fiberglass over foam
There is 2 dormers on the front and a big shed dormer/extension across the entire back. 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. You can easily add batts between the rafters under the spray foam. 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. There is no reason you can't install some extra fiberglass over the spray foam though, it's done all the time. 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. 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. Fiberglass installation labor cost is about $1.00 to $2.75 per square foot based on the amount of insulation and the location. A typical exterior lay-up consists of two layers of 6 ounce fiberglass cloth and polyester laminating resin, applied one lay-up at a … Use a razor knife to cut the mat. Either soffit, ridge, or gable? 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. Styro-Shield is a Polyester-based product that uses MEK-P and will provide a protective coating once hard. No floor or roof decking insulation in the knee wall. Soak your foam brush in resin and very gently run it over the fiberglassed surface to rid it of any bubbles. 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. 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. Rough cut the sides with the knife to complete the shape and sand to achieve the perfect shape. Thank you everyone for the help, this is a great site with a lot of good information and knowledgeable people. https://www.buildingscience.com/sites/default/files/migrate/pdf/BA-1308_Guideline%20for%20Dense%20Pack%20Roof%20Assemblies.pdf. It is commonly fabricated in foam core sheets, or it can be blown or poured in place for insulation and buoyancy applications. Affordable Insulation: Fiberglass. Or get the spray foam company back to apply another inch, and add up to R-40 at the interior. There are a lot of articles around, but this one is pretty comprehensive. 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. FAQ: Why Do Some Builders Avoid Foam Insulation. 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). 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. Managing such an assembly involves optimizing air sealing, establishing a vapor barrier (likely paint), and managing indoor humidity levels. Expand Collapse. 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. Discussion in 'Bodies' started by twannabe, Dec 1, 2011. First step was to locate the fiberglass skin. - 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. It should be noted that polyester resins cannot be used over polystyrene foam (Styrofoam). Directly to the back of the drywall? Dense Packed Roofs are known to be risky. https://www.buildingscience.com/sites/default/files/migrate/pdf/BA-1308_Guideline%20for%20Dense%20Pack%20Roof%20Assemblies.pdf. Fiberglass over spray foam? https://www.youtube.com/playlist?list=PLuMPs5qUmnoTlBkwedPTYQXe98uv4rsCT If you enjoy … Become a GBA Prime member and get full access to GBA articles, enyclopedia, videos, CAD library, and more. Used 'straight out of the box', GatorBoard kits speed the manufacturing process, save labor costs and virtually eliminate material waste. You just want to do it right. Should work well and perfectly safe for those areas. Definitions . Finally, many resin materials are formulated to be used inside a mold and do not work properly when exposed to air. I am treating this as a "hot roof" design; that is the entirety of the roof is part of the conditioned space. You can support it with wire supports. Hi everyone. Also, non-artistic builders find it intimidating to sculpt the shapes freehand. 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. The first product is an FGCI product called Styrocoat that uses a standard epoxy activator and will provide a protective shell over the Styrofoam. Follow my journey as I build my first foamie camper. You just want to do it right. Either curved laminated beams with a 1/4 inch plywood top skin or structural foam with fiberglass skins will do the trick. I will put down a vapor barrier paint when repaint the drywall. 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—-. 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. For the slopes they dense-packed cellulose to R19, and for the attic flat they did cellulose to R52. 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. Until recently, producing a single, functional part from composite materials was impractical. So at least in my mind, the "flash-and-batt" approach seems likes the easiest, cheapest, and best method? 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. GatorBoard will never rot and will maintain its strength regardless of the length of time that it is exposed to water. Don't worry too much about fraying the edge but just try to create a clean … I have a notorious Cape Cod style house in central NJ. 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. Flash and batt is a combination of spray foam insulation with fiberglass batts. Usually, this means starting with a female mold. 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. 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 Page 1 of 2 1 2 Next > twannabe. Foam is available in varied densities to meet users application needs. Then the slope and the attic flat were stuffed with R13. A blower door test would be valuable if it has not been done. No, there is no venting. 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. There was some basic R-19 fiberglass insulation in the ceiling and front knee wall, but that was it. The original setup was faced R19 on the drywall, and that was it. After an exhaustive search and brief "horrible" experience as a panel sales rep, I decided to build my own panels from scratch. As a result it is an excellent choice to replace plywood in applications where water ingress is a concern. Polyumac supports its GatorBoard line with a cost-effective kitting service that includes the capability to work directly from customers' CAD files. Is there any venting in your roof assembly? Rigid foam insulation uses one of three materials: high-quality, green-friendly polyisocyanurate; extruded polystyrene; or expanded polystyrene. You must be a magazine subscriber to access this feature. 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. If it was just dense packed as is, you want to take steps to mitigate potential for moisture issues. Thankfully, the parts that are dense-packed have no penetrations at all. Loose-fill fiberglass is the best insulation material to use when adding more to your attic. If this is the case, you should understand that there are some moisture risks to the unvented assembly and how to mitigate them. It’s important to air seal the area before you add new blown-in insulation so it … The flat ceiling section may benefit from gable vents if there are none. Much of the problem was due to the rough and wavy surface that usually resulted when these materials were not used inside a mold. I still have some epoxy left from testing so I was able to get going this weekend with that. 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.
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