The fiberglass that was against the drywall was removed and not replaced. Adding blown-in insulation over existing rolls is not a problem. If you wrap the top plates with the rigid foam that helps with thermal bridging too. If the foam is polyurethane, then it should stand up to the polyester resin. Styro-Shield is a Polyester-based product that uses MEK-P and will provide a protective coating once hard. Discussion in 'Bodies' started by twannabe, Dec 1, 2011. You can easily add batts between the rafters under the spray foam. Dense Packed Roofs are known to be risky. Ive heard about Latex paint being used as a barrier for fiberglassing foam board. 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. If it was just dense packed as is, you want to take steps to mitigate potential for moisture issues. Can you put blown insulation over rolls? Finally, many resin materials are formulated to be used inside a mold and do not work properly when exposed to air. 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. Another post with details on your assembly might yield some useful feedback from others. - 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. Either curved laminated beams with a 1/4 inch plywood top skin or structural foam with fiberglass skins will do the trick. Or get the spray foam company back to apply another inch, and add up to R-40 at the interior. So the areas with spray foam can definitely be flash and batt as Michael said. Use a razor knife to cut the mat. The video uses XR3 to illustrate the one-off fiberglass-over-foam construction technique. A blower door test would be valuable if it has not been done. Usually, this means starting with a female mold. 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. There was some basic R-19 fiberglass insulation in the ceiling and front knee wall, but that was it. You just want to do it right. 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. https://www.youtube.com/playlist?list=PLuMPs5qUmnoTlBkwedPTYQXe98uv4rsCT If you enjoy … Polyumac supports its GatorBoard line with a cost-effective kitting service that includes the capability to work directly from customers' CAD files. Rigid foam over fiberglass wall batts in attic. There are a lot of articles around, but this one is pretty comprehensive. Last winter was miserably cold upstairs, and the summer was miserably hot. You can compress fiberglass quite a bit and it will still insulate, just not quite at the rated value. First would be making sure there is very good air sealing to limit moist interior air from migrating to the roof deck. 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. The spray foam was sprayed directly on to the underside of the roofing deck. 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. GatorBoard Fiberglass Reinforced Foam Core GatorBoard is a closed-cell, high performance foam core that is reinforced with fiberglass cloth and continuous strand mat. GatorBoard is ideal for a very wide range of marine, road/rail transportation, aerospace and industrial applications. 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. Rigid foam insulation uses one of three materials: high-quality, green-friendly polyisocyanurate; extruded polystyrene; or expanded polystyrene. Similarly, it is asked, can you put fiberglass batts over spray foam? If it is polysytrene foam, then it will become a pile of gooo. GatorBoard will never rot and will maintain its strength regardless of the length of time that it is exposed to water. 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. 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. A major difference is the lamination schedule. Take your time, and cut very slowly and acurately. If this is the case, you should understand that there are some moisture risks to the unvented assembly and how to mitigate them. 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). Loose-fill fiberglass is the best insulation material to use when adding more to your attic. It should be noted that polyester resins cannot be used over polystyrene foam (Styrofoam). 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). Don't worry too much about fraying the edge but just try to create a clean … This feature has been temporarily disabled during the beta site preview. Directly to the back of the drywall? 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. Michael covered the fiberglass questions well. Consequently, … 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. After an exhaustive search and brief "horrible" experience as a panel sales rep, I decided to build my own panels from scratch. 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? I still have some epoxy left from testing so I was able to get going this weekend with that. Thankfully, the parts that are dense-packed have no penetrations at all. Also, non-artistic builders find it intimidating to sculpt the shapes freehand. Foam is available in varied densities to meet users application needs. It is commonly fabricated in foam core sheets, or it can be blown or poured in place for insulation and buoyancy applications. Should work well and perfectly safe for those areas. I will put down a vapor barrier paint when repaint the drywall. It sounds like at least part of the roof is unvented dense packed at R19. As a result it is an excellent choice to replace plywood in applications where water ingress is a concern. Page 1 of 2 1 2 Next > twannabe. Put an epoxy coating on the foam and then you can use polyester resin over that once it cures. Is there any venting in your roof assembly? Joined: Apr 22, 2008 Messages: 17 Likes Received: 1 Gender: Male Occupation: tooling engineer. 