HELP!!! I know that overhead doors create an obstrution over 4ft. wide when open therefore requiring sprinklers under the door or on the sidewalls that will cover the obstucted area when the door is open, but is there any such thing as a grand father rule for an existing structure? I am unaware of such a rule. Any help is appreciated.

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You would have to go and look at the year of construction or the year the door was installed and apply that particular years building code. If the door or building was constructed in 1998 go back to 1998 and she which year building code was valid. As an example I am in Canada and in 1998 the most recent building code would have been the 1995.
The best answer I know of is to look at the edition of the code that the building was constructed under and see if that requirement is in that edition. If so, then it applies. The requirement you refer to has been in the code for a good while, so if the building is not too old, it would be required.

Also, if you are using the 2009 of the International Fire Code, be sure to check the new chapter for existing buildings.
Thanks Guys, I will have to do some checking
Be sure to cross check both your locally adopted code (IFC?) and NFPA 13.
Well looks like the building was built in 1995 and my jursdiction was using the 1993 BOCA Code back then and so far haven't found any requirements yet so maybe this would be an exception to the code.
does the 1993 BOCA Code make any reference to NFPA 13?
Yes, but to NFiPA 13?
NFPA is the standard for instalation of sprinkler systems. So the building code would not make a specifc reference to if or if not heads are required. NFPA 13 would.
So I would need to check NFPA 13 for back then? If so, how do you do that? lol, I know I have alot of questions, lol. I've been an inspector for a few years now, just have never had to reference so far back.
yup you would have the look at the older nfpa, and the reference would not be spcific to overhead doors either it is just treated as an obstruction. I just look and the oldest I have is 1995
In the back of the code book (most cases) is a list of the referenced codes for that Code. Once you find that, then you would have to check that edition of NFPA 13 referenced in your adopted Code for that time frame that the building was constructed. THat is unless your jurisdiction adopted a different edition of NFPA 13. Otherwise, you would use the edition referenced by your adopted building/fire code.

Good luck. If you still need help, try to tell us what edition of what code was adopted by your jurisdiction when this building was constructed. I am sure all of us would be willing to help with a code analysis.
depending on what code standard you use you may also want to take a look at NFPA 25. That has some pretty specific statements about where sprinkler heads should be located. Also (again) depending on your
jurisidictions rules you can possibly use the rule that the AHJ can make certains requirements that they deem necessary.

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