XPS Technical Resources

This page provides important data for architects, builders, and specifiers, emphasizing why XPS is the preferred choice in thermal insulation.

Technical Bulletins

See XPSA’s bulletins regarding Canadian LTTR Compliance and RSI Design Values.

NFPA 285 & ASTM E119

Read the engineering extension letter for DuPont™ Styrofoam™ XPS, Kingspan^®GreenGuard^®XPS, or Owens Corning™ FOAMULAR^® XPS foam plastic insulation for Brick Industry Association (BIA) Thin Brick Exterior Wall Systems, and NFPA 285 and ASTM E119 Compliant Wall Assemblies.

Technical Insights

The Effects of Open Porosity on the Strength and Water Absorption of RCPS Foam Board Insulations

Technical Insights, Below Grade Series ID: TI-BG-13

The Truth about Water Absorption

Technical Insights, Below Grade Series ID: TI-BG-14

XPS Is the Proven Choice for Protected Membrane Roof Assemblies

Technical Insights, Protected Membrane Series ID: PMRA-03

Aging of XPS Insulation in Relation to a 15-Year Thermal Resistance Design Life

ID: LTTR Tech Brief

Basics of Thermal Resistance in Specifying Rigid, Cellular (PDF)

Technical Insights, Below Grade Series ID: TI-BG-11

Demystifying Rigid, Cellular Polystyrene Insulations (PDF)

Technical Insights, Below Grade Series ID: TI-BG-10

Making Sense of the ASTM C578 Types of Rigid, Cellular Polystyrene Insulations (PDF)