ft. Closed cell foam for insulation applications range in density from 1.7 lb./cu. However, closed-cell foam is worth the investment for its resistance to vapors, air, and other conditions that open-cell foam is not as protective against. Open cell spray foam is a light density insulation product. Roof deck: open-cell or closed-cell foam ... Unvented roofs - Closed cell vs Open cell Spray Foam ... What is Better Open or Closed Cell Insulation ... on the interior side of any open-cell spray foam installed on the underside of roof sheathing. Closed-cell spray foam has an R-value of about 6.0 per inch (R-6), while open-cell SPF comes in at roughly R-3.5. While the denser closed-cell variety does not readily absorb moisture, open-cell foam can draw it in like a sponge. Open-cell spray foam is breathable. ft. Roofing applications typically use a 2.8 to 3.0+ lb./cu. Cheaper form of foam insulation compared to closed cell and it's highly effective. Types of Spray Foam Insulation - Closed Cell and Open Cell. Should I Vent a Roof Insulated With Spray Foam? - Fine ... Closed cell foam is much denser than open cell foam. Open cell foam has an R-value of about 3.5 to 3.7 per inch, while closed cell foam has an R-value of about 6 per inch. If the pole barn walls will be exposed, then closed cell spray foam is the better option. Open cell spray foam is the most cost-effective way to insulate a metal roof. Closed Cell Spray Foam. Reason Foam Fails #5 Excessive Shrinkage Fine Homebuilding, Feb/March 2012 With the growing use of foam plastic insulation in building construction, first in commercial roofing and then too often metastasizing over the entire building enclosure, it is being used increasingly as an air barrier component. Closed cell spray foam costs $1.30 to $2.00 per board foot, while the price for open cell spray foam is between 60 cents to $1 per board foot. This helps ensure that if water does seep beneath your shingles, it will not sit between the spray foam and roof, creating rot. Both open cell and closed cell spray foam insulation have the unique ability to create a complete and an effective air barrier. Open Cell Spray Foam (3.5R-value) costs about $0.35 to $0.45 per foot-inch, depending on where you live in US. Features and Use of Closed-Cell Spray Foam Insulation Closed-cell offers: Open-cell foam is not as dense as closed-cell rigid foam. It also has about twice the R-value of open-cell spray foam insulation. Lapolla Products Spray Foam Insulation Closed Cell FL 2000 FL 2000 4G FL X Open Cell FL 450 FL 500 FL 750 FL Retrofit Roof Insulation & Coating Roofing Systems Spray Foam Roofing Restoration Coating System Roof Coatings THERMO-FLEX THERMO-SIL THERMO-SIL NP GE ENDURIS Wall Coatings WALL-LOK Technical Resources Technical Data Sheets Architectural Specifications Detail […] The cells making up the rubber are closed. R-value for open cell SPF is about 3.5 per inch or board foot, while closed cell achieves R6 to R6.5 per inch/board foot. If there is ever a leak in the roof into the attic, the open cell won't conceal it like closed cell has the tendency to do. If the open cell needs to be cut to repair the leak in the roof, it's very pliable and easy to work with. Click on any of the spray types below to learn more about the advantages and use cases for each type of spray solution. To give you an idea of what the price difference would be between the two: 2,000 sq ft of roof R-38. If you can go down to 1" vent space, you get an R2 with open cell for very small extra installation charge. Open Cell Spray Foam Insulation: Breathability, Great Soundproofing. While open-cell can be more affordable, it often requires a thicker application, so it can be ideal if a building's framing is thick enough. It also allows any moisture to pass through it. Provides R-3.5 per inch. Generally speaking, open cell foam is better suited for residential applications— specifically above grade in exterior walls, roof lines, attic floors, and areas that need soundproofing. HOT AND HUMID CLIMATES - ZONES 1 THRU 4. Closed Cell Foam is like the material in a west sout for a scuba diver It is not porous. This give you an R22 roof, but would cost significantly less. ft. to 2.0 lb./cu. Attic Integrity When There Is No Ventilation If she gets the open cell it'll be left exposed to the sun and condensation and all I can say is I hope it works out . With a full cavity fill of open cell foam it would be lower R-performance but it would also allow more moisture into the roof deck from interior moisture drives, risking rot over large sections of the roof (particulaly shaded or north facing roof pitches.) Unvented roof strategies with open cell and closed cell spray polyurethane foam (ocSPF and ccSPF) insulation sprayed to the underside of roof sheathing have been used since the mid-1990s to provide durable and efficient building enclosures. By comparison, closed cell insulation systems have a density measurement of 2.0 pound per cubic foot and are much stronger and harder. Unit price primarily comes down to which of the two types of spray foam insulation you choose: open-cell or closed-cell. All products are tested to ASTM standards and installed by approved contractors trained in product application and building science. Closed cell foam is often used in flotation devices, since its closed cell structure does not absorb water and trapped air is energetic. Closed-cell spray foam insulation is highly efficient. Closed-cell spray foam insulation fills cracks and open spots immediately following application. Open cell foam can also be used for sound dampers, shock absorbers, cushioning and pillows. Open cell foam is air permeable and need a vapor barrier over the walls. Because of the unique application process and the material itself, it is lightweight, durable, highly water and fire resistant, and has one of the highest R Values , thus saving costs on heating and . Open cell foam is typically R-3.5-R-4.0 per inch as opposed to R-6.0-R-7.0 (aged) for closed cell foam. ft. to 2.0 lb./cu. Open cell foams typically weigh in at 0.4 to 0.5 lb./cu. Closed cell foam can also increase the racking strength of attic walls, which . Most of these damp-sheathing problems involve open-cell foam rather than closed-cell foam. I recently added an elevator shaft to the side of my post frame building, which has steel roofing and siding. Ranging between $.90 and $3 per board foot, closed-cell foam is typically more expensive than open-cell, which costs between $.25 and $1.50 per board foot. If you use closed cell foam on the inside it acts as a non-permeable vapor barrier on the inside. Since vapor retarder paint wont work unless drywall is first installed on the interior side of the closed-cell spray foam — and since installing drywall is expensive — most cold-climate builders avoid the use of open-cell spray foam in attics. Both companies inflated the cost to do 3-4 inches of open cell spray foam just so their bid was 5-600 dollars less than mine. This is most effective in Florida Attics as the heat gain from the sun beating on the roof along with hot, humid outdoor air entering through the vents can make an attic unbearably hot which negatively impacts your A/C . Yes closed cell is more expensive, however you can eliminate the need for building wrap to help offset some of the added investment. While it doesn't have as high of an R-value as closed cell, it is still far more effective and energy efficient than the other traditional products. 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