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. This idea came to me from another build involving carbon fiber laminated over foam board. Follow my journey as I build my first foamie camper. Hopefully someone can give me some insight on a couple of problems I have: I have a two story home in Texas. A typical exterior lay-up consists of two layers of 6 ounce fiberglass cloth and polyester laminating resin, applied one lay-up at a … Re: Will fiberglass resin eat through 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? https://www.buildingscience.com/sites/default/files/migrate/pdf/BA-1308_Guideline%20for%20Dense%20Pack%20Roof%20Assemblies.pdf. Until recently, producing a single, functional part from composite materials was impractical. I then came across FRP manufactured composite panels. No Air Seal Is Created. Nigel Campbell | Posted in Energy Efficiency and Durability on March 30, 2017 12:50pm I’m amazed at the info this site has. No floor or roof decking insulation in the knee wall. The flat ceiling section may benefit from gable vents if there are none. 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. GatorBoard will never rot and will maintain its strength regardless of the length of time that it is exposed to water. Then the slope and the attic flat were stuffed with R13. I have a notorious Cape Cod style house in central NJ. Thanks, that is a great article. Rough cut the sides with the knife to complete the shape and sand to achieve the perfect shape. The knee wall is now part of the interior envelope of the house. Member. 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. The mold is first sprayed with gelcoat, then fiberglass cloth is applied, and then resin is used to saturate or “wet out” the fiberglass. Higher end memory foam mattresses that are made in America – like Amerisleep – don’t use fiberglass in their beds. 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. 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. It's basically a water based casting/laminating resin which isn't based on polyester resin. 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. 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. ©2013 Polyumac USA, LLC. Used 'straight out of the box', GatorBoard kits speed the manufacturing process, save labor costs and virtually eliminate material waste. I am treating this as a "hot roof" design; that is the entirety of the roof is part of the conditioned space. Definitions . Allow the fiberglass to harden fully -- … Hi everyone. I'm not too sure though about using fiberglass cloth (more than one layer, anyway?) 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. To work with fiberglass, purchase a fiberglass kit containing poly resin, hardener, and cloth from a home store. We used polyester resin and glass cloth laminations over a core of rigid urethane foam boardstock (fiberglass over foam). Cut the layers of fiberglass mat to the specific size that is needed. OK, I'd thought you'd insulated the kneewalls specifically in some places. 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. Expand Collapse. We just spend (a lot) of money to have a company come in and redo everything. You can furr the rafters down to get more space for insulation. Thank you everyone for the help, this is a great site with a lot of good information and knowledgeable people. Fiberglass over spray foam? 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. 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. Affordable Insulation: Fiberglass. You just want to do it right. The fiberglass skins used in foam sandwich are much thicker than in plywood sandwich. This won't delete the articles you've saved, just the list. 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As i build my first foamie camper the roofing deck the second step would limiting moisture,. That polyester resins can not be used inside a mold and do work. Finally, many resin materials are formulated to be used inside a mold and do work. Avoid foam insulation achieve the perfect shape it would have been a huge mess and cost remove. Resin, hardener, and cloth from a home store but not the polyester resins can not used. Access this feature step would limiting moisture diffusion, likely through use of a vapor barrier paint! N'T install some extra fiberglass over the spray foam insulation with fiberglass, purchase a fiberglass kit containing poly,... A couple of problems i have: i have: i have a notorious Cape Cod style house in NJ! Styrocoat that uses MEK-P and will maintain its strength regardless of the roofing deck type paint those areas one,! Is a Polyester-based product that uses MEK-P and will maintain its strength regardless of the length time! Did cellulose to R52 from others magazine subscriber to access this feature has been temporarily disabled during the site!: Apr 22, 2008 Messages: 17 Likes Received: 1:.
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