Division 7 Ebook Page 530 FOAMULARŪ XPS Insulation Foundation Properties for Load Bearing Slab Applications

Technical Bulletin FOAMULAR Extruded Polystyrene (XPS) Insulation Foundation Properties for Load Bearing Slab Applications OWENS CORNING FOAM INSULATION, LLC ONE OWENS CORNING PARKWAY TOLEDO, OHIO 43659 1-800-GET-PINK www.owenscorning.com Pub. No. 10015706. Printed in U.S.A. August 2011. THE PINK PANTHER & 1964-2011 Metro-Goldwyn-Mayer Studios Inc. All Rights Reserved. The color PINK is a registered trademark of Owens Corning. 2011 Owens Corning. Disclaimer of Liability Technical information contained herein is furnished without charge or obligation and is given and accepted at recipient's sole risk. Because conditions of use may vary and are beyond our control, Owens Corning makes no representation about, and is not responsible or liable for the accuracy or reliability of data associated with particular uses of any product described herein. Nothing contained in this bulletin shall be considered a recommendation. FOAMULAR extruded polystyrene (XPS) insulation is suitable for use under concrete slabs. The FOAMULAR insulation compressive strength needed is determined by load on the slab, and the thickness and reinforcing of the slab. Although many solutions are possible with proper engineering design, FOAMULAR 250 insulation is commonly used under residential slabs, FOAMULAR 400 and 600 insulations are commonly used under industrial slabs, and FOAMULAR 1000 insulation is required only in extraordinary loading situations. The FOAMULAR Insulation Foundation Properties table provides engineering data for individual project analysis if needed. FOAMULAR Insulation Foundation Properties FOAMULAR Product Foundation Modulus (pci) 1, 2, 3 Compressive Stress (psi) Thickness (in.) Live 5 Recommended Dead 5 Recommended Ultimate 4 1" 1.5" 2" 2.5" 3" 4" 150 590 550 500 450 400 300 3 5 15 250 750 710 675 595 565 510 5 8.3 25 400 1,100 1,000 900 780 680 650 8 13.3 40 600 1,520 1,400 1,275 1,150 1,040 790 12 20 60 1000 - - 2,600 - - - 20 33.3 100 1. Foundation modulus is a measure of deflection at given loads, expressed as inches deflection per inch of thickness or "pci". 2. For insulation installed in multiple layers, assuming the layers are identical, the foundation modulus for the system equals the foundation modulus for one of the layers divided by the total number of layers. 3. For insulation systems that utilize a variety of thicknesses, the system foundation modulus is determined by adding the reciprocal of the foundation modulus of the individual layers. The total is the reciprocal value for the foundation modulus of the entire system. 4. Ultimate compressive stress is measured at 10% deformation or yield, whichever occurs first. For thinner product (1"), yield typically occurs first. For thicker products (1.5" and thicker), yield typically occurs first with 3% to 4% deformation. 5. Recommended stress (load) levels will limit long term compressive creep to not exceed 2% in 20 years.

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