Polyumac supports its GatorBoard line with a cost-effective kitting service that includes the capability to work directly from customers' CAD files. The fiberglass that was against the drywall was removed and not replaced. ©2013 Polyumac USA, LLC. First step was to locate the fiberglass skin. The first product is an FGCI product called Styrocoat that uses a standard epoxy activator and will provide a protective shell over the Styrofoam. 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. GatorBoard is a closed-cell, high performance foam core that is reinforced with fiberglass cloth and continuous strand mat. I still have some epoxy left from testing so I was able to get going this weekend with that. 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 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). Expand Collapse. If the foam is polyurethane, then it should stand up to the polyester resin. If it is polysytrene foam, then it will become a pile of gooo. Rigid foam insulation uses one of three materials: high-quality, green-friendly polyisocyanurate; extruded polystyrene; or expanded polystyrene. Become a GBA Prime member and get full access to GBA articles, enyclopedia, videos, CAD library, and more. There is no reason you can't install some extra fiberglass over the spray foam though, it's done all the time. The knee wall is now part of the interior envelope of the house. I have a notorious Cape Cod style house in central NJ. You must be a magazine subscriber to access this feature. 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. A typical exterior lay-up consists of two layers of 6 ounce fiberglass cloth and polyester laminating resin, applied one lay-up at a … https://www.buildingscience.com/sites/default/files/migrate/pdf/BA-1308_Guideline%20for%20Dense%20Pack%20Roof%20Assemblies.pdf. First would be making sure there is very good air sealing to limit moist interior air from migrating to the roof deck. Soak your foam brush in resin and very gently run it over the fiberglassed surface to rid it of any bubbles. Follow my journey as I build my first foamie camper. The attic flat has a power fan in it but there's barely any room up there. Foam is available in varied densities to meet users application needs. I will put down a vapor barrier paint when repaint the drywall. Allow the fiberglass to harden fully -- … https://www.youtube.com/playlist?list=PLuMPs5qUmnoTlBkwedPTYQXe98uv4rsCT If you enjoy … Re: Will fiberglass resin eat through foam? Loose-fill fiberglass is the best insulation material to use when adding more to your attic. Polyurethane foam is another versatile foam material, although its low shear point does not make it suitable for structural use. 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. Thank you everyone for the help, this is a great site with a lot of good information and knowledgeable people. If it was just dense packed as is, you want to take steps to mitigate potential for moisture issues. No floor or roof decking insulation in the knee wall. 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 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. Should work well and perfectly safe for those areas. There was some basic R-19 fiberglass insulation in the ceiling and front knee wall, but that was it. This feature has been temporarily disabled during the beta site preview. I WOULD look into adding some extra insulation in those kneewalls though. Fiberglass installation labor cost is about $1.00 to $2.75 per square foot based on the amount of insulation and the location. Can you put blown insulation over rolls? A major difference is the lamination schedule. 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. We just spend (a lot) of money to have a company come in and redo everything. 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. Directly to the back of the drywall? So the areas with spray foam can definitely be flash and batt as Michael said. For the slopes they dense-packed cellulose to R19, and for the attic flat they did cellulose to R52. The sloped roof was dense packed as is; it would have been a huge mess and cost to remove the drywall. A blower door test would be valuable if it has not been done. There are a lot of articles around, but this one is pretty comprehensive. 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. 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. The only problem is any substantial amount of fiberglass, like R21, is 5.5″ thick. The other product is made by Duratec and is called Styro-Shield. Also, non-artistic builders find it intimidating to sculpt the shapes freehand. 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 original setup was faced R19 on the drywall, and that was it. Spray foam insulation has less market share but is … 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. 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. 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. Adding blown-in insulation over existing rolls is not a problem. This won't delete the articles you've saved, just the list. Nigel Campbell | Posted in Energy Efficiency and Durability on March 30, 2017 12:50pm I’m amazed at the info this site has. Consequently, … Then the slope and the attic flat were stuffed with R13. Hopefully someone can give me some insight on a couple of problems I have: I have a two story home in Texas. I'm not too sure though about using fiberglass cloth (more than one layer, anyway?) https://www.buildingscience.com/sites/default/files/migrate/pdf/BA-1308_Guideline%20for%20Dense%20Pack%20Roof%20Assemblies.pdf. The fiberglass skins used in foam sandwich are much thicker than in plywood sandwich. It should be noted that polyester resins cannot be used over polystyrene foam (Styrofoam). 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. Cut the layers of fiberglass mat to the specific size that is needed. 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. It is commonly fabricated in foam core sheets, or it can be blown or poured in place for insulation and buoyancy applications. Either soffit, ridge, or gable? After an exhaustive search and brief "horrible" experience as a panel sales rep, I decided to build my own panels from scratch. It sounds like at least part of the roof is unvented dense packed at R19. So at least in my mind, the "flash-and-batt" approach seems likes the easiest, cheapest, and best method? GatorBoard is ideal for a very wide range of marine, road/rail transportation, aerospace and industrial applications. Fiberglass over spray foam? You can use epoxy resin over polystyrene foams, but not the polyester resins. Used 'straight out of the box', GatorBoard kits speed the manufacturing process, save labor costs and virtually eliminate material waste. 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. With fiberglass boat building, however, the major components of the boat – the hull, deck, liner, and large parts like consoles—are molded from fiberglass. Another post with details on your assembly might yield some useful feedback from others. Fiberglass insulation and spray foam around windows. Rough cut the sides with the knife to complete the shape and sand to achieve the perfect shape. No, there is no venting. - 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. Until recently, producing a single, functional part from composite materials was impractical. FAQ: Why Do Some Builders Avoid Foam Insulation. 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. 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. Thankfully, the parts that are dense-packed have no penetrations at all. GatorBoard will never rot and will maintain its strength regardless of the length of time that it is exposed to water. 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? Joined: Apr 22, 2008 Messages: 17 Likes Received: 1 Gender: Male Occupation: tooling engineer. 2″ of spray foam is only R12. It’s important to air seal the area before you add new blown-in insulation so it … 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? This idea came to me from another build involving carbon fiber laminated over foam board. 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