It is a lose-lose scenario. FOAMULAR® 400 High Compressive Strength Rigid Foam Insulation. A common type of XPS (such as Dow’s Styrofoam or Foamular from Owens Corning) and Type IX EPS is rated for 25 psi. Since XPS typically costs more per inch than EPS, this is wasted money that comes off the contractor’s bottom line. The most important mechanical property of EPS insulation and building products is its resistance to compressive stresses, which increase as the … Pages 21 This preview shows page 15 - 17 out of 21 pages. Since EPS is lower cost per inch than XPS, and is available in a range of compressive strengths (from 10 to 60 psi), using it belowgrade and under slabs can save on insulation costs… Two of the rigid foam insulations most commonly used below grade and under slabs are expanded polystyrene (EPS) and extruded polystyrene (XPS). Using an unnecessarily high-strength insulation, you end up paying for something you don’t really need. 3 Ways EPS Insulation Helps Improve Indoor Air Quality at Home, Food for Thought: Lessons in Cold Storage, “Great things are done by a series of small things brought together.”. Our insulation is thin and lightweight, making it easy to conform to your grade and reduces any worry of leaving pockets or voids like traditional insulation. Like compressive strength, molded polystyrene’s thermal insulation capacities are also quite exceptional. Contact Us: Click here to contact the Insulfoam location near you. A 15-year in-situ test of EPS and XPS dramatically demonstrated this point. If you need something with higher compressive strength… The high moisture absorption rate of XPS in real-world settings is further seen in a 2012 report from the U.S. Dept. The other consideration for sub-slab use is the foam’s compressive strength. With the widest range of faced, laminated and standard high-performance EPS insulation products Insulfoam has the right products for your needs while still providing the highest R-Value per dollar over any other rigid insulation. P = concentrated load on concrete slab in pounds, K = Subgrade reaction modulus of total EPS insulation in pounds per cubic inch (k/t), k = Stiffness of one inch of EPS insulation in pounds per square inch, E = Modulus of elasticity of concrete in pounds per square inch (57000√ f’c), f’c = specified concrete compressive strength in pounds per square inch. With building owners’ growing desire to save money on heating and cooling costs, and increasingly stringent energy codes, contractors will be installing below-grade and under-slab insulation on more of their projects. One of the best ways to save money on rigid foam insulation installed under concrete slabs is to ensure the material is not over-engineered. An overly conservative design approach often results in specification of a high compressive resistance XPS product, when a more cost-effective EPS would offer sufficient strength. After 30 days of drying time, the EPS had only 0.7 percent moisture by volume, while the XPS still contained 15.7 percent moisture. The problem is that designers often do not adequately account for how the concrete slab and underlying subgrade interact. Where compressive loads are applied to the insulation layer, such as under a concrete slab: Stress limits provide a factor of safety and a means to limit long term compressive creep in the insulation layer The … Advantages . But, what does independent testing and research say? By comparison, most XPS warranties typically cover only up to 90 percent of the published R-value, to account for the R-value degradation that occurs in the field. Yet, concrete slabs distribute loads more uniformly than this, which means the insulation does not need as high of a compressive resistance as when one assumes a concentrated triangular load path. School Harvard University; Course Title MN 5512; Uploaded By cassmtiii. Below Grade and Under-Slab Building Insulation. FOAMULAR® 150 has a compressive minimum PSI of 15 FOAMULAR® 250 has a compressive minimum PSI of 25 FOAMULAR® 400 has a compressive minimum PSI of 40 FOAMULAR® 600 has a compressive … Such insulation helps reduce heat loss to the ground in residences, cold storage units, warehouses and other commercial, institutional and industrial structures. Using a design equation based on a more rigorous analysis of the design conditions can help avoid over-engineering the insulation and save thousands of dollars on the project. Forklifts to be used in the building impart 8,000 pounds of force at the wheel, which has a 6-inch by 10-inch tire footprint on the slab. Without getting into extensive technical details and mathematical formulas, the problem is engineers often use an overly conservative approach for insulation under concrete slabs. Compressive strength testing of various reflective insulation products indicates that they exhibit less than 10% compression in thickness … Take the case of a warehouse with a 6-inch-thick, 2,500-psi concrete slab on 2 inches of EPS insulation with a rated stiffness of 360 psi for one inch. [divider] Forklifts to be used in the building impart 8,000 pounds … The structural engineer determines the vertical compressive strength … EPS insulation in an under-slab application. Garages are notoriously poorly insulated, with the big and poorly sealed garage door being Issue #1. Rigid foam insulations, such as expanded polystyrene (EPS), have been used successfully under concrete slabs for more than 40 years. XPS has a higher initial insulating R-value than does a similar thickness and density of EPS, but the R-value of XPS degrades over time. It can … A simple way to confirm an insulation’s