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. Styro-Shield is a Polyester-based product that uses MEK-P and will provide a protective coating once hard. 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. https://www.buildingscience.com/sites/default/files/migrate/pdf/BA-1308_Guideline%20for%20Dense%20Pack%20Roof%20Assemblies.pdf. Rigid foam insulation uses one of three materials: high-quality, green-friendly polyisocyanurate; extruded polystyrene; or expanded polystyrene. So at least in my mind, the "flash-and-batt" approach seems likes the easiest, cheapest, and best method? Should work well and perfectly safe for those areas. 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. Is there any venting in your roof assembly? 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. 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 video uses XR3 to illustrate the one-off fiberglass-over-foam construction technique. Hi everyone. Polyurethane foam is another versatile foam material, although its low shear point does not make it suitable for structural use. GatorBoard is a closed-cell, high performance foam core that is reinforced with fiberglass cloth and continuous strand mat. Much of the problem was due to the rough and wavy surface that usually resulted when these materials were not used inside a mold. The second step would limiting moisture diffusion, likely through use of a vapor barrier type paint. GatorBoard is ideal for a very wide range of marine, road/rail transportation, aerospace and industrial applications. If it is polysytrene foam, then it will become a pile of gooo. This feature has been temporarily disabled during the beta site preview. 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. You must be a magazine subscriber to access this feature. The spray foam was sprayed directly on to the underside of the roofing deck. Consequently, … © 2021 The Taunton Press, Inc. All rights reserved. It's water based and water soluble, so you'll probably find it won't eat into the foam. No, there is no venting. As a result it is an excellent choice to replace plywood in applications where water ingress is a concern. Cut the layers of fiberglass mat to the specific size that is needed. Take your time, and cut very slowly and acurately. Joined: Apr 22, 2008 Messages: 17 Likes Received: 1 Gender: Male Occupation: tooling engineer. The fiberglass skins used in foam sandwich are much thicker than in plywood sandwich. 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. Dense Packed Roofs are known to be risky. 2″ of spray foam is only R12. 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. Either curved laminated beams with a 1/4 inch plywood top skin or structural foam with fiberglass skins will do the trick. With fiberglass boat building, however, the major components of the boat – the hull, deck, liner, and large parts like consoles—are molded from fiberglass. 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. Can you put blown insulation over rolls? 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). Affordable Insulation: Fiberglass. I will put down a vapor barrier paint when repaint the drywall. There is 2 dormers on the front and a big shed dormer/extension across the entire back. Follow my journey as I build my first foamie camper. The other product is made by Duratec and is called Styro-Shield. There are a lot of articles around, but this one is pretty comprehensive. https://www.youtube.com/playlist?list=PLuMPs5qUmnoTlBkwedPTYQXe98uv4rsCT If you enjoy … The flat ceiling section may benefit from gable vents if there are none. The attic flat has a power fan in it but there's barely any room up there. If this is the case, you should understand that there are some moisture risks to the unvented assembly and how to mitigate them. 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. The mold is first sprayed with gelcoat, then fiberglass cloth is applied, and then resin is used to saturate or “wet out” the fiberglass. Until recently, producing a single, functional part from composite materials was impractical. 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. The knee wall is now part of the interior envelope of the house. You just want to do it right. Definitions . 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. 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. Thank you everyone for the help, this is a great site with a lot of good information and knowledgeable people. Your contractor may suggest just an inch of closed cell spray foam coupled … 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? Similarly, it is asked, can you put fiberglass batts over spray foam? FAQ: Why Do Some Builders Avoid Foam Insulation. Soak your foam brush in resin and very gently run it over the fiberglassed surface to rid it of any bubbles. I then came across FRP manufactured composite panels. A blower door test would be valuable if it has not been done. Fiberglass over spray foam? https://www.buildingscience.com/sites/default/files/migrate/pdf/BA-1308_Guideline%20for%20Dense%20Pack%20Roof%20Assemblies.pdf. Thankfully, the parts that are dense-packed have no penetrations at all. A typical exterior lay-up consists of two layers of 6 ounce fiberglass cloth and polyester laminating resin, applied one lay-up at a … Either soffit, ridge, or gable? I have a notorious Cape Cod style house in central NJ. After an exhaustive search and brief "horrible" experience as a panel sales rep, I decided to build my own panels from scratch. Rigid foam over fiberglass wall batts in attic. 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