January 2009

SPF standards

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New ASTM International standards relating to SPF roof systems may cause confusion

by James R. Kirby, AIA
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The spray polyurethane foam (SPF) industry has been active in the standards development arena, and, within the past couple of years, two new ASTM International standards have been released that directly relate to SPF roof systems. Roofing professionals need to understand which standards currently exist and the new standards' implications.

ASTM D7119, "Standard Guide for Sampling Spray Polyurethane Foam and Coating in Roofing," was approved in 2007 and provides guidelines for the field removal of test specimens from new or existing SPF roof systems. It describes the types and purposes of sample cuts, visual inspection techniques, laboratory physical property tests, and repair procedures for core and slit sample holes.

ASTM D7425, "Standard Specification for Spray Polyurethane Foam Used for Roofing Applications," was approved in 2008 and provides types and physical properties of SPF used in roof systems.

Two previously existing ASTM International standards applicable to SPF roof systems are ASTM...

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