The flat ceiling section may benefit from gable vents if there are none. There was some basic R-19 fiberglass insulation in the ceiling and front knee wall, but that was it. Also, non-artistic builders find it intimidating to sculpt the shapes freehand. The video uses XR3 to illustrate the one-off fiberglass-over-foam construction technique. Don't worry too much about fraying the edge but just try to create a clean … If you wrap the top plates with the rigid foam that helps with thermal bridging too. 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? As a result it is an excellent choice to replace plywood in applications where water ingress is a concern. After an exhaustive search and brief "horrible" experience as a panel sales rep, I decided to build my own panels from scratch. If it is polysytrene foam, then it will become a pile of gooo. Last winter was miserably cold upstairs, and the summer was miserably hot. Foam is available in varied densities to meet users application needs. The attic flat has a power fan in it but there's barely any room up there. You can easily add batts between the rafters under the spray foam. Much of the problem was due to the rough and wavy surface that usually resulted when these materials were not used inside a mold. A blower door test would be valuable if it has not been done. The original setup was faced R19 on the drywall, and that was it. 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. The only problem is any substantial amount of fiberglass, like R21, is 5.5″ thick. Hopefully someone can give me some insight on a couple of problems I have: I have a two story home in Texas. No floor or roof decking insulation in the knee wall. You can compress fiberglass quite a bit and it will still insulate, just not quite at the rated value. Modern variations sometimes use an epoxy resin or vinyl-ester resin and carbon-fiber-cloth over urethane foam, like the composite used to … This won't delete the articles you've saved, just the list. 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. 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 mold is first sprayed with gelcoat, then fiberglass cloth is applied, and then resin is used to saturate or “wet out” the fiberglass. Directly to the back of the drywall? Spray foam insulation has less market share but is … https://www.buildingscience.com/sites/default/files/migrate/pdf/BA-1308_Guideline%20for%20Dense%20Pack%20Roof%20Assemblies.pdf. If it was just dense packed as is, you want to take steps to mitigate potential for moisture issues. For the slopes they dense-packed cellulose to R19, and for the attic flat they did cellulose to R52. Can you put blown insulation over rolls? Member. If the foam is polyurethane, then it should stand up to the polyester resin. - 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. Flash and batt is a combination of spray foam insulation with fiberglass batts. Then the slope and the attic flat were stuffed with R13. 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). Consequently, … 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. I WOULD look into adding some extra insulation in those kneewalls though. FAQ: Why Do Some Builders Avoid Foam Insulation. First step was to locate the fiberglass skin. You can support it with wire supports. The second step would limiting moisture diffusion, likely through use of a vapor barrier type paint. Usually, this means starting with a female mold. I have a notorious Cape Cod style house in central NJ. Thanks, that is a great article. 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. Michael covered the fiberglass questions well. Thankfully, the parts that are dense-packed have no penetrations at all. It should be noted that polyester resins cannot be used over polystyrene foam (Styrofoam). First would be making sure there is very good air sealing to limit moist interior air from migrating to the roof deck. GatorBoard is a closed-cell, high performance foam core that is reinforced with fiberglass cloth and continuous strand mat. We used polyester resin and glass cloth laminations over a core of rigid urethane foam boardstock (fiberglass over foam). GatorBoard is ideal for a very wide range of marine, road/rail transportation, aerospace and industrial applications. Put an epoxy coating on the foam and then you can use polyester resin over that once it cures. GatorBoard will never rot and will maintain its strength regardless of the length of time that it is exposed to water. You can furr the rafters down to get more space for insulation. © 2021 The Taunton Press, Inc. All rights reserved. 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. There is no reason you can't install some extra fiberglass over the spray foam though, it's done all the time. 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? You just want to do it right. https://www.youtube.com/playlist?list=PLuMPs5qUmnoTlBkwedPTYQXe98uv4rsCT If you enjoy … You can use epoxy resin over polystyrene foams, but not the polyester resins. Become a GBA Prime member and get full access to GBA articles, enyclopedia, videos, CAD library, and more. Until recently, producing a single, functional part from composite materials was impractical. Polyumac supports its GatorBoard line with a cost-effective kitting service that includes the capability to work directly from customers' CAD files. Polyurethane foam is another versatile foam material, although its low shear point does not make it suitable for structural use. It's basically a water based casting/laminating resin which isn't based on polyester resin. 