The Skinny on Insulation




Mason contractors have a lot on their plates. You have to consider everything from A to Z as it affects your projects. So, what about insulation? Think it’s not really your concern? Think again. Masonry spoke with an expert in the area of insulation to garner the information you need to know. Richard S. Shupe is president of Oxford, Conn.-based Connecticut Insulation Distributors Corp. ( He has been in the construction business since 1970, having been with CIDC for 15 years. Following is what he had to say.

Richard Shupe: Insulation is an important component of the building’s envelope. If the mason is a conscientious craftsman, he feels some ownership of the entire wall system, not just his portion of it. Insulation is a part of the building’s system of air barriers, moisture barriers, fire-resistive barriers, sound barriers, and water-resistive barriers. These barriers are designed to protect the interior from unwanted external conditions.

Shupe: An air barrier prevents the passage of air through [the wall]. Warm air has a tendency to move toward cool air, so you want a barrier that will keep warm interior air from escaping in cold weather, and conditioned air from becoming warmed by outside air in hot weather. Insulation materials contain tiny air spaces within them that thwart warm air from moving toward cooler air, in either direction.

A vapor barrier keeps water vapor from going where you don’t want it. Vapor tends to move toward dryer air. In winter, when outdoor temperatures and humidity are low, vapor tries to drive itself through the interior walls to the outdoors, and the reverse occurs in the high humidity of summer. Neither is desirable, and when the vapors condense on cooler surfaces, it can cause moisture damage. In masonry wall systems, rigid insulation often can serve as a vapor barrier, although important exceptions exist involving climate and the building’s pressurization. Many vapor barriers are peel-and-stick membranes, but I find some of the liquid membranes are extremely user-friendly.

Water-resistive barriers prevent bulk water from entering the interior spaces. As all masons know, water can occur in any wall system, even brick or block. A water-resistive barrier intercepts that water and lets it exit the wall, usually through weep holes.

I think fire-resistive barriers and sound barriers are self-explanatory. In exterior wall systems, both can be materials that are also being used for other purposes. For instance, all insulating materials will help to suppress noise, and mineral-wool insulation can help to suppress fire for various periods.


Shupe: Not really. A weather wrap can serve as an extra air barrier to supplement the insulation, but it has no R-value itself. Its most important job, as a rule, is to block air and deflect bulk water, while letting vapor pass through. If it’s to be installed in masonry wall systems, its high vapor-permeability means it must be in proper conjunction with other low-permeability barriers. Otherwise, water vapors can pass into the wall cavity and cause problems. Like all products, weather wraps must be installed in strict accordance with building codes and the manufacturer’s instructions.

Shupe: They’re called “fluid-applied air barriers.” The best of them have low or no VOCs and HAPs, may also serve as vapor barriers, are effective with relatively thin coverage, and can withstand UV exposure for months before being enclosed. They can be spray applied or brush/roller applied directly to any gypsum board, plywood or concrete masonry substrate. They don’t need priming, and can be applied by a single worker. Since they’re liquids, they cover and seal protrusions neatly.

Shupe: Yes. I’m no tree-hugger, but my family and I breathe the same air and drink the same water as everyone else. So I hope specifiers study the MSDS for every product they specify. There’s no reason to use products containing hazardous materials if there are alternatives. Defenders may argue, “There’s just a little bad stuff in it.” But, when it’s being used in countless buildings, my reply is, “A lot of a little makes a lot!”

Related Posts

  • 70
    January 2012 Air Barriers New Breed How the latest air barrier technology helps mason contractors get bigger slices of project pies A technician demonstrates the ease of detailing rough openings with the “new breed” of air and water barrier products. Just gun it on and spread it out – no complicated tapes, fabrics or peel-and-stick…
    Tags: air, barrier, water, barriers
  • 68
    January 2011 Air Barriers and Insulation A look at today’s energy-efficient wall assemblies Metal Stud Wall with “Outsulation” to meet new ASHRAE 90.1 2010 requirement. By Chris Bupp The building envelope recently has become a focal point of architects, engineers and a growing number of consultants. The wall assembly now is viewed with the same…
    Tags: barrier, air, wall, building, insulation, barriers, vapor
  • 66
    July 2009 Air Barriers Understanding Air and Vapor Barriers By Jennie Farnsworth With moisture-related problems in both new construction and older buildings equally prevalent in the news, there is no doubt that air and vapor barriers should be a well used and understood tool in a designer’s bag of tricks. However, depending on a number…
    Tags: air, barrier, barriers, vapor, building
  • 64
    November 2012 Air Barriers Air Barriers: Impermeable or Permeable? By Jane Wu Air infiltration of buildings causes significant heating/cooling energy loss and permits moisture and condensation to collect in the walls. This interstitial condensation creates significant problems for buildings and occupants alike, including poor air quality, mold and mildew, and even structural damage. To prevent…
    Tags: air, vapor, wall, barrier
  • 56
    January 2014 Air Barriers A Crash Course in Air Barriers By Colin Szewaga All images courtesy of Hohhman and Barnard Continuous air barrier prevents moisture laden air from penetrating the backup wall Air barriers are mandatory requirements in two standards and two codes (ASHRAE 90.1-2010, ASHRAE 189.1-11, 2012 IECC and 2012 IgCC). These codes and…
    Tags: air, barrier, building


Zachary Zuldema 1st Place (2nd Year) Winner Interview at the World of Concrete

Zachary Zuldema 1st Place (2nd Year) Winner Interview at the World of Concrete

Bill Dentinger 2015 Inductee MCAA Hall of Fame

Bill Dentinger 2015 Inductee MCAA Hall of Fame

John Smith, Jr.

John Smith, Jr. receives the 2015 MCAA C. DeWitt Brown Leadman Award

2015 MCAA Fastest Trowel On The Block Winner

2015 MCAA Fastest Trowel On The Block Winner

Daniel Furr 1st Place Winner

Daniel Furr 1st Place Winner (First Year), Masonry Skills Challenge

Synpro Products

Masonry Magazine Video News Interview: Michael Goyne

Hydro Mobile Inc

Interview with Kevin O'Shea of Hydro Mobile, Inc.

Interview with Mark Kemp – Chairman, MCAA

Interview with Masonry Contractors Association of America Chairman, Mark Kemp

Mortar Net Solutions

Interview with Steve Fechino from Mortar Net Solutions

Pullman Ermator

Interview with Lyndon Kelsey of Pullman Ermator

Keene Building Products

Interview with Jim O'Neill of Keene Building Products