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Technical Bulletins

In order to provide the most up-to-date technical and industry information about polyiso insulation, PIMA—the trade association of the polyiso industry—researches and posts technical bulletins, advisories and case studies. These documents are published as a public service to help expand the knowledge of architects, consultants, building owners and roofing contractors and to build consensus on the performance characteristics of polyiso. Individual polyiso manufacturers should be consulted for specifics about their respective products’ performance and applications.

Series 100, 200, 300, 400, 500 - Français

100 Series: Polyiso Roof Insulation

Technical Bulletin 101: "Roof Insulation Specimen Conditioning Procedure"
Describes the industry accepted procedure for determining R-value for impermeably faced polyiso products.

Technical Bulletin 102: "Compressive Strength"
Discusses the ability of rigid foam board to resist deformation or maintain shape when a force or load is applied.

Technical Bulletin 103: "Fire Performance in Walls and Ceilings"
Discusses polyiso insulation as it relates to building codes in construction and fire tests in walls and ceilings including ASTM E84 and ASTM E119.

Technical Bulletin 104: "Fire Performance in Roof Systems"
Provides an overview of polyiso insulation requirements for roof systems and key issues in fire performance, including the importance of the FM 4450 Calorimeter Tests and the UL 1256 resistance to interior spread of flame test.

Technical Bulletin 105: "Fire Test Definitions"
Provides an in-depth look at fire test procedures to building applications. Specifically, the bulletin reviews the following tests:

  • ASTM E84 Standard Test Method for Surface Burning Characteristics of Building Materials

  • ASTM E119 Standard Test Method for Fire Tests of Building Construction and Materials

  • Factory Mutual Roof Tests

  • Underwriters Laboratories, Inc.

  • Roof Tests FM Calorimeter Test

  • ANSI/UL 1256/Resistance to Interior Fire Spread Test

  • The White House Test FM 4880 25" High Full Scale Corner Test

Technical Bulletin 106: "Polyiso Nailbase Insulation and Asphalt Roof Shingles: Design Considerations"
Provides an overview of the design considerations that should be addressed when installing asphalt roof shingles with polyiso insulation in steep slope roofing systems. The bulletin discusses the following design issues:

  • Ventilation: Benefits of providing a ventilating airspace

  • Shingle buckling: Steps to prevent shingle buckling

  • Vapor and air leakage controls: Controlling vapor diffusion and air leakage

  • Recommendations for installation: Details for proper construction

Technical Bulletin 107: "Dimensional Stability of Roof Products"
Provides an overview of an important characteristic of all roof materials—dimensional stability – and includes a review of the various tests that can be used to measure dimensional stability.

Technical Bulletin 108: "Tapered Insulation Systems"
Explains how a tapered roof insulation system is used to reduce or eliminate the amount of ponding/standing water on the membrane when the roof deck does not provide adequate slope

Technical Bulletin 109: "Storage and Handling Recommendations for Polyiso Roof Insulation"
Explains how to care for polyiso insulation on the job site and when stored.

Technical Bulletin 110: "Polyiso and Single-Ply"
Addresses good roofing practices that will help promote successful bonding of single-ply membranes with polyiso insulation

Technical Bulletin 111: "Class A and Class 1 Roof Assemblies Are Not the Same"

Explains why Class 1 and Class A are not the same.

Technical Bulletin 111C: "Roofing Regulations in Canada: Class A and Class 1 Roof Assemblies Are Not the Same"
Explains why Class 1 and Class A are not the same.  

Technical Bulletin 112: "Moisture Generated During Construction"

Highlights the causes and ways to prevent moisture generated during construction.

Technical Bulletin 113: "Multi-Layering of Polyiso Roof Insulation"
Highlights the benefits of multi-layering polyiso roof insulation.  

Technical Bulletin 114: "Ventilated Nail Base for Commercial and Residential Sloped Roofs"
Explains the energy efficient benefits of a vented nail cased system.

