Category Archives: Wood

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

The Making of a Ceiling Collapse

Posted by in Ceilings, Simple Forensic Methods, Wood | January 16, 2014

We have seen ceiling collapses that have been caused by pressurizing of the attic with high winds after a gable end wall failure, from someone stepping on the drywall rather than the ceiling when in an attic, or from excessive… Read More

Collar Ties Vs. Rafter Ties

Posted by in Roof, Structural terms, Wood | January 02, 2014

In common rafter framing the rafters support the weight of the roof construction and snow or live load by pushing against the opposing rafters (at the ridge plate at the peak), pushing horizontally outward at the top of the supporting… Read More

My Roof is Sagging (Encore)

Posted by in Archive 2004 thru 2011, Roof, Wood | November 04, 2013

Until homeowners see the ridge of their roof sagging or a big dip in the plane of the roof, they care little about how their roof is framed. When they observe a sag or dip in their roof they begin… Read More

The Structural Fascia Board

Posted by in Roof, Structural terms, Wood | September 30, 2013

“It is our professional opinion that it is poor construction practice to support roof joists on the fascia board at the ends of the roof rafters.”  We have rendered this professional opinion with minor variations more than few times. The… Read More

They Don’t make ‘Em Like They Used To – Update #4 (February 20, 2013)

Posted by in Wood | February 25, 2013

Over the past year or so we have been posting on the changes in the design values for Southern Yellow Pine.  You might recall that 2011 test results for the strength values of 2×4 lumber showed that the strength values for… Read More