Author Archives: Jerry Prugar

Some Evidences of Recent Movement

Posted by in Cracking, Masonry, Simple Forensic Methods, Wood | September 08, 2014

We are often called in to evaluate as to whether some particular damage is old or new, that is, did it occur recently as reported or has it been present and possibly progressing for years.  As experienced forensic engineers we… Read More

Evaluation of Concrete for Fire Damage

Posted by in Concrete, Fire Damage, Simple Forensic Methods | August 25, 2014

Just read a well-written article in Structure magazine about evaluating fire damage to concrete foundations, entitled Engineering Evaluation of Fire Damage to Concrete Foundations, by Peter Marxhausen, M.S., P.E.  Mr. Marxhausen writes about his approach to evaluating numerous concrete foundations… Read More

Bulging in a Clay Brick Wall

Posted by in Cracking, Masonry | August 18, 2014

What causes a clay brick wall to bulge outward as we see in Photo CBW-1?     A bulging clay brick wall is an unexpected sight to most observers.  When one becomes aware of a bulging brick wall one is… Read More

Can Ventilation Really Reduce Condensation and Mold Growth in an Attic?

Posted by in Attic Ventilation, Mold Growth, Roof, Wood | August 11, 2014

Most in the construction industry know that the attics of wood framed structures require adequate ventilation to reduce the risk of the condensation of excessive airborne moisture and the resulting mold growth. But, how much does ventilation reduce condensation and… Read More

When Winterizing a Swimming Pool

Posted by in Swimming Pools | August 04, 2014

Here’s an important reason to lower the water level in a swimming pool when winterizing. If the water level is not properly lowered in a swimming pool when it is closed for the season, that is, the water level is… Read More

A Roofer’s Nightmare

Posted by in Roof, Unusual | July 28, 2014

Roof leakage through an asphalt  shingle roof covering can be the result of many causes.  Sometimes the shingles were damaged by some event, other times its severe wear from aging, we have seen improper installation, or as we discuss here… Read More

Some Comments Regarding Soffit (or Overhang) Vents

Posted by in Attic Ventilation | July 21, 2014

Soffit (or overhang) vents provide free vent area for cooler or drier air to enter into the attic and replace the hotter and/or damper air that vents out through the upper vents comprised commonly of a power vent, ridge vents,… Read More

Did You Know? (Lumber)

Posted by in Wood | July 14, 2014

Some Interesting Effects of Moisture on Lumber Sawn Lumber Raising the moisture content in sawn lumber from normal use conditions (moisture content < 15%) to fully saturated decreases the stiffness about 25%, thus increasing deflection immediately by 33%. Creep is… Read More