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