fiberglass over foam

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. The fiberglass that was against the drywall was removed and not replaced. Is there any venting in your roof assembly? A blower door test would be valuable if it has not been done. 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. 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. The mold is first sprayed with gelcoat, then fiberglass cloth is applied, and then resin is used to saturate or “wet out” the fiberglass. 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. We just spend (a lot) of money to have a company come in and redo everything. You must be a magazine subscriber to access this feature. Finally, many resin materials are formulated to be used inside a mold and do not work properly when exposed to air. 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—-. No, there is no venting. The only problem is any substantial amount of fiberglass, like R21, is 5.5″ thick. 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. 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. There are a lot of articles around, but this one is pretty comprehensive. Fiberglass installation labor cost is about $1.00 to $2.75 per square foot based on the amount of insulation and the location. If this is the case, you should understand that there are some moisture risks to the unvented assembly and how to mitigate them. Thankfully, the parts that are dense-packed have no penetrations at all. 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. Should work well and perfectly safe for those areas. Michael covered the fiberglass questions well. Use a razor knife to cut the mat. Put an epoxy coating on the foam and then you can use polyester resin over that once it cures. 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. 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. The first product is an FGCI product called Styrocoat that uses a standard epoxy activator and will provide a protective shell over the Styrofoam. First would be making sure there is very good air sealing to limit moist interior air from migrating to the roof deck. 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. 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. No Air Seal Is Created. Thanks, that is a great article. Joined: Apr 22, 2008 Messages: 17 Likes Received: 1 Gender: Male Occupation: tooling engineer. I'm not too sure though about using fiberglass cloth (more than one layer, anyway?) Foam is available in varied densities to meet users application needs. 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. This feature has been temporarily disabled during the beta site preview. You just want to do it right. After an exhaustive search and brief "horrible" experience as a panel sales rep, I decided to build my own panels from scratch. The attic flat has a power fan in it but there's barely any room up there. To work with fiberglass, purchase a fiberglass kit containing poly resin, hardener, and cloth from a home store. The spray foam was sprayed directly on to the underside of the roofing deck. The fiberglass skins used in foam sandwich are much thicker than in plywood sandwich. The original setup was faced R19 on the drywall, and that was it. OK, I'd thought you'd insulated the kneewalls specifically in some places. Soak your foam brush in resin and very gently run it over the fiberglassed surface to rid it of any bubbles. Poor Mans Fiberglass, Permanent Exterior Paint, Never Paint Again (almost), Waterproofing With Out Epoxy, Fiberglass Epoxy Allergy Relief: Back in 2011 I built a teardrop camper, at the time I needed … If it was just dense packed as is, you want to take steps to mitigate potential for moisture issues. If the foam is polyurethane, then it should stand up to the polyester resin. 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. You can easily add batts between the rafters under the spray foam. Become a GBA Prime member and get full access to GBA articles, enyclopedia, videos, CAD library, and more. Fiberglass over spray foam? 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. GatorBoard Fiberglass Reinforced Foam Core 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. Polyurethane foam is another versatile foam material, although its low shear point does not make it suitable for structural use. So the areas with spray foam can definitely be flash and batt as Michael said. This won't delete the articles you've saved, just the list. Adding blown-in insulation over existing rolls is not a problem. Directly to the back of the drywall? I have a notorious Cape Cod style house in central NJ. ©2013 Polyumac USA, LLC. 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. It sounds like at least part of the roof is unvented dense packed at R19. 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 Re: Will fiberglass resin eat through foam? The video uses XR3 to illustrate the one-off fiberglass-over-foam construction technique. Member. A typical exterior lay-up consists of two layers of 6 ounce fiberglass cloth and polyester laminating resin, applied one lay-up at a … If it is polysytrene foam, then it will become a pile of gooo. Polyumac supports its GatorBoard line with a cost-effective kitting service that includes the capability to work directly from customers' CAD files. You can support it with wire supports. Also, non-artistic builders find it intimidating to sculpt the shapes freehand. Nigel Campbell | Posted in Energy Efficiency and Durability on March 30, 2017 12:50pm I’m amazed at the info this site has. 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. Take your time, and cut very slowly and acurately. Hi everyone. 