long-term thermal performance is to review the warranty. They can, however, be installed above the raft slab… A common design assumption leads to specification of rigid foam strengths that are many orders of magnitude higher than necessary, which can double the insulation material cost. Copyright 2021 Insulfoam Privacy Policy | Terms & Conditions | Site Map | Insulnet, Baltimore Area Bike Retailer Expands with R-Tech Insulation, New Mexico Schools Save on Construction Costs with EPS Insulation. This is a crucial point when selecting insulation, as a decreasing R-value means lower thermal performance over time, and thus increased heating and cooling energy and costs for the building owner. Puyallup, WA 98387. Unlike traditional bubble insulation… Save my name, email, and website in this browser for the next time I comment. If the designer assumes that this load distributes at a 45-degree angle through the slab, the 8,000 pounds ends up distributed over approximately 396 square inches [(6 + 6 + 6)(6 + 10 + 6)] of the insulation’s surface, for an average pressure of 20.2 psi. The subgrade modulus of what is below the insulation may be 100-125 pci, but it doesnt matter if I cant verify that my freezer insulation … Insulfoam is a division of Carlisle Construction Materials, a wholly owned subsidiary of Carlisle Companies (NYSE: CSL), and is the nation's largest manufacturer of block-molded expanded polystyrene (EPS). For example, a typical case might involve a 100-mm (4-in.) Excellent compressive strength; Moisture resistant; Excellent thermal performance; 50 year durability when installed and used correctly; Multiple options - size - strength … To receive insulation and Insulfoam updates, join our email list, Log in Note that increasing the thickness of EPS insulation decreases the overall subgrade modulus. Under Floor Slabs For Under Floor Slabs, FOAMULAR® 150 or 250 can be used for residential and light commercial applications where floors are subject to normal loads; use FOAMULAR® 400, 600, or 1000 … When reflective insulation materials are used below concrete slabs, it is important that they withstand the weight of the slab without damage to the insulation. EPS does not experience such “thermal drift,” and the reported R-value remains the same throughout years of installed service. Take the case of a warehouse with a 6-inch-thick, 2,500-psi concrete slab on 2 inches of EPS insulation with a rated stiffness of 360 psi for one inch. thick concrete slab under a forklift load of 3629 kg (8000 lb… Owens Corning™ FOAMULAR® 400, 600 and 1000 are high strength extruded polystyrene … Required fields are marked *. Compressive strength and panel sizes Although both XPS and EPS are available in compressive strengths of 15, 25, 40, and 60 psi, XPS also comes in 100 psi. Koolfoam Under Slab Insulation . E = 57,000√ 2,500 = 2,850,000 psi, u = 0.15, D = Eh3/12(1-u2) = 2,850,000 (6)3/12(1–(0.15)2) = 52,480,818 lb-in. Although both are closed cell insulations, they perform very differently over the long term. Sales reps, naturally, will tell you that their company’s product is best. 19727 57th Avenue East Their researchers found that XPS insulation installed below grade for 15 years had absorbed 67 percent or more moisture. In the example application discussed in this article, the simplifying assumption of triangular load transfer through a concrete slab results in a compressive force on the insulation 11 times higher than the result from the more rigorous (but not much more complicated) analysis. Ground floor - insulation below concrete slab Thermal insulation is usually installed below the floor slab in buildings featuring continuous, low-level heating. In reality, concrete slabs distribute loads evenly, which results in a lower compression strength needed for the insulation. Underslab Insulation Unitherm® delivers the high compressive strength and efficiency required in residential slabs, preventing thermal loss through the ground. Although XPS often rates better in laboratory short term, fully submerged tests, real-world long term tests show that EPS performs much better. The spec for freezer slab insulation only provides compressive strength and safety factors. Ravatherm XPS has high compressive strength, ideal for heavy-duty environments. He’s uncertain whether to insulate the slab … A more accurate approach to this problem is to use the Modulus of Subgrade Reaction (K) to determine the slab’s deflection and the resultant stress applied to the elastic insulation subgrade. The pressure beneath a given slab under a load can be determined using the following formula, found in the Theory of Plates on Elastic Foundations, as described by Timoshenko and Woinowsky-Krieger: Pressure on the subgrade = (P/8)√(K/D) Where: An example illustrates the significant difference in the calculated results. Using the above method to determine the pressure that a slab transfers to the subgrade allows for proper specification of rigid foam insulation and avoids over-engineering the insulation for compressive strength. Ravatherm XPS offers a range of benefits when used as under slab insulation. 2. This ability to dry at a fast rate helps EPS remain drier during conditions of repeated exposure to moisture. For over 50 years, Insulfoam has been enabling building professionals to construct high-quality building insulation systems at a minimal cost. A simple solution for contractors is to ask the designers if they are using a formula from the Theory of Plates on Elastic Foundations, which take into account how slabs and insulation behave together.
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