|Expired Engineering Certification|
Let's have a look at a few pages from TSDC's "engineering documents to see if the engineer received good data to work with.
At the left we see what the engineer based his load calculations on. See the big red box with the words "HORIZONTAL LOAD"? See the words the arrow is pointing to? "6063-T5" is the type of aluminum these calculations are based on. It has properties that are known/available to the engineer and those properties are what the engineer bases the load calculations on. But hold on... We know that The Sliding Door Company doesn't use 6063-T5 aluminum. They have a "proprietary formula" for their aluminum. So what do their "engineering" certifications mean? Absolutely NOTHING!
The components to the right and below were used in TSDC's engineering calculations. These are NOT the components they use in their installations (too expensive). They use this one (35 cents) which they have copied from a Simpson design and for which they have no engineering test data.