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Spray polyurethane foam (SPF), the high-density stuff,1 is the only product (so far) that can perform all of the functions of the principal control layers of the “Perfect Wall.”2 The functions are… Read More

You can’t replace experience and judgment with lab tests and a computer simulation. But when you add lab tests to the experience and judgment and have an adult supervise the process, you might be… Read More

Double Rubble Toil and Trouble1“When you insulate your basement on the inside, the rubble foundation will freeze apart, and you will get swelling from the freezing soil collapsing the wall, and… Read More

Hospitals are not fun places to work in, and they are not fun places to build and design or to fix and repair. The stakes are often high. Nothing is more sobering than when someone dies because of a… Read More

Spain gave Florida to the United States in exchange for the United States giving up any claims on Texas. We all know how that turned out. Nobody really wanted to live there except the Seminoles until… Read More

 Our story starts with a self-important politician taking a shower in a new home in Las Vegas in the mid 1990’s and ends with ten’s of thousands of houses with leaks and litigation. Our story will… Read More

After one hundred and fifty years the Illinois cottage1 is undergoing some pretty interesting changes and the ghosts of George Washington Snow and Augustine Taylor2 are cautiously eyeing the result.… Read More

As in most things gone horribly wrong, it is a bunch of seemingly small things that come together to create an almost unimaginable nightmare—in this case the “perfect stucco storm.”Unlike most water… Read More

General Limit States Design, Hygrothermal AnalysisAt a basic level a wall is an environmental separator.  It keeps the outside out and the inside in.  Easy to say, not always easy to do.To function… Read More

“gas separation processes and open cell low density spray foam”1Lots of attics insulated with open cell low density spray foam (Photograph 1, Photograph 2 and Photograph 3) are having problems – in… Read More