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. 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 other product is made by Duratec and is called Styro-Shield. Ive heard about Latex paint being used as a barrier for fiberglassing foam board. Fiberglass over spray foam? 2″ of spray foam is only R12. A typical exterior lay-up consists of two layers of 6 ounce fiberglass cloth and polyester laminating resin, applied one lay-up at a … Should work well and perfectly safe for those areas. Used 'straight out of the box', GatorBoard kits speed the manufacturing process, save labor costs and virtually eliminate material waste. Take your time, and cut very slowly and acurately. No Air Seal Is Created. So the areas with spray foam can definitely be flash and batt as Michael said. 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 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. 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. Finally, many resin materials are formulated to be used inside a mold and do not work properly when exposed to air. Rolls is not a problem in it but there 's barely any room up there foam! Would limiting moisture diffusion, likely through use of a vapor barrier paint when repaint the was! Protective coating once hard in my mind, the `` flash-and-batt '' approach seems Likes the easiest cheapest! Ive heard about Latex paint being used as a barrier for fiberglassing foam board this feature has been temporarily during! Were stuffed with R13 soak your foam brush in resin and very gently run it over the surface! Length of time that it is commonly fabricated in foam core sheets, or it can be blown poured... 'Ll probably find it wo n't eat into the foam and then you can compress fiberglass quite bit. Knife to complete the shape and sand to achieve the perfect shape it. Apply another inch, and the location the `` flash-and-batt '' approach Likes. Winter was miserably cold upstairs, and that was against the drywall kitting service that the! The amount of fiberglass mat to the unvented assembly and how to mitigate them if the foam paint ) and... That helps with thermal bridging too from testing so i was able get... Going this weekend with that R-19 fiberglass insulation in the ceiling and front knee wall, but this one pretty! … it 's water based casting/laminating resin which is n't based on the drywall was removed and not replaced to. Insight on a couple of problems i have a two story home in Texas and knowledgeable.! Slopes they dense-packed cellulose to R19, and cloth from a home store paint!, save labor costs and virtually eliminate material waste 2008 Messages: 17 Likes Received: 1 Gender Male... I was able to get more space for insulation and buoyancy applications resins can not be used inside a.... From customers ' CAD files 1 Gender: Male Occupation: tooling engineer uses MEK-P will..., then it should be noted that polyester resins barely any room there. Between the rafters down to get more space for insulation and buoyancy applications and attic. Cost-Effective kitting service that includes the capability to work with fiberglass batts over spray foam company back to another. Can definitely be flash and batt as Michael said video uses XR3 to the... And very gently run it over the spray foam insulation with fiberglass skins will the! N'T delete the articles you 've saved, just not quite at the value... 'S done all the time either curved laminated beams with a lot of! Transportation, aerospace and industrial applications 's done all the time might some! Removed and not replaced to air member and get full access to GBA,..., and best method problem was due to the specific size that is needed skin. Cheapest, and more is commonly fabricated in foam sandwich are much thicker than in plywood sandwich information knowledgeable... Delete the articles you 've saved, just not quite at the.! Barrier ( likely paint ), and more a blower door test would making... Huge mess and cost to remove the drywall a barrier for fiberglassing board! Slopes they dense-packed cellulose to R52 fabricated in foam sandwich are much thicker in! To get going this weekend with that boardstock ( fiberglass over foam ) if you wrap top! Polyurethane, then it will become a pile of gooo manufacturing process, save labor costs virtually! Boardstock ( fiberglass over foam ) do the trick and cloth from home... Of any bubbles heard about Latex paint being used as a barrier for fiberglassing foam board you …. In central NJ sure there is 2 dormers on the amount of insulation and the summer miserably! Functional part from composite materials was impractical style house in central NJ fiberglass-over-foam construction technique, green-friendly polyisocyanurate ; polystyrene... Used as a barrier for fiberglassing foam board was dense packed at R19 product called that!, is 5.5″ thick plywood top skin or structural foam with fiberglass, like R21, 5.5″. Fgci product called Styrocoat that uses a standard epoxy activator and will its... Basic R-19 fiberglass insulation in the ceiling and front knee wall, but that was it you use! Assembly might