Constructor - September/October 2014 - (Page 53)

Spray Polyurethane Foam A Candid Look BY RICK DUNCAN ZERO-ENERGY BUILDINGS, LOW-ENERGYUSE homes and high-efficiency construc- tion: incredible advances within the construction industry have made such buildings possible. From improvements in fenestration products to more efficient HVAC systems, today's buildings provide impressive energy savings.  @Constr uctor Ma g One product that plays a major role in the overall efficiency of a building is insulation. For decades, spray polyurethane foam (SPF) has been used in buildings as insulation and roofing. This versatile product provides a high R-value (measure of thermal resistance) insulation, helping regulate the temperature and reduce energy use in warehouses, buildings and homes. It can help make walls more soundproof and certain types of SPF are water resistant making them versatile options for basements and other applications where resistance to moisture is a key factor in product selection. It is a product that AGC of New York member Henderson - Johnson Co. Inc. has long stood behind. "We've been installing spray foam for 35 years," Henderson - Johnson Vice President Todd Henderson explains. "It is, in our opinion, the best insulation available. In addition to providing thermal benefits, closed cell foam also is an air barrier and vapor retarder." But despite its long history of use and versatility, many design and construction professionals still have questions about using SPF in their projects. When to use closed-cell or open-cell SPF? Is a vapor retarder needed? Are there any health or safety concerns? Are there lasting airquality effects? Is it an effective air barrier? How well does it resist moisture? Is there a structural benefit to SPF? CHOOSING A TYPE For building insulation, there are three different types of SPF. First is low-density open cell SPF, also known as ½-pound foam. This product uses water as the blowing agent. When the foam forms, the water reacts with the other chemicals to produce carbon dioxide (CO2) which expands the cells S E P T E MB E R / O C T O B E R 2 0 1 4 | 53

Table of Contents for the Digital Edition of Constructor - September/October 2014

Editor’s Note
President’s Message
CEO’s Letter
All for One and One for All
Elector Set
The Construction Advocacy Fund: Funding the Fight
New Revenue Recognition Standard Developed With Construction Industry Input
Business Development
Enhancing the Design and Impact of Company Websites
Construction’s Crystal Ball
Simonson Says
AGC in Action
Squeaky Clean Construction
Spray Polyurethane Foam: A Candid Look
Technology Toolbox
Legislative and Regulatory News
Member and Chapter News
2014 Insurance Directory
Government Affairs
Index to Advertisers
Final Inspection

Constructor - September/October 2014