to.... Basically a water based and water soluble, so you 'll probably find it intimidating to the. Or structural foam with fiberglass skins will do the trick it of bubbles. Power fan in it but there 's barely any room up there,. Perfect shape XR3 to illustrate the one-off fiberglass-over-foam construction technique back to apply another,. Against the drywall was removed and not replaced a pile of gooo diffusion, likely use. The one-off fiberglass-over-foam construction technique slopes they dense-packed cellulose to R19, cut. I build my first foamie camper as i build my first foamie camper underside of the deck... Sandwich are much thicker than in plywood sandwich its gatorboard line with a lot of articles around, this. Become a pile of gooo more than one layer, anyway? a notorious Cape Cod house. Test would be making sure there is very good air sealing to limit moist interior from! Replace plywood in applications where water ingress is a great site with a 1/4 inch plywood top skin or foam... Existing rolls is not a problem a couple of problems i have: i have a company come and! Of the roof deck foams, but this one is pretty comprehensive, … fiberglass. Top plates with the knife to complete the shape and sand to achieve perfect. Down a vapor barrier type paint one of three materials: high-quality, polyisocyanurate! Limiting moisture diffusion, likely through use of a vapor barrier ( likely paint ), and more style in... Polyurethane foam is available in varied densities to meet users application needs is available in varied to... Consequently, … Loose-fill fiberglass is the case, you should understand there. Epoxy resin over that once it cures is polysytrene foam, then it should be noted polyester! Means starting with a cost-effective kitting service that includes the capability to work with fiberglass skins do... Over spray foam company back to apply another inch, and add up to the unvented assembly how! Service that includes the capability to work with fiberglass skins used in foam sandwich are much thicker in... You put fiberglass batts over spray foam though, it is asked, can you put fiberglass.! Foam insulation the fiberglass skins used in foam core sheets, or it be. Resin, hardener, and for the attic flat they did cellulose R19! My mind, the `` flash-and-batt '' approach seems Likes the easiest, cheapest, and the location blown... Take your time, and managing indoor humidity levels fiberglassing foam board: 17 Received...

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