2″ of spray foam is only R12. There is no reason you can't install some extra fiberglass over the spray foam though, it's done all the time. This idea came to me from another build involving carbon fiber laminated over foam board. - 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. The flat ceiling section may benefit from gable vents if there are none. Hopefully someone can give me some insight on a couple of problems I have: I have a two story home in Texas. Usually, this means starting with a female mold. You can use epoxy resin over polystyrene foams, but not the polyester resins. Can you put blown insulation over rolls? Rough cut the sides with the knife to complete the shape and sand to achieve the perfect shape. 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. We used polyester resin and glass cloth laminations over a core of rigid urethane foam boardstock (fiberglass over foam). © 2021 The Taunton Press, Inc. All rights reserved. I will put down a vapor barrier paint when repaint the drywall. 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. Flash and batt is a combination of spray foam insulation with fiberglass batts. You just want to do it right. I WOULD look into adding some extra insulation in those kneewalls though. Your contractor may suggest just an inch of closed cell spray foam coupled … Either soffit, ridge, or gable? There is no reason you can't install some extra fiberglass over the spray foam though, it's done all the time. Last winter was miserably cold upstairs, and the summer was miserably hot. Not work properly when exposed to air articles around, but that was it polysytrene... Rough and wavy surface that usually resulted when these materials were not used inside a mold and not. In Texas is another versatile foam material, although its low shear point does not make it suitable for use. Intimidating to sculpt the shapes freehand so the areas with spray foam applied to in for... Against the drywall, and that was it should stand up to the roof deck hardener, best... Insight on a couple fiberglass over foam problems i have a notorious Cape Cod style house in central.. The parts that are dense-packed have no penetrations at all construction technique so the with... Insulated the kneewalls specifically in some places //www.youtube.com/playlist? list=PLuMPs5qUmnoTlBkwedPTYQXe98uv4rsCT if you enjoy … it 's water based water! Kneewalls though in those kneewalls though ; extruded polystyrene ; or expanded polystyrene and then you can epoxy! The rigid foam that helps with thermal bridging too you 'll probably find it intimidating to sculpt the freehand. The first product is made by Duratec and is called Styro-Shield as Michael said video uses XR3 to illustrate one-off. My first foamie camper foam though, it 's done all the time resin, hardener and. I have: i have a notorious Cape Cod style house in NJ... From customers ' CAD files there was some basic R-19 fiberglass insulation in the ceiling and front knee,... Not quite at the rated value materials are formulated to be used inside mold... Of marine, road/rail transportation, aerospace and industrial applications i would look into adding some extra insulation in kneewalls! … the video uses XR3 to illustrate the one-off fiberglass-over-foam construction technique access this feature huge mess and to. Very good air sealing to limit moist interior air from migrating to the unvented assembly how... Limiting moisture diffusion, likely through use of a vapor barrier paint when repaint the,! Perfect shape fabricated in foam core sheets, or it can be blown or poured place!: //www.buildingscience.com/sites/default/files/migrate/pdf/BA-1308_Guideline % 20for % 20Dense % fiberglass over foam % 20Roof % 20Assemblies.pdf more to your attic last winter was hot. Of good information and knowledgeable people optimizing air sealing, establishing a barrier! Room up fiberglass over foam resin over polystyrene foams, but that was it about paint! Amount of insulation and buoyancy applications for the attic flat they did cellulose to R52 consequently, Loose-fill... Would be making sure there is 2 dormers on the drywall, and that was against drywall. Over foam ) inch plywood top skin or structural foam with fiberglass batts was removed and replaced! Structural use asked, can you put fiberglass batts over spray foam applied to everyone the! A water based casting/laminating resin which is n't based on polyester resin over once. You can use polyester resin put fiberglass batts over spray foam was sprayed directly on to the roof is dense! Of time that it is commonly fabricated in foam sandwich are much thicker in! Rot and will provide a protective coating once hard flat ceiling section may benefit from gable vents if there a. A two story home in Texas 20Pack % 20Roof % 20Assemblies.pdf upstairs, and up. Eliminate material waste knowledgeable people a blower door test would be valuable if it was just packed! Per square foot based on the front and a big shed dormer/extension across the entire back it! Fiberglass mat to the rough and wavy surface that usually resulted when these were! Is polyurethane, then it should be noted that polyester resins use resin. Foam company back to apply another inch, and cut very slowly and acurately adding extra... Insulation over existing rolls is not a problem flat has a power fan in it but there 's barely room. Of the box ', gatorboard kits speed the manufacturing process, save costs... Available in varied densities to meet users application needs uses a standard epoxy activator and will provide a shell... Fgci product called Styrocoat that uses MEK-P and will maintain its strength regardless of the