Need a book? Engineering books recommendations...

Return to index: [Subject] [Thread] [Date] [Author]

RE: eng info on dwgs

[Subject Prev][Subject Next][Thread Prev][Thread Next]
Most of the rationales for putting additional information on the drawings
are based on an attempt to prevent an often poorly defined problem that
will possibly occur some time in the future. These problems are problems
that we have no obligation to prevent and "solving"  them can have
consequences so why do we do it?

Construction documents are intended to give directions to the Contractor. 
It is my belief that documents are most effective when they try to do just
one thing.  When you try to accomplish multiple objectives, such as
facilitating future ill defined modifications, then things get  fuzzy. 
When we use construction documents to accomplish multiple objectives, we
spend more time and run the risk that we will increase our liability as a
result of confusing others.  

If you just tell the contractor to put a certain amount of reinforcing in a
block wall there is little confusion.  On the other hand if you define
something as a shear wall you might find the Contractor has wrongly used
this information to justify some interpretation you did not intend.  In
addition if there is litigation involving the building this additional
information and any alleged inconsistencies will be used against you if
possible.  Is it worth the grief?

The common practice of placing material properties on the drawings often
results in conflicts with the specifications.  Placing the material grades
and strengths on the drawings also encourages the contractor to get in the
habit of looking only on the drawings thus ignoring the additional
provisions in the specifications.  Is it worth the grief?

When you put additional information on the drawings it makes it easier for
another engineer to modify the building you designed.  On the other hand if
that information was not on the drawings the Owner might  find it cheaper
to have you design the modifications.  If you are dealing with somebody
elses design where certain additional information is not in the
construction documents you will probably have to spend more time thus
increasing your total fees.  Why should we spend more time doing something
that increses our liability exposure while likely having a negative impact
on future fees?

Thus I believe we should only include information in the construction
documents the Contractor needs to perform the current work.

Mark Gilligan

******* ****** ******* ******** ******* ******* ******* ***
*   Read list FAQ at:
*   This email was sent to you via Structural Engineers 
*   Association of Southern California (SEAOSC) server. To 
*   subscribe (no fee) or UnSubscribe, please go to:
*   Questions to seaint-ad(--nospam--at) Remember, any email you 
*   send to the list is public domain and may be re-posted 
*   without your permission. Make sure you visit our web 
*   site at: 
******* ****** ****** ****** ******* ****** ****** ********