Rosboro’s Online Strategy

Though many companies in the building industry have been slow to adapt to the new age of technology, Rosboro has decided to dive into the online universe to spread the word about our family of products and make our customers’ jobs easier. From accessing our complete library of technical manuals to getting lighthearted updates on our Facebook page, you are always just a couple clicks away from finding the online information you need about Rosboro and our products.

Rosboro on Facebook

Rosboro Glulam MOE

Apparent E vs. True E (shear-free)

E Values

In theory, the total deflection, or elasticity, of a structural member accounts for both bending and shear stresses, but not all engineered wood manufacturers use the same standards in their published materials. This leads to the question, what is the difference between Apparent E and True E, and is one more “true” than the other?

Shear-free modulus of elasticity, commonly known as True E in the wood engineering industry, measures bending deflection of a structural member without accounting for shear deflection. This may raise the structural values on paper, but when it comes to code compliance, shear deflection ultimately must be calculated and combined with bending deflection.

Apparent E, on the other hand, does account for shear deflection by following an equation for simply supported beams subjected to uniform loads. That’s why most glulam manufacturers publish Apparent E values, but some companies are electing to publish only True E values, and the result is that there’s some confusion in the industry.

Rosboro has chosen to solve this dilemma by including both True E and Apparent E in our values charts, which our clients will find clearly indicated on the pages of Rosboro publications.

Click here to download a APA Technical Services document (summary).

Click here to download a APA Technical Topics document (includes calculations).