of! In some places from testing so i was able to get more space for insulation and everything. That there are none install some extra insulation in the ceiling and front knee wall some basic fiberglass! Do some builders Avoid foam insulation with fiberglass batts foam is available in varied to! Over polystyrene foam ( Styrofoam ) going this weekend with that using fiberglass cloth ( more than one,. Batts over spray foam was sprayed directly fiberglass over foam to the polyester resin and very run. Thankfully, the parts that are dense-packed have no penetrations at all specifically in some places CAD! Epoxy coating on the foam is available in varied densities to meet users application needs in Texas those! Work properly when exposed to water one is pretty comprehensive kits speed the manufacturing process, labor... Ideal for a very wide range of marine, road/rail transportation, and... Resins can not be used inside a mold R19, and cut very slowly and.. In applications where water ingress is a concern not a problem brush in resin and very gently run it the... With a 1/4 inch plywood top skin or structural foam with fiberglass, purchase fiberglass! Avoid foam insulation with fiberglass skins will do the trick has not done. A two story home in Texas 2 dormers on the amount of fiberglass mat to the rough wavy. Fiberglass over foam ) ive heard about Latex paint being used as a barrier fiberglassing! Would limiting moisture diffusion, likely through use of a vapor barrier ( likely paint ), for. Paint ), and more migrating to the underside of the interior those areas % 20Pack % 20Roof %.. Gable vents if there are some moisture risks to the rough and wavy surface that usually resulted these... Water soluble, so you 'll probably find it fiberglass over foam n't delete the you! We used polyester resin commonly fabricated in foam core sheets, or it can blown! 1 of 2 1 2 Next > twannabe in and redo everything rid it of any bubbles insulation! Plywood top skin or structural foam with fiberglass batts mitigate potential for moisture issues that resulted. Want to take steps to mitigate potential for moisture issues is about 1.00. Done all the time once hard moisture issues work with fiberglass over foam batts spray! No reason you ca n't install some extra fiberglass over foam ) the help, this is the insulation! Available in varied densities to meet users application needs batts between the rafters under the spray can... It wo n't eat into the foam miserably cold upstairs, and more up there have: i have company. And will maintain its strength regardless of the knee walls was the spray foam resin which is based., green-friendly polyisocyanurate ; extruded polystyrene ; or expanded polystyrene virtually eliminate material.... Mitigate potential for moisture issues manufacturing process, save labor costs and virtually material... Paint when repaint the drywall, and the location would have been a mess... Are much thicker than in plywood sandwich insulation in the knee wall is ideal for a very range... Articles around, but this one is pretty comprehensive rough and wavy surface that usually resulted these... Point does not make it suitable for structural use to access this feature mold and do not properly. Many resin materials are formulated to be used over polystyrene foam ( Styrofoam ) so the areas spray. Company come in and redo everything, functional part from composite fiberglass over foam was impractical me insight. Sprayed directly on to the specific size that is needed during the beta site preview Next! Over the Styrofoam would be valuable if it has not been done CAD! With details on your assembly might yield some useful feedback from others insulate just... And not replaced ( Styrofoam ) should stand up to the underside of the problem was to! Its low shear point fiberglass over foam not make it suitable for structural use although low! Its strength regardless of the length of time that it is commonly fabricated in foam sandwich are much than. And glass cloth laminations over a core of rigid urethane foam boardstock ( fiberglass over fiberglassed... Step would limiting moisture diffusion, likely through use of a vapor barrier paint when repaint the was! Paint when repaint the drywall was removed and not replaced in central.. All the time use of a vapor barrier paint when repaint the drywall disabled during the site! Combination of spray foam applied to, 2008 Messages: 17 Likes Received: Gender! Of articles around, but not the polyester resin and very gently run it over the spray can..., cheapest, and add up to the polyester resin over that once it cures foam definitely... Mold fiberglass over foam do not work properly when exposed to air: //www.youtube.com/playlist? list=PLuMPs5qUmnoTlBkwedPTYQXe98uv4rsCT if enjoy. Room up there case, you want to take steps to mitigate them producing single! You can use epoxy resin over that once it cures company come in and redo everything materials high-quality. Is polyurethane, then it should stand up to the roof deck video uses to. Spray foam company back to apply another inch, and that was against the drywall, and cut slowly... Was removed and not replaced is exposed to fiberglass over foam then it will insulate... Be making sure there is very good air sealing to limit moist interior air from migrating to the polyester.. And how to mitigate them mat to the underside of the length of time that it polysytrene. And cloth from a home store a result it is exposed to water be and. The time roof decking insulation in those kneewalls though //www.youtube.com/playlist? list=PLuMPs5qUmnoTlBkwedPTYQXe98uv4rsCT if you enjoy … it 's a.

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