Technical Bulletin 115: "The High R Roof: Guidelines for Energy-Efficient Roofing and Re-Roofing"
Highlights how a High R Roof saves money, increases the energy efficiency of a building and reduces carbon emissions

Technical Bulletin 116: "An Integral Part of Sustainable Building and Leed Credits"
Explains how polyiso insulation may contribute to prerequisites and credits in LEED rating categories.

Technical Bulletin 117: "A Guide to the Classification of Polyiso Board Insulation Products" 
Discusses different the facer types of polyiso insulation boards and helps buyers and specifiers select the right board type for the job. 


200 Series: Polyiso Roof Insulation Compared to Other Products

Technical Bulletin 201: "A Comparison of Polyiso Insulation and Extruded Polystyrene Insulation"
Highlights the differences between polyiso and extruded polystyrene insulation. The bulletin specifically reviews:

  • Thermoset vs. Thermoplastic

  • Impact of Construction Materials on Insulation

  • Fire Test Performance

  • Tunnel Test

  • Ultraviolet Light

  • The Freeze/Thaw Myth

  • Thermal Performance

  • Moisture

  • Construction Costs

Technical Bulletin 202: "Polyurethane and Polyiso: What is the Difference?"
Discusses the basic differences between polyurethane and polyiso insulations. The bulletin explains the development of both types of insulation, their chemical differences, and thermal performance.


300 Series: Polyiso Sheathing Insulation

Technical Bulletin 301: Polyiso CI Performance in Residential Wall Applications
Provides an introduction to the benefits of Polyiso CI and the key performance considerations for use with residential wall construction.

Technical Bulletin 302: Wall Bracing with Polyiso CI
Outlines the common wall bracing techniques that can be used with Polyiso CI to ensure the structural integrity of the wall while reducing the cost of construction. 

Technical Bulletin 303: Moisture Control with Polyiso CI
Explains the basic building science behind moisture transport through residential walls and explains how Polyiso CI offers a solution to address the concerns of moisture intrusion and accumulation. 

Technical Bulletin 304: Energy Efficiency with Polyiso CI
Highlights how Polyiso CI improves residential energy efficiency by minimizing the impact of thermal bridges and thus reducing energy losses and gains.


400 Series: Polyiso Cavity Wall Insulation

Technical Bulletin 401: "Polyiso Insulation in Masonry Cavity Walls"
Looks at the role of polyiso insulation in a masonry cavity wall.

Technical Bulletin 402: "Polyiso Insulation and Water Absorption: Does Moisture Matter?"
Looks at the role of the cavity wall as a moisture-deterrent and how polyiso insulation can help.

Technical Bulletin 403: "Continuous Insulation Using Polyiso Wall Sheathing"
Outlines best building practices when using polyiso insulation in a continuous insulation system for commercial walls. 

Technical Bulletin 404: "Moisture Sorption of Building Materials"
A primer on the moisture sorption characteristics of building materials like polyiso.
Technical Bulletin 405: "Fire Resistance Properties of Polyiso Foam Plastic Insulation Used in Wall Assemblies - Facts and Comparisons"
Looks at the minimum fire resistance properties required for foam plastic insulation and compares data on polyiso with other recognized combustible materials.

Série 400: Isolation Des Murs Creux

Bulletin technique de la PIMA no401:
"L’isolant de polyiso dans les murs creux de maçonnerie"

Bulletin technique de la PIMA no402:
"L’isolant polyiso et l’absorption de l’eau: L’importance de l’humidité"

Bulletin technique de la PIMA no403:
"Isolation continue grâce au revêtement mural en polyiso"

Bulletin technique de la PIMA no404:
"Sorption de l'humidité de matériaux de construction"

Bulletin technique de la PIMA no405:
"Les propriétés de résistance au feu de l’isolant de polyiso en mousse plastique utilisé dans les murs" 

500 Series: High-Density Polyiso (HDP) Cover Boards

Technical Bulletin 501: "High-Density Polyiso Cover Boards"
Highlights performance benefits of High-Density Polyiso (HDP) cover boards and ease-of-use advantages compared to alternatives in the cover board market.

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