Category Archives: Wood

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

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

Posted by in Apparent Mold/Biological Growth, Attic Ventilation, 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

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

Inadvertent Reduction in Attic Ventilation

Posted by in Apparent Mold/Biological Growth, Attic Ventilation, Roof, Water Sources, Winter Concerns, Wood | May 30, 2014

We are often called to evaluate the source of moisture causing mold growth, water damage or wetting of building components in an attic.  These investigations commonly conclude with pointing out a roof or siding leak from a breach in the… Read More

Evaluating the History of a Leaning Garage

Posted by in Simple Forensic Methods, Wind Damage, Wood | April 28, 2014

Here are a couple tips for evaluating the history of a leaning garage. Sometimes a four foot level is helpful in measuring the lean of a garage.  Other times the lean is so obvious, no measurement is needed.    … Read More

What is Creep?

Posted by in Structural terms, Wood | March 10, 2014

Creep is a permanent sag in the wood member (it may also occur in concrete or masonry) caused by the stretching and adjusting of the wood fibers to the sustained weight on them, that is, the weight of the member… Read More

Traditional Sawn Lumber vs Engineered I-Joists vs Wood Trusses

Posted by in Wood | February 03, 2014

What’s best for floor joists in residential construction: traditional sawn lumber, engineered I-Joists, or wood trusses? The answer to this is more complicated than “which is the best.”  The answer is subjective.  That is, it depends not only on the… Read More

Is there anything new under the sun?

Posted by in Wood | January 27, 2014

  I got a real chuckle this week reading an article entitled Lateral Loads Generated by Occupants on Exterior Decks on page 36 in the January 2014 issue of Structure magazine.  As the title indicates it was about lateral design loads… Read More