Technical Bulletins

XPSA Bulletins: LTTR Compliance, and Design RSI Values All construction materials (wood, steel, concrete, foam insulation, etc.) are impacted by their exposure to the in-service environment. See XPSA’s bulletins regarding LTTR Compliance and RSI Design Values.

Read the PDF – LTTR Compliance
Read the PDF – RSI Design Values



About XPSA

The Extruded Polystyrene Foam Association (XPSA) is a trade association representing manufacturers of Extruded Polystyrene Foam (XPS) insulation products and the industry's raw material suppliers. XPSA members collectively manufacture more than 95% of all XPS destined for use in the North American market. XPSA promotes the benefits that accrue to society from appropriate use of XPS foam insulation applications.

© Copyright 2016 The Extruded Polystyrene Foam Association

XPSA Headquarters

750 National Press Building
529 14th Street, NW
Washington, DC 20045

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