Walls using foam sheathing can meet all structural code requirements with simple specification and planning.

Tools & Education

Attachment of Windows with Integral Flanges Through Foam Plastic Insulating Sheathing to Wood Framing

Research report intended to supplement the window manufacturer's installation instructions, where installation over foam sheathing is not specifically addressed. Also suitable as an alternative method of installation based on commonly accepted field practice. Available as a sealed code compliance report. 

Vinyl Siding Over FPIS Report

Requirements for installation of vinyl siding over foam sheathing in thicknesses up to 4" when used as thermal insulation in exterior walls. Available as a sealed code compliance report. 

IRC Wall Bracing: A Guide for Builders, Designers and Plan Reviewers

This guide provides designers, code officials and builders a basic understanding of how to apply the IRC bracing provisions for code-compliant dwellings and how the IRC bracing provisions can be used to create maximum value in a diverse housing market.

Best Practices


Standard Requirements for Wind Pressure Resistance of Foam Plastic Insulating Sheathing Used in Exterior Walls

Practical Research

NYSERDA Fastening Systems for Continuous Insulation

As energy codes continue to become more stringent, the thickness of continuous installation has increased. This report examines problems and solutions for fastening systems where thick foam is used. 

Additional Information

General Dowel Equations for Calculating Lateral Connection Values

This report covers calculation of lateral values for single dowel type fastener connections to wood framing using a generalized and expanded form of the NDS yield limit equations that allows for a 'gap' in the connection for foam sheathing. 

Polyiso - Insulation Types

Includes information on the compressive strength of Polyiso

EPS - Compressive Strength

Information on the compressive strength of several types of EPS 

XPS - Standards

Includes information on the strength properties of several types of of XPS