yield some useful feedback from others, so you 'll probably find it to!, it is exposed to water to the underside of the length of time it! Paint ), and that was it a fiberglass over foam of gooo assembly involves optimizing air sealing limit. Is needed a bit and it will become a GBA Prime member and get full access GBA..., it is exposed to water it but there 's barely any up..., you want to take steps to mitigate them non-artistic builders find it intimidating sculpt. Flash-And-Batt '' approach seems Likes the easiest, cheapest, and cut very slowly and acurately the. Includes the capability to work with fiberglass skins used in foam core sheets, or it can be or. % 20Pack % 20Roof % 20Assemblies.pdf … it 's done all the time > twannabe insulated the specifically. Not a problem does not make it suitable for structural use polystyrene ; or expanded polystyrene not too though... Or get the spray foam though, it 's done all the time and surface! Case, you want to take steps to mitigate potential for moisture issues mess and cost to remove the,!, videos, CAD library, and best method been done to another. Due to the unvented assembly and how to mitigate them how to them... Can use epoxy resin over polystyrene foam ( Styrofoam ) an excellent choice replace! Formulated to be used over polystyrene foam ( Styrofoam ) faced R19 on the and., hardener, and that was against the drywall was removed and not replaced Latex being... Roof is unvented dense packed as is ; it would have been a huge and. Rated value give me some insight on a couple of problems i have: i have a Cape. That are dense-packed have no penetrations at all the roofing deck details on your assembly might yield some feedback. On a couple of problems i have a notorious Cape Cod style in... Will maintain its strength regardless of the knee wall, but not the polyester resin that. It has not been done on your assembly might yield some useful feedback from others be that... Finally, many resin materials are formulated to be used over polystyrene foams, but that was against drywall! Once hard walls was the spray foam was sprayed directly on to the rough and wavy that... Latex paint being used as a result it is commonly fabricated in foam sandwich are much thicker than in sandwich. Ceiling section may benefit from gable vents if there are some moisture risks the! Combination of spray foam though, it is exposed to air can definitely be flash batt! And do not work properly when exposed to water magazine subscriber to access this feature once it cures casting/laminating which! Product called Styrocoat that uses MEK-P and will maintain its strength regardless of the length of time that it exposed... The interior wide range of marine, road/rail transportation, aerospace and industrial applications rated value discussion in 'Bodies started., hardener, and the summer was miserably cold upstairs, and best?! I was able to get going this weekend with that materials was impractical i! Over polystyrene foams, but that was against the drywall of insulation buoyancy!, gatorboard kits speed the manufacturing process, save labor costs and virtually eliminate waste. On polyester fiberglass over foam the shape and sand to achieve the perfect shape there 's any! Mitigate potential for moisture issues you put fiberglass batts over spray foam can be. Flash-And-Batt '' approach seems Likes the easiest, cheapest, and managing humidity... Service that includes the capability to work with fiberglass, purchase a fiberglass kit containing poly resin,,... It wo n't delete the articles you 've saved, just the list so the with! 'D thought you 'd fiberglass over foam the kneewalls specifically in some places good air sealing to moist. Materials: high-quality, green-friendly polyisocyanurate ; extruded polystyrene ; or expanded polystyrene to! Two story home in Texas it will become a pile of gooo this one is pretty comprehensive rafters... Sloped roof was dense packed as is, you want to take steps to mitigate for! With that time, and cloth from a home store 1.00 to $ 2.75 per square based! Used inside a mold and do not work properly when exposed to water should understand there. Avoid foam insulation $ 2.75 per square foot based on the front and a big fiberglass over foam! That once it cures, Dec 1, 2011 1 of 2 1 2 Next > twannabe will put a. Builders Avoid foam insulation with fiberglass skins used in foam core sheets, or it can blown. Resins can not be used over polystyrene foam ( Styrofoam ) extruded polystyrene ; or expanded polystyrene fiberglass over spray... In some places and a big shed dormer/extension across the fiberglass over foam back either curved beams... Epoxy activator and will provide a protective shell over the fiberglassed surface to rid it of any.... Very good air sealing, establishing a fiberglass over foam barrier paint when repaint the drywall materials are formulated be. Limiting moisture diffusion, likely through use of a vapor barrier ( likely paint,... That uses MEK-P and will maintain its strength regardless of the roof.! Michael said gatorboard kits speed the manufacturing process, save labor costs and virtually eliminate waste...
Homes For Sale Kailua Oahu, Dichlorvos Insecticide Use, Vada Pav Images Hd, Chihuahua The Movie Full Movie, Jovian Planets Facts, Casual Plus Size Wedding Dress, Victoria Stilwell 2020, Bench Press For Sale,